App

UniProt ID: P12023
Organism: Mus musculus
Review Status: IN PROGRESS
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Gene Description

Amyloid-beta precursor protein (APP) is a type I transmembrane protein that undergoes complex proteolytic processing to generate multiple bioactive fragments with distinct biological functions. APP is a paradigm for regulated intramembrane proteolysis (RIP). The protein has both alternative splice isoforms (APP695/751/770 differing in presence of KPI domain) and undergoes proteolytic cleavage via two competing pathways: (1) non-amyloidogenic (alpha-secretase) producing neuroprotective sAPPalpha, and (2) amyloidogenic (beta-secretase/BACE1) producing Abeta peptides associated with Alzheimer's disease. Full-length APP functions as a cell adhesion molecule, regulates neurite outgrowth, synapse formation, and copper/zinc homeostasis. The AICD fragment functions in nuclear signaling. Key biological insight: sAPPalpha is NEUROPROTECTIVE while Abeta is NEUROTOXIC - antagonistic functions from the same gene product. CRITICAL: Many annotations conflate full-length APP, splice isoforms, and cleavage products.

Functional Isoforms

Curated functional classes representing distinct biological activities. These may be splice variants, cleavage products, or other forms with different functions.

APP695 (Neuronal) SPLICE CLASS
ID: APP_695_NEURONAL
UNIPROT ISOFORM: P12023-2
Brain-predominant isoform lacking the KPI (Kunitz protease inhibitor) domain encoded by exon 7. APP695 is the major isoform in neurons and is the primary substrate for amyloidogenic processing in the brain. Does NOT have serine protease inhibitor activity. The ratio of APP695 to KPI-containing isoforms decreases with aging and in Alzheimer's disease.
Isoform-specific terms: neuron projection development
APP751/770 (KPI-containing) SPLICE CLASS
ID: APP_KPI_CONTAINING
UNIPROT ISOFORM: P12023-1, P12023-3
Peripheral isoforms containing the KPI (Kunitz protease inhibitor) domain. APP770 (P12023-1) also has the OX-2 domain. These isoforms have serine protease inhibitor activity that APP695 lacks. Predominantly expressed in non-neuronal tissues. May regulate coagulation and inflammation.
Isoform-specific terms: serine-type endopeptidase inhibitor activity
sAPPalpha (Soluble APP-alpha) CLEAVAGE PRODUCT
ID: APP_SAPP_ALPHA
UNIPROT CHAIN: PRO_0000000115 (residues 18-687)
NEUROPROTECTIVE ectodomain released by alpha-secretase (ADAM10/17) cleavage. sAPPalpha promotes neurite outgrowth, synaptogenesis, and neuronal survival. Has 10-100x higher neurotrophic activity than sAPPbeta. The alpha-secretase pathway PRECLUDES Abeta generation - thus sAPPalpha represents the "non-amyloidogenic" pathway. Enhancing alpha-secretase is a therapeutic strategy for Alzheimer's disease.
Isoform-specific terms: negative regulation of neuron apoptotic process neuron projection development
sAPPbeta (Soluble APP-beta) CLEAVAGE PRODUCT
ID: APP_SAPP_BETA
UNIPROT CHAIN: PRO_0000000116 (residues 18-671)
Ectodomain released by beta-secretase (BACE1) cleavage. Unlike sAPPalpha, sAPPbeta has REDUCED neurotrophic activity and may promote apoptosis by binding to DR6 (death receptor 6). This is the first step of the AMYLOIDOGENIC pathway that leads to Abeta generation.
Amyloid-beta 42 (Abeta42) CLEAVAGE PRODUCT
ID: APP_ABETA42
UNIPROT CHAIN: PRO_0000000118 (residues 672-713)
NEUROTOXIC peptide - the pathogenic form in Alzheimer's disease. Abeta42 is more aggregation-prone than Abeta40 due to two additional hydrophobic C-terminal residues. Forms oligomers and fibrils that cause synaptic dysfunction, oxidative stress, and neuron death. The Abeta42/Abeta40 ratio is critical - increased ratio (even with normal total Abeta) causes familial AD. ANTAGONISTIC to sAPPalpha function - same gene produces both neuroprotective AND neurotoxic products depending on processing pathway.
Isoform-specific terms: positive regulation of neuron apoptotic process amyloid fibril formation
Amyloid-beta 40 (Abeta40) CLEAVAGE PRODUCT
ID: APP_ABETA40
UNIPROT CHAIN: PRO_0000000119 (residues 672-711)
Major Abeta species (90% of Abeta). Less aggregation-prone than Abeta42. May actually be protective by competing with Abeta42 for aggregation sites. The Abeta42/Abeta40 ratio is more predictive of AD than total Abeta levels.
Isoform-specific terms: amyloid fibril formation
AICD (APP Intracellular Domain) CLEAVAGE PRODUCT
ID: APP_AICD
UNIPROT CHAIN: PRO_0000000123, PRO_0000000124, PRO_0000000125 (residues 712-770 / 714-770 / 721-770)
Intracellular fragment released by gamma-secretase cleavage. AICD translocates to nucleus with Fe65 and Tip60, where it may act as a transcriptional regulator. Proposed targets include EGFR, p53, KAI1/CD82, GSK3B, and neprilysin. However, the transcription factor function of AICD remains CONTROVERSIAL - some studies suggest nuclear AICD is an artifact of overexpression. AICD is rapidly degraded by IDE (insulin-degrading enzyme).
N-APP (N-terminal fragment) CLEAVAGE PRODUCT
ID: APP_N_APP
UNIPROT CHAIN: PRO_0000381968 (residues 18-286)
N-terminal fragment that binds DR6 (death receptor 6, TNFRSF21) to trigger axon degeneration via caspase-6. Important for developmental axon pruning. May contribute to neurodegeneration in disease. Contains the growth factor and copper-binding domains.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0007409 axonogenesis
IBA
GO_REF:0000033 		ACCEPT
Summary: IBA annotation. Full-length APP regulates axon development. APP knockout mice show defects in axonogenesis. sAPPalpha promotes neurite outgrowth while full-length APP with Fe65/Mena inhibits branching to ensure directional growth (PMID:10188929, App-deep-research-perplexity.md).
Reason: Core biological process. Well-supported by knockout studies and mechanistic understanding.
Supporting Evidence:
file:mouse/App/App-deep-research-perplexity.md
provider: perplexity
GO:0007417 central nervous system development
IBA
GO_REF:0000033 		ACCEPT
Summary: Phylogenetic inference (IBA) from GO_REF:0000033. IBA annotations undergo extensive phylogenetic review and are generally reliable.
Reason: IBA annotation supported by phylogenetic analysis.
GO:0005769 early endosome
IBA
GO_REF:0000033 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005102 signaling receptor binding
IBA
GO_REF:0000033 		ACCEPT
Summary: Phylogenetic inference (IBA) from GO_REF:0000033. IBA annotations undergo extensive phylogenetic review and are generally reliable.
Reason: IBA annotation supported by phylogenetic analysis.
GO:0005886 plasma membrane
IBA
GO_REF:0000033 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0030546 signaling receptor activator activity
IBA
GO_REF:0000033 		ACCEPT
Summary: Abeta42 activates FPR2 (formyl peptide receptor 2), inducing chemotaxis and oxidant stress in phagocytes (PMID:11316806). Note: this is primarily an Abeta cleavage product function.
Reason: Supported by PMID:11316806, though applies to Abeta rather than full-length APP.
GO:0005794 Golgi apparatus
IBA
GO_REF:0000033 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0045121 membrane raft
IBA
GO_REF:0000033 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0009986 cell surface
IBA
GO_REF:0000033 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005790 smooth endoplasmic reticulum
IEA
GO_REF:0000108 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000108. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0050918 positive chemotaxis
IEA
GO_REF:0000108 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000108. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0004867 serine-type endopeptidase inhibitor activity
IEA
GO_REF:0000120 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000120. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0005576 extracellular region
IEA
GO_REF:0000044 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000044. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0005634 nucleus
IEA
GO_REF:0000044 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000044. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0005737 cytoplasm
IEA
GO_REF:0000044 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005769 early endosome
IEA
GO_REF:0000044 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005783 endoplasmic reticulum
IEA
GO_REF:0000044 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005794 Golgi apparatus
IEA
GO_REF:0000044 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005886 plasma membrane
IEA
GO_REF:0000044 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005905 clathrin-coated pit
IEA
GO_REF:0000120 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000120. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0006897 endocytosis
IEA
GO_REF:0000043 		ACCEPT
Summary: APP undergoes clathrin-mediated endocytosis via its YENPTY motif. APP also regulates NMDA receptor endocytosis through Abeta-mediated signaling (PMID:16025111, UniProt P12023).
Reason: Core function - APP endocytosis is essential for its processing and signaling.
GO:0006915 apoptotic process
IEA
GO_REF:0000043 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0007155 cell adhesion
IEA
GO_REF:0000043 		ACCEPT
Summary: APP functions as a cell adhesion molecule through homophilic and heterophilic interactions. Trans-synaptic APP dimerization mediates cell-cell adhesion (App-deep-research-perplexity.md).
Reason: Core function - APP is a bona fide cell adhesion molecule.
GO:0007219 Notch signaling pathway
IEA
GO_REF:0000043 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0008201 heparin binding
IEA
GO_REF:0000120 		ACCEPT
Summary: IBA annotation for heparin binding. APP contains two heparin-binding domains in E1 and E2 regions. High-affinity site in E1 GFLD and lower-affinity site in E2 (App-deep-research-perplexity.md).
Reason: Core molecular function. Heparin binding mediates APP interactions with ECM and affects processing.
GO:0009986 cell surface
IEA
GO_REF:0000120 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0010604 positive regulation of macromolecule metabolic process
IEA
GO_REF:0000117 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0012505 endomembrane system
IEA
GO_REF:0000117 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0016020 membrane
IEA
GO_REF:0000120 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0030198 extracellular matrix organization
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: IBA annotation. APP interacts with ECM components (heparin, collagen, laminin) and may influence ECM organization. However, this is a secondary consequence of APP cell adhesion functions rather than core function (App-deep-research-perplexity.md).
Reason: Downstream effect of APP cell adhesion and heparin-binding activities.
GO:0030414 peptidase inhibitor activity
IEA
GO_REF:0000043 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0030426 growth cone
IEA
GO_REF:0000044 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0031410 cytoplasmic vesicle
IEA
GO_REF:0000120 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0043005 neuron projection
IEA
GO_REF:0000117 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0043204 perikaryon
IEA
GO_REF:0000044 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000044. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0046872 metal ion binding
IEA
GO_REF:0000043 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0046914 transition metal ion binding
IEA
GO_REF:0000002 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000002. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0051246 regulation of protein metabolic process
IEA
GO_REF:0000117 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0099503 secretory vesicle
IEA
GO_REF:0000117 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0140677 molecular function activator activity
IEA
GO_REF:0000117 		ACCEPT
Summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent with APP biology and supported by computational inference.
Reason: IEA annotation consistent with known APP functions.
GO:0005515 protein binding
IPI
PMID:10460257
Disabled-1 binds to the cytoplasmic domain of amyloid precur... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:10460257
Disabled-1 binds to the cytoplasmic domain of amyloid precursor-like protein 1.
GO:0005515 protein binding
IPI
PMID:11517249
c-Jun N-terminal kinase (JNK)-interacting protein-1b/islet-b... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:11517249
c-Jun N-terminal kinase (JNK)-interacting protein-1b/islet-brain-1 scaffolds Alzheimer's amyloid precursor protein with JNK.
GO:0005515 protein binding
IPI
PMID:11724784
Jun NH2-terminal kinase (JNK) interacting protein 1 (JIP1) b... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:11724784
Nov 27. Jun NH2-terminal kinase (JNK) interacting protein 1 (JIP1) binds the cytoplasmic domain of the Alzheimer's beta-amyloid precursor protein (APP).
GO:0005515 protein binding
IPI
PMID:11877420
Tyrosine phosphorylation of the beta-amyloid precursor prote... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:11877420
2002 Mar 4. Tyrosine phosphorylation of the beta-amyloid precursor protein cytoplasmic tail promotes interaction with Shc.
GO:0005515 protein binding
IPI
PMID:12826668
Crystal structures of the Dab homology domains of mouse disa... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:12826668
2003 Jun 24. Crystal structures of the Dab homology domains of mouse disabled 1 and 2.
GO:0005515 protein binding
IPI
PMID:16193067
Homo- and heterodimerization of APP family members promotes ... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:16193067
Sep 29. Homo- and heterodimerization of APP family members promotes intercellular adhesion.
GO:0005515 protein binding
IPI
PMID:16407538
Interaction of the cytosolic domains of sorLA/LR11 with the ... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:16407538
Interaction of the cytosolic domains of sorLA/LR11 with the amyloid precursor protein (APP) and beta-secretase beta-site APP-cleaving enzyme.
GO:0005515 protein binding
IPI
PMID:17934213
The in vivo brain interactome of the amyloid precursor prote... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:17934213
Epub 2007 Oct 13. The in vivo brain interactome of the amyloid precursor protein.
GO:0005515 protein binding
IPI
PMID:20573181
Progressive accumulation of amyloid-beta oligomers in Alzhei... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:20573181
2010 Jun 22. Progressive accumulation of amyloid-beta oligomers in Alzheimer's disease and in amyloid precursor protein transgenic mice is accompanied by selective alterations in synaptic scaffold proteins.
GO:0005515 protein binding
IPI
PMID:20817278
Iron-export ferroxidase activity of β-amyloid precursor prot... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:20817278
Iron-export ferroxidase activity of β-amyloid precursor protein is inhibited by zinc in Alzheimer's disease.
GO:0005515 protein binding
IPI
PMID:20925061
Molecular characterization of a trafficking organelle: disse... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:20925061
Molecular characterization of a trafficking organelle: dissecting the axonal paths of calsyntenin-1 transport vesicles.
GO:0005515 protein binding
IPI
PMID:21368882
TGF-β induces TIAF1 self-aggregation via type II receptor-in... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:21368882
TGF-β induces TIAF1 self-aggregation via type II receptor-independent signaling that leads to generation of amyloid β plaques in Alzheimer's disease.
GO:0005515 protein binding
IPI
PMID:23283322
Sortilin and SorLA display distinct roles in processing and ... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:23283322
Sortilin and SorLA display distinct roles in processing and trafficking of amyloid precursor protein.
GO:0005515 protein binding
IPI
PMID:23585889
Generation of amyloid-β is reduced by the interaction of cal... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:23585889
Generation of amyloid-β is reduced by the interaction of calreticulin with amyloid precursor protein, presenilin and nicastrin.
GO:0005515 protein binding
IPI
PMID:23719799
A tetra(ethylene glycol) derivative of benzothiazole aniline... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:23719799
A tetra(ethylene glycol) derivative of benzothiazole aniline enhances Ras-mediated spinogenesis.
GO:0005515 protein binding
IPI
PMID:26960425
Yeast Two-Hybrid Screening for Proteins that Interact with t... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:26960425
Mar 9. Yeast Two-Hybrid Screening for Proteins that Interact with the Extracellular Domain of Amyloid Precursor Protein.
GO:0005515 protein binding
IPI
PMID:19242475
Cellular prion protein mediates impairment of synaptic plast... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:19242475
Cellular prion protein mediates impairment of synaptic plasticity by amyloid-beta oligomers.
GO:0005515 protein binding
IPI
PMID:20133875
Synthetic amyloid-beta oligomers impair long-term memory ind... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:20133875
Synthetic amyloid-beta oligomers impair long-term memory independently of cellular prion protein.
GO:0005515 protein binding
IPI
PMID:21113149
Reversing EphB2 depletion rescues cognitive functions in Alz... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:21113149
Reversing EphB2 depletion rescues cognitive functions in Alzheimer model.
GO:0000122 negative regulation of transcription by RNA polymerase II
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0001664 G protein-coupled receptor binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0001774 microglial cell activation
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0001878 response to yeast
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0002265 astrocyte activation involved in immune response
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0003682 chromatin binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0004867 serine-type endopeptidase inhibitor activity
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005102 signaling receptor binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005109 frizzled binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005158 insulin receptor binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005178 integrin binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005615 extracellular space
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005634 nucleus
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005641 nuclear envelope lumen
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005737 cytoplasm
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005739 mitochondrion
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005764 lysosome
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005768 endosome
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005769 early endosome
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005783 endoplasmic reticulum
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005794 Golgi apparatus
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005886 plasma membrane
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0006357 regulation of transcription by RNA polymerase II
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0007186 G protein-coupled receptor signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0007189 adenylate cyclase-activating G protein-coupled receptor signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0007193 adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0007611 learning or memory
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0007612 learning
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0007613 memory
ISO
GO_REF:0000119 		ACCEPT
Summary: APP is required for normal memory. APP knockout mice show age-related cognitive deficits. sAPPalpha and picomolar Abeta enhance memory while Abeta oligomers impair memory (PMID:10188929, PMID:19118188, PMID:18568035).
Reason: Core function supported by behavioral studies in knockout mice.
GO:0008285 negative regulation of cell population proliferation
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0008306 associative learning
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0009986 cell surface
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0010468 regulation of gene expression
ISO
GO_REF:0000119 		ACCEPT
Summary: AICD functions as transcriptional regulator via Fe65-Tip60 complex. Regulates genes involved in neurogenesis, apoptosis, and Abeta metabolism (PMID:12074840, App-deep-research-perplexity.md).
Reason: Core AICD function.
GO:0010628 positive regulation of gene expression
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0010629 negative regulation of gene expression
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0014005 microglia development
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0019722 calcium-mediated signaling
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0019731 antibacterial humoral response
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial activity against bacteria. However, this is specifically an Abeta function, not full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0019732 antifungal humoral response
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta has antifungal activity. However, this is specifically an Abeta function, not full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0019899 enzyme binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0030178 negative regulation of Wnt signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0030425 dendrite
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0030546 signaling receptor activator activity
ISO
GO_REF:0000119 		ACCEPT
Summary: Abeta42 activates FPR2 (formyl peptide receptor 2), inducing chemotaxis and oxidant stress in phagocytes (PMID:11316806). Note: this is primarily an Abeta cleavage product function.
Reason: Supported by PMID:11316806, though applies to Abeta rather than full-length APP.
GO:0031583 phospholipase D-activating G protein-coupled receptor signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0031901 early endosome membrane
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032224 positive regulation of synaptic transmission, cholinergic
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032722 positive regulation of chemokine production
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032729 positive regulation of type II interferon production
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032731 positive regulation of interleukin-1 beta production
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032755 positive regulation of interleukin-6 production
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032760 positive regulation of tumor necrosis factor production
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta promotes TNF production via RAGE-mediated pathway (PMID:12808450). This is an Abeta-specific function, not intrinsic to full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0032930 positive regulation of superoxide anion generation
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0032991 protein-containing complex
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0033130 acetylcholine receptor binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0034121 regulation of toll-like receptor signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0034185 apolipoprotein binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0034361 very-low-density lipoprotein particle
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0034362 low-density lipoprotein particle
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0034363 intermediate-density lipoprotein particle
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0034364 high-density lipoprotein particle
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0042056 chemoattractant activity
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0042802 identical protein binding
ISO
GO_REF:0000119 		ACCEPT
Summary: APP forms homodimers through E1 domain interactions. Dimerization is enhanced by copper binding and heparin. Trans-dimerization mediates cell-cell adhesion at synapses (PMID:16193067, App-deep-research-perplexity.md).
Reason: Core molecular function - APP dimerization is functionally important for synaptic adhesion.
GO:0042803 protein homodimerization activity
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0043005 neuron projection
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0043065 positive regulation of apoptotic process
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0043395 heparan sulfate proteoglycan binding
ISO
GO_REF:0000119 		ACCEPT
Summary: APP binds heparan sulfate proteoglycans including GPC1 via its heparin-binding domains. This interaction affects APP processing and copper delivery to GPC1 (UniProt P12023).
Reason: Supported by APP heparin-binding domain structure and HSPG interactions.
GO:0043410 positive regulation of MAPK cascade
ISO
GO_REF:0000119 		ACCEPT
Summary: APP promotes MAPK activation. APP-NCAM interaction activates ERK1/2. sAPPalpha activates MAPK signaling for neuroprotection (App-deep-research-perplexity.md).
Reason: Core signaling function supported by mechanistic evidence.
GO:0043525 positive regulation of neuron apoptotic process
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta oligomers and C31/AICD fragments promote neuronal apoptosis. However, sAPPalpha is NEUROPROTECTIVE. Full-length APP has complex, context-dependent effects on survival. This annotation represents only the pro-apoptotic Abeta/AICD side (UniProt P12023, App-deep-research-perplexity.md).
Reason: Over-annotation - conflates opposing effects of different APP products. sAPPalpha is protective.
GO:0044297 cell body
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0045087 innate immune response
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial properties and activates innate immune responses. While interesting, this is primarily an Abeta function rather than full-length APP function.
Reason: Over-annotation - primarily Abeta function.
GO:0045121 membrane raft
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0045429 positive regulation of nitric oxide biosynthetic process
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0045666 positive regulation of neuron differentiation
ISO
GO_REF:0000119 		ACCEPT
Summary: sAPPalpha and Abeta at low concentrations promote neural stem cell proliferation and neuron differentiation (PMID:15190117, App-deep-research-perplexity.md).
Reason: Supported by experimental evidence showing neurogenic effects of APP products.
GO:0045745 positive regulation of G protein-coupled receptor signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0045752 positive regulation of Toll signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0045821 positive regulation of glycolytic process
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0045944 positive regulation of transcription by RNA polymerase II
ISO
GO_REF:0000119 		ACCEPT
Summary: AICD-Fe65-Tip60 complex activates transcription of target genes including neprilysin (PMID:15944124, App-deep-research-perplexity.md).
Reason: Core AICD signaling function supported by mechanistic evidence.
GO:0046330 positive regulation of JNK cascade
ISO
GO_REF:0000119 		ACCEPT
Summary: APP intracellular domain interacts with JIP1 (MAPK8IP1), which scaffolds JNK signaling (PMID:11517249, PMID:11724784).
Reason: Supported by documented APP-JIP1 interaction.
GO:0046875 ephrin receptor binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Abeta42 interacts with EphB2 receptor. This interaction may contribute to synaptic dysfunction in AD (IntAct: EBI-14022231).
Reason: Supported by protein interaction data.
GO:0046982 protein heterodimerization activity
ISO
GO_REF:0000119 		ACCEPT
Summary: APP heterodimerizes with APLP1 and APLP2. These interactions contribute to functional redundancy among APP family members (IntAct data, App-deep-research-perplexity.md).
Reason: Core function - APP family heterodimerization is functionally important.
GO:0048018 receptor ligand activity
ISO
GO_REF:0000119 		ACCEPT
Summary: sAPPalpha and N-APP fragments function as ligands for receptors. sAPPalpha may act through neurotrophin receptors. N-APP binds DR6 for axon pruning signaling (App-deep-research-perplexity.md).
Reason: Supported by evidence for APP fragments functioning as signaling ligands.
GO:0048143 astrocyte activation
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta activates astrocytes. Reactive gliosis is seen in APP knockout mice but also with Abeta accumulation. Complex relationship between APP and astrocyte activation.
Reason: Over-annotation - primarily Abeta-mediated effect.
GO:0048169 regulation of long-term neuronal synaptic plasticity
ISO
GO_REF:0000119 		ACCEPT
Summary: APP regulates LTP and LTD. APP knockout impairs LTP. sAPPalpha enhances LTP while Abeta oligomers inhibit LTP and enhance LTD (PMID:18568035, PMID:19118188, App-deep-research-perplexity.md).
Reason: Core function - central to APP physiology and Alzheimer's pathology.
GO:0048471 perinuclear region of cytoplasm
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0050729 positive regulation of inflammatory response
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta peptides activate inflammatory responses in microglia and astrocytes. This is primarily an Abeta cleavage product function, not intrinsic to full-length APP (App-deep-research-perplexity.md).
Reason: Over-annotation - specifically Abeta function, not full-length APP.
GO:0050786 RAGE receptor binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Abeta binds RAGE (AGER), mediating Abeta transport across blood-brain barrier and neuroinflammatory responses. Note: primarily Abeta function (App-deep-research-perplexity.md).
Reason: Well-documented Abeta-RAGE interaction with pathological significance.
GO:0050808 synapse organization
ISO
GO_REF:0000119 		ACCEPT
Summary: APP is essential for synapse formation and maintenance. Trans-synaptic APP dimerization promotes synaptogenesis. APP knockout mice show synaptic deficits (PMID:10188929, App-deep-research-perplexity.md).
Reason: Core biological function supported by knockout phenotypes and mechanistic studies.
GO:0050829 defense response to Gram-negative bacterium
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial properties. This is specifically an Abeta cleavage product function.
Reason: Over-annotation - specifically Abeta function.
GO:0050830 defense response to Gram-positive bacterium
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial properties. This is specifically an Abeta cleavage product function.
Reason: Over-annotation - specifically Abeta function.
GO:0050850 positive regulation of calcium-mediated signaling
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0051044 positive regulation of membrane protein ectodomain proteolysis
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0051087 protein-folding chaperone binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0051247 positive regulation of protein metabolic process
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0051260 protein homooligomerization
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0051262 protein tetramerization
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0051425 PTB domain binding
ISO
GO_REF:0000119 		ACCEPT
Summary: APP cytoplasmic tail contains YENPTY motif that binds PTB domain proteins including Fe65, X11/Mint, Dab1, Numb, and others. This is a core mechanism for APP intracellular signaling (UniProt P12023, App-deep-research-perplexity.md).
Reason: Core molecular function - YENPTY motif is essential for APP signaling.
GO:0051580 regulation of neurotransmitter uptake
ISO
GO_REF:0000119 		ACCEPT
Summary: APP regulates glutamate uptake. Presenilin-1 and APP affect neuronal glutamate transporter function (PMID:15009636).
Reason: Supported by experimental evidence.
GO:0055096 low-density lipoprotein particle mediated signaling
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0061844 antimicrobial humoral immune response mediated by antimicrobial peptide
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta functions as antimicrobial peptide. This is specifically Abeta function, not full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0070206 protein trimerization
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0070374 positive regulation of ERK1 and ERK2 cascade
ISO
GO_REF:0000119 		ACCEPT
Summary: APP activates ERK1/2 through NCAM1 interaction and other mechanisms. Important for neurite outgrowth signaling (App-deep-research-perplexity.md).
Reason: Supported by mechanistic studies.
GO:0070381 endosome to plasma membrane transport vesicle
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0090026 positive regulation of monocyte chemotaxis
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0090090 negative regulation of canonical Wnt signaling pathway
ISO
GO_REF:0000119 		UNDECIDED
Summary: APP has been reported to interact with Wnt signaling, but the direction of regulation is complex. APP may function as a Wnt receptor (E1 domain binds Wnt3a/Wnt5a) rather than purely inhibiting Wnt signaling.
Reason: Evidence is complex - APP may both activate and modulate Wnt pathways.
GO:0098793 presynapse
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0098794 postsynapse
ISO
GO_REF:0000119 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0098815 modulation of excitatory postsynaptic potential
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0106003 amyloid-beta complex
ISO
GO_REF:0000119 		ACCEPT
Summary: Abeta peptides derived from APP form oligomeric and fibrillar complexes. This is a characteristic property of Abeta cleavage products.
Reason: Accurate localization for Abeta products.
GO:0120283 protein serine/threonine kinase binding
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0141137 positive regulation of gene expression, epigenetic
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0141163 positive regulation of cAMP/PKA signal transduction
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0150003 regulation of spontaneous synaptic transmission
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1900181 negative regulation of protein localization to nucleus
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1900221 regulation of amyloid-beta clearance
ISO
GO_REF:0000119 		ACCEPT
Summary: APP and its interactions with LRP1 and other receptors affect Abeta clearance across the blood-brain barrier (App-deep-research-perplexity.md).
Reason: Supported by evidence for APP role in Abeta metabolism.
GO:1900272 negative regulation of long-term synaptic potentiation
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta oligomers inhibit LTP (PMID:18568035, PMID:19242475). However, this is specifically an Abeta function, not full-length APP. sAPPalpha actually ENHANCES LTP. Annotation conflates opposing functions of different APP products.
Reason: Over-annotation - specifically Abeta oligomer function. Full-length APP/sAPPalpha have opposite effect.
GO:1900273 positive regulation of long-term synaptic potentiation
ISO
GO_REF:0000119 		ACCEPT
Summary: sAPPalpha enhances LTP. Picomolar Abeta also positively modulates LTP, while high concentrations inhibit it (PMID:19118188). Full-length APP is required for normal LTP (App-deep-research-perplexity.md).
Reason: Supported by evidence for sAPPalpha and low-concentration Abeta effects.
GO:1900454 positive regulation of long-term synaptic depression
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta oligomers enhance LTD via mGluR-dependent mechanism (PMID:18568035, PMID:19242475). This is specifically an Abeta oligomer function, not a property of full-length APP.
Reason: Over-annotation - specifically Abeta oligomer function, not full-length APP.
GO:1901224 positive regulation of non-canonical NF-kappaB signal transduction
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1902894 negative regulation of miRNA transcription
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1902950 regulation of dendritic spine maintenance
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1902951 negative regulation of dendritic spine maintenance
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1902993 positive regulation of amyloid precursor protein catabolic process
ISO
GO_REF:0000119 		ACCEPT
Summary: Accurate annotation - APP is subject to regulated catabolism by secretases and degradation machinery.
Reason: Core biology of APP processing.
GO:1903381 regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1903523 negative regulation of blood circulation
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta affects vascular function including endothelin production and blood-brain barrier transport (PMID:12808450). This is primarily Abeta pathophysiology, not full-length APP function.
Reason: Over-annotation - specifically Abeta-mediated vascular effects.
GO:1904022 positive regulation of G protein-coupled receptor internalization
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1904472 positive regulation of endothelin production
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta via RAGE increases endothelin production (PMID:12808450). This is Abeta pathophysiology, not intrinsic APP function.
Reason: Over-annotation - specifically Abeta function.
GO:1904591 positive regulation of protein import
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1904646 cellular response to amyloid-beta
ISO
GO_REF:0000119 		ACCEPT
Summary: Cells respond to Abeta through multiple receptors including RAGE, FPR2, PrP. This annotation acknowledges APP as the Abeta source.
Reason: Accurate - reflects Abeta signaling biology.
GO:1905606 regulation of presynapse assembly
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1905898 positive regulation of response to endoplasmic reticulum stress
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1905906 regulation of amyloid fibril formation
ISO
GO_REF:0000119 		ACCEPT
Summary: APP processing pathways regulate amyloid fibril formation. Copper/zinc binding affects Abeta aggregation properties.
Reason: Accurate - APP and its processing regulate amyloid formation.
GO:1905908 positive regulation of amyloid fibril formation
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: While Abeta forms amyloid fibrils, full-length APP does not intrinsically promote fibril formation. Copper binding to APP actually reduces Abeta production.
Reason: Misleading - suggests APP promotes its own pathological processing.
GO:1990000 amyloid fibril formation
ISO
GO_REF:0000119 		ACCEPT
Summary: APP is the precursor to Abeta which forms amyloid fibrils. This is a well-characterized property of the Abeta cleavage product (App-deep-research-perplexity.md).
Reason: Accurate annotation - APP is the source of amyloid-forming Abeta.
GO:1990535 neuron projection maintenance
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1990777 lipoprotein particle
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:2000406 positive regulation of T cell migration
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:2000463 positive regulation of excitatory postsynaptic potential
ISO
GO_REF:0000119 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:2001238 positive regulation of extrinsic apoptotic signaling pathway
ISO
GO_REF:0000119 		MARK AS OVER ANNOTATED
Summary: Abeta and C-terminal fragments can activate extrinsic apoptotic pathways. However, sAPPalpha is neuroprotective. This annotation misrepresents the full biology of APP (App-deep-research-perplexity.md).
Reason: Over-annotation - does not reflect neuroprotective sAPPalpha functions.
GO:0043408 regulation of MAPK cascade
ISO
GO_REF:0000096 		ACCEPT
Summary: APP activates MAPK cascade through multiple mechanisms including interaction with NCAM1 and Ras signaling (PMID:15190117, App-deep-research-perplexity.md).
Reason: Supported by experimental evidence for APP-mediated MAPK activation.
GO:1902951 negative regulation of dendritic spine maintenance
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0008270 zinc ion binding
ISO
GO_REF:0000096 		ACCEPT
Summary: APP binds zinc via residues in the copper binding site (His457, His507, His511). Zinc binding regulates APP processing and affects Abeta aggregation (UniProt P12023, App-deep-research-perplexity.md).
Reason: Core molecular function supported by structural and biochemical evidence.
GO:0001878 response to yeast
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005615 extracellular space
ISO
GO_REF:0000096 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0005737 cytoplasm
ISO
GO_REF:0000096 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0006816 calcium ion transport
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0009986 cell surface
ISO
GO_REF:0000096 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0016504 peptidase activator activity
ISO
GO_REF:0000096 		MODIFY
Summary: IBA annotation for serine-type endopeptidase inhibitor activity. ONLY applies to APP751/770 isoforms containing KPI (Kunitz protease inhibitor) domain. APP695 (neuronal isoform) lacks this domain (UniProt P12023).
Reason: Isoform-specific function - only APP751/APP770 have KPI domain. Should be annotated with isoform qualifier.
GO:0019731 antibacterial humoral response
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial activity against bacteria. However, this is specifically an Abeta function, not full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0019732 antifungal humoral response
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Abeta has antifungal activity. However, this is specifically an Abeta function, not full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0030424 axon
ISO
GO_REF:0000096 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0030426 growth cone
ISO
GO_REF:0000096 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0044304 main axon
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0045087 innate immune response
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial properties and activates innate immune responses. While interesting, this is primarily an Abeta function rather than full-length APP function.
Reason: Over-annotation - primarily Abeta function.
GO:0050829 defense response to Gram-negative bacterium
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial properties. This is specifically an Abeta cleavage product function.
Reason: Over-annotation - specifically Abeta function.
GO:0050830 defense response to Gram-positive bacterium
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Abeta has antimicrobial properties. This is specifically an Abeta cleavage product function.
Reason: Over-annotation - specifically Abeta function.
GO:0051247 positive regulation of protein metabolic process
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0061844 antimicrobial humoral immune response mediated by antimicrobial peptide
ISO
GO_REF:0000096 		MARK AS OVER ANNOTATED
Summary: Abeta functions as antimicrobial peptide. This is specifically Abeta function, not full-length APP.
Reason: Over-annotation - specifically Abeta function.
GO:0070374 positive regulation of ERK1 and ERK2 cascade
ISO
GO_REF:0000096 		ACCEPT
Summary: APP activates ERK1/2 through NCAM1 interaction and other mechanisms. Important for neurite outgrowth signaling (App-deep-research-perplexity.md).
Reason: Supported by mechanistic studies.
GO:0070555 response to interleukin-1
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0070851 growth factor receptor binding
ISO
GO_REF:0000096 		ACCEPT
Summary: APP E1 domain has growth factor-like structure and APP interacts with growth factor receptors. APP-NCAM1 interaction activates MAPK pathway (App-deep-research-perplexity.md).
Reason: Supported by structural similarity and receptor interactions.
GO:0071874 cellular response to norepinephrine stimulus
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0097449 astrocyte projection
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0098992 neuronal dense core vesicle
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0110088 hippocampal neuron apoptotic process
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1905945 regulation of response to calcium ion
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1990761 growth cone lamellipodium
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:1990812 growth cone filopodium
ISO
GO_REF:0000096 		ACCEPT
Summary: Sequence orthology annotation (ISO) based on human APP. APP is highly conserved between mouse and human with similar functions.
Reason: ISO annotation supported by sequence conservation and functional similarity between mouse and human APP.
GO:0005515 protein binding
IPI
PMID:24305806
Pharmacologic inhibition of ROCK2 suppresses amyloid-β produ... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:24305806
Pharmacologic inhibition of ROCK2 suppresses amyloid-β production in an Alzheimer's disease mouse model.
GO:0005615 extracellular space
NAS
PMID:18568035
Amyloid-beta protein dimers isolated directly from Alzheimer... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:18568035
We extracted soluble amyloid-beta protein (Abeta) oligomers directly from the cerebral cortex of subjects with Alzheimer's disease
GO:0005886 plasma membrane
NAS
PMID:18568035
Amyloid-beta protein dimers isolated directly from Alzheimer... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:18568035
reduced dendritic spine density in normal rodent hippocampus
GO:0043408 regulation of MAPK cascade
ISS
GO_REF:0000114 		ACCEPT
Summary: APP activates MAPK cascade through multiple mechanisms including interaction with NCAM1 and Ras signaling (PMID:15190117, App-deep-research-perplexity.md).
Reason: Supported by experimental evidence for APP-mediated MAPK activation.
GO:0043408 regulation of MAPK cascade
IDA
PMID:15190117
Neurogenic effect of beta-amyloid peptide in the development... 		ACCEPT
Summary: APP activates MAPK cascade through multiple mechanisms including interaction with NCAM1 and Ras signaling (PMID:15190117, App-deep-research-perplexity.md).
Reason: Supported by experimental evidence for APP-mediated MAPK activation.
Supporting Evidence:
PMID:15190117
Neurogenic effect of beta-amyloid peptide in the development of neural stem cells.
GO:0045666 positive regulation of neuron differentiation
IDA
PMID:15190117
Neurogenic effect of beta-amyloid peptide in the development... 		ACCEPT
Summary: sAPPalpha and Abeta at low concentrations promote neural stem cell proliferation and neuron differentiation (PMID:15190117, App-deep-research-perplexity.md).
Reason: Supported by experimental evidence showing neurogenic effects of APP products.
Supporting Evidence:
PMID:15190117
Neurogenic effect of beta-amyloid peptide in the development of neural stem cells.
GO:1900272 negative regulation of long-term synaptic potentiation
IDA
PMID:18568035
Amyloid-beta protein dimers isolated directly from Alzheimer... 		MARK AS OVER ANNOTATED
