SCAMP5

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0006887 exocytosis	IBA GO_REF:0000033	ACCEPT	Summary: SCAMP5 is involved in calcium-regulated exocytosis as demonstrated by functional studies showing it promotes calcium-triggered cytokine secretion (PMID:19234194). The IBA annotation is consistent with experimental evidence from multiple publications. Reason: The IBA annotation is well-supported by experimental evidence from Han et al. (2009) showing SCAMP5 facilitates calcium-triggered exocytosis of cytokines in cooperation with SNARE machinery. This represents a core function of SCAMP5. Supporting Evidence: PMID:19234194 hSCAMP5, in cooperation with the SNARE machinery, is involved in calcium-regulated exocytosis of signal peptide-containing cytokines file:human/SCAMP5/SCAMP5-deep-research-falcon.md model: Edison Scientific Literature
GO:0032588 trans-Golgi network membrane	IBA GO_REF:0000033	ACCEPT	Summary: SCAMP5 localizes primarily to the trans-Golgi network membrane, confirmed by multiple studies using immunofluorescence microscopy and subcellular fractionation (PMID:15840657, PMID:19234194). Reason: The IBA annotation is strongly supported by experimental IDA evidence. Lin et al. (2005) showed SCAMP5 accumulates at the TGN as part of complexes with NHE7, and Han et al. (2009) confirmed Golgi-associated localization. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN PMID:19234194 hSCAMP5 is mainly localized in the Golgi-associated compartments
GO:0055038 recycling endosome membrane	IBA GO_REF:0000033	ACCEPT	Summary: SCAMP5 is present on recycling endosome membranes, where it participates in trafficking of cargo proteins like NHE7 between recycling vesicles and the TGN (PMID:15840657). Reason: The IBA annotation is supported by experimental evidence from Lin et al. (2005) demonstrating that SCAMP proteins including SCAMP5 reside in recycling vesicles as part of trafficking complexes. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles
GO:0000139 Golgi membrane	IEA GO_REF:0000044	ACCEPT	Summary: SCAMP5 is located on the Golgi membrane, which is consistent with its primary localization at the trans-Golgi network. The IEA annotation based on UniProt subcellular location is supported by experimental evidence. Reason: The IEA annotation is correct and consistent with the more specific IDA annotations for TGN membrane localization. Multiple studies confirm Golgi-associated localization of SCAMP5. Supporting Evidence: PMID:19234194 hSCAMP5 is mainly localized in the Golgi-associated compartments
GO:0005794 Golgi apparatus	IEA GO_REF:0000044	ACCEPT	Summary: SCAMP5 is located in the Golgi apparatus as a multi-pass membrane protein. This IEA annotation is a valid broader localization consistent with the more specific TGN membrane annotations. Reason: The annotation is correct as a parent term of the more specific TGN membrane localization. Experimental evidence confirms Golgi apparatus localization. Supporting Evidence: PMID:19234194 hSCAMP5 is mainly localized in the Golgi-associated compartments
GO:0005886 plasma membrane	IEA GO_REF:0000044	ACCEPT	Summary: SCAMP5 translocates to the plasma membrane upon calcium-triggered exocytosis. This is a dynamic localization rather than steady-state, representing its functional role in exocytosis. Reason: The annotation is supported by experimental evidence showing SCAMP5 translocates from Golgi to plasma membrane during calcium-triggered exocytosis (PMID:19234194). Supporting Evidence: PMID:19234194 calcium ionophore ionomycin can trigger a rapid translocation of hSCAMP5 from Golgi apparatus to plasma membrane along the classical exocytosis pathway
GO:0006887 exocytosis	IEA GO_REF:0000043	ACCEPT	Summary: This IEA annotation for exocytosis is based on UniProt keyword mapping and is redundant with the IBA annotation. Both are correct. Reason: The annotation is correct and consistent with experimental evidence for SCAMP5 function in exocytosis. Duplicate GO IDs with different evidence codes are acceptable. Supporting Evidence: PMID:19234194 hSCAMP5, in cooperation with the SNARE machinery, is involved in calcium-regulated exocytosis
GO:0015031 protein transport	IEA GO_REF:0000120	ACCEPT	Summary: SCAMP5 is involved in protein transport as part of its core function in vesicular trafficking. This includes transport of NHE7 between TGN and recycling vesicles, as well as ATG9A trafficking to presynaptic terminals. Reason: The annotation is a valid broader term for SCAMP5 function. The protein participates in transport of multiple cargo proteins including NHE7 and ATG9A through the secretory/endosomal pathway. Supporting Evidence: PMID:15840657 SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN
GO:0016020 membrane	IEA GO_REF:0000002	ACCEPT	Summary: SCAMP5 is a multi-pass transmembrane protein with four transmembrane helices. This is the broadest valid membrane localization term. Reason: The annotation is correct but very general. SCAMP5 has four predicted transmembrane domains and localizes to multiple membrane compartments. Supporting Evidence: PMID:19234194 Secretory carrier membrane proteins (SCAMPs) are widely distributed integral membrane molecules