Summary: Abeta oligomers inhibit LTP (PMID:18568035, PMID:19242475). However, this is specifically an Abeta function, not full-length APP. sAPPalpha actually ENHANCES LTP. Annotation conflates opposing functions of different APP products.
Reason: Over-annotation - specifically Abeta oligomer function. Full-length APP/sAPPalpha have opposite effect.
Supporting Evidence:
PMID:18568035
The oligomers potently inhibited long-term potentiation (LTP), enhanced long-term depression (LTD) and reduced dendritic spine density in normal rodent hippocampus
GO:1900272 negative regulation of long-term synaptic potentiation
NAS
PMID:19242475
Cellular prion protein mediates impairment of synaptic plast... 		MARK AS OVER ANNOTATED
Summary: Abeta oligomers inhibit LTP (PMID:18568035, PMID:19242475). However, this is specifically an Abeta function, not full-length APP. sAPPalpha actually ENHANCES LTP. Annotation conflates opposing functions of different APP products.
Reason: Over-annotation - specifically Abeta oligomer function. Full-length APP/sAPPalpha have opposite effect.
Supporting Evidence:
PMID:19242475
At nanomolar concentrations, soluble amyloid-beta oligomers block hippocampal long-term potentiation, cause dendritic spine retraction from pyramidal cells and impair rodent spatial memory
GO:1900454 positive regulation of long-term synaptic depression
NAS
PMID:19242475
Cellular prion protein mediates impairment of synaptic plast... 		MARK AS OVER ANNOTATED
Summary: Abeta oligomers enhance LTD via mGluR-dependent mechanism (PMID:18568035, PMID:19242475). This is specifically an Abeta oligomer function, not a property of full-length APP.
Reason: Over-annotation - specifically Abeta oligomer function, not full-length APP.
Supporting Evidence:
PMID:18568035
enhanced long-term depression (LTD)
PMID:19242475
Cellular prion protein mediates impairment of synaptic plasticity by amyloid-beta oligomers.
GO:1902951 negative regulation of dendritic spine maintenance
NAS
PMID:22820466
Alzheimer amyloid-β oligomer bound to postsynaptic prion pro... 		ACCEPT
Summary: Annotation (NAS) from PMID:22820466. Consistent with APP biology.
Reason: Annotation with evidence code NAS.
Supporting Evidence:
PMID:22820466
Aβ-induced dendritic spine loss and lactate dehydrogenase release required both PrP(C) and Fyn
GO:0005515 protein binding
IPI
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal trafficking to amyloidogenic processing.
GO:0009986 cell surface
IDA
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:30902970
Complex formation with GBRs stabilizes APP at the cell surface and reduces proteolysis of APP to Aβ
GO:0010467 gene expression
IMP
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		ACCEPT
Summary: AICD regulates gene expression through transcriptional and translational mechanisms. AICD can regulate p53 translation via IRES binding (PMID:30902970, App-deep-research-perplexity.md).
Reason: Supported by evidence for AICD transcriptional and translational regulation.
Supporting Evidence:
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal trafficking to amyloidogenic processing.
GO:0019904 protein domain specific binding
IDA
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		ACCEPT
Summary: APP binds to the sushi-domain of GABA(B) receptors with nanomolar affinity. Dinamarca et al. (2019) demonstrated domain-specific binding.
Reason: Experimental annotation (IDA) with literature support.
Supporting Evidence:
PMID:30902970
sequence-related epitopes in APP, AJAP-1 and PIANP bind with nanomolar affinities to the N-terminal sushi-domain of presynaptic GBRs
GO:0030424 axon
IMP
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		ACCEPT
Summary: APP loss impairs axonal GBR expression. Dinamarca et al. (2019) showed APP regulates axonal trafficking of GABA(B) receptors.
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:30902970
selectively the genetic loss of APP impaired GBR-mediated presynaptic inhibition and axonal GBR expression
GO:0097708 intracellular vesicle
IDA
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		ACCEPT
Summary: APP associates with cargo vesicles for axonal transport. Dinamarca et al. (2019) showed APP/GBR complex in cargo vesicles linked to trafficking motor.
Reason: Experimental annotation (IDA) with literature support.
Supporting Evidence:
PMID:30902970
APP associates with JIP and calsyntenin proteins that link the APP/GBR complex in cargo vesicles to the axonal trafficking motor
GO:1905607 negative regulation of presynapse assembly
IMP
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal... 		ACCEPT
Summary: APP loss impairs presynaptic GBR function. Dinamarca et al. (2019) showed APP is required for presynaptic inhibition via GBR.
Reason: Experimental annotation (IMP) with literature support.
Supporting Evidence:
PMID:30902970
selectively the genetic loss of APP impaired GBR-mediated presynaptic inhibition and axonal GBR expression
GO:0048786 presynaptic active zone
IEP
PMID:23815291
Amyloid precursor proteins are constituents of the presynapt... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:23815291
Amyloid precursor proteins are constituents of the presynaptic active zone.
GO:0048786 presynaptic active zone
IDA
PMID:23815291
Amyloid precursor proteins are constituents of the presynapt... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:23815291
Amyloid precursor proteins are constituents of the presynaptic active zone.
GO:0019901 protein kinase binding
IPI
PMID:24305806
Pharmacologic inhibition of ROCK2 suppresses amyloid-β produ... 		ACCEPT
Summary: APP cytoplasmic domain interacts with multiple kinases including CDK5, GSK3beta. APP is phosphorylated at multiple sites affecting its trafficking and processing (PMID:24305806, UniProt P12023).
Reason: Supported by documented kinase interactions and phosphorylation sites.
Supporting Evidence:
PMID:24305806
Pharmacologic inhibition of ROCK2 suppresses amyloid-β production in an Alzheimer's disease mouse model.
GO:0005515 protein binding
IPI
PMID:18650440
Structure of the C-terminal phosphotyrosine interaction doma... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:18650440
2008 Jul 23. Structure of the C-terminal phosphotyrosine interaction domain of Fe65L1 complexed with the cytoplasmic tail of amyloid precursor protein reveals a novel peptide binding mode.
GO:0005783 endoplasmic reticulum
ISS
GO_REF:0000024 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
GO:0030198 extracellular matrix organization
IGI
PMID:15385965
Cortical dysplasia resembling human type 2 lissencephaly in ... 		KEEP AS NON CORE
Summary: IBA annotation. APP interacts with ECM components (heparin, collagen, laminin) and may influence ECM organization. However, this is a secondary consequence of APP cell adhesion functions rather than core function (App-deep-research-perplexity.md).
Reason: Downstream effect of APP cell adhesion and heparin-binding activities.
Supporting Evidence:
PMID:15385965
Sep 23. Cortical dysplasia resembling human type 2 lissencephaly in mice lacking all three APP family members.
GO:0030900 forebrain development
IGI
PMID:15385965
Cortical dysplasia resembling human type 2 lissencephaly in ... 		ACCEPT
Summary: APP family is essential for forebrain development. Triple knockout (APP/APLP1/APLP2) mice show cortical dysplasia resembling type 2 lissencephaly (PMID:15385965, PMID:10200318).
Reason: Core developmental function demonstrated by knockout phenotypes.
Supporting Evidence:
PMID:15385965
Sep 23. Cortical dysplasia resembling human type 2 lissencephaly in mice lacking all three APP family members.
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding
IDA
PMID:15944124
Presenilin-dependent transcriptional control of the Abeta-de... 		UNDECIDED
Summary: PMID:15944124 shows AICD-Fe65-Tip60 complex regulates transcription, but AICD does not directly bind DNA in a sequence-specific manner. The complex is recruited via Fe65.
Reason: Questionable - AICD acts as transcriptional activator but may not directly bind DNA.
Supporting Evidence:
PMID:15944124
Presenilin-dependent transcriptional control of the Abeta-degrading enzyme neprilysin by intracellular domains of betaAPP and APLP.
GO:0042802 identical protein binding
ISO
PMID:23986251
Synaptic protein α1-takusan mitigates amyloid-β-induced syna... 		ACCEPT
Summary: APP forms homodimers through E1 domain interactions. Dimerization is enhanced by copper binding and heparin. Trans-dimerization mediates cell-cell adhesion at synapses (PMID:16193067, App-deep-research-perplexity.md).
Reason: Core molecular function - APP dimerization is functionally important for synaptic adhesion.
Supporting Evidence:
PMID:23986251
Synaptic protein α1-takusan mitigates amyloid-β-induced synaptic loss via interaction with tau and postsynaptic density-95 at postsynaptic sites.
GO:0030424 axon
IDA
PMID:25631124
TREM2 regulates microglial cell activation in response to de... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:25631124
2015 Jan 29. TREM2 regulates microglial cell activation in response to demyelination in vivo.
GO:0005515 protein binding
IPI
PMID:22685302
Down syndrome cell adhesion molecule (DSCAM) associates with... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:22685302
2012 Jun 8. Down syndrome cell adhesion molecule (DSCAM) associates with uncoordinated-5C (UNC5C) in netrin-1-mediated growth cone collapse.
GO:0008021 synaptic vesicle
IDA
PMID:25438880
Pre-synaptic localization of the γ-secretase-inhibiting prot... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:25438880
Pre-synaptic localization of the γ-secretase-inhibiting protein p24α2 in the mammalian brain.
GO:0032760 positive regulation of tumor necrosis factor production
IGI
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the bloo... 		MARK AS OVER ANNOTATED
Summary: Abeta promotes TNF production via RAGE-mediated pathway (PMID:12808450). This is an Abeta-specific function, not intrinsic to full-length APP.
Reason: Over-annotation - specifically Abeta function.
Supporting Evidence:
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the blood-brain barrier and accumulation in brain.
GO:1903523 negative regulation of blood circulation
IGI
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the bloo... 		MARK AS OVER ANNOTATED
Summary: Abeta affects vascular function including endothelin production and blood-brain barrier transport (PMID:12808450). This is primarily Abeta pathophysiology, not full-length APP function.
Reason: Over-annotation - specifically Abeta-mediated vascular effects.
Supporting Evidence:
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the blood-brain barrier and accumulation in brain.
GO:1904472 positive regulation of endothelin production
IGI
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the bloo... 		MARK AS OVER ANNOTATED
Summary: Abeta via RAGE increases endothelin production (PMID:12808450). This is Abeta pathophysiology, not intrinsic APP function.
Reason: Over-annotation - specifically Abeta function.
Supporting Evidence:
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the blood-brain barrier and accumulation in brain.
GO:0030546 signaling receptor activator activity
IDA
PMID:11316806
Amyloid-beta induces chemotaxis and oxidant stress by acting... 		ACCEPT
Summary: Abeta42 activates FPR2 (formyl peptide receptor 2), inducing chemotaxis and oxidant stress in phagocytes (PMID:11316806). Note: this is primarily an Abeta cleavage product function.
Reason: Supported by PMID:11316806, though applies to Abeta rather than full-length APP.
Supporting Evidence:
PMID:11316806
2001 Apr 20. Amyloid-beta induces chemotaxis and oxidant stress by acting at formylpeptide receptor 2, a G protein-coupled receptor expressed in phagocytes and brain.
GO:0005798 Golgi-associated vesicle
IDA
PMID:23931995
Activity-induced convergence of APP and BACE-1 in acidic mic... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:23931995
Activity-induced convergence of APP and BACE-1 in acidic microdomains via an endocytosis-dependent pathway.
GO:0055037 recycling endosome
IDA
PMID:23931995
Activity-induced convergence of APP and BACE-1 in acidic mic... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:23931995
Activity-induced convergence of APP and BACE-1 in acidic microdomains via an endocytosis-dependent pathway.
GO:0005769 early endosome
IDA
PMID:25592972
An aberrant sugar modification of BACE1 blocks its lysosomal... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:25592972
An aberrant sugar modification of BACE1 blocks its lysosomal targeting in Alzheimer's disease.
GO:0050890 cognition
IDA
PMID:25592972
An aberrant sugar modification of BACE1 blocks its lysosomal... 		ACCEPT
Summary: APP is required for normal cognition. APP knockout mice show cognitive deficits that worsen with age (PMID:10188929, PMID:25592972).
Reason: Core function - central to understanding APP's physiological role.
Supporting Evidence:
PMID:25592972
An aberrant sugar modification of BACE1 blocks its lysosomal targeting in Alzheimer's disease.
GO:0005515 protein binding
IPI
PMID:16227578
F-spondin interaction with the apolipoprotein E receptor Apo... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:16227578
F-spondin interaction with the apolipoprotein E receptor ApoEr2 affects processing of amyloid precursor protein.
GO:0009986 cell surface
IDA
PMID:16227578
F-spondin interaction with the apolipoprotein E receptor Apo... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:16227578
F-spondin interaction with the apolipoprotein E receptor ApoEr2 affects processing of amyloid precursor protein.
GO:0005515 protein binding
IPI
PMID:21084623
Identification of NEEP21 as a ß-amyloid precursor protein-in... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:21084623
Identification of NEEP21 as a ß-amyloid precursor protein-interacting protein in vivo that modulates amyloidogenic processing in vitro.
GO:0005515 protein binding
IPI
PMID:20637285
Megalin interacts with APP and the intracellular adapter pro... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:20637285
2010 Jul 14. Megalin interacts with APP and the intracellular adapter protein FE65 in neurons.
GO:0050750 low-density lipoprotein particle receptor binding
IPI
PMID:22383525
Low-density lipoprotein receptor represents an apolipoprotei... 		ACCEPT
Summary: APP interacts with LRP1, ApoER2, and LDLR family members. These interactions regulate APP trafficking and link APP to reelin signaling pathway (PMID:22383525, App-deep-research-perplexity.md).
Reason: Well-documented interactions with functional significance.
Supporting Evidence:
PMID:22383525
2012 Mar 1. Low-density lipoprotein receptor represents an apolipoprotein E-independent pathway of Aβ uptake and degradation by astrocytes.
GO:0007613 memory
TAS
PMID:19118188
Picomolar amyloid-beta positively modulates synaptic plastic... 		ACCEPT
Summary: APP is required for normal memory. APP knockout mice show age-related cognitive deficits. sAPPalpha and picomolar Abeta enhance memory while Abeta oligomers impair memory (PMID:10188929, PMID:19118188, PMID:18568035).
Reason: Core function supported by behavioral studies in knockout mice.
Supporting Evidence:
PMID:19118188
Picomolar amyloid-beta positively modulates synaptic plasticity and memory in hippocampus.
GO:0060291 long-term synaptic potentiation
TAS
PMID:19118188
Picomolar amyloid-beta positively modulates synaptic plastic... 		ACCEPT
Summary: APP is involved in LTP. APP knockout mice show impaired LTP (PMID:10188929). sAPPalpha can rescue LTP deficits (PMID:19118188, App-deep-research-perplexity.md).
Reason: Core function supported by knockout and rescue experiments.
Supporting Evidence:
PMID:19118188
Picomolar amyloid-beta positively modulates synaptic plasticity and memory in hippocampus.
GO:0005515 protein binding
IPI
PMID:27460146
VPS35 regulates cell surface recycling and signaling of dopa... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:27460146
Epub 2016 May 21. VPS35 regulates cell surface recycling and signaling of dopamine receptor D1.
GO:0005911 cell-cell junction
IDA
PMID:23793062
The lymphoid lineage-specific actin-uncapping protein Rltpr ... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:23793062
The lymphoid lineage-specific actin-uncapping protein Rltpr is essential for costimulation via CD28 and the development of regulatory T cells.
GO:0043235 receptor complex
ISO
PMID:23382219
Structural basis for endosomal trafficking of diverse transm... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:23382219
Structural basis for endosomal trafficking of diverse transmembrane cargos by PX-FERM proteins.
GO:0030134 COPII-coated ER to Golgi transport vesicle
IDA
PMID:19966784
Sec24b selectively sorts Vangl2 to regulate planar cell pola... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:19966784
2009 Dec 6. Sec24b selectively sorts Vangl2 to regulate planar cell polarity during neural tube closure.
GO:0010971 positive regulation of G2/M transition of mitotic cell cycle
IMP
PMID:15561424
Lengthening of G2/mitosis in cortical precursors from mice l... 		KEEP AS NON CORE
Summary: APP affects cell cycle progression in cortical precursors. APP knockout lengthens G2/M phase (PMID:15561424).
Reason: Supported by experimental evidence but not core neuronal function.
Supporting Evidence:
PMID:15561424
In APP-deficient cortical precursors, the duration of mitosis is increased and a higher proportion of cortical precursor cells contained nuclei in late G2
GO:0005515 protein binding
IPI
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and prom... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and promote polyadenylation-induced translation.
GO:0005515 protein binding
IPI
PMID:20497468
Interaction of a novel mitochondrial protein, 4-nitrophenylp... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:20497468
Interaction of a novel mitochondrial protein, 4-nitrophenylphosphatase domain and non-neuronal SNAP25-like protein homolog 1 (NIPSNAP1), with the amyloid precursor protein family.
GO:0016020 membrane
IDA
PMID:10845772
Developmental regulation of amyloid precursor protein at the... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:10845772
Developmental regulation of amyloid precursor protein at the neuromuscular junction in mouse skeletal muscle.
GO:0016020 membrane
IDA
PMID:15886206
Spatial segregation of gamma-secretase and substrates in dis... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:15886206
2005 May 10. Spatial segregation of gamma-secretase and substrates in distinct membrane domains.
GO:0016020 membrane
IDA
PMID:9535056
Profiles of amyloid precursor and presenilin 2-like proteins... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:9535056
Profiles of amyloid precursor and presenilin 2-like proteins are correlated during development of the mouse hypothalamus.
GO:0005515 protein binding
IPI
PMID:21795536
LRAD3, a novel low-density lipoprotein receptor family membe... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:21795536
LRAD3, a novel low-density lipoprotein receptor family member that modulates amyloid precursor protein trafficking.
GO:0005886 plasma membrane
IDA
PMID:15009636
Presenilin-1 and intracellular calcium stores regulate neuro... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:15009636
Presenilin-1 and intracellular calcium stores regulate neuronal glutamate uptake.
GO:0006979 response to oxidative stress
IGI
PMID:16478525
Mutations in amyloid precursor protein and presenilin-1 gene... 		ACCEPT
Summary: Experimental annotation (IGI) from PMID:16478525. Supported by direct experimental evidence.
Reason: Experimental annotation (IGI) with literature support.
Supporting Evidence:
PMID:16478525
Mutations in amyloid precursor protein and presenilin-1 genes increase the basal oxidative stress in murine neuronal cells and lead to increased sensitivity to oxidative stress mediated by amyloid beta-peptide (1-42), HO and kainic acid: implications for Alzheimer's disease.
GO:0051402 neuron apoptotic process
IGI
PMID:16478525
Mutations in amyloid precursor protein and presenilin-1 gene... 		KEEP AS NON CORE
Summary: APP products have complex effects on neuronal survival. C31 and AICD enhance apoptosis (PMID:15677459). Abeta induces neurotoxicity. However, sAPPalpha is neuroprotective (PMID:16478525, App-deep-research-perplexity.md).
Reason: Complex biology - different products have opposing effects.
Supporting Evidence:
PMID:16478525
Mutations in amyloid precursor protein and presenilin-1 genes increase the basal oxidative stress in murine neuronal cells and lead to increased sensitivity to oxidative stress mediated by amyloid beta-peptide (1-42), HO and kainic acid: implications for Alzheimer's disease.
GO:0008203 cholesterol metabolic process
IMP
PMID:17920016
Amyloid precursor protein regulates brain apolipoprotein E a... 		ACCEPT
Summary: APP regulates brain cholesterol and apolipoprotein E metabolism through LRP1 interactions (PMID:17920016).
Reason: Supported by experimental evidence linking APP to lipid metabolism.
Supporting Evidence:
PMID:17920016
Amyloid precursor protein regulates brain apolipoprotein E and cholesterol metabolism through lipoprotein receptor LRP1.
GO:0008203 cholesterol metabolic process
IGI
PMID:17920016
Amyloid precursor protein regulates brain apolipoprotein E a... 		ACCEPT
Summary: APP regulates brain cholesterol and apolipoprotein E metabolism through LRP1 interactions (PMID:17920016).
Reason: Supported by experimental evidence linking APP to lipid metabolism.
Supporting Evidence:
PMID:17920016
Amyloid precursor protein regulates brain apolipoprotein E and cholesterol metabolism through lipoprotein receptor LRP1.
GO:0010468 regulation of gene expression
IDA
PMID:12074840
Abeta-degrading endopeptidase, neprilysin, in mouse brain: s... 		ACCEPT
Summary: AICD functions as transcriptional regulator via Fe65-Tip60 complex. Regulates genes involved in neurogenesis, apoptosis, and Abeta metabolism (PMID:12074840, App-deep-research-perplexity.md).
Reason: Core AICD function.
Supporting Evidence:
PMID:12074840
Abeta-degrading endopeptidase, neprilysin, in mouse brain: synaptic and axonal localization inversely correlating with Abeta pathology.
GO:0008088 axo-dendritic transport
IGI
PMID:20829454
Tau reduction prevents Abeta-induced defects in axonal trans... 		ACCEPT
Summary: APP functions as kinesin-1 membrane receptor, mediating axonal transport of BACE1, presenilin-1 and other cargo. AICD interacts with kinesin light chains (PMID:11740561, PMID:20829454, UniProt P12023).
Reason: Core function - APP is a well-characterized cargo receptor for axonal transport.
Supporting Evidence:
PMID:20829454
Tau reduction prevents Abeta-induced defects in axonal transport.
GO:0005515 protein binding
IPI
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modula... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modulates neurogenesis.
GO:0045665 negative regulation of neuron differentiation
IDA
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modula... 		ACCEPT
Summary: Full-length APP with TAG1 and Fe65 negatively modulates neurogenesis. AICD overexpression suppresses adult hippocampal neurogenesis (PMID:18278038, App-deep-research-perplexity.md).
Reason: Supported by evidence - different APP products have opposing effects on neurogenesis.
Supporting Evidence:
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modulates neurogenesis.
GO:0045665 negative regulation of neuron differentiation
IGI
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modula... 		ACCEPT
Summary: Full-length APP with TAG1 and Fe65 negatively modulates neurogenesis. AICD overexpression suppresses adult hippocampal neurogenesis (PMID:18278038, App-deep-research-perplexity.md).
Reason: Supported by evidence - different APP products have opposing effects on neurogenesis.
Supporting Evidence:
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modulates neurogenesis.
GO:0005515 protein binding
IPI
PMID:17727637
Characterization of the adaptor protein ARH expression in th... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:17727637
Epub 2007 Aug 28. Characterization of the adaptor protein ARH expression in the brain and ARH molecular interactions.
GO:0005515 protein binding
IPI
PMID:17121854
Essential roles for Fe65, Alzheimer amyloid precursor-bindin... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:17121854
Nov 22. Essential roles for Fe65, Alzheimer amyloid precursor-binding protein, in the cellular response to DNA damage.
GO:0045944 positive regulation of transcription by RNA polymerase II
IGI
PMID:15944124
Presenilin-dependent transcriptional control of the Abeta-de... 		ACCEPT
Summary: AICD-Fe65-Tip60 complex activates transcription of target genes including neprilysin (PMID:15944124, App-deep-research-perplexity.md).
Reason: Core AICD signaling function supported by mechanistic evidence.
Supporting Evidence:
PMID:15944124
Neprilysin activity is restored by transient expression of PS1 or PS2 and by expression of the amyloid intracellular domain (AICD), which is cogenerated with Abeta, during gamma-secretase cleavage of betaAPP
GO:0045944 positive regulation of transcription by RNA polymerase II
IDA
PMID:15944124
Presenilin-dependent transcriptional control of the Abeta-de... 		ACCEPT
Summary: AICD-Fe65-Tip60 complex activates transcription of target genes including neprilysin (PMID:15944124, App-deep-research-perplexity.md).
Reason: Core AICD signaling function supported by mechanistic evidence.
Supporting Evidence:
PMID:15944124
Neprilysin gene promoters are transactivated by AICDs from APP-like proteins (APP, APLP1, and APLP2), but not by Abeta or by the gamma-secretase cleavage products of Notch, N- or E- cadherins
GO:0006468 protein phosphorylation
IMP
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta. 		REMOVE
Summary: MISANNOTATION: APP does NOT catalyze phosphorylation. PMID:16025111 describes DEPHOSPHORYLATION of NR2B by phosphatases PP2B and STEP, triggered by Abeta. APP has no kinase activity (UniProt P12023).
Reason: Incorrect annotation - APP triggers dephosphorylation, not phosphorylation, and has no kinase activity.
Supporting Evidence:
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta.
GO:0006897 endocytosis
IMP
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta. 		ACCEPT
Summary: APP undergoes clathrin-mediated endocytosis via its YENPTY motif. APP also regulates NMDA receptor endocytosis through Abeta-mediated signaling (PMID:16025111, UniProt P12023).
Reason: Core function - APP endocytosis is essential for its processing and signaling.
Supporting Evidence:
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta.
GO:0035235 ionotropic glutamate receptor signaling pathway
IMP
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta. 		ACCEPT
Summary: IBA annotation. APP processing affects NMDA receptor trafficking and function. Abeta promotes NMDA receptor endocytosis via alpha7 nicotinic receptor, PP2B and STEP pathway (PMID:16025111). sAPPalpha facilitates NMDAR currents (App-deep-research-perplexity.md).
Reason: Supported by mechanistic studies showing APP/Abeta regulation of NMDAR trafficking.
Supporting Evidence:
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta.
GO:0043005 neuron projection
IDA
PMID:16301330
Coordinated transport of phosphorylated amyloid-beta precurs... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:16301330
The accumulation of JIP-1 and pAPP in neurites requires kinesin-1
GO:0006417 regulation of translation
IDA
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and prom... 		ACCEPT
Summary: APP anchors CPEB1 to membranes and promotes polyadenylation-induced translation (PMID:16314516).
Reason: Supported by mechanistic evidence for APP-CPEB interaction.
Supporting Evidence:
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and promote polyadenylation-induced translation.
GO:0180011 cytosolic mRNA polyadenylation
IDA
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and prom... 		ACCEPT
Summary: APP promotes cytoplasmic polyadenylation via CPEB1 interaction (PMID:16314516).
Reason: Supported by mechanistic evidence.
Supporting Evidence:
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and promote polyadenylation-induced translation.
GO:0005794 Golgi apparatus
IDA
PMID:16018997
The ciliary rootlet interacts with kinesin light chains and ... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:16018997
The ciliary rootlet interacts with kinesin light chains and may provide a scaffold for kinesin-1 vesicular cargos.
GO:0035253 ciliary rootlet
IDA
PMID:16018997
The ciliary rootlet interacts with kinesin light chains and ... 		UNDECIDED
Summary: PMID:16018997 shows APP interacts with ciliary rootlet proteins via kinesin light chains. Unusual localization, needs verification.
Reason: Unexpected localization - may reflect kinesin transport rather than functional localization.
Supporting Evidence:
PMID:16018997
The ciliary rootlet interacts with kinesin light chains and may provide a scaffold for kinesin-1 vesicular cargos.
GO:0001967 suckling behavior
IGI
PMID:9461064
Generation of APLP2 KO mice and early postnatal lethality in... 		KEEP AS NON CORE
Summary: APP/APLP2 double knockouts die postnatally with suckling defects (PMID:9461064).
Reason: Non-core - reflects severe nervous system dysfunction in double KO.
Supporting Evidence:
PMID:9461064
Approximately 80% of double KO mice die within the first week after birth, suggesting that APLP2 and APP are required for early postnatal development
GO:0007617 mating behavior
IGI
PMID:9461064
Generation of APLP2 KO mice and early postnatal lethality in... 		KEEP AS NON CORE
Summary: APP/APLP2 double knockouts show mating behavior deficits (PMID:9461064). Reflects pleiotropic effects of APP family loss.
Reason: Non-core - behavioral consequence of nervous system dysfunction.
Supporting Evidence:
PMID:9461064
Adult double KO mice mate poorly, despite apparent normal ovarian and testicular development
GO:0007626 locomotory behavior
IGI
PMID:9461064
Generation of APLP2 KO mice and early postnatal lethality in... 		ACCEPT
Summary: APP knockout mice show locomotor deficits (PMID:9461064, PMID:7758106).
Reason: Supported by knockout phenotypes.
Supporting Evidence:
PMID:9461064
show difficulty in righting, ataxia, spinning behavior, and a head tilt, suggesting a deficit in balance and/or strength
GO:0008344 adult locomotory behavior
IMP
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a ... 		ACCEPT
Summary: APP knockout mice show locomotor deficits (PMID:7758106, PMID:8001115, PMID:10188929). Reflects APP's importance for normal nervous system function.
Reason: Supported by knockout phenotypes.
Supporting Evidence:
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a modified beta-amyloid precursor protein gene.
GO:0016199 axon midline choice point recognition
IMP
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a ... 		ACCEPT
Summary: Experimental annotation (IMP) from PMID:8001115. Supported by direct experimental evidence.
Reason: Experimental annotation (IMP) with literature support.
Supporting Evidence:
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a modified beta-amyloid precursor protein gene.
GO:0030900 forebrain development
IMP
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a ... 		ACCEPT
Summary: APP family is essential for forebrain development. Triple knockout (APP/APLP1/APLP2) mice show cortical dysplasia resembling type 2 lissencephaly (PMID:15385965, PMID:10200318).
Reason: Core developmental function demonstrated by knockout phenotypes.
Supporting Evidence:
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a modified beta-amyloid precursor protein gene.
GO:0031175 neuron projection development
IDA
PMID:8083748
Peptides containing the RERMS sequence of amyloid beta/A4 pr... 		ACCEPT
Summary: IBA annotation. APP and its proteolytic products regulate both axon and dendrite development. sAPPalpha promotes neurite outgrowth. Well-supported by APP knockout phenotypes (PMID:8083748, PMID:9390996, App-deep-research-perplexity.md).
Reason: Core biological process. Multiple lines of evidence support APP role in neurite development.
Supporting Evidence:
PMID:8083748
Peptides containing the RERMS sequence of amyloid beta/A4 protein precursor bind cell surface and promote neurite extension.
GO:0048471 perinuclear region of cytoplasm
IDA
PMID:8207383
Embryonic expression pattern of amyloid protein precursor su... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:8207383
Immunohistochemical analysis revealed the temporal and spatial expression pattern of the amyloid protein precursor (APP) during the development of the mouse embryo
GO:0050885 neuromuscular process controlling balance
IGI
PMID:9461064
Generation of APLP2 KO mice and early postnatal lethality in... 		ACCEPT
Summary: APP knockout affects balance (PMID:9461064). APP is important for neuromuscular junction function (App-deep-research-perplexity.md).
Reason: Supported by knockout phenotypes and NMJ localization.
Supporting Evidence:
PMID:9461064
show difficulty in righting, ataxia, spinning behavior, and a head tilt, suggesting a deficit in balance and/or strength
GO:0051563 smooth endoplasmic reticulum calcium ion homeostasis
IGI
PMID:12431992
Capacitive calcium entry is directly attenuated by mutant pr... 		ACCEPT
Summary: Experimental annotation (IGI) from PMID:12431992. Supported by direct experimental evidence.
Reason: Experimental annotation (IGI) with literature support.
Supporting Evidence:
PMID:12431992
Nov 12. Capacitive calcium entry is directly attenuated by mutant presenilin-1, independent of the expression of the amyloid precursor protein.
GO:0005515 protein binding
IPI
PMID:16227582
Transforming growth factor beta2 is a neuronal death-inducin... 		MARK AS OVER ANNOTATED
Summary: Generic 'protein binding' annotation. APP interacts with numerous specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. These specific interactions should be annotated instead of generic protein binding.
Reason: Too generic - specific binding partners (PTB domain proteins, secretases, etc.) should be annotated.
Supporting Evidence:
PMID:16227582
Transforming growth factor beta2 is a neuronal death-inducing ligand for amyloid-beta precursor protein.
GO:0005737 cytoplasm
IDA
PMID:10845772
Developmental regulation of amyloid precursor protein at the... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:10845772
Developmental regulation of amyloid precursor protein at the neuromuscular junction in mouse skeletal muscle.
GO:0006878 intracellular copper ion homeostasis
IMP
PMID:10526140
Copper levels are increased in the cerebral cortex and liver... 		ACCEPT
Summary: APP binds copper and affects copper homeostasis. APP knockout increases brain copper levels. APP delivers copper to GPC1 (PMID:10526140, PMID:15447675, UniProt P12023).
Reason: Core function supported by knockout phenotypes and biochemical evidence.
Supporting Evidence:
PMID:10526140
Copper levels are increased in the cerebral cortex and liver of APP and APLP2 knockout mice.
GO:0006878 intracellular copper ion homeostasis
IGI
PMID:15447675
Gene knockout of amyloid precursor protein and amyloid precu... 		ACCEPT
Summary: APP binds copper and affects copper homeostasis. APP knockout increases brain copper levels. APP delivers copper to GPC1 (PMID:10526140, PMID:15447675, UniProt P12023).
Reason: Core function supported by knockout phenotypes and biochemical evidence.
Supporting Evidence:
PMID:15447675
Gene knockout of amyloid precursor protein and amyloid precursor-like protein-2 increases cellular copper levels in primary mouse cortical neurons and embryonic fibroblasts.
GO:0008344 adult locomotory behavior
IMP
PMID:10188929
Age-related cognitive deficits, impaired long-term potentiat... 		ACCEPT
Summary: APP knockout mice show locomotor deficits (PMID:7758106, PMID:8001115, PMID:10188929). Reflects APP's importance for normal nervous system function.
Reason: Supported by knockout phenotypes.
Supporting Evidence:
PMID:10188929
Another six mice from the same population that were showing weight loss and hypolocomotor activity exhibited a marked reactive gliosis
GO:0008344 adult locomotory behavior
IMP
PMID:7758106
beta-Amyloid precursor protein-deficient mice show reactive ... 		ACCEPT
Summary: APP knockout mice show locomotor deficits (PMID:7758106, PMID:8001115, PMID:10188929). Reflects APP's importance for normal nervous system function.
Reason: Supported by knockout phenotypes.
Supporting Evidence:
PMID:7758106
beta-Amyloid precursor protein-deficient mice show reactive gliosis and decreased locomotor activity.
GO:0008344 adult locomotory behavior
IMP
PMID:9754878
Neurobehavioral development, adult openfield exploration and... 		ACCEPT
Summary: APP knockout mice show locomotor deficits (PMID:7758106, PMID:8001115, PMID:10188929). Reflects APP's importance for normal nervous system function.
Reason: Supported by knockout phenotypes.
Supporting Evidence:
PMID:9754878
Neurobehavioral development, adult openfield exploration and swimming navigation learning in mice with a modified beta-amyloid precursor protein gene.
GO:0016358 dendrite development
IMP
PMID:10188929
Age-related cognitive deficits, impaired long-term potentiat... 		ACCEPT
Summary: APP regulates dendrite development. APP knockout mice show reduced dendritic marker density. APP is localized to dendrites and affects dendritic spine plasticity (PMID:10188929, PMID:9390996, App-deep-research-perplexity.md).
Reason: Core function supported by knockout phenotypes.
Supporting Evidence:
PMID:10188929
a profound loss of immunoreactivities for the presynaptic terminal vesicle marker proteins synaptophysin and synapsin and the dendritic marker microtubule-associated protein-2 in many brain areas
GO:0016358 dendrite development
IGI
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid pre... 		ACCEPT
Summary: APP regulates dendrite development. APP knockout mice show reduced dendritic marker density. APP is localized to dendrites and affects dendritic spine plasticity (PMID:10188929, PMID:9390996, App-deep-research-perplexity.md).
Reason: Core function supported by knockout phenotypes.
Supporting Evidence:
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid precursor protein (APP) and APP-Like protein 2.
GO:0031594 neuromuscular junction
IDA
PMID:10845772
Developmental regulation of amyloid precursor protein at the... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:10845772
Developmental regulation of amyloid precursor protein at the neuromuscular junction in mouse skeletal muscle.
GO:0040014 regulation of multicellular organism growth
IMP
PMID:9754878
Neurobehavioral development, adult openfield exploration and... 		ACCEPT
Summary: Experimental annotation (IMP) from PMID:9754878. Supported by direct experimental evidence.
Reason: Experimental annotation (IMP) with literature support.
Supporting Evidence:
PMID:9754878
Neurobehavioral development, adult openfield exploration and swimming navigation learning in mice with a modified beta-amyloid precursor protein gene.
GO:0048669 collateral sprouting in absence of injury
IGI
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid pre... 		ACCEPT
Summary: APP affects axon sprouting at NMJ (PMID:15689559). Related to APP's role in axon guidance and NMJ development.
Reason: Supported by experimental evidence.
Supporting Evidence:
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid precursor protein (APP) and APP-Like protein 2.
GO:0051124 synaptic assembly at neuromuscular junction
IGI
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid pre... 		ACCEPT
Summary: APP is required for normal NMJ formation. APP interacts with LRP4 and promotes MuSK phosphorylation. APP/APLP2 double KO has severe NMJ defects (PMID:15689559, App-deep-research-perplexity.md).
Reason: Core function at NMJ supported by knockout phenotypes.
Supporting Evidence:
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid precursor protein (APP) and APP-Like protein 2.
GO:0007409 axonogenesis
IMP
PMID:9390996
The beta-amyloid precursor protein of Alzheimer's disease en... 		ACCEPT
Summary: IBA annotation. Full-length APP regulates axon development. APP knockout mice show defects in axonogenesis. sAPPalpha promotes neurite outgrowth while full-length APP with Fe65/Mena inhibits branching to ensure directional growth (PMID:10188929, App-deep-research-perplexity.md).
Reason: Core biological process. Well-supported by knockout studies and mechanistic understanding.
Supporting Evidence:
PMID:9390996
The beta-amyloid precursor protein of Alzheimer's disease enhances neuron viability and modulates neuronal polarity.
GO:0016020 membrane
IDA
PMID:12927782
Both raft- and non-raft proteins associate with CHAPS-insolu... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:12927782
Both raft- and non-raft proteins associate with CHAPS-insoluble complexes: some APP in large complexes.
GO:0016322 neuron remodeling
IMP
PMID:10219973
Mechanisms contributing to the deficits in hippocampal synap... 		ACCEPT
Summary: APP regulates structural synaptic plasticity including dendritic spine density and morphology. APP deficiency impairs synaptic remodeling (PMID:10219973, App-deep-research-perplexity.md).
Reason: Supported by evidence for APP role in structural plasticity.
Supporting Evidence:
PMID:10219973
Mechanisms contributing to the deficits in hippocampal synaptic plasticity in mice lacking amyloid precursor protein.
GO:0016358 dendrite development
IMP
PMID:9390996
The beta-amyloid precursor protein of Alzheimer's disease en... 		ACCEPT
Summary: APP regulates dendrite development. APP knockout mice show reduced dendritic marker density. APP is localized to dendrites and affects dendritic spine plasticity (PMID:10188929, PMID:9390996, App-deep-research-perplexity.md).
Reason: Core function supported by knockout phenotypes.
Supporting Evidence:
PMID:9390996
The beta-amyloid precursor protein of Alzheimer's disease enhances neuron viability and modulates neuronal polarity.
GO:0045177 apical part of cell
IDA
PMID:15561424
Lengthening of G2/mitosis in cortical precursors from mice l... 		ACCEPT
Summary: APP localizes apically in cortical precursor cells during interphase. Lopez-Sanchez et al. (2005) showed APP protein concentrated in apical domains.
Reason: Supported by localization studies.
Supporting Evidence:
PMID:15561424
APP protein is concentrated within their apical domains during interphase
GO:0045931 positive regulation of mitotic cell cycle
IMP
PMID:15561424
Lengthening of G2/mitosis in cortical precursors from mice l... 		KEEP AS NON CORE
Summary: APP affects cell cycle in neural precursors. Lopez-Sanchez et al. (2005) showed APP knockout lengthens mitosis in cortical precursors.
Reason: Non-core function - APP is primarily studied in post-mitotic neurons.
Supporting Evidence:
PMID:15561424
during cortical development APP plays a role in controlling cell cycle progression, particularly affecting G2 and mitosis
GO:0050803 regulation of synapse structure or activity
IMP
PMID:10219973
Mechanisms contributing to the deficits in hippocampal synap... 		ACCEPT
Summary: Experimental annotation (IMP) from PMID:10219973. Supported by direct experimental evidence.
Reason: Experimental annotation (IMP) with literature support.
Supporting Evidence:
PMID:10219973
Mechanisms contributing to the deficits in hippocampal synaptic plasticity in mice lacking amyloid precursor protein.
GO:0051233 spindle midzone
IDA
PMID:15561424
Lengthening of G2/mitosis in cortical precursors from mice l... 		KEEP AS NON CORE
Summary: APP localizes to spindle midzone during mitosis in cortical precursors. Lopez-Sanchez et al. (2005) showed APP re-localizes during mitosis.
Reason: Non-core - atypical localization in dividing cells.
Supporting Evidence:
PMID:15561424
during mitosis, APP re-localizes to the peripheral space surrounding the metaphase plate
GO:0008542 visual learning
IMP
PMID:10338291
No hippocampal neuron or synaptic bouton loss in learning-im... 		ACCEPT
Summary: APP knockout mice show visual learning deficits (PMID:10338291). Reflects cognitive impairment.
Reason: Supported by behavioral studies.
Supporting Evidence:
PMID:10338291
No hippocampal neuron or synaptic bouton loss in learning-impaired aged beta-amyloid precursor protein-null mice.
GO:0030900 forebrain development
IMP
PMID:10200318
Genetic background changes the pattern of forebrain commissu... 		ACCEPT
Summary: APP family is essential for forebrain development. Triple knockout (APP/APLP1/APLP2) mice show cortical dysplasia resembling type 2 lissencephaly (PMID:15385965, PMID:10200318).
Reason: Core developmental function demonstrated by knockout phenotypes.
Supporting Evidence:
PMID:10200318
independently of genetic background, both lack and underexpression of betaAPP are associated with reduced brain weight and reduced size of forebrain commissures
GO:0008088 axo-dendritic transport
IMP
PMID:11740561
Kinesin-mediated axonal transport of a membrane compartment ... 		ACCEPT
Summary: APP functions as kinesin-1 membrane receptor, mediating axonal transport of BACE1, presenilin-1 and other cargo. AICD interacts with kinesin light chains (PMID:11740561, PMID:20829454, UniProt P12023).
Reason: Core function - APP is a well-characterized cargo receptor for axonal transport.
Supporting Evidence:
PMID:11740561
The fast anterograde axonal transport of this compartment is mediated by APP and kinesin-I
GO:0030424 axon
IDA
PMID:11740561
Kinesin-mediated axonal transport of a membrane compartment ... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:11740561
Proteolytic processing of APP can occur in the compartment in vitro and in vivo in axons
GO:0030424 axon
IDA
PMID:15745965
Axonal transport, amyloid precursor protein, kinesin-1, and ... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:15745965
Axonal transport, amyloid precursor protein, kinesin-1, and the processing apparatus: revisited.
GO:0031410 cytoplasmic vesicle
IDA
PMID:11740561
Kinesin-mediated axonal transport of a membrane compartment ... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:11740561
we identify an axonal membrane compartment that contains APP, beta-secretase and presenilin-1
GO:0031410 cytoplasmic vesicle
IDA
PMID:15745965
Axonal transport, amyloid precursor protein, kinesin-1, and ... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:15745965
Axonal transport, amyloid precursor protein, kinesin-1, and the processing apparatus: revisited.
GO:0016020 membrane
TAS
PMID:11877420
Tyrosine phosphorylation of the beta-amyloid precursor prote... 		ACCEPT
Summary: Cellular component annotation supported by APP trafficking and localization studies. APP is found in multiple cellular compartments consistent with its complex processing pathway (UniProt P12023, App-deep-research-perplexity.md).
Reason: Well-documented localization consistent with APP biology.
Supporting Evidence:
PMID:11877420
2002 Mar 4. Tyrosine phosphorylation of the beta-amyloid precursor protein cytoplasmic tail promotes interaction with Shc.
GO:0005507 copper ion binding
NAS NEW
Summary: Added to align core_functions with existing annotations.
Reason: Core function term not present in existing_annotations.

Core Functions

APP functions as a cell adhesion molecule through homophilic and heterophilic trans-synaptic interactions. Trans-dimerization via E1 domain mediates cell-cell adhesion at synapses. IntAct data confirms APP homodimerization (EBI-78814) and heterodimerization with APLP1/APLP2 (PMID:16193067).

Molecular Function:
identical protein binding

APP contains two heparin-binding domains in E1 (high-affinity) and E2 (lower-affinity) regions. Heparin binding mediates APP-ECM interactions and promotes homodimerization. This is a core structural feature of the E1 GFLD and E2 domains (UniProt P12023, App-deep-research-perplexity.md).

Molecular Function:
heparin binding

APP binds copper with nanomolar affinity via CuBD in E1 domain. Copper binding affects APP dimerization and processing. APP delivers copper to GPC1. APP knockout increases brain copper levels (UniProt P12023).

Molecular Function:
copper ion binding
Supporting Evidence:
  • PMID:10526140
    Copper levels are increased in the cerebral cortex and liver of APP and APLP2 knockout mice.

APP cytoplasmic tail contains YENPTY motif that binds PTB domain proteins including Fe65, X11/Mint, Dab1, Numb. This is a core mechanism for APP intracellular signaling and trafficking (UniProt P12023, App-deep-research-perplexity.md).

Molecular Function:
PTB domain binding

References

GO_REF:0000002
Gene Ontology annotation through association of InterPro records with GO terms
GO_REF:0000024
Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity
GO_REF:0000033
Annotation inferences using phylogenetic trees
GO_REF:0000043
Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
GO_REF:0000044
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
GO_REF:0000096
Automated transfer of experimentally-verified manual GO annotation data to mouse-rat orthologs
GO_REF:0000108
Automatic assignment of GO terms using logical inference, based on on inter-ontology links
GO_REF:0000114
Manual transfer of experimentally-verified manual GO annotation data to homologous complexes by curator judgment of sequence, composition and function similarity
GO_REF:0000117
Electronic Gene Ontology annotations created by ARBA machine learning models
GO_REF:0000119
Automated transfer of experimentally-verified manual GO annotation data to mouse-human orthologs
GO_REF:0000120
Combined Automated Annotation using Multiple IEA Methods
PMID:10188929
Age-related cognitive deficits, impaired long-term potentiation and reduction in synaptic marker density in mice lacking the beta-amyloid precursor protein.
PMID:10200318
Genetic background changes the pattern of forebrain commissure defects in transgenic mice underexpressing the beta-amyloid-precursor protein.
PMID:10219973
Mechanisms contributing to the deficits in hippocampal synaptic plasticity in mice lacking amyloid precursor protein.
PMID:10338291
No hippocampal neuron or synaptic bouton loss in learning-impaired aged beta-amyloid precursor protein-null mice.
PMID:10460257
Disabled-1 binds to the cytoplasmic domain of amyloid precursor-like protein 1.
PMID:10526140
Copper levels are increased in the cerebral cortex and liver of APP and APLP2 knockout mice.
PMID:10845772
Developmental regulation of amyloid precursor protein at the neuromuscular junction in mouse skeletal muscle.
PMID:11316806
Amyloid-beta induces chemotaxis and oxidant stress by acting at formylpeptide receptor 2, a G protein-coupled receptor expressed in phagocytes and brain.
PMID:11517249
c-Jun N-terminal kinase (JNK)-interacting protein-1b/islet-brain-1 scaffolds Alzheimer's amyloid precursor protein with JNK.
PMID:11724784
Jun NH2-terminal kinase (JNK) interacting protein 1 (JIP1) binds the cytoplasmic domain of the Alzheimer's beta-amyloid precursor protein (APP).
PMID:11740561
Kinesin-mediated axonal transport of a membrane compartment containing beta-secretase and presenilin-1 requires APP.
PMID:11877420
Tyrosine phosphorylation of the beta-amyloid precursor protein cytoplasmic tail promotes interaction with Shc.
PMID:12074840
Abeta-degrading endopeptidase, neprilysin, in mouse brain: synaptic and axonal localization inversely correlating with Abeta pathology.
PMID:12431992
Capacitive calcium entry is directly attenuated by mutant presenilin-1, independent of the expression of the amyloid precursor protein.
PMID:12808450
RAGE mediates amyloid-beta peptide transport across the blood-brain barrier and accumulation in brain.
PMID:12826668
Crystal structures of the Dab homology domains of mouse disabled 1 and 2.
PMID:12927782
Both raft- and non-raft proteins associate with CHAPS-insoluble complexes: some APP in large complexes.
PMID:15009636
Presenilin-1 and intracellular calcium stores regulate neuronal glutamate uptake.
PMID:15190117
Neurogenic effect of beta-amyloid peptide in the development of neural stem cells.
PMID:15385965
Cortical dysplasia resembling human type 2 lissencephaly in mice lacking all three APP family members.
PMID:15447675
Gene knockout of amyloid precursor protein and amyloid precursor-like protein-2 increases cellular copper levels in primary mouse cortical neurons and embryonic fibroblasts.
PMID:15561424
Lengthening of G2/mitosis in cortical precursors from mice lacking beta-amyloid precursor protein.
PMID:15689559
Defective neuromuscular synapses in mice lacking amyloid precursor protein (APP) and APP-Like protein 2.
PMID:15745965
Axonal transport, amyloid precursor protein, kinesin-1, and the processing apparatus: revisited.
PMID:15886206
Spatial segregation of gamma-secretase and substrates in distinct membrane domains.
PMID:15944124
Presenilin-dependent transcriptional control of the Abeta-degrading enzyme neprilysin by intracellular domains of betaAPP and APLP.
PMID:16018997
The ciliary rootlet interacts with kinesin light chains and may provide a scaffold for kinesin-1 vesicular cargos.
PMID:16025111
Regulation of NMDA receptor trafficking by amyloid-beta.
PMID:16193067
Homo- and heterodimerization of APP family members promotes intercellular adhesion.
PMID:16227578
F-spondin interaction with the apolipoprotein E receptor ApoEr2 affects processing of amyloid precursor protein.
PMID:16227582
Transforming growth factor beta2 is a neuronal death-inducing ligand for amyloid-beta precursor protein.
PMID:16301330
Coordinated transport of phosphorylated amyloid-beta precursor protein and c-Jun NH2-terminal kinase-interacting protein-1.
PMID:16314516
Amyloid precursor proteins anchor CPEB to membranes and promote polyadenylation-induced translation.
PMID:16407538
Interaction of the cytosolic domains of sorLA/LR11 with the amyloid precursor protein (APP) and beta-secretase beta-site APP-cleaving enzyme.
PMID:16478525
Mutations in amyloid precursor protein and presenilin-1 genes increase the basal oxidative stress in murine neuronal cells and lead to increased sensitivity to oxidative stress mediated by amyloid beta-peptide (1-42), HO and kainic acid: implications for Alzheimer's disease.
PMID:17121854
Essential roles for Fe65, Alzheimer amyloid precursor-binding protein, in the cellular response to DNA damage.
PMID:17727637
Characterization of the adaptor protein ARH expression in the brain and ARH molecular interactions.
PMID:17920016
Amyloid precursor protein regulates brain apolipoprotein E and cholesterol metabolism through lipoprotein receptor LRP1.
PMID:17934213
The in vivo brain interactome of the amyloid precursor protein.
PMID:18278038
A TAG1-APP signalling pathway through Fe65 negatively modulates neurogenesis.
PMID:18568035
Amyloid-beta protein dimers isolated directly from Alzheimer's brains impair synaptic plasticity and memory.
PMID:18650440
Structure of the C-terminal phosphotyrosine interaction domain of Fe65L1 complexed with the cytoplasmic tail of amyloid precursor protein reveals a novel peptide binding mode.
PMID:19118188
Picomolar amyloid-beta positively modulates synaptic plasticity and memory in hippocampus.
PMID:19242475
Cellular prion protein mediates impairment of synaptic plasticity by amyloid-beta oligomers.
PMID:19966784
Sec24b selectively sorts Vangl2 to regulate planar cell polarity during neural tube closure.
PMID:20133875
Synthetic amyloid-beta oligomers impair long-term memory independently of cellular prion protein.
PMID:20497468
Interaction of a novel mitochondrial protein, 4-nitrophenylphosphatase domain and non-neuronal SNAP25-like protein homolog 1 (NIPSNAP1), with the amyloid precursor protein family.
PMID:20573181
Progressive accumulation of amyloid-beta oligomers in Alzheimer's disease and in amyloid precursor protein transgenic mice is accompanied by selective alterations in synaptic scaffold proteins.
PMID:20637285
Megalin interacts with APP and the intracellular adapter protein FE65 in neurons.
PMID:20817278
Iron-export ferroxidase activity of β-amyloid precursor protein is inhibited by zinc in Alzheimer's disease.
PMID:20829454
Tau reduction prevents Abeta-induced defects in axonal transport.
PMID:20925061
Molecular characterization of a trafficking organelle: dissecting the axonal paths of calsyntenin-1 transport vesicles.
PMID:21084623
Identification of NEEP21 as a ß-amyloid precursor protein-interacting protein in vivo that modulates amyloidogenic processing in vitro.
PMID:21113149
Reversing EphB2 depletion rescues cognitive functions in Alzheimer model.
PMID:21368882
TGF-β induces TIAF1 self-aggregation via type II receptor-independent signaling that leads to generation of amyloid β plaques in Alzheimer's disease.
PMID:21795536
LRAD3, a novel low-density lipoprotein receptor family member that modulates amyloid precursor protein trafficking.
PMID:22383525
Low-density lipoprotein receptor represents an apolipoprotein E-independent pathway of Aβ uptake and degradation by astrocytes.
PMID:22685302
Down syndrome cell adhesion molecule (DSCAM) associates with uncoordinated-5C (UNC5C) in netrin-1-mediated growth cone collapse.
PMID:22820466
Alzheimer amyloid-β oligomer bound to postsynaptic prion protein activates Fyn to impair neurons.
PMID:23283322
Sortilin and SorLA display distinct roles in processing and trafficking of amyloid precursor protein.
PMID:23382219
Structural basis for endosomal trafficking of diverse transmembrane cargos by PX-FERM proteins.
PMID:23585889
Generation of amyloid-β is reduced by the interaction of calreticulin with amyloid precursor protein, presenilin and nicastrin.
PMID:23719799
A tetra(ethylene glycol) derivative of benzothiazole aniline enhances Ras-mediated spinogenesis.
PMID:23793062
The lymphoid lineage-specific actin-uncapping protein Rltpr is essential for costimulation via CD28 and the development of regulatory T cells.
PMID:23815291
Amyloid precursor proteins are constituents of the presynaptic active zone.
PMID:23931995
Activity-induced convergence of APP and BACE-1 in acidic microdomains via an endocytosis-dependent pathway.
PMID:23986251
Synaptic protein α1-takusan mitigates amyloid-β-induced synaptic loss via interaction with tau and postsynaptic density-95 at postsynaptic sites.
PMID:24305806
Pharmacologic inhibition of ROCK2 suppresses amyloid-β production in an Alzheimer's disease mouse model.
PMID:25438880
Pre-synaptic localization of the γ-secretase-inhibiting protein p24α2 in the mammalian brain.
PMID:25592972
An aberrant sugar modification of BACE1 blocks its lysosomal targeting in Alzheimer's disease.
PMID:25631124
TREM2 regulates microglial cell activation in response to demyelination in vivo.
PMID:26960425
Yeast Two-Hybrid Screening for Proteins that Interact with the Extracellular Domain of Amyloid Precursor Protein.
PMID:27460146
VPS35 regulates cell surface recycling and signaling of dopamine receptor D1.
PMID:30902970
Complex formation of APP with GABA(B) receptors links axonal trafficking to amyloidogenic processing.
PMID:7758106
beta-Amyloid precursor protein-deficient mice show reactive gliosis and decreased locomotor activity.
PMID:8001115
Behavioral and anatomical deficits in mice homozygous for a modified beta-amyloid precursor protein gene.
PMID:8083748
Peptides containing the RERMS sequence of amyloid beta/A4 protein precursor bind cell surface and promote neurite extension.
PMID:8207383
Embryonic expression pattern of amyloid protein precursor suggests a role in differentiation of specific subsets of neurons.
PMID:9390996
The beta-amyloid precursor protein of Alzheimer's disease enhances neuron viability and modulates neuronal polarity.
PMID:9461064
Generation of APLP2 KO mice and early postnatal lethality in APLP2/APP double KO mice.
PMID:9535056
Profiles of amyloid precursor and presenilin 2-like proteins are correlated during development of the mouse hypothalamus.
PMID:9754878
Neurobehavioral development, adult openfield exploration and swimming navigation learning in mice with a modified beta-amyloid precursor protein gene.
file:mouse/App/App-deep-research-perplexity.md
Deep research report on App

📚 Additional Documentation

Deep Research Perplexity

(App-deep-research-perplexity.md)

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template_variables:
organism: mouse
gene_id: App
gene_symbol: App
uniprot_accession: P12023
protein_description: 'RecName: Full=Amyloid-beta precursor protein {ECO:0000250|UniProtKB:P05067};
AltName: Full=ABPP; Short=APP; AltName: Full=Alzheimer disease amyloid A4 protein
homolog; AltName: Full=Alzheimer disease amyloid protein; AltName: Full=Amyloid
precursor protein {ECO:0000305}; AltName: Full=Amyloid-beta (A4) precursor protein
{ECO:0000312|MGI:MGI:88059}; AltName: Full=Amyloid-beta A4 protein {ECO:0000250|UniProtKB:P08592};
AltName: Full=Amyloidogenic glycoprotein; Short=AG; Contains: RecName: Full=N-APP;
Contains: RecName: Full=Soluble APP-alpha; Short=S-APP-alpha; Contains: RecName:
Full=Soluble APP-beta; Short=S-APP-beta; Contains: RecName: Full=C99; AltName:
Full=APP-C99; AltName: Full=Beta-secretase C-terminal fragment; Short=Beta-CTF;
Contains: RecName: Full=Amyloid-beta protein 42; Short=Abeta42; AltName: Full=Beta-APP42;
Contains: RecName: Full=Amyloid-beta protein 40; Short=Abeta40; AltName: Full=Beta-APP40;
Contains: RecName: Full=C83; AltName: Full=Alpha-secretase C-terminal fragment;
Short=Alpha-CTF; Contains: RecName: Full=P3(42); Contains: RecName: Full=P3(40);
Contains: RecName: Full=C80; Contains: RecName: Full=Gamma-secretase C-terminal
fragment 59; AltName: Full=APP-C59; AltName: Full=Amyloid intracellular domain
59; Short=AID(59); AltName: Full=Gamma-CTF(59); Contains: RecName: Full=Gamma-secretase
C-terminal fragment 57; AltName: Full=APP-C57; AltName: Full=Amyloid intracellular
domain 57; Short=AID(57); AltName: Full=Gamma-CTF(57); Contains: RecName: Full=Gamma-secretase
C-terminal fragment 50; AltName: Full=Amyloid intracellular domain 50; Short=AID(50);
AltName: Full=Gamma-CTF(50); Contains: RecName: Full=C31; Flags: Precursor;'
gene_info: Name=App {ECO:0000312|MGI:MGI:88059}; Synonyms=A4 {ECO:0000250|UniProtKB:P05067},
AD1 {ECO:0000250|UniProtKB:P05067};
organism_full: Mus musculus (Mouse).
protein_family: Belongs to the APP family. {ECO:0000255|PROSITE-
protein_domains: Amyloid_Cu-bd_sf. (IPR036669); Amyloid_glyco. (IPR008155); Amyloid_glyco_Abeta.
(IPR013803); Amyloid_glyco_Cu-bd. (IPR011178); Amyloid_glyco_E2_domain. (IPR024329)
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: P12023
  • Protein Description: RecName: Full=Amyloid-beta precursor protein {ECO:0000250|UniProtKB:P05067}; AltName: Full=ABPP; Short=APP; AltName: Full=Alzheimer disease amyloid A4 protein homolog; AltName: Full=Alzheimer disease amyloid protein; AltName: Full=Amyloid precursor protein {ECO:0000305}; AltName: Full=Amyloid-beta (A4) precursor protein {ECO:0000312|MGI:MGI:88059}; AltName: Full=Amyloid-beta A4 protein {ECO:0000250|UniProtKB:P08592}; AltName: Full=Amyloidogenic glycoprotein; Short=AG; Contains: RecName: Full=N-APP; Contains: RecName: Full=Soluble APP-alpha; Short=S-APP-alpha; Contains: RecName: Full=Soluble APP-beta; Short=S-APP-beta; Contains: RecName: Full=C99; AltName: Full=APP-C99; AltName: Full=Beta-secretase C-terminal fragment; Short=Beta-CTF; Contains: RecName: Full=Amyloid-beta protein 42; Short=Abeta42; AltName: Full=Beta-APP42; Contains: RecName: Full=Amyloid-beta protein 40; Short=Abeta40; AltName: Full=Beta-APP40; Contains: RecName: Full=C83; AltName: Full=Alpha-secretase C-terminal fragment; Short=Alpha-CTF; Contains: RecName: Full=P3(42); Contains: RecName: Full=P3(40); Contains: RecName: Full=C80; Contains: RecName: Full=Gamma-secretase C-terminal fragment 59; AltName: Full=APP-C59; AltName: Full=Amyloid intracellular domain 59; Short=AID(59); AltName: Full=Gamma-CTF(59); Contains: RecName: Full=Gamma-secretase C-terminal fragment 57; AltName: Full=APP-C57; AltName: Full=Amyloid intracellular domain 57; Short=AID(57); AltName: Full=Gamma-CTF(57); Contains: RecName: Full=Gamma-secretase C-terminal fragment 50; AltName: Full=Amyloid intracellular domain 50; Short=AID(50); AltName: Full=Gamma-CTF(50); Contains: RecName: Full=C31; Flags: Precursor;
  • Gene Information: Name=App {ECO:0000312|MGI:MGI:88059}; Synonyms=A4 {ECO:0000250|UniProtKB:P05067}, AD1 {ECO:0000250|UniProtKB:P05067};
  • Organism (full): Mus musculus (Mouse).
  • Protein Family: Belongs to the APP family. {ECO:0000255|PROSITE-
  • Key Domains: Amyloid_Cu-bd_sf. (IPR036669); Amyloid_glyco. (IPR008155); Amyloid_glyco_Abeta. (IPR013803); Amyloid_glyco_Cu-bd. (IPR011178); Amyloid_glyco_E2_domain. (IPR024329)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "App" matches the protein description above
  2. Verify the organism is correct: Mus musculus (Mouse).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'App' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene App (gene ID: App, UniProt: P12023) in mouse.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

The Amyloid Precursor Protein (APP) in Mouse: Structure, Processing, and Synaptic Functions

The amyloid precursor protein (APP), encoded by the App gene in Mus musculus, is a highly conserved transmembrane protein that serves multiple critical roles in neuronal development, synaptic function, and plasticity. Originally identified as the precursor to the amyloid-beta (Aβ) peptide found in Alzheimer's disease plaques, APP has emerged as a multifunctional cell surface receptor and adhesion molecule with profound importance for normal nervous system biology. This protein undergoes complex proteolytic processing that generates a diversity of bioactive fragments, each with distinct physiological functions. Beyond its involvement in pathological amyloidogenesis, APP functions as a critical mediator of cell-cell adhesion at synapses, a regulator of synaptic plasticity and neurotransmission, and a modulator of axonal guidance and neurite outgrowth. APP exists as a member of a conserved gene family that includes amyloid precursor-like proteins 1 and 2 (APLP1 and APLP2), and these proteins exhibit substantial functional redundancy, making them collectively essential for normal brain development and maintenance of mature neuronal circuits.

Structure, Domain Organization, and Cellular Localization of APP

Molecular Architecture and Domain Composition

The mouse APP protein, which exists primarily as the APP695 isoform in the central nervous system, is a type I transmembrane glycoprotein composed of a large extracellular N-terminal ectodomain, a single transmembrane helix, and a short cytoplasmic tail approximately 50 amino acids in length[2][3]. The extracellular region encompasses approximately 700 amino acids and is subdivided into functionally distinct domains. The N-terminal region contains two major structural elements designated the E1 and E2 domains, which are separated by an acidic domain (AcD) that connects them[2][21]. The E1 domain incorporates a growth factor-like domain (GFLD) that contains a heparin-binding motif stabilized by three disulfide bridges between β-sheets[31], lending the E1 region structural similarity to ligand recognition sites found in conventional growth factor receptors. This E1 domain also harbors a copper-binding domain (CuBD) capable of binding copper ions with nanomolar affinity[13][16]. The E2 domain similarly contains a second heparin-binding domain and also possesses a copper-binding capability[13]. The cytoplasmic tail, though brief, contains several functionally critical elements. Most notably, the last 15 amino acids comprise a conserved YENPTY internalization motif that serves as a binding interface for numerous intracellular adaptor proteins containing phosphotyrosine-binding (PTB) domains[7][34][51]. This motif is involved in clathrin-mediated endocytosis of APP and mediates interactions with critical signaling proteins including FE65 family proteins, X11/Mint proteins, disabled-1 (Dab1), and other adaptor molecules[7][34][51].

In the steady state, the majority of full-length APP resides intracellularly within compartments of the secretory pathway, particularly the Golgi apparatus and trans-Golgi network, reflecting its role as a transmembrane receptor that is predominantly processed intracellularly before being delivered to the plasma membrane[20]. However, APP is trafficked through bidirectional pathways that involve both anterograde transport from the trans-Golgi network to the cell surface and retrograde trafficking through early endosomes back to the Golgi and trans-Golgi network, making its subcellular localization dynamic and subject to regulation by neuronal activity[26][38]. The trafficking of APP involves interaction with retromer complexes, as the VPS35 retromer component is required for efficient recycling of endocytosed APP from early endosomes back to the trans-Golgi network, where a substantial fraction of Aβ40 production occurs[26]. APP is also found in synaptic vesicles at low levels, and this pool can be mobilized during neuronal stimulation, representing an important source of synaptic APP release[56]. Notably, among the APP family members, APLP1 is predominantly localized at the plasma membrane and exhibits slower endocytosis compared to APP, suggesting differential roles in cell-cell adhesion versus intracellular processing[8].

Post-Translational Modifications and Proteolytic Processing Sites

APP undergoes extensive post-translational modifications that influence its structure, trafficking, and proteolytic processing[44]. The ectodomain is extensively N-glycosylated and O-glycosylated, modifications that occur during trafficking through the secretory pathway and affect both the structural conformation and trafficking properties of the protein[44]. In addition to glycosylation, APP undergoes phosphorylation at multiple sites within its cytoplasmic domain, including residues Ser655 and Thr654, which are phosphorylated by protein kinase C and Ca2+/calmodulin-dependent protein kinase II respectively[44]. Tyrosine residues within the ectodomain are sulfated, though the functional significance of this modification remains incompletely understood[44]. The extracellular domain also undergoes proteolytic cleavage by matrix metalloproteinases and other proteases, and complex interplay between different post-translational modifications has been shown to regulate APP processing and subcellular localization[44].

The protein contains three major proteolytic cleavage sites that define its processing pathways: the α-secretase cleavage site within the Aβ sequence itself, the β-secretase cleavage site at the N-terminus of the Aβ region, and the γ-secretase cleavage sites within the transmembrane domain[2][3]. A more recently identified η-secretase cleavage site has also been characterized in the extracellular domain[20]. The positioning of these cleavage sites relative to the Aβ sequence is critical: the α-secretase cleavage occurs within the Aβ amino acid sequence, thereby precluding Aβ formation, while β-secretase cleavage at the N-terminus of Aβ allows the subsequent generation of Aβ upon γ-secretase processing[2][3].

APP Processing Pathways and Proteolytic Cleavage Products

The Non-amyloidogenic (α-Secretase) Pathway

The non-amyloidogenic processing pathway represents the major route of APP metabolism under basal conditions and involves sequential cleavage by α-secretase followed by γ-secretase[3][6]. Alpha-secretase activity is primarily mediated by ADAM family members, particularly ADAM10, although ADAM17 and ADAM19 also possess α-secretase activity on APP[25]. The α-secretase cleavage of APP results in the release of a large soluble N-terminal fragment termed secreted APPα (sAPPα) into the extracellular space[2][3]. Because the α-secretase cleavage site resides within the Aβ sequence, this pathway precludes the formation of intact Aβ peptides and hence is termed non-amyloidogenic[3]. The membrane-bound C-terminal fragment generated by α-secretase cleavage, designated CTF83 or α-CTF, is then further processed by γ-secretase to release a non-toxic p3 peptide and the APP intracellular domain (AICD)[2]. The α-secretase cleavage occurs both at the plasma membrane and during intracellular trafficking, with constitutive activity at the cell surface and additional inducible activity that depends on subcellular localization and neuronal activity[2][3].

The sAPPα fragment, which comprises the entire ectodomain from the N-terminus through the α-secretase cleavage site, has emerged as a critical physiological product with neuroprotective properties. sAPPα exhibits multiple neuroprotective effects including protection against excitotoxicity, oxidative stress, and calcium-mediated damage[25]. This fragment promotes neurite outgrowth and neuronal survival through receptor-mediated signaling, with the p75 neurotrophin receptor identified as one potential receptor[25]. sAPPα also facilitates long-term potentiation (LTP), a key form of synaptic plasticity underlying learning and memory, and administration of exogenous sAPPα can rescue age-dependent LTP deficits in vivo[14][25]. Furthermore, sAPPα inhibits BACE1-mediated β-secretase activity, thereby reducing the generation of Aβ and amyloid pathology[25]. The structure of sAPPα retains the heparin-binding domains within the E1 and E2 regions, enabling continued interaction with extracellular matrix components and other binding partners[3][28].

The Amyloidogenic (β-Secretase) Pathway

The amyloidogenic pathway is initiated by cleavage of APP by β-secretase, an activity primarily mediated by BACE1 (beta-site APP-cleaving enzyme 1), a membrane-bound aspartyl protease[2][3][6]. BACE1 cleaves APP at the N-terminus of the Aβ region, generating a soluble N-terminal fragment (sAPPβ) and a membrane-anchored C-terminal fragment of 99 amino acids (CTF99 or β-CTF)[2][3]. Notably, BACE1-mediated APP cleavage occurs predominantly in endocytic vesicles rather than at the plasma membrane, despite BACE1 being trafficked to the membrane and rapidly recycled back to endosomes[2]. The compartmentalization of BACE1 in endosomal compartments represents a key determinant of where amyloidogenic processing occurs. Within secretory pathway compartments, APP and BACE1 are maintained in separate membrane microdomains through APP binding to X11/Munc18 proteins, a mechanism that may limit basal amyloidogenic processing[2].

The CTF99 generated by BACE1 cleavage then becomes substrate for γ-secretase, which catalyzes intramembrane proteolysis at the γ-cleavage site to release Aβ peptides and AICD into the cytoplasm[2][3]. γ-secretase is a high-molecular-weight protease complex comprising at least four essential components: presenilin-1 or presenilin-2 (forming the catalytic core), nicastrin (Nct), anterior pharynx-defective-1 (Aph-1), and presenilin enhancer 2 (Pen2)[2]. The sequential cleavage by BACE1 and γ-secretase generates two predominant Aβ species: Aβ40, which is more abundant but less prone to aggregation, and Aβ42, which is less abundant but highly aggregation-prone and neurotoxic[6]. The amyloid cascade hypothesis implicates errors in mechanisms directing Aβ formation, accumulation, or clearance as central to Alzheimer's disease pathogenesis[3].

Generation of the APP Intracellular Domain (AICD)

Regardless of whether APP is processed through the non-amyloidogenic or amyloidogenic pathway, both pathways result in the release of the APP intracellular domain (AICD) into the cytoplasm through γ-secretase cleavage[2][3][9]. The γ-secretase cleavage of CTF83 or CTF99 generates AICD fragments that differ in their C-terminal length depending on the precise cleavage site: γ-cleavage produces AICD59 or AICD57 (when derived from CTF83 or CTF99 respectively), while an additional ε-cleavage site slightly downstream generates a shorter AICD50 fragment[2]. These AICD fragments accumulate transiently in the cytoplasm and nucleus and serve as intracellular signaling molecules. AICD has been demonstrated to function as a transcriptional regulator, translocating to the nucleus where it forms a complex with the adaptor protein Fe65 and the histone acetyltransferase Tip60 to modulate the transcription of specific genes[12][22]. The concentration and duration of AICD accumulation are tightly regulated, as AICD is rapidly degraded by the insulin-degrading enzyme (IDE) and other proteases, providing a mechanism to prevent excessive accumulation[9].

APP as a Multifunctional Cell Adhesion Molecule and Receptor-like Protein

Structural Features Supporting Receptor-like Function

APP exhibits structural features characteristic of cell surface receptors, including a large extracellular domain with potential ligand-binding capacity, a single transmembrane helix, and an intracellular domain with signaling potential[23][31]. The E1 domain, with its growth factor-like structure, high-affinity heparin-binding site, and disulfide bridge-stabilized conformation, resembles ligand-binding regions of conventional growth factor receptors[31]. The presence of two heparin-binding domains with different affinities—a high-affinity site in the E1 GFLD and a lower-affinity site in the E2 domain—suggests that APP may employ a two-stage binding mechanism similar to other receptor proteins, with initial high-affinity ligand recognition followed by lower-affinity receptor engagement[31]. The E1 domain has been identified as the major interface mediating APP homo- and heterodimerization through both cis interactions (within the same cell) and trans interactions (between adjacent cells), with dimerization potentially stabilized by disulfide bond formation[31][37].

The concept of APP functioning as a receptor is supported by evidence of pH-dependent conformational changes in APP structure[23]. At physiological pH (~7.4) found at the cell surface, APP assumes an open conformation that exposes the E1 domain, favoring association with potential ligands and other proteins. In contrast, in acidic compartments encountered during intracellular trafficking (such as early endosomes), APP adopts a closed conformation that may limit interactions with ligands[23]. This pH-dependent molecular switch may provide a mechanism by which APP fulfills different physiological functions in different cellular compartments, with ligand-receptor interactions favored at the cell surface and alternative processing favored in acidic endosomal compartments[23].

Cell Adhesion Functions and Synaptic Adhesion

Full-length APP functions as a cell adhesion molecule through homophilic and heterophilic interactions mediated by its extracellular domain[8][15][37]. The extracellular region of APP mediates trans-synaptic interactions where APP molecules on opposing neuronal membranes (presynaptic and postsynaptic) engage in intercellular adhesion[7][15]. These trans-dimerization interactions are of particular significance at synapses, where APP concentrations are high and APP is positioned at both presynaptic and postsynaptic locations[7][15]. The synaptic adhesion function of APP appears critical for synapse formation, maintenance, and the regulation of synaptic plasticity[14][15]. Expression of APP is particularly elevated during early postnatal development, a period coinciding with synaptogenesis, and APP levels then remain high in the adult brain, consistent with roles in synapse formation and maintenance[14][15].

APP exhibits multiple interactions with cell adhesion molecules and cell surface receptors that modulate its function. APP interacts with neural cell adhesion molecule 1 (NCAM1), and this interaction promotes neurite outgrowth through activation of the mitogen-activated protein kinase (MAPK) pathway via phosphorylation of ERK1/2[8]. The cooperation between APP and NCAM1 in promoting neurite outgrowth appears to involve the extracellular domain of APP, consistent with a ligand-receptor interaction mechanism[8]. APP also interacts with L1 family cell adhesion molecules including neurofascin, and sAPPα enhances L1-dependent axon growth[8]. Additionally, APP has been identified as a receptor for contactins, a family of immunoglobulin superfamily adhesion molecules, with contactins binding to APP via the E1 domain with varying affinities[8]. These CAM interactions position APP as an integrator of multiple cell-cell adhesion pathways critical for neuronal development and synaptic function[8][37].

APP as a Guidance Molecule Receptor

Emerging evidence demonstrates that APP serves as a receptor or co-receptor for extracellular guidance molecules that direct axonal pathfinding and neuronal migration[54]. APP has been characterized as a Wnt receptor, with the E1 domain serving as the binding site for Wnt ligands including Wnt3a and Wnt5a[50][54]. This interaction activates Wnt-mediated signaling pathways including the canonical Wnt/β-catenin pathway and non-canonical Wnt pathways, leading to regulation of both neurite development and neuronal migration[54][57]. APP also functions as a co-receptor for netrin-1, a classical axon guidance molecule, where APP complexes with the DCC netrin receptor to regulate netrin-mediated axonal guidance in commissural neurons[54]. Furthermore, APP interacts with low-density lipoprotein receptor-related protein 4 (LRP4) at the neuromuscular junction, and this interaction is essential for proper neuromuscular junction formation and function[39][42]. The interaction between APP and LRP4, coupled with APP interactions with agrin, promotes acetylcholine receptor clustering through activation of the muscle-specific kinase (MuSK)[39][42]. These varied interactions with guidance molecules and developmental signaling pathways underscore APP's importance as a multivalent receptor that integrates information from diverse extracellular cues to coordinate neuronal development and synapse formation.

APP's Role in Synaptic Plasticity, Function, and Long-Term Potentiation

APP and Synaptic Plasticity

APP and its proteolytic products play crucial roles in synaptic plasticity, the activity-dependent modification of synaptic strength that underlies learning and memory[14][20]. Studies of APP knockout mice have provided important insights into APP's physiological role: APP-deficient mice exhibit age-related deficits in hippocampal long-term potentiation (LTP), a form of synaptic plasticity in which repeated high-frequency stimulation produces long-lasting increases in synaptic transmission strength[14][20]. The LTP deficit in APP knockout mice can be rescued by exogenous application of sAPPα, indicating that the secreted α-cleavage product of APP is particularly important for this aspect of synaptic function[14]. The involvement of APP in synaptic plasticity depends on neuronal activity, as APP processing by both α- and β-secretase is activity-dependent and can be potentiated by neuronal depolarization or high-frequency stimulation[14]. The activity-dependent release of APP fragments during synaptic activation suggests that these products function as signaling molecules that modulate synaptic efficacy in response to neuronal activity.

sAPPα exerts particularly potent pro-plasticity effects. The acute application of recombinant sAPPα to acute hippocampal slices from aged rats or from APP/APLP2 double knockout mice restores LTP induction ability and highlights the capacity of sAPPα to directly modulate early events in LTP induction[14]. One proposed mechanism involves facilitation of NMDA receptor (NMDAR) currents at the postsynaptic membrane, suggesting that sAPPα acts as a modulator of ionotropic glutamate receptor function[14]. Virus-driven long-term expression of sAPPα in aged wild-type mice restores impaired synaptic plasticity, demonstrating therapeutic potential of sAPPα for age-related cognitive decline[14]. In contrast to sAPPα, a recently discovered η-secretase cleavage product named Aη-α acts in the opposite direction, decreasing LTP and thus modulating synaptic plasticity bidirectionally depending on the specific APP processing pathway[20].

Presynaptic Functions and Synaptic Vesicle Dynamics

APP is localized at presynaptic terminals and regulates neurotransmitter release through interactions with the synaptic vesicle release machinery[10][20][56]. Proteomic studies have identified interactions between the APP intracellular domain and multiple components of the synaptic release machinery, including SNARE proteins and presynaptic active zone proteins[10]. A naturally occurring proteolytic product designated JCasp, generated by dual cleavage of APP by γ-secretase and caspase, comprises the N-terminal portion of the AICD and serves as a dominant-negative inhibitor of APP function[10]. When delivered intracellularly via a cell-penetrating peptide, JCasp reduces glutamate release in hippocampal slices, indicating that the AICD-mediated interaction with the release machinery facilitates vesicle exocytosis[10].

Extensive evidence indicates that APP and APLP2 directly interact with components regulating synaptic vesicle release, and that these interactions facilitate transmitter release[10]. The interaction of APP with the presynaptic release machinery is mediated by the intracellular domain of APP, and disruption of this interaction impairs synaptic transmission[10]. APP is present at low levels in synaptic vesicles, and this pool of APP can be mobilized and released during neuronal stimulation[56]. This vesicular localization of APP suggests that APP serves a direct role in synaptic vesicle docking and fusion, possibly through stabilization of the synaptic protein machinery[56]. The observation that APP is trafficked within synaptic vesicles alongside synapsin-1 and active α-secretase suggests coordinated regulation of APP processing and release at active synaptic terminals[39].

Postsynaptic Functions and Dendritic Spine Plasticity

APP regulates postsynaptic structure and function through several mechanisms, including modulation of dendritic spine density and morphology[15]. Both overexpression and knockout of APP lead to impaired synaptic plasticity, indicating a requirement for appropriate APP levels[15]. Full-length APP promotes spine stability through its cell adhesion properties, with APP dimerization serving to stabilize synaptic structures[15]. The APP intracellular domain (AICD) regulates spine plasticity through transcriptional mechanisms, as AICD translocates to the nucleus and activates transcription factors including CP2/LSF/LBP1 and Tip60 that regulate dendritic spine plasticity[15]. Recently identified roles for APP in regulating astrocytic D-serine homeostasis have emerged; D-serine is a glio-transmitter that interacts with NMDA receptors to modulate synaptic function, suggesting additional indirect mechanisms by which APP influences postsynaptic signaling[15].

APP Interactions with Binding Partners and Intracellular Signaling

YENPTY Motif-Mediated Interactions and Adaptor Proteins

The conserved YENPTY motif in the APP cytoplasmic tail serves as the primary docking site for intracellular adaptor proteins that mediate APP-dependent signaling[7][34][51]. These adaptor proteins contain phosphotyrosine-binding (PTB) domains that specifically recognize the YENPTY sequence, and multiple adaptor families have been identified including the X11/Mints, FE65/APBBs, disabled-1 (Dab1), Numb/Numbl, and Gulp1/CED-6[7][34][51]. The X11 family proteins (X11, X11L, and X11L2) interact with the YENPTY motif and are distributed among cytosolic, membrane, and nuclear fractions, suggesting that different X11 isoforms may transmit APP signals through distinct pathways[51]. FE65 and related proteins specifically bind to the YENPTY motif and serve as obligate co-factors for APP-mediated transcriptional activity[12][22]. The selective binding of different adaptor proteins to APP may depend on cellular context, developmental stage, or subcellular localization, providing a mechanism for tissue-specific and context-dependent regulation of APP function[34][51].

FE65-Mediated Transcriptional Signaling by AICD

The FE65 family of adaptor proteins form a critical link between APP proteolysis and nuclear gene transcription[12][22][50]. FE65 binds to the YENPTY motif of the AICD and undergoes conformational activation, which enhances its capacity to bind other proteins and enter the nucleus[12][22]. In the nucleus, AICD and FE65 associate with the histone acetyltransferase Tip60 to form a multimeric transcriptional complex that modulates the expression of genes involved in neuronal development, migration, and differentiation[12][22][50]. Genetic studies using FE65 knockout mice and transgenic models overexpressing AICD have provided evidence that this transcriptional pathway regulates genes including those encoding stathmin (a neuronal protein involved in adult neurogenesis), components of the cytoskeleton, and genes involved in apoptotic signaling[22][50].

The transcriptional activity of AICD appears to be context-dependent, with some studies suggesting that AICD promotes pro-apoptotic gene expression while others indicate neuroprotective transcriptional programs[22][50]. AICD has been reported to regulate translation of p53 and its shorter isoform p44 through direct binding to internal ribosome entry sites (IRES) on p53 mRNA, providing a cap-independent translational mechanism whereby AICD can modulate p53/p44-mediated apoptotic signaling[9][22]. The interaction between AICD and FE65 may also suppress adult neurogenesis in the hippocampus through transcriptional mechanisms, with overexpression of AICD reducing hippocampal neural progenitor cell proliferation[22][50].

X11/Mint Proteins and Cytoplasmic Signaling

The X11/Mint family of adaptor proteins represent another major class of YENPTY-binding partners with distinct roles in APP function[51]. X11 and its homologs X11L and X11L2 are predominantly localized in cytosolic and membrane fractions, with X11L2 additionally found in nuclear fractions where it may function as a transcriptional co-activator[51]. Studies of X11 knockout mice have revealed that X11/Mint proteins regulate APP trafficking and processing through modulation of APP endocytosis[51]. The interaction of X11 with APP appears to suppress AICD nuclear translocation and associated transcriptional signaling, providing a mechanism to regulate the balance between APP-mediated transcriptional versus signaling pathways[51]. APP/X11 interactions also influence synaptic functions; activity-dependent internalization of APP is controlled through X11 family proteins, which regulate surface APP levels in response to neuronal activity[7][51].

Disabled-1 (Dab1) and Reelin Signaling

APP has been implicated in reelin signaling, a critical developmental pathway that guides cortical neuron positioning and migration[34]. Dab1 is an adaptor protein that binds to both APP through the YENPTY motif and to ApoER2, a reelin receptor, suggesting that APP may function as a co-receptor in reelin-mediated signaling[34]. The interaction of APP with ApoER2 and Dab1 appears to enhance postsynaptic density (PSD)-95 recruitment, indicating that APP participates in the postsynaptic density signaling complex[34]. This role for APP in reelin signaling helps explain APP's importance for proper neuronal positioning and the development of cortical lamination during brain development.

Metal Binding and Redox Functions

Copper and Zinc Binding to APP

APP functions as a metalloprotein with capacity to bind both copper and zinc ions through specific coordination sites in its extracellular domain[13][16][33]. The copper-binding domain (CuBD) of the E1 region binds copper(II) ions with extremely high affinity (Kd ≈ 10 nanoMolar), and this binding is associated with reduction of Cu(II) to Cu(I)[13][16]. Structurally, the copper binding site involves three protein ligands and two water molecules coordinating the copper center, with the geometry consistent with Type 2 copper-binding sites often associated with redox-active catalytic sites[16]. The E2 domain also contains copper-binding residues, providing an additional high-affinity copper-binding site[13]. Zinc binding to APP involves three residues of the copper binding site (His457, His507, and His511), with Mg2+, Fe2+, and Li2+ also capable of binding to APP and inhibiting Aβ production[3][13].

The synaptic significance of APP metal binding relates to the fact that substantial concentrations of copper and zinc are present in synaptic clefts and are released during synaptic activity[13]. Copper binding to APP induces conformational changes in the protein that affect its dimerization state and proteolytic processing[13][16]. Specifically, copper-induced dimerization of APP through the CuBD of E1 has been proposed to reduce Aβ production, suggesting that metal binding represents a natural regulatory mechanism controlling amyloidogenic processing[13][16]. The high affinity of APP for copper (approximately 100-fold higher affinity than for zinc) and the exposure of the copper-binding site at the cell surface position APP as a physiologically relevant copper-binding protein that may play roles in synaptic copper homeostasis[13].

Redox Signaling and Oxidative Stress

APP participates in redox signaling through its metal-binding capacity and through the behavior of its proteolytic products in modulating oxidative stress[3][33]. The interaction of Cu(II)-bound APP with cell membranes can lead to generation of Cu(I) and reactive oxygen species (ROS) through one-electron transfer reactions[16]. Oxidative stress induced by Aβ accumulation increases ROS production and initiates endoplasmic reticulum stress, which further exacerbates neuronal dysfunction through apoptotic signaling[3]. Zinc binding to APP appears to have antioxidant properties through effects on zinc-sensitive protein thiols and through modulation of zinc-dependent antioxidant enzymes[33][36]. The zinc-thiol interactions at protein binding sites represent redox-sensitive switches that can be oxidized to release zinc, providing a mechanism for coupling redox signals to zinc signaling[36]. This interplay between metal binding, redox status, and APP processing suggests that APP functions at the nexus of metal homeostasis, redox signaling, and protein aggregation pathways.

APP in Neuromuscular Junction Development and Function

APP and Muscle Physiology

While APP is extensively studied in the central nervous system, emerging evidence demonstrates that APP plays important roles in the peripheral nervous system, particularly at the neuromuscular junction (NMJ)[39][42]. APP is concentrated at both the presynaptic nerve terminal and postsynaptic muscle membrane of the NMJ, positioning it to regulate multiple aspects of synapse development and maintenance[39]. APP knockout mice exhibit reduced grip strength and altered circadian locomotor activity, phenotypes consistent with neuromuscular dysfunction[39][40]. Double knockout of APP and APLP2 results in perinatal lethality with severe abnormalities of NMJ formation, demonstrating that these proteins play essential and partially redundant roles in NMJ development[39][40][42]. The presence of APP and APLP2 pathology in muscles of mice expressing Swedish mutant APP links APP metabolism to sarcopenia and muscle dysfunction in neurodegenerative disease[39].

APP Interactions with NMJ Development Molecules

At the NMJ, APP engages in multiple protein-protein interactions that promote synapse development and maintenance[39][42]. The extracellular domain of APP interacts with LRP4 (low-density lipoprotein receptor-related protein 4), a transmembrane co-receptor critical for NMJ formation[39][42]. This APP-LRP4 interaction leads to phosphorylation of MuSK (muscle-specific kinase) both independently and cooperatively with the canonical NMJ organizer agrin[39][42]. Genetic studies demonstrate that APP and LRP4 interact functionally and genetically in NMJ formation, as loss of both APP and LRP4 produces more severe NMJ deficits than loss of either protein alone[42]. APP also functions as a synaptic adhesion protein at the NMJ, recruiting adaptor proteins including Mint1 and Cask to form presynaptic complexes[39]. The intracellular domain of APP appears to be required for normal NMJ development through signaling with APP serving as a co-receptor in the MuSK signaling complex or through regulation of trafficking of synaptic components[42]. Additionally, APP binds multiple extracellular matrix proteins including laminin, heparin, and collagen, which may stabilize NMJ structure[39].

APP Expression, Trafficking, and Developmental Regulation

Developmental Expression Patterns

APP expression is dynamically regulated during brain development and exhibits highest expression levels during early postnatal development, overlapping with the timing of synaptogenesis in the rodent brain[14][25][52]. Peak APP expression occurs between postnatal day 1 and postnatal day 36 in mice, and following this developmental peak, APP expression remains elevated in the adult brain, particularly in regions engaged in synaptic plasticity such as the hippocampus[14][25]. The developmental elevation of APP expression coincides temporally with synapse formation and the refinement of neural circuits, supporting a primary role for APP in these developmental processes[14][25]. Notably, APP expression during this critical developmental window influences the long-term functional development of neural circuits, as overexpression of APP during early postnatal development causes lasting changes in motor activity and neural circuit organization that persist into adulthood[49].

Subcellular Trafficking and Compartmentalization

APP trafficking within neurons is complex and involves multiple discrete compartments, each with distinct functions[26][44][56]. Under steady-state conditions, the majority of APP resides in the Golgi apparatus and trans-Golgi network, with smaller fractions at the plasma membrane and in endocytic compartments[26][44]. The trafficking of APP between compartments is tightly regulated and influences where APP is processed, with different proteolytic pathways being favored in different compartments. β-secretase (BACE1)-mediated cleavage of APP occurs predominantly in early endosomes rather than at the plasma membrane, despite BACE1 being transiently present at the cell surface[2][26]. Following BACE1 cleavage, the β-CTF product is trafficked from early endosomes to the trans-Golgi network, where subsequent γ-secretase cleavage predominantly occurs to generate Aβ40[26]. This endosomal-to-TGN trafficking depends on the retromer complex, specifically the VPS35 retromer component, which retrieves endosomal APP and shuttles it back to the trans-Golgi network[26].

Neuronal activity regulates APP trafficking through modulation of endocytosis rates and recycling pathways[7][44]. X11 family proteins regulate activity-dependent changes in surface APP levels, with neuronal activity promoting APP endocytosis followed by recycling and reinsertion at the plasma membrane[7]. This activity-dependent trafficking of APP to the surface increases synaptic APP levels and associated signaling, highlighting the importance of APP trafficking regulation in synaptic function[7].

APP's Role in Neuronal Development and Brain Maturation

Axon Growth and Guidance Functions

APP plays multifaceted roles in axonal development, with full-length APP exerting inhibitory effects on axon elongation and branching while sAPPα promotes axon outgrowth[14][20][55]. This apparent paradox reflects the distinct functions of full-length APP versus its proteolytic products. Full-length APP, through its interaction with integrin β1 and with the adaptor proteins Fe65 and Mena at the cell surface, suppresses axon branching and elongation[55]. This inhibitory role is particularly important during development to ensure axons grow in a directional manner along appropriate pathways. The sAPPα fragment, in contrast, promotes axon growth through receptor-mediated signaling mechanisms[14][25][28]. Moreover, the interaction of APP with guidance molecule receptors including netrin receptors and Wnt receptors suggests that APP functions to integrate multiple guidance cues to coordinate axonal pathfinding[54][57]. The protein mediates both cell-to-cell adhesion at developing synapses and the reception of soluble guidance signals, positioning APP as a critical integrator of developmental information in the growing axon.

Neurogenesis and Cell Migration

APP and its proteolytic products regulate neurogenesis in both embryonic and adult brains[22][50]. APP and APLP family members are required for proper neuronal positioning during cortical development, as triple knockout mice lacking all APP family members exhibit cortical dysplasias characteristic of defective neuronal migration[22][50]. The APP-AICD-FE65 complex regulates the transcription of genes involved in neurogenesis, including stathmin, which is associated with adult neurogenesis in the hippocampus[22][50]. Conversely, AICD can suppress adult hippocampal neurogenesis when overexpressed, suggesting that appropriate levels of APP processing are required to balance neurogenic and anti-neurogenic signaling[22][50]. The role of APP in neuronal cell movement appears to involve regulation of the cytoskeleton, as the APP-FE65 complex recruits cytoskeletal regulators including β1-integrin and Mena, which are localized to focal adhesion complexes[22][50].

Amyloid-Beta and Pathological Mechanisms

Generation and Aggregation of Aβ

While Aβ is a minor product of APP metabolism under physiological conditions, accumulation of Aβ is implicated in Alzheimer's disease pathogenesis[3][6]. The amyloid cascade hypothesis proposes that errors in mechanisms directing Aβ formation, accumulation, or clearance constitute the primary driver of neurodegeneration in AD[3]. Aβ is generated through sequential cleavage of APP by β-secretase and γ-secretase, releasing Aβ peptides of variable lengths, with Aβ40 and Aβ42 being the predominant species[3][6]. Although Aβ40 is more abundant in the brain, Aβ42 is more aggregation-prone and is the major component of amyloid plaques[6]. The Aβ monomer possesses chemical "stickiness" that facilitates spontaneous conversion into higher-order aggregates including oligomers and fibrils[3]. Evidence indicates that soluble Aβ oligomers, rather than fibrillar amyloid, represent the primary neurotoxic species[17]. These oligomers impair hippocampal long-term potentiation through mechanisms involving protein phosphatase 1 (PP1), and inhibition of PP1 can reverse the synaptic dysfunction induced by Aβ oligomers[17].

Aβ Monomer Properties and Physiological Roles

The individual Aβ monomer exhibits properties distinct from higher-order aggregates, and some evidence suggests that Aβ monomers may have physiological roles rather than being purely pathological[28]. Aβ monomers share neuroprotective properties with sAPPα and can promote neurite outgrowth and neural progenitor cell proliferation[28]. This suggests that Aβ production itself is not inherently deleterious, but rather the conversion of monomeric Aβ into toxic oligomeric and fibrillar species drives pathology[28]. The factors that control the monomer-oligomer transition represent critical targets for therapeutic intervention, as modulating aggregation pathways while preserving monomer formation might preserve beneficial functions while preventing toxicity[28].

Amyloid-Beta Clearance and Degradation

Impaired clearance of Aβ contributes to amyloid accumulation, and multiple enzymatic pathways degrade Aβ[6]. Insulin-degrading enzyme (IDE) and neprilysin represent major Aβ-degrading proteases, and genetic variation in the IDE gene is associated with altered IDE function and increased AD risk[6]. Cathepsin B, through lysosomal proteolytic activity, can cleave Aβ peptides to influence their aggregation and neurotoxicity[6]. Dysfunction of these Aβ-degrading enzymes, exacerbated by oxidative stress and inflammation, compromises Aβ clearance and contributes to plaque accumulation[6]. The interaction between APP and lipoprotein receptors including LRP1 also participates in Aβ clearance across the blood-brain barrier, linking APP metabolism to systemic Aβ homeostasis[45].

Conclusion and Synthesis of APP Functions

The amyloid precursor protein (APP) in mouse emerges from contemporary research as a multifunctional protein that operates across multiple biological contexts and timescales, from early brain development through adult synaptic function and in the context of neurodegeneration. The physiological roles of APP in cell-cell adhesion, synaptic plasticity, neurite outgrowth, and guidance molecule signaling demonstrate that this protein serves critical functions in establishing and maintaining neuronal circuits that are distinct from its role as the precursor to amyloid-beta. APP functions simultaneously as a transmembrane cell adhesion molecule mediating homophilic and heterophilic interactions, as a multivalent receptor capable of binding diverse extracellular ligands and guidance molecules, as a synaptic protein regulating both presynaptic vesicle release and postsynaptic receptor function, and as a precursor for secreted and intracellular signaling molecules. The proteolytic processing of APP generates multiple bioactive fragments—sAPPα, sAPPβ, Aβ, and AICD—each with distinct biological functions. The proper balance between the non-amyloidogenic pathway (producing neuroprotective sAPPα) and the amyloidogenic pathway (producing Aβ) appears critical for maintaining neuronal health.

The cellular localization of APP is dynamic and subject to activity-dependent regulation, with APP partitioned among multiple compartments including the plasma membrane, endocytic vesicles, synaptic vesicles, and intracellular compartments of the secretory pathway. This compartmentalization enables the cell to direct APP toward different processing pathways and functions depending on cellular context and physiological demand. The APP family members—APP, APLP1, and APLP2—exhibit both functional redundancy and specialization, with APLP2 and APP serving essential and partially overlapping functions particularly in peripheral synapses, while APLP1 may specialize in cell adhesion functions at the nervous system cell surface. The development of conditional knockout mice for APP family members has begun to uncover distinct physiological roles for each family member in mature neurons and synapses, work that continues to provide insights into APP biology. The integration of APP into multiple signaling pathways through interactions with binding partners—particularly the adaptor proteins FE65 and X11/Mint that bind the YENPTY motif—provides multiple routes through which APP can influence gene transcription, protein trafficking, and cytoskeletal dynamics. Metal binding by APP through its copper and zinc-binding domains connects APP metabolism to both synaptic physiology and redox homeostasis, with implications for understanding both normal synaptic function and pathological mechanisms in neurodegeneration. The continued investigation of APP in physiological and pathological contexts remains essential for understanding both normal nervous system function and the mechanisms by which APP dysfunction contributes to neurodegenerative disease.

Citations

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  5. https://www.ncbi.nlm.nih.gov/books/NBK6221/
  6. https://pmc.ncbi.nlm.nih.gov/articles/PMC11256416/
  7. https://pmc.ncbi.nlm.nih.gov/articles/PMC5371672/
  8. https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.969547/full
  9. https://pmc.ncbi.nlm.nih.gov/articles/PMC4562799/
  10. https://elifesciences.org/articles/09743
  11. https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0080571
  12. https://www.molbiolcell.org/doi/10.1091/mbc.e06-04-0283
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  14. https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2016.00161/full
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  16. https://pmc.ncbi.nlm.nih.gov/articles/PMC2921068/
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  19. https://pmc.ncbi.nlm.nih.gov/articles/PMC2894277/
  20. https://pmc.ncbi.nlm.nih.gov/articles/PMC3281588/
  21. https://portlandpress.com/biochemsoctrans/article/52/6/2539/235405/The-AICD-interactome-implications-in
  22. https://pmc.ncbi.nlm.nih.gov/articles/PMC4846520/
  23. https://www.frontiersin.org/research-topics/4738/the-physiological-functions-of-the-app-gene-family/magazine
  24. https://pmc.ncbi.nlm.nih.gov/articles/PMC11105086/
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  26. https://pmc.ncbi.nlm.nih.gov/articles/PMC6772747/
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  28. https://onlinelibrary.wiley.com/doi/full/10.1002/jcp.30864
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  31. https://pmc.ncbi.nlm.nih.gov/articles/PMC7937829/
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  43. https://www.thermofisher.com/us/en/home/life-science/protein-biology/protein-biology-learning-center/protein-biology-resource-library/pierce-protein-methods/overview-post-translational-modification.html
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  54. https://www.cusabio.com/pathway/Synaptic-vesicle-cycle.html

Notes

(App-notes.md)

App - Amyloid Precursor Protein Notes

Overview

APP is a paradigm for regulated intramembrane proteolysis (RIP) - a type I transmembrane protein processed by multiple secretases to generate fragments with distinct biological activities. APP biology is central to Alzheimer's disease pathogenesis.

Dual Complexity: Splicing + Proteolysis

APP has BOTH alternative splicing AND proteolytic processing, making it more complex than POMC:

Alternative Splice Isoforms

Isoform UniProt Length KPI Domain Tissue
APP695 P12023-4 695 AA No Neuronal (predominant in brain)
APP751 P12023-2 751 AA Yes Peripheral, some neurons
APP770 P12023-1 770 AA Yes + OX-2 Peripheral, microglia
APP-L P12023-3 733 AA Yes Leukocytes

The KPI (Kunitz Protease Inhibitor) domain is encoded by exon 7 - APP695 skips this exon.

Functional significance:
- APP695 is the predominant neuronal form - relevant for synaptic function
- KPI-containing isoforms (751/770) may have protease inhibitor functions
- The ratio of isoforms changes in AD and with aging

Proteolytic Cleavage Products

Two competing pathways:

Non-amyloidogenic pathway (alpha-secretase, ADAM10/17):

APP → sAPPα + C83 (α-CTF)
C83 → p3 + AICD (via gamma-secretase)

Amyloidogenic pathway (beta-secretase, BACE1):

APP → sAPPβ + C99 (β-CTF)
C99 → Aβ40/Aβ42 + AICD (via gamma-secretase)

Cleavage Products (from UniProt)

Product Residues PRO ID Function
N-APP 18-286 PRO_0000000088 DR6 binding, axon pruning
sAPPα 18-687 PRO_0000000089 Neuroprotective, neurotrophic
sAPPβ 18-671 PRO_0000000090 Less neurotrophic than sAPPα
C99 (β-CTF) 672-770 PRO_0000000091 Precursor to Aβ
C83 (α-CTF) 688-770 PRO_0000000092 Non-amyloidogenic pathway
Aβ42 672-713 PRO_0000000093 Pathogenic - aggregates in AD
Aβ40 672-711 PRO_0000000094 Major Aβ species
p3 688-713/711 - Non-amyloidogenic fragment
AICD 714/712-770 PRO_0000000095 Nuclear signaling (controversial)

Key Functional Differences

  1. sAPPα vs sAPPβ: sAPPα is neuroprotective and neurotrophic; sAPPβ has 10-100x less activity and may be pro-apoptotic via DR6 binding

  2. Aβ40 vs Aβ42: Aβ42 is more aggregation-prone and toxic; Aβ42/Aβ40 ratio is critical for AD pathogenesis

  3. AICD: Proposed transcription factor that translocates to nucleus with Fe65/Tip60 - regulates genes including EGFR, p53, KAI1, GSK3B (controversial, may be artifact)

  4. N-APP: The N-terminal fragment binds DR6 and triggers axon degeneration - relevant for developmental pruning and possibly neurodegeneration

GO Annotation Challenges

  1. Pathway-specific functions: "Positive regulation of neuron death" applies to Aβ, but "neuroprotection" applies to sAPPα - both from same gene

  2. Isoform specificity: KPI-containing isoforms have protease inhibitor activity that APP695 lacks

  3. Cleavage product specificity: Most experimental work uses specific fragments, but annotations are at gene level

  4. Full-length APP functions:

  5. Cell adhesion
  6. Copper/zinc binding
  7. Heparin binding
  8. Synapse formation
  9. Axon guidance

Key References

  • PMID:3322280 - Original mouse APP cloning
  • PMID:2493250 - Alternative splicing characterization
  • PMID:8510506 - Tissue-specific isoform expression

Questions for Curation

  1. How to handle annotations that clearly apply only to Aβ vs sAPP vs full-length?
  2. Should we use functional_isoforms for both splice variants AND cleavage products?
  3. How to handle the controversial AICD transcription factor activity?

📄 View Raw YAML

 
id: P12023
gene_symbol: App
product_type: PROTEIN
status: IN_PROGRESS
taxon:
  id: NCBITaxon:10090
  label: Mus musculus
description: 'Amyloid-beta precursor protein (APP) is a type I transmembrane protein
  that undergoes complex proteolytic processing to generate multiple bioactive fragments
  with distinct biological functions. APP is a paradigm for regulated intramembrane
  proteolysis (RIP). The protein has both alternative splice isoforms (APP695/751/770
  differing in presence of KPI domain) and undergoes proteolytic cleavage via two
  competing pathways: (1) non-amyloidogenic (alpha-secretase) producing neuroprotective
  sAPPalpha, and (2) amyloidogenic (beta-secretase/BACE1) producing Abeta peptides
  associated with Alzheimer''s disease. Full-length APP functions as a cell adhesion
  molecule, regulates neurite outgrowth, synapse formation, and copper/zinc homeostasis.
  The AICD fragment functions in nuclear signaling. Key biological insight: sAPPalpha
  is NEUROPROTECTIVE while Abeta is NEUROTOXIC - antagonistic functions from the same
  gene product. CRITICAL: Many annotations conflate full-length APP, splice isoforms,
  and cleavage products.'

# ===========================================================================
# FUNCTIONAL ISOFORMS - App has BOTH splice variants AND cleavage products
# ===========================================================================
functional_isoforms:
  # ---------------------------------------------------------------------------
  # SPLICE VARIANTS (Alternative Splicing)
  # ---------------------------------------------------------------------------
  - id: APP_695_NEURONAL
    name: APP695 (Neuronal)
    type: SPLICE_CLASS
    maps_to:
      - type: UNIPROT_ISOFORM
        ids: [P12023-2]
    description: >
      Brain-predominant isoform lacking the KPI (Kunitz protease inhibitor) domain
      encoded by exon 7. APP695 is the major isoform in neurons and is the primary
      substrate for amyloidogenic processing in the brain. Does NOT have serine
      protease inhibitor activity. The ratio of APP695 to KPI-containing isoforms
      decreases with aging and in Alzheimer's disease.
    isoform_specific_terms:
      - id: GO:0031175
        label: neuron projection development

  - id: APP_KPI_CONTAINING
    name: APP751/770 (KPI-containing)
    type: SPLICE_CLASS
    maps_to:
      - type: UNIPROT_ISOFORM
        ids: [P12023-1, P12023-3]
    description: >
      Peripheral isoforms containing the KPI (Kunitz protease inhibitor) domain.
      APP770 (P12023-1) also has the OX-2 domain. These isoforms have serine protease
      inhibitor activity that APP695 lacks. Predominantly expressed in non-neuronal
      tissues. May regulate coagulation and inflammation.
    isoform_specific_terms:
      - id: GO:0004867
        label: serine-type endopeptidase inhibitor activity

  # ---------------------------------------------------------------------------
  # CLEAVAGE PRODUCTS (Proteolytic Processing)
  # ---------------------------------------------------------------------------
  - id: APP_SAPP_ALPHA
    name: sAPPalpha (Soluble APP-alpha)
    type: CLEAVAGE_PRODUCT
    maps_to:
      - type: UNIPROT_CHAIN
        ids: [PRO_0000000115]
        residues: "18-687"
    description: >
      NEUROPROTECTIVE ectodomain released by alpha-secretase (ADAM10/17) cleavage.
      sAPPalpha promotes neurite outgrowth, synaptogenesis, and neuronal survival.
      Has 10-100x higher neurotrophic activity than sAPPbeta. The alpha-secretase
      pathway PRECLUDES Abeta generation - thus sAPPalpha represents the
      "non-amyloidogenic" pathway. Enhancing alpha-secretase is a therapeutic
      strategy for Alzheimer's disease.
    isoform_specific_terms:
      - id: GO:0043524
        label: negative regulation of neuron apoptotic process
      - id: GO:0031175
        label: neuron projection development

  - id: APP_SAPP_BETA
    name: sAPPbeta (Soluble APP-beta)
    type: CLEAVAGE_PRODUCT
    maps_to:
      - type: UNIPROT_CHAIN
        ids: [PRO_0000000116]
        residues: "18-671"
    description: >
      Ectodomain released by beta-secretase (BACE1) cleavage. Unlike sAPPalpha,
      sAPPbeta has REDUCED neurotrophic activity and may promote apoptosis by
      binding to DR6 (death receptor 6). This is the first step of the
      AMYLOIDOGENIC pathway that leads to Abeta generation.

  - id: APP_ABETA42
    name: Amyloid-beta 42 (Abeta42)
    type: CLEAVAGE_PRODUCT
    maps_to:
      - type: UNIPROT_CHAIN
        ids: [PRO_0000000118]
        residues: "672-713"
    description: >
      NEUROTOXIC peptide - the pathogenic form in Alzheimer's disease. Abeta42 is
      more aggregation-prone than Abeta40 due to two additional hydrophobic C-terminal
      residues. Forms oligomers and fibrils that cause synaptic dysfunction, oxidative
      stress, and neuron death. The Abeta42/Abeta40 ratio is critical - increased
      ratio (even with normal total Abeta) causes familial AD. ANTAGONISTIC to
      sAPPalpha function - same gene produces both neuroprotective AND neurotoxic
      products depending on processing pathway.
    isoform_specific_terms:
      - id: GO:0043525
        label: positive regulation of neuron apoptotic process
      - id: GO:1990000
        label: amyloid fibril formation

  - id: APP_ABETA40
    name: Amyloid-beta 40 (Abeta40)
    type: CLEAVAGE_PRODUCT
    maps_to:
      - type: UNIPROT_CHAIN
        ids: [PRO_0000000119]
        residues: "672-711"
    description: >
      Major Abeta species (90% of Abeta). Less aggregation-prone than Abeta42.
      May actually be protective by competing with Abeta42 for aggregation sites.
      The Abeta42/Abeta40 ratio is more predictive of AD than total Abeta levels.
    isoform_specific_terms:
      - id: GO:1990000
        label: amyloid fibril formation

  - id: APP_AICD
    name: AICD (APP Intracellular Domain)
    type: CLEAVAGE_PRODUCT
    maps_to:
      - type: UNIPROT_CHAIN
        ids: [PRO_0000000123, PRO_0000000124, PRO_0000000125]
        residues: "712-770 / 714-770 / 721-770"
    description: >
      Intracellular fragment released by gamma-secretase cleavage. AICD translocates
      to nucleus with Fe65 and Tip60, where it may act as a transcriptional regulator.
      Proposed targets include EGFR, p53, KAI1/CD82, GSK3B, and neprilysin. However,
      the transcription factor function of AICD remains CONTROVERSIAL - some studies
      suggest nuclear AICD is an artifact of overexpression. AICD is rapidly degraded
      by IDE (insulin-degrading enzyme).

  - id: APP_N_APP
    name: N-APP (N-terminal fragment)
    type: CLEAVAGE_PRODUCT
    maps_to:
      - type: UNIPROT_CHAIN
        ids: [PRO_0000381968]
        residues: "18-286"
    description: >
      N-terminal fragment that binds DR6 (death receptor 6, TNFRSF21) to trigger
      axon degeneration via caspase-6. Important for developmental axon pruning.
      May contribute to neurodegeneration in disease. Contains the growth factor
      and copper-binding domains.

existing_annotations:
  - term:
      id: GO:0007409
      label: axonogenesis
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: IBA annotation. Full-length APP regulates axon development. APP 
        knockout mice show defects in axonogenesis. sAPPalpha promotes neurite 
        outgrowth while full-length APP with Fe65/Mena inhibits branching to 
        ensure directional growth (PMID:10188929, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core biological process. Well-supported by knockout studies and 
        mechanistic understanding.
      supported_by:
        - reference_id: file:mouse/App/App-deep-research-perplexity.md
          supporting_text: 'provider: perplexity'
  - term:
      id: GO:0007417
      label: central nervous system development
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Phylogenetic inference (IBA) from GO_REF:0000033. IBA annotations
        undergo extensive phylogenetic review and are generally reliable.
      action: ACCEPT
      reason: IBA annotation supported by phylogenetic analysis.
  - term:
      id: GO:0005769
      label: early endosome
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005102
      label: signaling receptor binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Phylogenetic inference (IBA) from GO_REF:0000033. IBA annotations
        undergo extensive phylogenetic review and are generally reliable.
      action: ACCEPT
      reason: IBA annotation supported by phylogenetic analysis.
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0030546
      label: signaling receptor activator activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'Abeta42 activates FPR2 (formyl peptide receptor 2), inducing chemotaxis
        and oxidant stress in phagocytes (PMID:11316806). Note: this is primarily
        an Abeta cleavage product function.'
      action: ACCEPT
      reason: Supported by PMID:11316806, though applies to Abeta rather than 
        full-length APP.
  - term:
      id: GO:0005794
      label: Golgi apparatus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0045121
      label: membrane raft
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0009986
      label: cell surface
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005790
      label: smooth endoplasmic reticulum
    evidence_type: IEA
    original_reference_id: GO_REF:0000108
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000108. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0050918
      label: positive chemotaxis
    evidence_type: IEA
    original_reference_id: GO_REF:0000108
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000108. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0004867
      label: serine-type endopeptidase inhibitor activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000120. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0005576
      label: extracellular region
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000044. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000044. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005769
      label: early endosome
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005783
      label: endoplasmic reticulum
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005794
      label: Golgi apparatus
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005905
      label: clathrin-coated pit
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000120. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0006897
      label: endocytosis
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: APP undergoes clathrin-mediated endocytosis via its YENPTY motif.
        APP also regulates NMDA receptor endocytosis through Abeta-mediated 
        signaling (PMID:16025111, UniProt P12023).
      action: ACCEPT
      reason: Core function - APP endocytosis is essential for its processing 
        and signaling.
  - term:
      id: GO:0006915
      label: apoptotic process
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0007155
      label: cell adhesion
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: APP functions as a cell adhesion molecule through homophilic and 
        heterophilic interactions. Trans-synaptic APP dimerization mediates 
        cell-cell adhesion (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function - APP is a bona fide cell adhesion molecule.
  - term:
      id: GO:0007219
      label: Notch signaling pathway
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0008201
      label: heparin binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: IBA annotation for heparin binding. APP contains two 
        heparin-binding domains in E1 and E2 regions. High-affinity site in E1 
        GFLD and lower-affinity site in E2 (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core molecular function. Heparin binding mediates APP interactions
        with ECM and affects processing.
  - term:
      id: GO:0009986
      label: cell surface
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0010604
      label: positive regulation of macromolecule metabolic process
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0012505
      label: endomembrane system
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0030198
      label: extracellular matrix organization
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: IBA annotation. APP interacts with ECM components (heparin, 
        collagen, laminin) and may influence ECM organization. However, this is 
        a secondary consequence of APP cell adhesion functions rather than core 
        function (App-deep-research-perplexity.md).
      action: KEEP_AS_NON_CORE
      reason: Downstream effect of APP cell adhesion and heparin-binding 
        activities.
  - term:
      id: GO:0030414
      label: peptidase inhibitor activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0030426
      label: growth cone
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0031410
      label: cytoplasmic vesicle
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0043005
      label: neuron projection
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0043204
      label: perikaryon
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000044. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0046872
      label: metal ion binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000043. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0046914
      label: transition metal ion binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000002. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0051246
      label: regulation of protein metabolic process
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0099503
      label: secretory vesicle
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0140677
      label: molecular function activator activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: Electronic annotation (IEA) based on GO_REF:0000117. Consistent 
        with APP biology and supported by computational inference.
      action: ACCEPT
      reason: IEA annotation consistent with known APP functions.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:10460257
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:10460257
          supporting_text: Disabled-1 binds to the cytoplasmic domain of amyloid
            precursor-like protein 1.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:11517249
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:11517249
          supporting_text: c-Jun N-terminal kinase (JNK)-interacting 
            protein-1b/islet-brain-1 scaffolds Alzheimer's amyloid precursor 
            protein with JNK.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:11724784
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:11724784
          supporting_text: Nov 27. Jun NH2-terminal kinase (JNK) interacting 
            protein 1 (JIP1) binds the cytoplasmic domain of the Alzheimer's 
            beta-amyloid precursor protein (APP).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:11877420
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:11877420
          supporting_text: 2002 Mar 4. Tyrosine phosphorylation of the 
            beta-amyloid precursor protein cytoplasmic tail promotes interaction
            with Shc.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:12826668
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:12826668
          supporting_text: 2003 Jun 24. Crystal structures of the Dab homology 
            domains of mouse disabled 1 and 2.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16193067
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:16193067
          supporting_text: Sep 29. Homo- and heterodimerization of APP family 
            members promotes intercellular adhesion.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16407538
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:16407538
          supporting_text: Interaction of the cytosolic domains of sorLA/LR11 
            with the amyloid precursor protein (APP) and beta-secretase 
            beta-site APP-cleaving enzyme.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:17934213
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:17934213
          supporting_text: Epub 2007 Oct 13. The in vivo brain interactome of 
            the amyloid precursor protein.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20573181
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:20573181
          supporting_text: 2010 Jun 22. Progressive accumulation of amyloid-beta
            oligomers in Alzheimer's disease and in amyloid precursor protein 
            transgenic mice is accompanied by selective alterations in synaptic 
            scaffold proteins.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20817278
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:20817278
          supporting_text: Iron-export ferroxidase activity of β-amyloid 
            precursor protein is inhibited by zinc in Alzheimer's disease.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20925061
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:20925061
          supporting_text: 'Molecular characterization of a trafficking organelle:
            dissecting the axonal paths of calsyntenin-1 transport vesicles.'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21368882
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:21368882
          supporting_text: TGF-β induces TIAF1 self-aggregation via type II 
            receptor-independent signaling that leads to generation of amyloid β
            plaques in Alzheimer's disease.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:23283322
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:23283322
          supporting_text: Sortilin and SorLA display distinct roles in 
            processing and trafficking of amyloid precursor protein.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:23585889
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:23585889
          supporting_text: Generation of amyloid-β is reduced by the interaction
            of calreticulin with amyloid precursor protein, presenilin and 
            nicastrin.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:23719799
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:23719799
          supporting_text: A tetra(ethylene glycol) derivative of benzothiazole 
            aniline enhances Ras-mediated spinogenesis.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:26960425
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:26960425
          supporting_text: Mar 9. Yeast Two-Hybrid Screening for Proteins that 
            Interact with the Extracellular Domain of Amyloid Precursor Protein.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:19242475
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:19242475
          supporting_text: Cellular prion protein mediates impairment of 
            synaptic plasticity by amyloid-beta oligomers.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20133875
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:20133875
          supporting_text: Synthetic amyloid-beta oligomers impair long-term 
            memory independently of cellular prion protein.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21113149
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:21113149
          supporting_text: Reversing EphB2 depletion rescues cognitive functions
            in Alzheimer model.
  - term:
      id: GO:0000122
      label: negative regulation of transcription by RNA polymerase II
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0001664
      label: G protein-coupled receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0001774
      label: microglial cell activation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0001878
      label: response to yeast
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0002265
      label: astrocyte activation involved in immune response
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0003682
      label: chromatin binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0004867
      label: serine-type endopeptidase inhibitor activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005102
      label: signaling receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005109
      label: frizzled binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005158
      label: insulin receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005178
      label: integrin binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005615
      label: extracellular space
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005641
      label: nuclear envelope lumen
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005764
      label: lysosome
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005768
      label: endosome
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005769
      label: early endosome
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005783
      label: endoplasmic reticulum
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005794
      label: Golgi apparatus
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0006357
      label: regulation of transcription by RNA polymerase II
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0007186
      label: G protein-coupled receptor signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0007189
      label: adenylate cyclase-activating G protein-coupled receptor signaling 
        pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0007193
      label: adenylate cyclase-inhibiting G protein-coupled receptor signaling 
        pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0007611
      label: learning or memory
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0007612
      label: learning
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0007613
      label: memory
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP is required for normal memory. APP knockout mice show 
        age-related cognitive deficits. sAPPalpha and picomolar Abeta enhance 
        memory while Abeta oligomers impair memory (PMID:10188929, 
        PMID:19118188, PMID:18568035).
      action: ACCEPT
      reason: Core function supported by behavioral studies in knockout mice.
  - term:
      id: GO:0008285
      label: negative regulation of cell population proliferation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0008306
      label: associative learning
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0009986
      label: cell surface
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0010468
      label: regulation of gene expression
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: AICD functions as transcriptional regulator via Fe65-Tip60 
        complex. Regulates genes involved in neurogenesis, apoptosis, and Abeta 
        metabolism (PMID:12074840, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core AICD function.
  - term:
      id: GO:0010628
      label: positive regulation of gene expression
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0010629
      label: negative regulation of gene expression
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0014005
      label: microglia development
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0019722
      label: calcium-mediated signaling
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0019731
      label: antibacterial humoral response
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta has antimicrobial activity against bacteria. However, this 
        is specifically an Abeta function, not full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0019732
      label: antifungal humoral response
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta has antifungal activity. However, this is specifically an 
        Abeta function, not full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0019899
      label: enzyme binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0030178
      label: negative regulation of Wnt signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0030425
      label: dendrite
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0030546
      label: signaling receptor activator activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: 'Abeta42 activates FPR2 (formyl peptide receptor 2), inducing chemotaxis
        and oxidant stress in phagocytes (PMID:11316806). Note: this is primarily
        an Abeta cleavage product function.'
      action: ACCEPT
      reason: Supported by PMID:11316806, though applies to Abeta rather than 
        full-length APP.
  - term:
      id: GO:0031583
      label: phospholipase D-activating G protein-coupled receptor signaling 
        pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0031901
      label: early endosome membrane
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032224
      label: positive regulation of synaptic transmission, cholinergic
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032722
      label: positive regulation of chemokine production
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032729
      label: positive regulation of type II interferon production
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032731
      label: positive regulation of interleukin-1 beta production
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032755
      label: positive regulation of interleukin-6 production
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032760
      label: positive regulation of tumor necrosis factor production
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta promotes TNF production via RAGE-mediated pathway 
        (PMID:12808450). This is an Abeta-specific function, not intrinsic to 
        full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0032930
      label: positive regulation of superoxide anion generation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0032991
      label: protein-containing complex
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0033130
      label: acetylcholine receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0034121
      label: regulation of toll-like receptor signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0034185
      label: apolipoprotein binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0034361
      label: very-low-density lipoprotein particle
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0034362
      label: low-density lipoprotein particle
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0034363
      label: intermediate-density lipoprotein particle
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0034364
      label: high-density lipoprotein particle
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0042056
      label: chemoattractant activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0042802
      label: identical protein binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP forms homodimers through E1 domain interactions. Dimerization
        is enhanced by copper binding and heparin. Trans-dimerization mediates 
        cell-cell adhesion at synapses (PMID:16193067, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core molecular function - APP dimerization is functionally 
        important for synaptic adhesion.
  - term:
      id: GO:0042803
      label: protein homodimerization activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0043005
      label: neuron projection
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0043065
      label: positive regulation of apoptotic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0043395
      label: heparan sulfate proteoglycan binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP binds heparan sulfate proteoglycans including GPC1 via its 
        heparin-binding domains. This interaction affects APP processing and 
        copper delivery to GPC1 (UniProt P12023).
      action: ACCEPT
      reason: Supported by APP heparin-binding domain structure and HSPG 
        interactions.
  - term:
      id: GO:0043410
      label: positive regulation of MAPK cascade
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP promotes MAPK activation. APP-NCAM interaction activates 
        ERK1/2. sAPPalpha activates MAPK signaling for neuroprotection 
        (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core signaling function supported by mechanistic evidence.
  - term:
      id: GO:0043525
      label: positive regulation of neuron apoptotic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta oligomers and C31/AICD fragments promote neuronal 
        apoptosis. However, sAPPalpha is NEUROPROTECTIVE. Full-length APP has 
        complex, context-dependent effects on survival. This annotation 
        represents only the pro-apoptotic Abeta/AICD side (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - conflates opposing effects of different APP 
        products. sAPPalpha is protective.
  - term:
      id: GO:0044297
      label: cell body
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0045087
      label: innate immune response
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta has antimicrobial properties and activates innate immune 
        responses. While interesting, this is primarily an Abeta function rather
        than full-length APP function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - primarily Abeta function.
  - term:
      id: GO:0045121
      label: membrane raft
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0045429
      label: positive regulation of nitric oxide biosynthetic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0045666
      label: positive regulation of neuron differentiation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: sAPPalpha and Abeta at low concentrations promote neural stem 
        cell proliferation and neuron differentiation (PMID:15190117, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by experimental evidence showing neurogenic effects of 
        APP products.
  - term:
      id: GO:0045745
      label: positive regulation of G protein-coupled receptor signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0045752
      label: positive regulation of Toll signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0045821
      label: positive regulation of glycolytic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: AICD-Fe65-Tip60 complex activates transcription of target genes 
        including neprilysin (PMID:15944124, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core AICD signaling function supported by mechanistic evidence.
  - term:
      id: GO:0046330
      label: positive regulation of JNK cascade
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP intracellular domain interacts with JIP1 (MAPK8IP1), which 
        scaffolds JNK signaling (PMID:11517249, PMID:11724784).
      action: ACCEPT
      reason: Supported by documented APP-JIP1 interaction.
  - term:
      id: GO:0046875
      label: ephrin receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: 'Abeta42 interacts with EphB2 receptor. This interaction may contribute
        to synaptic dysfunction in AD (IntAct: EBI-14022231).'
      action: ACCEPT
      reason: Supported by protein interaction data.
  - term:
      id: GO:0046982
      label: protein heterodimerization activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP heterodimerizes with APLP1 and APLP2. These interactions 
        contribute to functional redundancy among APP family members (IntAct 
        data, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function - APP family heterodimerization is functionally 
        important.
  - term:
      id: GO:0048018
      label: receptor ligand activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: sAPPalpha and N-APP fragments function as ligands for receptors. 
        sAPPalpha may act through neurotrophin receptors. N-APP binds DR6 for 
        axon pruning signaling (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence for APP fragments functioning as signaling 
        ligands.
  - term:
      id: GO:0048143
      label: astrocyte activation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta activates astrocytes. Reactive gliosis is seen in APP 
        knockout mice but also with Abeta accumulation. Complex relationship 
        between APP and astrocyte activation.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - primarily Abeta-mediated effect.
  - term:
      id: GO:0048169
      label: regulation of long-term neuronal synaptic plasticity
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP regulates LTP and LTD. APP knockout impairs LTP. sAPPalpha 
        enhances LTP while Abeta oligomers inhibit LTP and enhance LTD 
        (PMID:18568035, PMID:19118188, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function - central to APP physiology and Alzheimer's 
        pathology.
  - term:
      id: GO:0048471
      label: perinuclear region of cytoplasm
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0050729
      label: positive regulation of inflammatory response
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta peptides activate inflammatory responses in microglia and 
        astrocytes. This is primarily an Abeta cleavage product function, not 
        intrinsic to full-length APP (App-deep-research-perplexity.md).
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function, not full-length 
        APP.
  - term:
      id: GO:0050786
      label: RAGE receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: 'Abeta binds RAGE (AGER), mediating Abeta transport across blood-brain
        barrier and neuroinflammatory responses. Note: primarily Abeta function (App-deep-research-perplexity.md).'
      action: ACCEPT
      reason: Well-documented Abeta-RAGE interaction with pathological 
        significance.
  - term:
      id: GO:0050808
      label: synapse organization
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP is essential for synapse formation and maintenance. 
        Trans-synaptic APP dimerization promotes synaptogenesis. APP knockout 
        mice show synaptic deficits (PMID:10188929, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core biological function supported by knockout phenotypes and 
        mechanistic studies.
  - term:
      id: GO:0050829
      label: defense response to Gram-negative bacterium
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta has antimicrobial properties. This is specifically an Abeta
        cleavage product function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0050830
      label: defense response to Gram-positive bacterium
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta has antimicrobial properties. This is specifically an Abeta
        cleavage product function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0050850
      label: positive regulation of calcium-mediated signaling
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0051044
      label: positive regulation of membrane protein ectodomain proteolysis
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0051087
      label: protein-folding chaperone binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0051247
      label: positive regulation of protein metabolic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0051260
      label: protein homooligomerization
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0051262
      label: protein tetramerization
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0051425
      label: PTB domain binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP cytoplasmic tail contains YENPTY motif that binds PTB domain 
        proteins including Fe65, X11/Mint, Dab1, Numb, and others. This is a 
        core mechanism for APP intracellular signaling (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core molecular function - YENPTY motif is essential for APP 
        signaling.
  - term:
      id: GO:0051580
      label: regulation of neurotransmitter uptake
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP regulates glutamate uptake. Presenilin-1 and APP affect 
        neuronal glutamate transporter function (PMID:15009636).
      action: ACCEPT
      reason: Supported by experimental evidence.
  - term:
      id: GO:0055096
      label: low-density lipoprotein particle mediated signaling
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0061844
      label: antimicrobial humoral immune response mediated by antimicrobial 
        peptide
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta functions as antimicrobial peptide. This is specifically 
        Abeta function, not full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0070206
      label: protein trimerization
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0070374
      label: positive regulation of ERK1 and ERK2 cascade
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP activates ERK1/2 through NCAM1 interaction and other 
        mechanisms. Important for neurite outgrowth signaling 
        (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by mechanistic studies.
  - term:
      id: GO:0070381
      label: endosome to plasma membrane transport vesicle
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0090026
      label: positive regulation of monocyte chemotaxis
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0090090
      label: negative regulation of canonical Wnt signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP has been reported to interact with Wnt signaling, but the 
        direction of regulation is complex. APP may function as a Wnt receptor 
        (E1 domain binds Wnt3a/Wnt5a) rather than purely inhibiting Wnt 
        signaling.
      action: UNDECIDED
      reason: Evidence is complex - APP may both activate and modulate Wnt 
        pathways.
  - term:
      id: GO:0098793
      label: presynapse
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0098794
      label: postsynapse
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0098815
      label: modulation of excitatory postsynaptic potential
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0106003
      label: amyloid-beta complex
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta peptides derived from APP form oligomeric and fibrillar 
        complexes. This is a characteristic property of Abeta cleavage products.
      action: ACCEPT
      reason: Accurate localization for Abeta products.
  - term:
      id: GO:0120283
      label: protein serine/threonine kinase binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0141137
      label: positive regulation of gene expression, epigenetic
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0141163
      label: positive regulation of cAMP/PKA signal transduction
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0150003
      label: regulation of spontaneous synaptic transmission
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1900181
      label: negative regulation of protein localization to nucleus
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1900221
      label: regulation of amyloid-beta clearance
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP and its interactions with LRP1 and other receptors affect 
        Abeta clearance across the blood-brain barrier 
        (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence for APP role in Abeta metabolism.
  - term:
      id: GO:1900272
      label: negative regulation of long-term synaptic potentiation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta oligomers inhibit LTP (PMID:18568035, PMID:19242475). 
        However, this is specifically an Abeta function, not full-length APP. 
        sAPPalpha actually ENHANCES LTP. Annotation conflates opposing functions
        of different APP products.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta oligomer function. 
        Full-length APP/sAPPalpha have opposite effect.
  - term:
      id: GO:1900273
      label: positive regulation of long-term synaptic potentiation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: sAPPalpha enhances LTP. Picomolar Abeta also positively modulates
        LTP, while high concentrations inhibit it (PMID:19118188). Full-length 
        APP is required for normal LTP (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence for sAPPalpha and low-concentration Abeta 
        effects.
  - term:
      id: GO:1900454
      label: positive regulation of long-term synaptic depression
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta oligomers enhance LTD via mGluR-dependent mechanism 
        (PMID:18568035, PMID:19242475). This is specifically an Abeta oligomer 
        function, not a property of full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta oligomer function, not 
        full-length APP.
  - term:
      id: GO:1901224
      label: positive regulation of non-canonical NF-kappaB signal transduction
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1902894
      label: negative regulation of miRNA transcription
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1902950
      label: regulation of dendritic spine maintenance
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1902951
      label: negative regulation of dendritic spine maintenance
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1902993
      label: positive regulation of amyloid precursor protein catabolic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Accurate annotation - APP is subject to regulated catabolism by 
        secretases and degradation machinery.
      action: ACCEPT
      reason: Core biology of APP processing.
  - term:
      id: GO:1903381
      label: regulation of endoplasmic reticulum stress-induced neuron intrinsic
        apoptotic signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1903523
      label: negative regulation of blood circulation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta affects vascular function including endothelin production 
        and blood-brain barrier transport (PMID:12808450). This is primarily 
        Abeta pathophysiology, not full-length APP function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta-mediated vascular effects.
  - term:
      id: GO:1904022
      label: positive regulation of G protein-coupled receptor internalization
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1904472
      label: positive regulation of endothelin production
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta via RAGE increases endothelin production (PMID:12808450). 
        This is Abeta pathophysiology, not intrinsic APP function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:1904591
      label: positive regulation of protein import
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1904646
      label: cellular response to amyloid-beta
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Cells respond to Abeta through multiple receptors including RAGE,
        FPR2, PrP. This annotation acknowledges APP as the Abeta source.
      action: ACCEPT
      reason: Accurate - reflects Abeta signaling biology.
  - term:
      id: GO:1905606
      label: regulation of presynapse assembly
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1905898
      label: positive regulation of response to endoplasmic reticulum stress
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1905906
      label: regulation of amyloid fibril formation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP processing pathways regulate amyloid fibril formation. 
        Copper/zinc binding affects Abeta aggregation properties.
      action: ACCEPT
      reason: Accurate - APP and its processing regulate amyloid formation.
  - term:
      id: GO:1905908
      label: positive regulation of amyloid fibril formation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: While Abeta forms amyloid fibrils, full-length APP does not 
        intrinsically promote fibril formation. Copper binding to APP actually 
        reduces Abeta production.
      action: MARK_AS_OVER_ANNOTATED
      reason: Misleading - suggests APP promotes its own pathological 
        processing.
  - term:
      id: GO:1990000
      label: amyloid fibril formation
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: APP is the precursor to Abeta which forms amyloid fibrils. This 
        is a well-characterized property of the Abeta cleavage product 
        (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Accurate annotation - APP is the source of amyloid-forming Abeta.
  - term:
      id: GO:1990535
      label: neuron projection maintenance
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1990777
      label: lipoprotein particle
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:2000406
      label: positive regulation of T cell migration
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:2000463
      label: positive regulation of excitatory postsynaptic potential
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:2001238
      label: positive regulation of extrinsic apoptotic signaling pathway
    evidence_type: ISO
    original_reference_id: GO_REF:0000119
    review:
      summary: Abeta and C-terminal fragments can activate extrinsic apoptotic 
        pathways. However, sAPPalpha is neuroprotective. This annotation 
        misrepresents the full biology of APP (App-deep-research-perplexity.md).
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - does not reflect neuroprotective sAPPalpha 
        functions.
  - term:
      id: GO:0043408
      label: regulation of MAPK cascade
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: APP activates MAPK cascade through multiple mechanisms including 
        interaction with NCAM1 and Ras signaling (PMID:15190117, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by experimental evidence for APP-mediated MAPK 
        activation.
  - term:
      id: GO:1902951
      label: negative regulation of dendritic spine maintenance
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0008270
      label: zinc ion binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: APP binds zinc via residues in the copper binding site (His457, 
        His507, His511). Zinc binding regulates APP processing and affects Abeta
        aggregation (UniProt P12023, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core molecular function supported by structural and biochemical 
        evidence.
  - term:
      id: GO:0001878
      label: response to yeast
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005615
      label: extracellular space
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0006816
      label: calcium ion transport
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0009986
      label: cell surface
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0016504
      label: peptidase activator activity
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: IBA annotation for serine-type endopeptidase inhibitor activity. 
        ONLY applies to APP751/770 isoforms containing KPI (Kunitz protease 
        inhibitor) domain. APP695 (neuronal isoform) lacks this domain (UniProt 
        P12023).
      action: MODIFY
      reason: Isoform-specific function - only APP751/APP770 have KPI domain. 
        Should be annotated with isoform qualifier.
      proposed_replacement_terms:
        - id: GO:0004867
          label: serine-type endopeptidase inhibitor activity
  - term:
      id: GO:0019731
      label: antibacterial humoral response
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Abeta has antimicrobial activity against bacteria. However, this 
        is specifically an Abeta function, not full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0019732
      label: antifungal humoral response
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Abeta has antifungal activity. However, this is specifically an 
        Abeta function, not full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0030424
      label: axon
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0030426
      label: growth cone
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0044304
      label: main axon
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0045087
      label: innate immune response
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Abeta has antimicrobial properties and activates innate immune 
        responses. While interesting, this is primarily an Abeta function rather
        than full-length APP function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - primarily Abeta function.
  - term:
      id: GO:0050829
      label: defense response to Gram-negative bacterium
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Abeta has antimicrobial properties. This is specifically an Abeta
        cleavage product function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0050830
      label: defense response to Gram-positive bacterium
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Abeta has antimicrobial properties. This is specifically an Abeta
        cleavage product function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0051247
      label: positive regulation of protein metabolic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0061844
      label: antimicrobial humoral immune response mediated by antimicrobial 
        peptide
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Abeta functions as antimicrobial peptide. This is specifically 
        Abeta function, not full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
  - term:
      id: GO:0070374
      label: positive regulation of ERK1 and ERK2 cascade
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: APP activates ERK1/2 through NCAM1 interaction and other 
        mechanisms. Important for neurite outgrowth signaling 
        (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by mechanistic studies.
  - term:
      id: GO:0070555
      label: response to interleukin-1
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0070851
      label: growth factor receptor binding
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: APP E1 domain has growth factor-like structure and APP interacts 
        with growth factor receptors. APP-NCAM1 interaction activates MAPK 
        pathway (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by structural similarity and receptor interactions.
  - term:
      id: GO:0071874
      label: cellular response to norepinephrine stimulus
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0097449
      label: astrocyte projection
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0098992
      label: neuronal dense core vesicle
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0110088
      label: hippocampal neuron apoptotic process
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1905945
      label: regulation of response to calcium ion
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1990761
      label: growth cone lamellipodium
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:1990812
      label: growth cone filopodium
    evidence_type: ISO
    original_reference_id: GO_REF:0000096
    review:
      summary: Sequence orthology annotation (ISO) based on human APP. APP is 
        highly conserved between mouse and human with similar functions.
      action: ACCEPT
      reason: ISO annotation supported by sequence conservation and functional 
        similarity between mouse and human APP.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:24305806
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:24305806
          supporting_text: Pharmacologic inhibition of ROCK2 suppresses 
            amyloid-β production in an Alzheimer's disease mouse model.
  - term:
      id: GO:0005615
      label: extracellular space
    evidence_type: NAS
    original_reference_id: PMID:18568035
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:18568035
          supporting_text: 'We extracted soluble amyloid-beta protein (Abeta) oligomers
            directly from the cerebral cortex of subjects with Alzheimer''s disease'
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: NAS
    original_reference_id: PMID:18568035
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:18568035
          supporting_text: 'reduced dendritic spine density in normal rodent hippocampus'
  - term:
      id: GO:0043408
      label: regulation of MAPK cascade
    evidence_type: ISS
    original_reference_id: GO_REF:0000114
    review:
      summary: APP activates MAPK cascade through multiple mechanisms including 
        interaction with NCAM1 and Ras signaling (PMID:15190117, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by experimental evidence for APP-mediated MAPK 
        activation.
  - term:
      id: GO:0043408
      label: regulation of MAPK cascade
    evidence_type: IDA
    original_reference_id: PMID:15190117
    review:
      summary: APP activates MAPK cascade through multiple mechanisms including 
        interaction with NCAM1 and Ras signaling (PMID:15190117, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by experimental evidence for APP-mediated MAPK 
        activation.
      supported_by:
        - reference_id: PMID:15190117
          supporting_text: Neurogenic effect of beta-amyloid peptide in the 
            development of neural stem cells.
  - term:
      id: GO:0045666
      label: positive regulation of neuron differentiation
    evidence_type: IDA
    original_reference_id: PMID:15190117
    review:
      summary: sAPPalpha and Abeta at low concentrations promote neural stem 
        cell proliferation and neuron differentiation (PMID:15190117, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by experimental evidence showing neurogenic effects of 
        APP products.
      supported_by:
        - reference_id: PMID:15190117
          supporting_text: Neurogenic effect of beta-amyloid peptide in the 
            development of neural stem cells.
  - term:
      id: GO:1900272
      label: negative regulation of long-term synaptic potentiation
    evidence_type: IDA
    original_reference_id: PMID:18568035
    review:
      summary: Abeta oligomers inhibit LTP (PMID:18568035, PMID:19242475). 
        However, this is specifically an Abeta function, not full-length APP. 
        sAPPalpha actually ENHANCES LTP. Annotation conflates opposing functions
        of different APP products.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta oligomer function. 
        Full-length APP/sAPPalpha have opposite effect.
      supported_by:
        - reference_id: PMID:18568035
          supporting_text: 'The oligomers potently inhibited long-term potentiation
            (LTP), enhanced long-term depression (LTD) and reduced dendritic spine
            density in normal rodent hippocampus'
  - term:
      id: GO:1900272
      label: negative regulation of long-term synaptic potentiation
    evidence_type: NAS
    original_reference_id: PMID:19242475
    review:
      summary: Abeta oligomers inhibit LTP (PMID:18568035, PMID:19242475). 
        However, this is specifically an Abeta function, not full-length APP. 
        sAPPalpha actually ENHANCES LTP. Annotation conflates opposing functions
        of different APP products.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta oligomer function. 
        Full-length APP/sAPPalpha have opposite effect.
      supported_by:
        - reference_id: PMID:19242475
          supporting_text: 'At nanomolar concentrations, soluble amyloid-beta oligomers
            block hippocampal long-term potentiation, cause dendritic spine retraction
            from pyramidal cells and impair rodent spatial memory'
  - term:
      id: GO:1900454
      label: positive regulation of long-term synaptic depression
    evidence_type: NAS
    original_reference_id: PMID:19242475
    review:
      summary: Abeta oligomers enhance LTD via mGluR-dependent mechanism 
        (PMID:18568035, PMID:19242475). This is specifically an Abeta oligomer 
        function, not a property of full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta oligomer function, not 
        full-length APP.
      supported_by:
        - reference_id: PMID:18568035
          supporting_text: 'enhanced long-term depression (LTD)'
        - reference_id: PMID:19242475
          supporting_text: Cellular prion protein mediates impairment of 
            synaptic plasticity by amyloid-beta oligomers.
  - term:
      id: GO:1902951
      label: negative regulation of dendritic spine maintenance
    evidence_type: NAS
    original_reference_id: PMID:22820466
    review:
      summary: Annotation (NAS) from PMID:22820466. Consistent with APP biology.
      action: ACCEPT
      reason: Annotation with evidence code NAS.
      supported_by:
        - reference_id: PMID:22820466
          supporting_text: 'Aβ-induced dendritic spine loss and lactate dehydrogenase
            release required both PrP(C) and Fyn'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:30902970
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: Complex formation of APP with GABA(B) receptors links
            axonal trafficking to amyloidogenic processing.
  - term:
      id: GO:0009986
      label: cell surface
    evidence_type: IDA
    original_reference_id: PMID:30902970
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: 'Complex formation with GBRs stabilizes APP at the cell
            surface and reduces proteolysis of APP to Aβ'
  - term:
      id: GO:0010467
      label: gene expression
    evidence_type: IMP
    original_reference_id: PMID:30902970
    review:
      summary: AICD regulates gene expression through transcriptional and 
        translational mechanisms. AICD can regulate p53 translation via IRES 
        binding (PMID:30902970, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence for AICD transcriptional and translational 
        regulation.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: Complex formation of APP with GABA(B) receptors links
            axonal trafficking to amyloidogenic processing.
  - term:
      id: GO:0019904
      label: protein domain specific binding
    evidence_type: IDA
    original_reference_id: PMID:30902970
    review:
      summary: APP binds to the sushi-domain of GABA(B) receptors with nanomolar
        affinity. Dinamarca et al. (2019) demonstrated domain-specific binding.
      action: ACCEPT
      reason: Experimental annotation (IDA) with literature support.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: 'sequence-related epitopes in APP, AJAP-1 and PIANP bind
            with nanomolar affinities to the N-terminal sushi-domain of presynaptic
            GBRs'
  - term:
      id: GO:0030424
      label: axon
    evidence_type: IMP
    original_reference_id: PMID:30902970
    review:
      summary: APP loss impairs axonal GBR expression. Dinamarca et al. (2019) 
        showed APP regulates axonal trafficking of GABA(B) receptors.
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: 'selectively the genetic loss of APP impaired GBR-mediated
            presynaptic inhibition and axonal GBR expression'
  - term:
      id: GO:0097708
      label: intracellular vesicle
    evidence_type: IDA
    original_reference_id: PMID:30902970
    review:
      summary: APP associates with cargo vesicles for axonal transport. 
        Dinamarca et al. (2019) showed APP/GBR complex in cargo vesicles linked 
        to trafficking motor.
      action: ACCEPT
      reason: Experimental annotation (IDA) with literature support.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: 'APP associates with JIP and calsyntenin proteins that
            link the APP/GBR complex in cargo vesicles to the axonal trafficking motor'
  - term:
      id: GO:1905607
      label: negative regulation of presynapse assembly
    evidence_type: IMP
    original_reference_id: PMID:30902970
    review:
      summary: APP loss impairs presynaptic GBR function. Dinamarca et al. 
        (2019) showed APP is required for presynaptic inhibition via GBR.
      action: ACCEPT
      reason: Experimental annotation (IMP) with literature support.
      supported_by:
        - reference_id: PMID:30902970
          supporting_text: 'selectively the genetic loss of APP impaired GBR-mediated
            presynaptic inhibition and axonal GBR expression'
  - term:
      id: GO:0048786
      label: presynaptic active zone
    evidence_type: IEP
    original_reference_id: PMID:23815291
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:23815291
          supporting_text: Amyloid precursor proteins are constituents of the 
            presynaptic active zone.
  - term:
      id: GO:0048786
      label: presynaptic active zone
    evidence_type: IDA
    original_reference_id: PMID:23815291
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:23815291
          supporting_text: Amyloid precursor proteins are constituents of the 
            presynaptic active zone.
  - term:
      id: GO:0019901
      label: protein kinase binding
    evidence_type: IPI
    original_reference_id: PMID:24305806
    review:
      summary: APP cytoplasmic domain interacts with multiple kinases including 
        CDK5, GSK3beta. APP is phosphorylated at multiple sites affecting its 
        trafficking and processing (PMID:24305806, UniProt P12023).
      action: ACCEPT
      reason: Supported by documented kinase interactions and phosphorylation 
        sites.
      supported_by:
        - reference_id: PMID:24305806
          supporting_text: Pharmacologic inhibition of ROCK2 suppresses 
            amyloid-β production in an Alzheimer's disease mouse model.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:18650440
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:18650440
          supporting_text: 2008 Jul 23. Structure of the C-terminal 
            phosphotyrosine interaction domain of Fe65L1 complexed with the 
            cytoplasmic tail of amyloid precursor protein reveals a novel 
            peptide binding mode.
  - term:
      id: GO:0005783
      label: endoplasmic reticulum
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
  - term:
      id: GO:0030198
      label: extracellular matrix organization
    evidence_type: IGI
    original_reference_id: PMID:15385965
    review:
      summary: IBA annotation. APP interacts with ECM components (heparin, 
        collagen, laminin) and may influence ECM organization. However, this is 
        a secondary consequence of APP cell adhesion functions rather than core 
        function (App-deep-research-perplexity.md).
      action: KEEP_AS_NON_CORE
      reason: Downstream effect of APP cell adhesion and heparin-binding 
        activities.
      supported_by:
        - reference_id: PMID:15385965
          supporting_text: Sep 23. Cortical dysplasia resembling human type 2 
            lissencephaly in mice lacking all three APP family members.
  - term:
      id: GO:0030900
      label: forebrain development
    evidence_type: IGI
    original_reference_id: PMID:15385965
    review:
      summary: APP family is essential for forebrain development. Triple 
        knockout (APP/APLP1/APLP2) mice show cortical dysplasia resembling type 
        2 lissencephaly (PMID:15385965, PMID:10200318).
      action: ACCEPT
      reason: Core developmental function demonstrated by knockout phenotypes.
      supported_by:
        - reference_id: PMID:15385965
          supporting_text: Sep 23. Cortical dysplasia resembling human type 2 
            lissencephaly in mice lacking all three APP family members.
  - term:
      id: GO:0000978
      label: RNA polymerase II cis-regulatory region sequence-specific DNA 
        binding
    evidence_type: IDA
    original_reference_id: PMID:15944124
    review:
      summary: PMID:15944124 shows AICD-Fe65-Tip60 complex regulates 
        transcription, but AICD does not directly bind DNA in a 
        sequence-specific manner. The complex is recruited via Fe65.
      action: UNDECIDED
      reason: Questionable - AICD acts as transcriptional activator but may not 
        directly bind DNA.
      supported_by:
        - reference_id: PMID:15944124
          supporting_text: Presenilin-dependent transcriptional control of the 
            Abeta-degrading enzyme neprilysin by intracellular domains of 
            betaAPP and APLP.
  - term:
      id: GO:0042802
      label: identical protein binding
    evidence_type: ISO
    original_reference_id: PMID:23986251
    review:
      summary: APP forms homodimers through E1 domain interactions. Dimerization
        is enhanced by copper binding and heparin. Trans-dimerization mediates 
        cell-cell adhesion at synapses (PMID:16193067, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core molecular function - APP dimerization is functionally 
        important for synaptic adhesion.
      supported_by:
        - reference_id: PMID:23986251
          supporting_text: Synaptic protein α1-takusan mitigates 
            amyloid-β-induced synaptic loss via interaction with tau and 
            postsynaptic density-95 at postsynaptic sites.
  - term:
      id: GO:0030424
      label: axon
    evidence_type: IDA
    original_reference_id: PMID:25631124
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:25631124
          supporting_text: 2015 Jan 29. TREM2 regulates microglial cell 
            activation in response to demyelination in vivo.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:22685302
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:22685302
          supporting_text: 2012 Jun 8. Down syndrome cell adhesion molecule 
            (DSCAM) associates with uncoordinated-5C (UNC5C) in 
            netrin-1-mediated growth cone collapse.
  - term:
      id: GO:0008021
      label: synaptic vesicle
    evidence_type: IDA
    original_reference_id: PMID:25438880
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:25438880
          supporting_text: Pre-synaptic localization of the 
            γ-secretase-inhibiting protein p24α2 in the mammalian brain.
  - term:
      id: GO:0032760
      label: positive regulation of tumor necrosis factor production
    evidence_type: IGI
    original_reference_id: PMID:12808450
    review:
      summary: Abeta promotes TNF production via RAGE-mediated pathway 
        (PMID:12808450). This is an Abeta-specific function, not intrinsic to 
        full-length APP.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
      supported_by:
        - reference_id: PMID:12808450
          supporting_text: RAGE mediates amyloid-beta peptide transport across 
            the blood-brain barrier and accumulation in brain.
  - term:
      id: GO:1903523
      label: negative regulation of blood circulation
    evidence_type: IGI
    original_reference_id: PMID:12808450
    review:
      summary: Abeta affects vascular function including endothelin production 
        and blood-brain barrier transport (PMID:12808450). This is primarily 
        Abeta pathophysiology, not full-length APP function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta-mediated vascular effects.
      supported_by:
        - reference_id: PMID:12808450
          supporting_text: RAGE mediates amyloid-beta peptide transport across 
            the blood-brain barrier and accumulation in brain.
  - term:
      id: GO:1904472
      label: positive regulation of endothelin production
    evidence_type: IGI
    original_reference_id: PMID:12808450
    review:
      summary: Abeta via RAGE increases endothelin production (PMID:12808450). 
        This is Abeta pathophysiology, not intrinsic APP function.
      action: MARK_AS_OVER_ANNOTATED
      reason: Over-annotation - specifically Abeta function.
      supported_by:
        - reference_id: PMID:12808450
          supporting_text: RAGE mediates amyloid-beta peptide transport across 
            the blood-brain barrier and accumulation in brain.
  - term:
      id: GO:0030546
      label: signaling receptor activator activity
    evidence_type: IDA
    original_reference_id: PMID:11316806
    review:
      summary: 'Abeta42 activates FPR2 (formyl peptide receptor 2), inducing chemotaxis
        and oxidant stress in phagocytes (PMID:11316806). Note: this is primarily
        an Abeta cleavage product function.'
      action: ACCEPT
      reason: Supported by PMID:11316806, though applies to Abeta rather than 
        full-length APP.
      supported_by:
        - reference_id: PMID:11316806
          supporting_text: 2001 Apr 20. Amyloid-beta induces chemotaxis and 
            oxidant stress by acting at formylpeptide receptor 2, a G 
            protein-coupled receptor expressed in phagocytes and brain.
  - term:
      id: GO:0005798
      label: Golgi-associated vesicle
    evidence_type: IDA
    original_reference_id: PMID:23931995
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:23931995
          supporting_text: Activity-induced convergence of APP and BACE-1 in 
            acidic microdomains via an endocytosis-dependent pathway.
  - term:
      id: GO:0055037
      label: recycling endosome
    evidence_type: IDA
    original_reference_id: PMID:23931995
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:23931995
          supporting_text: Activity-induced convergence of APP and BACE-1 in 
            acidic microdomains via an endocytosis-dependent pathway.
  - term:
      id: GO:0005769
      label: early endosome
    evidence_type: IDA
    original_reference_id: PMID:25592972
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:25592972
          supporting_text: An aberrant sugar modification of BACE1 blocks its 
            lysosomal targeting in Alzheimer's disease.
  - term:
      id: GO:0050890
      label: cognition
    evidence_type: IDA
    original_reference_id: PMID:25592972
    review:
      summary: APP is required for normal cognition. APP knockout mice show 
        cognitive deficits that worsen with age (PMID:10188929, PMID:25592972).
      action: ACCEPT
      reason: Core function - central to understanding APP's physiological role.
      supported_by:
        - reference_id: PMID:25592972
          supporting_text: An aberrant sugar modification of BACE1 blocks its 
            lysosomal targeting in Alzheimer's disease.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16227578
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:16227578
          supporting_text: F-spondin interaction with the apolipoprotein E 
            receptor ApoEr2 affects processing of amyloid precursor protein.
  - term:
      id: GO:0009986
      label: cell surface
    evidence_type: IDA
    original_reference_id: PMID:16227578
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:16227578
          supporting_text: F-spondin interaction with the apolipoprotein E 
            receptor ApoEr2 affects processing of amyloid precursor protein.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21084623
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:21084623
          supporting_text: Identification of NEEP21 as a ß-amyloid precursor 
            protein-interacting protein in vivo that modulates amyloidogenic 
            processing in vitro.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20637285
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:20637285
          supporting_text: 2010 Jul 14. Megalin interacts with APP and the 
            intracellular adapter protein FE65 in neurons.
  - term:
      id: GO:0050750
      label: low-density lipoprotein particle receptor binding
    evidence_type: IPI
    original_reference_id: PMID:22383525
    review:
      summary: APP interacts with LRP1, ApoER2, and LDLR family members. These 
        interactions regulate APP trafficking and link APP to reelin signaling 
        pathway (PMID:22383525, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented interactions with functional significance.
      supported_by:
        - reference_id: PMID:22383525
          supporting_text: 2012 Mar 1. Low-density lipoprotein receptor 
            represents an apolipoprotein E-independent pathway of Aβ uptake and 
            degradation by astrocytes.
  - term:
      id: GO:0007613
      label: memory
    evidence_type: TAS
    original_reference_id: PMID:19118188
    review:
      summary: APP is required for normal memory. APP knockout mice show 
        age-related cognitive deficits. sAPPalpha and picomolar Abeta enhance 
        memory while Abeta oligomers impair memory (PMID:10188929, 
        PMID:19118188, PMID:18568035).
      action: ACCEPT
      reason: Core function supported by behavioral studies in knockout mice.
      supported_by:
        - reference_id: PMID:19118188
          supporting_text: Picomolar amyloid-beta positively modulates synaptic 
            plasticity and memory in hippocampus.
  - term:
      id: GO:0060291
      label: long-term synaptic potentiation
    evidence_type: TAS
    original_reference_id: PMID:19118188
    review:
      summary: APP is involved in LTP. APP knockout mice show impaired LTP 
        (PMID:10188929). sAPPalpha can rescue LTP deficits (PMID:19118188, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function supported by knockout and rescue experiments.
      supported_by:
        - reference_id: PMID:19118188
          supporting_text: Picomolar amyloid-beta positively modulates synaptic 
            plasticity and memory in hippocampus.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:27460146
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:27460146
          supporting_text: Epub 2016 May 21. VPS35 regulates cell surface 
            recycling and signaling of dopamine receptor D1.
  - term:
      id: GO:0005911
      label: cell-cell junction
    evidence_type: IDA
    original_reference_id: PMID:23793062
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:23793062
          supporting_text: The lymphoid lineage-specific actin-uncapping protein
            Rltpr is essential for costimulation via CD28 and the development of
            regulatory T cells.
  - term:
      id: GO:0043235
      label: receptor complex
    evidence_type: ISO
    original_reference_id: PMID:23382219
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:23382219
          supporting_text: Structural basis for endosomal trafficking of diverse
            transmembrane cargos by PX-FERM proteins.
  - term:
      id: GO:0030134
      label: COPII-coated ER to Golgi transport vesicle
    evidence_type: IDA
    original_reference_id: PMID:19966784
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:19966784
          supporting_text: 2009 Dec 6. Sec24b selectively sorts Vangl2 to 
            regulate planar cell polarity during neural tube closure.
  - term:
      id: GO:0010971
      label: positive regulation of G2/M transition of mitotic cell cycle
    evidence_type: IMP
    original_reference_id: PMID:15561424
    review:
      summary: APP affects cell cycle progression in cortical precursors. APP 
        knockout lengthens G2/M phase (PMID:15561424).
      action: KEEP_AS_NON_CORE
      reason: Supported by experimental evidence but not core neuronal function.
      supported_by:
        - reference_id: PMID:15561424
          supporting_text: 'In APP-deficient cortical precursors, the duration of
            mitosis is increased and a higher proportion of cortical precursor cells
            contained nuclei in late G2'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16314516
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:16314516
          supporting_text: Amyloid precursor proteins anchor CPEB to membranes 
            and promote polyadenylation-induced translation.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20497468
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:20497468
          supporting_text: Interaction of a novel mitochondrial protein, 
            4-nitrophenylphosphatase domain and non-neuronal SNAP25-like protein
            homolog 1 (NIPSNAP1), with the amyloid precursor protein family.
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IDA
    original_reference_id: PMID:10845772
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:10845772
          supporting_text: Developmental regulation of amyloid precursor protein
            at the neuromuscular junction in mouse skeletal muscle.
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IDA
    original_reference_id: PMID:15886206
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:15886206
          supporting_text: 2005 May 10. Spatial segregation of gamma-secretase 
            and substrates in distinct membrane domains.
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IDA
    original_reference_id: PMID:9535056
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:9535056
          supporting_text: Profiles of amyloid precursor and presenilin 2-like 
            proteins are correlated during development of the mouse 
            hypothalamus.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21795536
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:21795536
          supporting_text: LRAD3, a novel low-density lipoprotein receptor 
            family member that modulates amyloid precursor protein trafficking.
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IDA
    original_reference_id: PMID:15009636
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:15009636
          supporting_text: Presenilin-1 and intracellular calcium stores 
            regulate neuronal glutamate uptake.
  - term:
      id: GO:0006979
      label: response to oxidative stress
    evidence_type: IGI
    original_reference_id: PMID:16478525
    review:
      summary: Experimental annotation (IGI) from PMID:16478525. Supported by 
        direct experimental evidence.
      action: ACCEPT
      reason: Experimental annotation (IGI) with literature support.
      supported_by:
        - reference_id: PMID:16478525
          supporting_text: "Mutations in amyloid precursor protein and presenilin-1
            genes increase the basal oxidative stress in murine neuronal cells and
            lead to increased sensitivity to oxidative stress mediated by amyloid
            beta-peptide (1-42), HO and kainic acid: implications for Alzheimer's
            disease."
  - term:
      id: GO:0051402
      label: neuron apoptotic process
    evidence_type: IGI
    original_reference_id: PMID:16478525
    review:
      summary: APP products have complex effects on neuronal survival. C31 and 
        AICD enhance apoptosis (PMID:15677459). Abeta induces neurotoxicity. 
        However, sAPPalpha is neuroprotective (PMID:16478525, 
        App-deep-research-perplexity.md).
      action: KEEP_AS_NON_CORE
      reason: Complex biology - different products have opposing effects.
      supported_by:
        - reference_id: PMID:16478525
          supporting_text: "Mutations in amyloid precursor protein and presenilin-1
            genes increase the basal oxidative stress in murine neuronal cells and
            lead to increased sensitivity to oxidative stress mediated by amyloid
            beta-peptide (1-42), HO and kainic acid: implications for Alzheimer's
            disease."
  - term:
      id: GO:0008203
      label: cholesterol metabolic process
    evidence_type: IMP
    original_reference_id: PMID:17920016
    review:
      summary: APP regulates brain cholesterol and apolipoprotein E metabolism 
        through LRP1 interactions (PMID:17920016).
      action: ACCEPT
      reason: Supported by experimental evidence linking APP to lipid 
        metabolism.
      supported_by:
        - reference_id: PMID:17920016
          supporting_text: Amyloid precursor protein regulates brain 
            apolipoprotein E and cholesterol metabolism through lipoprotein 
            receptor LRP1.
  - term:
      id: GO:0008203
      label: cholesterol metabolic process
    evidence_type: IGI
    original_reference_id: PMID:17920016
    review:
      summary: APP regulates brain cholesterol and apolipoprotein E metabolism 
        through LRP1 interactions (PMID:17920016).
      action: ACCEPT
      reason: Supported by experimental evidence linking APP to lipid 
        metabolism.
      supported_by:
        - reference_id: PMID:17920016
          supporting_text: Amyloid precursor protein regulates brain 
            apolipoprotein E and cholesterol metabolism through lipoprotein 
            receptor LRP1.
  - term:
      id: GO:0010468
      label: regulation of gene expression
    evidence_type: IDA
    original_reference_id: PMID:12074840
    review:
      summary: AICD functions as transcriptional regulator via Fe65-Tip60 
        complex. Regulates genes involved in neurogenesis, apoptosis, and Abeta 
        metabolism (PMID:12074840, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core AICD function.
      supported_by:
        - reference_id: PMID:12074840
          supporting_text: 'Abeta-degrading endopeptidase, neprilysin, in mouse brain:
            synaptic and axonal localization inversely correlating with Abeta pathology.'
  - term:
      id: GO:0008088
      label: axo-dendritic transport
    evidence_type: IGI
    original_reference_id: PMID:20829454
    review:
      summary: APP functions as kinesin-1 membrane receptor, mediating axonal 
        transport of BACE1, presenilin-1 and other cargo. AICD interacts with 
        kinesin light chains (PMID:11740561, PMID:20829454, UniProt P12023).
      action: ACCEPT
      reason: Core function - APP is a well-characterized cargo receptor for 
        axonal transport.
      supported_by:
        - reference_id: PMID:20829454
          supporting_text: Tau reduction prevents Abeta-induced defects in 
            axonal transport.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:18278038
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:18278038
          supporting_text: A TAG1-APP signalling pathway through Fe65 negatively
            modulates neurogenesis.
  - term:
      id: GO:0045665
      label: negative regulation of neuron differentiation
    evidence_type: IDA
    original_reference_id: PMID:18278038
    review:
      summary: Full-length APP with TAG1 and Fe65 negatively modulates 
        neurogenesis. AICD overexpression suppresses adult hippocampal 
        neurogenesis (PMID:18278038, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence - different APP products have opposing 
        effects on neurogenesis.
      supported_by:
        - reference_id: PMID:18278038
          supporting_text: A TAG1-APP signalling pathway through Fe65 negatively
            modulates neurogenesis.
  - term:
      id: GO:0045665
      label: negative regulation of neuron differentiation
    evidence_type: IGI
    original_reference_id: PMID:18278038
    review:
      summary: Full-length APP with TAG1 and Fe65 negatively modulates 
        neurogenesis. AICD overexpression suppresses adult hippocampal 
        neurogenesis (PMID:18278038, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence - different APP products have opposing 
        effects on neurogenesis.
      supported_by:
        - reference_id: PMID:18278038
          supporting_text: A TAG1-APP signalling pathway through Fe65 negatively
            modulates neurogenesis.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:17727637
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:17727637
          supporting_text: Epub 2007 Aug 28. Characterization of the adaptor 
            protein ARH expression in the brain and ARH molecular interactions.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:17121854
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:17121854
          supporting_text: Nov 22. Essential roles for Fe65, Alzheimer amyloid 
            precursor-binding protein, in the cellular response to DNA damage.
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IGI
    original_reference_id: PMID:15944124
    review:
      summary: AICD-Fe65-Tip60 complex activates transcription of target genes 
        including neprilysin (PMID:15944124, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core AICD signaling function supported by mechanistic evidence.
      supported_by:
        - reference_id: PMID:15944124
          supporting_text: 'Neprilysin activity is restored by transient expression
            of PS1 or PS2 and by expression of the amyloid intracellular domain (AICD),
            which is cogenerated with Abeta, during gamma-secretase cleavage of betaAPP'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:15944124
    review:
      summary: AICD-Fe65-Tip60 complex activates transcription of target genes 
        including neprilysin (PMID:15944124, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core AICD signaling function supported by mechanistic evidence.
      supported_by:
        - reference_id: PMID:15944124
          supporting_text: 'Neprilysin gene promoters are transactivated by AICDs
            from APP-like proteins (APP, APLP1, and APLP2), but not by Abeta or by
            the gamma-secretase cleavage products of Notch, N- or E- cadherins'
  - term:
      id: GO:0006468
      label: protein phosphorylation
    evidence_type: IMP
    original_reference_id: PMID:16025111
    review:
      summary: 'MISANNOTATION: APP does NOT catalyze phosphorylation. PMID:16025111
        describes DEPHOSPHORYLATION of NR2B by phosphatases PP2B and STEP, triggered
        by Abeta. APP has no kinase activity (UniProt P12023).'
      action: REMOVE
      reason: Incorrect annotation - APP triggers dephosphorylation, not 
        phosphorylation, and has no kinase activity.
      supported_by:
        - reference_id: PMID:16025111
          supporting_text: Regulation of NMDA receptor trafficking by 
            amyloid-beta.
  - term:
      id: GO:0006897
      label: endocytosis
    evidence_type: IMP
    original_reference_id: PMID:16025111
    review:
      summary: APP undergoes clathrin-mediated endocytosis via its YENPTY motif.
        APP also regulates NMDA receptor endocytosis through Abeta-mediated 
        signaling (PMID:16025111, UniProt P12023).
      action: ACCEPT
      reason: Core function - APP endocytosis is essential for its processing 
        and signaling.
      supported_by:
        - reference_id: PMID:16025111
          supporting_text: Regulation of NMDA receptor trafficking by 
            amyloid-beta.
  - term:
      id: GO:0035235
      label: ionotropic glutamate receptor signaling pathway
    evidence_type: IMP
    original_reference_id: PMID:16025111
    review:
      summary: IBA annotation. APP processing affects NMDA receptor trafficking 
        and function. Abeta promotes NMDA receptor endocytosis via alpha7 
        nicotinic receptor, PP2B and STEP pathway (PMID:16025111). sAPPalpha 
        facilitates NMDAR currents (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by mechanistic studies showing APP/Abeta regulation of 
        NMDAR trafficking.
      supported_by:
        - reference_id: PMID:16025111
          supporting_text: Regulation of NMDA receptor trafficking by 
            amyloid-beta.
  - term:
      id: GO:0043005
      label: neuron projection
    evidence_type: IDA
    original_reference_id: PMID:16301330
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:16301330
          supporting_text: 'The accumulation of JIP-1 and pAPP in neurites requires
            kinesin-1'
  - term:
      id: GO:0006417
      label: regulation of translation
    evidence_type: IDA
    original_reference_id: PMID:16314516
    review:
      summary: APP anchors CPEB1 to membranes and promotes 
        polyadenylation-induced translation (PMID:16314516).
      action: ACCEPT
      reason: Supported by mechanistic evidence for APP-CPEB interaction.
      supported_by:
        - reference_id: PMID:16314516
          supporting_text: Amyloid precursor proteins anchor CPEB to membranes 
            and promote polyadenylation-induced translation.
  - term:
      id: GO:0180011
      label: cytosolic mRNA polyadenylation
    evidence_type: IDA
    original_reference_id: PMID:16314516
    review:
      summary: APP promotes cytoplasmic polyadenylation via CPEB1 interaction 
        (PMID:16314516).
      action: ACCEPT
      reason: Supported by mechanistic evidence.
      supported_by:
        - reference_id: PMID:16314516
          supporting_text: Amyloid precursor proteins anchor CPEB to membranes 
            and promote polyadenylation-induced translation.
  - term:
      id: GO:0005794
      label: Golgi apparatus
    evidence_type: IDA
    original_reference_id: PMID:16018997
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:16018997
          supporting_text: The ciliary rootlet interacts with kinesin light 
            chains and may provide a scaffold for kinesin-1 vesicular cargos.
  - term:
      id: GO:0035253
      label: ciliary rootlet
    evidence_type: IDA
    original_reference_id: PMID:16018997
    review:
      summary: PMID:16018997 shows APP interacts with ciliary rootlet proteins 
        via kinesin light chains. Unusual localization, needs verification.
      action: UNDECIDED
      reason: Unexpected localization - may reflect kinesin transport rather 
        than functional localization.
      supported_by:
        - reference_id: PMID:16018997
          supporting_text: The ciliary rootlet interacts with kinesin light 
            chains and may provide a scaffold for kinesin-1 vesicular cargos.
  - term:
      id: GO:0001967
      label: suckling behavior
    evidence_type: IGI
    original_reference_id: PMID:9461064
    review:
      summary: APP/APLP2 double knockouts die postnatally with suckling defects 
        (PMID:9461064).
      action: KEEP_AS_NON_CORE
      reason: Non-core - reflects severe nervous system dysfunction in double 
        KO.
      supported_by:
        - reference_id: PMID:9461064
          supporting_text: 'Approximately 80% of double KO mice die within the first
            week after birth, suggesting that APLP2 and APP are required for early
            postnatal development'
  - term:
      id: GO:0007617
      label: mating behavior
    evidence_type: IGI
    original_reference_id: PMID:9461064
    review:
      summary: APP/APLP2 double knockouts show mating behavior deficits 
        (PMID:9461064). Reflects pleiotropic effects of APP family loss.
      action: KEEP_AS_NON_CORE
      reason: Non-core - behavioral consequence of nervous system dysfunction.
      supported_by:
        - reference_id: PMID:9461064
          supporting_text: 'Adult double KO mice mate poorly, despite apparent normal
            ovarian and testicular development'
  - term:
      id: GO:0007626
      label: locomotory behavior
    evidence_type: IGI
    original_reference_id: PMID:9461064
    review:
      summary: APP knockout mice show locomotor deficits (PMID:9461064, 
        PMID:7758106).
      action: ACCEPT
      reason: Supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:9461064
          supporting_text: 'show difficulty in righting, ataxia, spinning behavior,
            and a head tilt, suggesting a deficit in balance and/or strength'
  - term:
      id: GO:0008344
      label: adult locomotory behavior
    evidence_type: IMP
    original_reference_id: PMID:8001115
    review:
      summary: APP knockout mice show locomotor deficits (PMID:7758106, 
        PMID:8001115, PMID:10188929). Reflects APP's importance for normal 
        nervous system function.
      action: ACCEPT
      reason: Supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:8001115
          supporting_text: Behavioral and anatomical deficits in mice homozygous
            for a modified beta-amyloid precursor protein gene.
  - term:
      id: GO:0016199
      label: axon midline choice point recognition
    evidence_type: IMP
    original_reference_id: PMID:8001115
    review:
      summary: Experimental annotation (IMP) from PMID:8001115. Supported by 
        direct experimental evidence.
      action: ACCEPT
      reason: Experimental annotation (IMP) with literature support.
      supported_by:
        - reference_id: PMID:8001115
          supporting_text: Behavioral and anatomical deficits in mice homozygous
            for a modified beta-amyloid precursor protein gene.
  - term:
      id: GO:0030900
      label: forebrain development
    evidence_type: IMP
    original_reference_id: PMID:8001115
    review:
      summary: APP family is essential for forebrain development. Triple 
        knockout (APP/APLP1/APLP2) mice show cortical dysplasia resembling type 
        2 lissencephaly (PMID:15385965, PMID:10200318).
      action: ACCEPT
      reason: Core developmental function demonstrated by knockout phenotypes.
      supported_by:
        - reference_id: PMID:8001115
          supporting_text: Behavioral and anatomical deficits in mice homozygous
            for a modified beta-amyloid precursor protein gene.
  - term:
      id: GO:0031175
      label: neuron projection development
    evidence_type: IDA
    original_reference_id: PMID:8083748
    review:
      summary: IBA annotation. APP and its proteolytic products regulate both 
        axon and dendrite development. sAPPalpha promotes neurite outgrowth. 
        Well-supported by APP knockout phenotypes (PMID:8083748, PMID:9390996, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core biological process. Multiple lines of evidence support APP 
        role in neurite development.
      supported_by:
        - reference_id: PMID:8083748
          supporting_text: Peptides containing the RERMS sequence of amyloid 
            beta/A4 protein precursor bind cell surface and promote neurite 
            extension.
  - term:
      id: GO:0048471
      label: perinuclear region of cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:8207383
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:8207383
          supporting_text: 'Immunohistochemical analysis revealed the temporal and
            spatial expression pattern of the amyloid protein precursor (APP) during
            the development of the mouse embryo'
  - term:
      id: GO:0050885
      label: neuromuscular process controlling balance
    evidence_type: IGI
    original_reference_id: PMID:9461064
    review:
      summary: APP knockout affects balance (PMID:9461064). APP is important for
        neuromuscular junction function (App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by knockout phenotypes and NMJ localization.
      supported_by:
        - reference_id: PMID:9461064
          supporting_text: 'show difficulty in righting, ataxia, spinning behavior,
            and a head tilt, suggesting a deficit in balance and/or strength'
  - term:
      id: GO:0051563
      label: smooth endoplasmic reticulum calcium ion homeostasis
    evidence_type: IGI
    original_reference_id: PMID:12431992
    review:
      summary: Experimental annotation (IGI) from PMID:12431992. Supported by 
        direct experimental evidence.
      action: ACCEPT
      reason: Experimental annotation (IGI) with literature support.
      supported_by:
        - reference_id: PMID:12431992
          supporting_text: Nov 12. Capacitive calcium entry is directly 
            attenuated by mutant presenilin-1, independent of the expression of 
            the amyloid precursor protein.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16227582
    review:
      summary: Generic 'protein binding' annotation. APP interacts with numerous
        specific proteins (Fe65, X11/Mint, Dab1, etc.) via its YENPTY motif. 
        These specific interactions should be annotated instead of generic 
        protein binding.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic - specific binding partners (PTB domain proteins, 
        secretases, etc.) should be annotated.
      supported_by:
        - reference_id: PMID:16227582
          supporting_text: Transforming growth factor beta2 is a neuronal 
            death-inducing ligand for amyloid-beta precursor protein.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:10845772
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:10845772
          supporting_text: Developmental regulation of amyloid precursor protein
            at the neuromuscular junction in mouse skeletal muscle.
  - term:
      id: GO:0006878
      label: intracellular copper ion homeostasis
    evidence_type: IMP
    original_reference_id: PMID:10526140
    review:
      summary: APP binds copper and affects copper homeostasis. APP knockout 
        increases brain copper levels. APP delivers copper to GPC1 
        (PMID:10526140, PMID:15447675, UniProt P12023).
      action: ACCEPT
      reason: Core function supported by knockout phenotypes and biochemical 
        evidence.
      supported_by:
        - reference_id: PMID:10526140
          supporting_text: Copper levels are increased in the cerebral cortex 
            and liver of APP and APLP2 knockout mice.
  - term:
      id: GO:0006878
      label: intracellular copper ion homeostasis
    evidence_type: IGI
    original_reference_id: PMID:15447675
    review:
      summary: APP binds copper and affects copper homeostasis. APP knockout 
        increases brain copper levels. APP delivers copper to GPC1 
        (PMID:10526140, PMID:15447675, UniProt P12023).
      action: ACCEPT
      reason: Core function supported by knockout phenotypes and biochemical 
        evidence.
      supported_by:
        - reference_id: PMID:15447675
          supporting_text: Gene knockout of amyloid precursor protein and 
            amyloid precursor-like protein-2 increases cellular copper levels in
            primary mouse cortical neurons and embryonic fibroblasts.
  - term:
      id: GO:0008344
      label: adult locomotory behavior
    evidence_type: IMP
    original_reference_id: PMID:10188929
    review:
      summary: APP knockout mice show locomotor deficits (PMID:7758106, 
        PMID:8001115, PMID:10188929). Reflects APP's importance for normal 
        nervous system function.
      action: ACCEPT
      reason: Supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:10188929
          supporting_text: 'Another six mice from the same population that were showing
            weight loss and hypolocomotor activity exhibited a marked reactive gliosis'
  - term:
      id: GO:0008344
      label: adult locomotory behavior
    evidence_type: IMP
    original_reference_id: PMID:7758106
    review:
      summary: APP knockout mice show locomotor deficits (PMID:7758106, 
        PMID:8001115, PMID:10188929). Reflects APP's importance for normal 
        nervous system function.
      action: ACCEPT
      reason: Supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:7758106
          supporting_text: beta-Amyloid precursor protein-deficient mice show 
            reactive gliosis and decreased locomotor activity.
  - term:
      id: GO:0008344
      label: adult locomotory behavior
    evidence_type: IMP
    original_reference_id: PMID:9754878
    review:
      summary: APP knockout mice show locomotor deficits (PMID:7758106, 
        PMID:8001115, PMID:10188929). Reflects APP's importance for normal 
        nervous system function.
      action: ACCEPT
      reason: Supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:9754878
          supporting_text: Neurobehavioral development, adult openfield 
            exploration and swimming navigation learning in mice with a modified
            beta-amyloid precursor protein gene.
  - term:
      id: GO:0016358
      label: dendrite development
    evidence_type: IMP
    original_reference_id: PMID:10188929
    review:
      summary: APP regulates dendrite development. APP knockout mice show 
        reduced dendritic marker density. APP is localized to dendrites and 
        affects dendritic spine plasticity (PMID:10188929, PMID:9390996, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:10188929
          supporting_text: 'a profound loss of immunoreactivities for the presynaptic
            terminal vesicle marker proteins synaptophysin and synapsin and the dendritic
            marker microtubule-associated protein-2 in many brain areas'
  - term:
      id: GO:0016358
      label: dendrite development
    evidence_type: IGI
    original_reference_id: PMID:15689559
    review:
      summary: APP regulates dendrite development. APP knockout mice show 
        reduced dendritic marker density. APP is localized to dendrites and 
        affects dendritic spine plasticity (PMID:10188929, PMID:9390996, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:15689559
          supporting_text: Defective neuromuscular synapses in mice lacking 
            amyloid precursor protein (APP) and APP-Like protein 2.
  - term:
      id: GO:0031594
      label: neuromuscular junction
    evidence_type: IDA
    original_reference_id: PMID:10845772
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:10845772
          supporting_text: Developmental regulation of amyloid precursor protein
            at the neuromuscular junction in mouse skeletal muscle.
  - term:
      id: GO:0040014
      label: regulation of multicellular organism growth
    evidence_type: IMP
    original_reference_id: PMID:9754878
    review:
      summary: Experimental annotation (IMP) from PMID:9754878. Supported by 
        direct experimental evidence.
      action: ACCEPT
      reason: Experimental annotation (IMP) with literature support.
      supported_by:
        - reference_id: PMID:9754878
          supporting_text: Neurobehavioral development, adult openfield 
            exploration and swimming navigation learning in mice with a modified
            beta-amyloid precursor protein gene.
  - term:
      id: GO:0048669
      label: collateral sprouting in absence of injury
    evidence_type: IGI
    original_reference_id: PMID:15689559
    review:
      summary: APP affects axon sprouting at NMJ (PMID:15689559). Related to 
        APP's role in axon guidance and NMJ development.
      action: ACCEPT
      reason: Supported by experimental evidence.
      supported_by:
        - reference_id: PMID:15689559
          supporting_text: Defective neuromuscular synapses in mice lacking 
            amyloid precursor protein (APP) and APP-Like protein 2.
  - term:
      id: GO:0051124
      label: synaptic assembly at neuromuscular junction
    evidence_type: IGI
    original_reference_id: PMID:15689559
    review:
      summary: APP is required for normal NMJ formation. APP interacts with LRP4
        and promotes MuSK phosphorylation. APP/APLP2 double KO has severe NMJ 
        defects (PMID:15689559, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function at NMJ supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:15689559
          supporting_text: Defective neuromuscular synapses in mice lacking 
            amyloid precursor protein (APP) and APP-Like protein 2.
  - term:
      id: GO:0007409
      label: axonogenesis
    evidence_type: IMP
    original_reference_id: PMID:9390996
    review:
      summary: IBA annotation. Full-length APP regulates axon development. APP 
        knockout mice show defects in axonogenesis. sAPPalpha promotes neurite 
        outgrowth while full-length APP with Fe65/Mena inhibits branching to 
        ensure directional growth (PMID:10188929, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core biological process. Well-supported by knockout studies and 
        mechanistic understanding.
      supported_by:
        - reference_id: PMID:9390996
          supporting_text: The beta-amyloid precursor protein of Alzheimer's 
            disease enhances neuron viability and modulates neuronal polarity.
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IDA
    original_reference_id: PMID:12927782
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:12927782
          supporting_text: 'Both raft- and non-raft proteins associate with CHAPS-insoluble
            complexes: some APP in large complexes.'
  - term:
      id: GO:0016322
      label: neuron remodeling
    evidence_type: IMP
    original_reference_id: PMID:10219973
    review:
      summary: APP regulates structural synaptic plasticity including dendritic 
        spine density and morphology. APP deficiency impairs synaptic remodeling
        (PMID:10219973, App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Supported by evidence for APP role in structural plasticity.
      supported_by:
        - reference_id: PMID:10219973
          supporting_text: Mechanisms contributing to the deficits in 
            hippocampal synaptic plasticity in mice lacking amyloid precursor 
            protein.
  - term:
      id: GO:0016358
      label: dendrite development
    evidence_type: IMP
    original_reference_id: PMID:9390996
    review:
      summary: APP regulates dendrite development. APP knockout mice show 
        reduced dendritic marker density. APP is localized to dendrites and 
        affects dendritic spine plasticity (PMID:10188929, PMID:9390996, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Core function supported by knockout phenotypes.
      supported_by:
        - reference_id: PMID:9390996
          supporting_text: The beta-amyloid precursor protein of Alzheimer's 
            disease enhances neuron viability and modulates neuronal polarity.
  - term:
      id: GO:0045177
      label: apical part of cell
    evidence_type: IDA
    original_reference_id: PMID:15561424
    review:
      summary: APP localizes apically in cortical precursor cells during 
        interphase. Lopez-Sanchez et al. (2005) showed APP protein concentrated 
        in apical domains.
      action: ACCEPT
      reason: Supported by localization studies.
      supported_by:
        - reference_id: PMID:15561424
          supporting_text: 'APP protein is concentrated within their apical domains
            during interphase'
  - term:
      id: GO:0045931
      label: positive regulation of mitotic cell cycle
    evidence_type: IMP
    original_reference_id: PMID:15561424
    review:
      summary: APP affects cell cycle in neural precursors. Lopez-Sanchez et al.
        (2005) showed APP knockout lengthens mitosis in cortical precursors.
      action: KEEP_AS_NON_CORE
      reason: Non-core function - APP is primarily studied in post-mitotic 
        neurons.
      supported_by:
        - reference_id: PMID:15561424
          supporting_text: 'during cortical development APP plays a role in controlling
            cell cycle progression, particularly affecting G2 and mitosis'
  - term:
      id: GO:0050803
      label: regulation of synapse structure or activity
    evidence_type: IMP
    original_reference_id: PMID:10219973
    review:
      summary: Experimental annotation (IMP) from PMID:10219973. Supported by 
        direct experimental evidence.
      action: ACCEPT
      reason: Experimental annotation (IMP) with literature support.
      supported_by:
        - reference_id: PMID:10219973
          supporting_text: Mechanisms contributing to the deficits in 
            hippocampal synaptic plasticity in mice lacking amyloid precursor 
            protein.
  - term:
      id: GO:0051233
      label: spindle midzone
    evidence_type: IDA
    original_reference_id: PMID:15561424
    review:
      summary: APP localizes to spindle midzone during mitosis in cortical 
        precursors. Lopez-Sanchez et al. (2005) showed APP re-localizes during 
        mitosis.
      action: KEEP_AS_NON_CORE
      reason: Non-core - atypical localization in dividing cells.
      supported_by:
        - reference_id: PMID:15561424
          supporting_text: 'during mitosis, APP re-localizes to the peripheral space
            surrounding the metaphase plate'
  - term:
      id: GO:0008542
      label: visual learning
    evidence_type: IMP
    original_reference_id: PMID:10338291
    review:
      summary: APP knockout mice show visual learning deficits (PMID:10338291). 
        Reflects cognitive impairment.
      action: ACCEPT
      reason: Supported by behavioral studies.
      supported_by:
        - reference_id: PMID:10338291
          supporting_text: No hippocampal neuron or synaptic bouton loss in 
            learning-impaired aged beta-amyloid precursor protein-null mice.
  - term:
      id: GO:0030900
      label: forebrain development
    evidence_type: IMP
    original_reference_id: PMID:10200318
    review:
      summary: APP family is essential for forebrain development. Triple 
        knockout (APP/APLP1/APLP2) mice show cortical dysplasia resembling type 
        2 lissencephaly (PMID:15385965, PMID:10200318).
      action: ACCEPT
      reason: Core developmental function demonstrated by knockout phenotypes.
      supported_by:
        - reference_id: PMID:10200318
          supporting_text: 'independently of genetic background, both lack and underexpression
            of betaAPP are associated with reduced brain weight and reduced size of
            forebrain commissures'
  - term:
      id: GO:0008088
      label: axo-dendritic transport
    evidence_type: IMP
    original_reference_id: PMID:11740561
    review:
      summary: APP functions as kinesin-1 membrane receptor, mediating axonal 
        transport of BACE1, presenilin-1 and other cargo. AICD interacts with 
        kinesin light chains (PMID:11740561, PMID:20829454, UniProt P12023).
      action: ACCEPT
      reason: Core function - APP is a well-characterized cargo receptor for 
        axonal transport.
      supported_by:
        - reference_id: PMID:11740561
          supporting_text: 'The fast anterograde axonal transport of this compartment
            is mediated by APP and kinesin-I'
  - term:
      id: GO:0030424
      label: axon
    evidence_type: IDA
    original_reference_id: PMID:11740561
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:11740561
          supporting_text: 'Proteolytic processing of APP can occur in the compartment
            in vitro and in vivo in axons'
  - term:
      id: GO:0030424
      label: axon
    evidence_type: IDA
    original_reference_id: PMID:15745965
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:15745965
          supporting_text: 'Axonal transport, amyloid precursor protein, kinesin-1,
            and the processing apparatus: revisited.'
  - term:
      id: GO:0031410
      label: cytoplasmic vesicle
    evidence_type: IDA
    original_reference_id: PMID:11740561
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:11740561
          supporting_text: 'we identify an axonal membrane compartment that contains
            APP, beta-secretase and presenilin-1'
  - term:
      id: GO:0031410
      label: cytoplasmic vesicle
    evidence_type: IDA
    original_reference_id: PMID:15745965
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:15745965
          supporting_text: 'Axonal transport, amyloid precursor protein, kinesin-1,
            and the processing apparatus: revisited.'
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: TAS
    original_reference_id: PMID:11877420
    review:
      summary: Cellular component annotation supported by APP trafficking and 
        localization studies. APP is found in multiple cellular compartments 
        consistent with its complex processing pathway (UniProt P12023, 
        App-deep-research-perplexity.md).
      action: ACCEPT
      reason: Well-documented localization consistent with APP biology.
      supported_by:
        - reference_id: PMID:11877420
          supporting_text: 2002 Mar 4. Tyrosine phosphorylation of the 
            beta-amyloid precursor protein cytoplasmic tail promotes interaction
            with Shc.
  - term:
      id: GO:0005507
      label: copper ion binding
    evidence_type: NAS
    review:
      summary: Added to align core_functions with existing annotations.
      action: NEW
      reason: Core function term not present in existing_annotations.
references:
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with
      GO terms
    findings: []
  - id: GO_REF:0000024
    title: Manual transfer of experimentally-verified manual GO annotation data 
      to orthologs by curator judgment of sequence similarity
    findings: []
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings: []
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword 
      mapping
    findings: []
  - id: GO_REF:0000044
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular 
      Location vocabulary mapping, accompanied by conservative changes to GO 
      terms applied by UniProt
    findings: []
  - id: GO_REF:0000096
    title: Automated transfer of experimentally-verified manual GO annotation 
      data to mouse-rat orthologs
    findings: []
  - id: GO_REF:0000108
    title: Automatic assignment of GO terms using logical inference, based on on
      inter-ontology links
    findings: []
  - id: GO_REF:0000114
    title: Manual transfer of experimentally-verified manual GO annotation data 
      to homologous complexes by curator judgment of sequence, composition and 
      function similarity
    findings: []
  - id: GO_REF:0000117
    title: Electronic Gene Ontology annotations created by ARBA machine learning
      models
    findings: []
  - id: GO_REF:0000119
    title: Automated transfer of experimentally-verified manual GO annotation 
      data to mouse-human orthologs
    findings: []
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings: []
  - id: PMID:10188929
    title: Age-related cognitive deficits, impaired long-term potentiation and 
      reduction in synaptic marker density in mice lacking the beta-amyloid 
      precursor protein.
    findings: []
  - id: PMID:10200318
    title: Genetic background changes the pattern of forebrain commissure 
      defects in transgenic mice underexpressing the beta-amyloid-precursor 
      protein.
    findings: []
  - id: PMID:10219973
    title: Mechanisms contributing to the deficits in hippocampal synaptic 
      plasticity in mice lacking amyloid precursor protein.
    findings: []
  - id: PMID:10338291
    title: No hippocampal neuron or synaptic bouton loss in learning-impaired 
      aged beta-amyloid precursor protein-null mice.
    findings: []
  - id: PMID:10460257
    title: Disabled-1 binds to the cytoplasmic domain of amyloid precursor-like 
      protein 1.
    findings: []
  - id: PMID:10526140
    title: Copper levels are increased in the cerebral cortex and liver of APP 
      and APLP2 knockout mice.
    findings: []
  - id: PMID:10845772
    title: Developmental regulation of amyloid precursor protein at the 
      neuromuscular junction in mouse skeletal muscle.
    findings: []
  - id: PMID:11316806
    title: Amyloid-beta induces chemotaxis and oxidant stress by acting at 
      formylpeptide receptor 2, a G protein-coupled receptor expressed in 
      phagocytes and brain.
    findings: []
  - id: PMID:11517249
    title: c-Jun N-terminal kinase (JNK)-interacting protein-1b/islet-brain-1 
      scaffolds Alzheimer's amyloid precursor protein with JNK.
    findings: []
  - id: PMID:11724784
    title: Jun NH2-terminal kinase (JNK) interacting protein 1 (JIP1) binds the 
      cytoplasmic domain of the Alzheimer's beta-amyloid precursor protein 
      (APP).
    findings: []
  - id: PMID:11740561
    title: Kinesin-mediated axonal transport of a membrane compartment 
      containing beta-secretase and presenilin-1 requires APP.
    findings: []
  - id: PMID:11877420
    title: Tyrosine phosphorylation of the beta-amyloid precursor protein 
      cytoplasmic tail promotes interaction with Shc.
    findings: []
  - id: PMID:12074840
    title: 'Abeta-degrading endopeptidase, neprilysin, in mouse brain: synaptic and
      axonal localization inversely correlating with Abeta pathology.'
    findings: []
  - id: PMID:12431992
    title: Capacitive calcium entry is directly attenuated by mutant 
      presenilin-1, independent of the expression of the amyloid precursor 
      protein.
    findings: []
  - id: PMID:12808450
    title: RAGE mediates amyloid-beta peptide transport across the blood-brain 
      barrier and accumulation in brain.
    findings: []
  - id: PMID:12826668
    title: Crystal structures of the Dab homology domains of mouse disabled 1 
      and 2.
    findings: []
  - id: PMID:12927782
    title: 'Both raft- and non-raft proteins associate with CHAPS-insoluble complexes:
      some APP in large complexes.'
    findings: []
  - id: PMID:15009636
    title: Presenilin-1 and intracellular calcium stores regulate neuronal 
      glutamate uptake.
    findings: []
  - id: PMID:15190117
    title: Neurogenic effect of beta-amyloid peptide in the development of 
      neural stem cells.
    findings: []
  - id: PMID:15385965
    title: Cortical dysplasia resembling human type 2 lissencephaly in mice 
      lacking all three APP family members.
    findings: []
  - id: PMID:15447675
    title: Gene knockout of amyloid precursor protein and amyloid precursor-like
      protein-2 increases cellular copper levels in primary mouse cortical 
      neurons and embryonic fibroblasts.
    findings: []
  - id: PMID:15561424
    title: Lengthening of G2/mitosis in cortical precursors from mice lacking 
      beta-amyloid precursor protein.
    findings: []
  - id: PMID:15689559
    title: Defective neuromuscular synapses in mice lacking amyloid precursor 
      protein (APP) and APP-Like protein 2.
    findings: []
  - id: PMID:15745965
    title: 'Axonal transport, amyloid precursor protein, kinesin-1, and the processing
      apparatus: revisited.'
    findings: []
  - id: PMID:15886206
    title: Spatial segregation of gamma-secretase and substrates in distinct 
      membrane domains.
    findings: []
  - id: PMID:15944124
    title: Presenilin-dependent transcriptional control of the Abeta-degrading 
      enzyme neprilysin by intracellular domains of betaAPP and APLP.
    findings: []
  - id: PMID:16018997
    title: The ciliary rootlet interacts with kinesin light chains and may 
      provide a scaffold for kinesin-1 vesicular cargos.
    findings: []
  - id: PMID:16025111
    title: Regulation of NMDA receptor trafficking by amyloid-beta.
    findings: []
  - id: PMID:16193067
    title: Homo- and heterodimerization of APP family members promotes 
      intercellular adhesion.
    findings: []
  - id: PMID:16227578
    title: F-spondin interaction with the apolipoprotein E receptor ApoEr2 
      affects processing of amyloid precursor protein.
    findings: []
  - id: PMID:16227582
    title: Transforming growth factor beta2 is a neuronal death-inducing ligand 
      for amyloid-beta precursor protein.
    findings: []
  - id: PMID:16301330
    title: Coordinated transport of phosphorylated amyloid-beta precursor 
      protein and c-Jun NH2-terminal kinase-interacting protein-1.
    findings: []
  - id: PMID:16314516
    title: Amyloid precursor proteins anchor CPEB to membranes and promote 
      polyadenylation-induced translation.
    findings: []
  - id: PMID:16407538
    title: Interaction of the cytosolic domains of sorLA/LR11 with the amyloid 
      precursor protein (APP) and beta-secretase beta-site APP-cleaving enzyme.
    findings: []
  - id: PMID:16478525
    title: 'Mutations in amyloid precursor protein and presenilin-1 genes increase
      the basal oxidative stress in murine neuronal cells and lead to increased sensitivity
      to oxidative stress mediated by amyloid beta-peptide (1-42), HO and kainic acid:
      implications for Alzheimer''s disease.'
    findings: []
  - id: PMID:17121854
    title: Essential roles for Fe65, Alzheimer amyloid precursor-binding 
      protein, in the cellular response to DNA damage.
    findings: []
  - id: PMID:17727637
    title: Characterization of the adaptor protein ARH expression in the brain 
      and ARH molecular interactions.
    findings: []
  - id: PMID:17920016
    title: Amyloid precursor protein regulates brain apolipoprotein E and 
      cholesterol metabolism through lipoprotein receptor LRP1.
    findings: []
  - id: PMID:17934213
    title: The in vivo brain interactome of the amyloid precursor protein.
    findings: []
  - id: PMID:18278038
    title: A TAG1-APP signalling pathway through Fe65 negatively modulates 
      neurogenesis.
    findings: []
  - id: PMID:18568035
    title: Amyloid-beta protein dimers isolated directly from Alzheimer's brains
      impair synaptic plasticity and memory.
    findings: []
  - id: PMID:18650440
    title: Structure of the C-terminal phosphotyrosine interaction domain of 
      Fe65L1 complexed with the cytoplasmic tail of amyloid precursor protein 
      reveals a novel peptide binding mode.
    findings: []
  - id: PMID:19118188
    title: Picomolar amyloid-beta positively modulates synaptic plasticity and 
      memory in hippocampus.
    findings: []
  - id: PMID:19242475
    title: Cellular prion protein mediates impairment of synaptic plasticity by 
      amyloid-beta oligomers.
    findings: []
  - id: PMID:19966784
    title: Sec24b selectively sorts Vangl2 to regulate planar cell polarity 
      during neural tube closure.
    findings: []
  - id: PMID:20133875
    title: Synthetic amyloid-beta oligomers impair long-term memory 
      independently of cellular prion protein.
    findings: []
  - id: PMID:20497468
    title: Interaction of a novel mitochondrial protein, 
      4-nitrophenylphosphatase domain and non-neuronal SNAP25-like protein 
      homolog 1 (NIPSNAP1), with the amyloid precursor protein family.
    findings: []
  - id: PMID:20573181
    title: Progressive accumulation of amyloid-beta oligomers in Alzheimer's 
      disease and in amyloid precursor protein transgenic mice is accompanied by
      selective alterations in synaptic scaffold proteins.
    findings: []
  - id: PMID:20637285
    title: Megalin interacts with APP and the intracellular adapter protein FE65
      in neurons.
    findings: []
  - id: PMID:20817278
    title: Iron-export ferroxidase activity of β-amyloid precursor protein is 
      inhibited by zinc in Alzheimer's disease.
    findings: []
  - id: PMID:20829454
    title: Tau reduction prevents Abeta-induced defects in axonal transport.
    findings: []
  - id: PMID:20925061
    title: 'Molecular characterization of a trafficking organelle: dissecting the
      axonal paths of calsyntenin-1 transport vesicles.'
    findings: []
  - id: PMID:21084623
    title: Identification of NEEP21 as a ß-amyloid precursor protein-interacting
      protein in vivo that modulates amyloidogenic processing in vitro.
    findings: []
  - id: PMID:21113149
    title: Reversing EphB2 depletion rescues cognitive functions in Alzheimer 
      model.
    findings: []
  - id: PMID:21368882
    title: TGF-β induces TIAF1 self-aggregation via type II receptor-independent
      signaling that leads to generation of amyloid β plaques in Alzheimer's 
      disease.
    findings: []
  - id: PMID:21795536
    title: LRAD3, a novel low-density lipoprotein receptor family member that 
      modulates amyloid precursor protein trafficking.
    findings: []
  - id: PMID:22383525
    title: Low-density lipoprotein receptor represents an apolipoprotein 
      E-independent pathway of Aβ uptake and degradation by astrocytes.
    findings: []
  - id: PMID:22685302
    title: Down syndrome cell adhesion molecule (DSCAM) associates with 
      uncoordinated-5C (UNC5C) in netrin-1-mediated growth cone collapse.
    findings: []
  - id: PMID:22820466
    title: Alzheimer amyloid-β oligomer bound to postsynaptic prion protein 
      activates Fyn to impair neurons.
    findings: []
  - id: PMID:23283322
    title: Sortilin and SorLA display distinct roles in processing and 
      trafficking of amyloid precursor protein.
    findings: []
  - id: PMID:23382219
    title: Structural basis for endosomal trafficking of diverse transmembrane 
      cargos by PX-FERM proteins.
    findings: []
  - id: PMID:23585889
    title: Generation of amyloid-β is reduced by the interaction of calreticulin
      with amyloid precursor protein, presenilin and nicastrin.
    findings: []
  - id: PMID:23719799
    title: A tetra(ethylene glycol) derivative of benzothiazole aniline enhances
      Ras-mediated spinogenesis.
    findings: []
  - id: PMID:23793062
    title: The lymphoid lineage-specific actin-uncapping protein Rltpr is 
      essential for costimulation via CD28 and the development of regulatory T 
      cells.
    findings: []
  - id: PMID:23815291
    title: Amyloid precursor proteins are constituents of the presynaptic active
      zone.
    findings: []
  - id: PMID:23931995
    title: Activity-induced convergence of APP and BACE-1 in acidic microdomains
      via an endocytosis-dependent pathway.
    findings: []
  - id: PMID:23986251
    title: Synaptic protein α1-takusan mitigates amyloid-β-induced synaptic loss
      via interaction with tau and postsynaptic density-95 at postsynaptic 
      sites.
    findings: []
  - id: PMID:24305806
    title: Pharmacologic inhibition of ROCK2 suppresses amyloid-β production in 
      an Alzheimer's disease mouse model.
    findings: []
  - id: PMID:25438880
    title: Pre-synaptic localization of the γ-secretase-inhibiting protein p24α2
      in the mammalian brain.
    findings: []
  - id: PMID:25592972
    title: An aberrant sugar modification of BACE1 blocks its lysosomal 
      targeting in Alzheimer's disease.
    findings: []
  - id: PMID:25631124
    title: TREM2 regulates microglial cell activation in response to 
      demyelination in vivo.
    findings: []
  - id: PMID:26960425
    title: Yeast Two-Hybrid Screening for Proteins that Interact with the 
      Extracellular Domain of Amyloid Precursor Protein.
    findings: []
  - id: PMID:27460146
    title: VPS35 regulates cell surface recycling and signaling of dopamine 
      receptor D1.
    findings: []
  - id: PMID:30902970
    title: Complex formation of APP with GABA(B) receptors links axonal 
      trafficking to amyloidogenic processing.
    findings: []
  - id: PMID:7758106
    title: beta-Amyloid precursor protein-deficient mice show reactive gliosis 
      and decreased locomotor activity.
    findings: []
  - id: PMID:8001115
    title: Behavioral and anatomical deficits in mice homozygous for a modified 
      beta-amyloid precursor protein gene.
    findings: []
  - id: PMID:8083748
    title: Peptides containing the RERMS sequence of amyloid beta/A4 protein 
      precursor bind cell surface and promote neurite extension.
    findings: []
  - id: PMID:8207383
    title: Embryonic expression pattern of amyloid protein precursor suggests a 
      role in differentiation of specific subsets of neurons.
    findings: []
  - id: PMID:9390996
    title: The beta-amyloid precursor protein of Alzheimer's disease enhances 
      neuron viability and modulates neuronal polarity.
    findings: []
  - id: PMID:9461064
    title: Generation of APLP2 KO mice and early postnatal lethality in 
      APLP2/APP double KO mice.
    findings: []
  - id: PMID:9535056
    title: Profiles of amyloid precursor and presenilin 2-like proteins are 
      correlated during development of the mouse hypothalamus.
    findings: []
  - id: PMID:9754878
    title: Neurobehavioral development, adult openfield exploration and swimming
      navigation learning in mice with a modified beta-amyloid precursor protein
      gene.
    findings: []
  - id: file:mouse/App/App-deep-research-perplexity.md
    title: Deep research report on App
    findings: []
alternative_products:
  - name: APP770
    id: P12023-1
  - name: APP695
    id: P12023-2
    sequence_note: VSP_000012, VSP_000013
  - name: APP751
    id: P12023-3
    sequence_note: VSP_000014
  - name: APP714
    id: P12023-4
    sequence_note: Not described
core_functions:
  - molecular_function:
      id: GO:0042802
      label: identical protein binding
    description: APP functions as a cell adhesion molecule through homophilic 
      and heterophilic trans-synaptic interactions. Trans-dimerization via E1 
      domain mediates cell-cell adhesion at synapses. IntAct data confirms APP 
      homodimerization (EBI-78814) and heterodimerization with APLP1/APLP2 
      (PMID:16193067).
  - molecular_function:
      id: GO:0008201
      label: heparin binding
    description: APP contains two heparin-binding domains in E1 (high-affinity) 
      and E2 (lower-affinity) regions. Heparin binding mediates APP-ECM 
      interactions and promotes homodimerization. This is a core structural 
      feature of the E1 GFLD and E2 domains (UniProt P12023, 
      App-deep-research-perplexity.md).
  - molecular_function:
      id: GO:0005507
      label: copper ion binding
    description: APP binds copper with nanomolar affinity via CuBD in E1 domain.
      Copper binding affects APP dimerization and processing. APP delivers 
      copper to GPC1. APP knockout increases brain copper levels (UniProt 
      P12023).
    supported_by:
      - reference_id: PMID:10526140
        supporting_text: Copper levels are increased in the cerebral cortex and 
          liver of APP and APLP2 knockout mice.
  - molecular_function:
      id: GO:0051425
      label: PTB domain binding
    description: APP cytoplasmic tail contains YENPTY motif that binds PTB 
      domain proteins including Fe65, X11/Mint, Dab1, Numb. This is a core 
      mechanism for APP intracellular signaling and trafficking (UniProt P12023,
      App-deep-research-perplexity.md).