GO:0030672 synaptic vesicle membrane	IEA GO_REF:0000044	ACCEPT	Summary: SCAMP5 is highly enriched in synaptic vesicles, particularly in neurons where it plays key roles in synaptic vesicle cycling and presynaptic autophagy. The deep research confirms synaptic vesicle enrichment. Reason: The annotation is well-supported by recent literature demonstrating SCAMP5 localization to synaptic vesicles and its function in synaptic vesicle endocytosis and presynaptic autophagy. Supporting Evidence: PMID:19234194 In this study, we report the functional characterization of human SCAMP5 (hSCAMP5), a novel SCAMP protein that is widely expressed by a variety of neuronal and nonneuronal tissues and cells
GO:0031410 cytoplasmic vesicle	IEA GO_REF:0000043	ACCEPT	Summary: SCAMP5 localizes to cytoplasmic vesicles including secretory vesicles, recycling endosomes, and synaptic vesicles. This is a valid but general localization annotation. Reason: The annotation is correct as a broad localization term. SCAMP5 is found on multiple types of cytoplasmic vesicles as part of its trafficking function. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles
GO:0055038 recycling endosome membrane	IEA GO_REF:0000044	ACCEPT	Summary: This IEA annotation for recycling endosome membrane is redundant with the IBA annotation but remains valid based on experimental evidence. Reason: The annotation is correct and supported by experimental evidence from Lin et al. (2005). Duplicate annotations with different evidence codes are acceptable. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles
GO:0005515 protein binding	IPI PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	MODIFY	Summary: This protein binding annotation refers to the interaction of SCAMP5 with synaptotagmins (SYT1, SYT2) via its C-terminal tail. While the interaction is valid, the term is too general. Reason: The protein binding term is uninformative. SCAMP5 interacts specifically with synaptotagmins as calcium sensors in the context of SNARE-mediated exocytosis. A more specific MF term would better capture this function. Proposed replacements: syntaxin-1 binding Supporting Evidence: PMID:19234194 hSCAMP5 can directly interact with the calcium sensor synaptotagmins via the cytosolic C-terminal tail of hSCAMP5
GO:0005515 protein binding	IPI PMID:32296183 A reference map of the human binary protein interactome.	MARK AS OVER ANNOTATED	Summary: This protein binding annotation is from the HuRI high-throughput interactome study. While valid, protein binding is too general to be informative for the molecular function of SCAMP5. Reason: The HuRI study (PMID:32296183) detected many protein-protein interactions in a high-throughput screen. While technically correct, protein binding annotations from such studies are overly general and do not inform about the specific molecular function of SCAMP5. Supporting Evidence: PMID:32296183 HuRI, a systematically generated human protein interactome map with more than 50,000 PPIs
GO:0044877 protein-containing complex binding	IDA PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	ACCEPT	Summary: SCAMP5 interacts with SNARE machinery components as protein complexes during calcium-triggered exocytosis. This annotation captures the interaction with SNARE complexes. Reason: The annotation is supported by evidence that SCAMP5 codistributes and complexes with SNARE molecules during translocation from Golgi to plasma membrane. This represents SCAMP5 binding to protein complexes. Supporting Evidence: PMID:19234194 hSCAMP5 can codistribute and complex with local soluble N-ethylmaleimide sensitive factor attachment protein receptors (SNAREs) molecules
GO:0000139 Golgi membrane	IDA PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	ACCEPT	Summary: SCAMP5 localization to Golgi membrane was demonstrated by immunofluorescence confocal microscopy and subcellular fractionation in Han et al. (2009). Reason: The annotation is well-supported by experimental evidence showing SCAMP5 is mainly localized in Golgi-associated compartments. Supporting Evidence: PMID:19234194 By using subcellular fractionation, immunofluorescence confocal microscopy, and membrane vesicle immunoisolation methods, we find that hSCAMP5 is mainly localized in the Golgi-associated compartments
GO:0001819 positive regulation of cytokine production	IDA PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	ACCEPT	Summary: SCAMP5 promotes calcium-regulated secretion of signal peptide-containing cytokines such as CCL5/RANTES. This was demonstrated in multiple cell types including epithelial cancer cells, monocytes, and macrophages. Reason: The annotation is directly supported by experimental evidence from Han et al. (2009) showing SCAMP5 promotes cytokine secretion. This represents a downstream consequence of its exocytosis function. Supporting Evidence: PMID:19234194 hSCAMP5 can promote the calcium-regulated signal peptide-containing cytokine (CCL5 but not IL-1beta) secretion in human epithelial cancer cells, human monocytes, and mouse macrophages
GO:0005515 protein binding	IPI PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	MODIFY	Summary: This protein binding annotation refers to the interaction between SCAMP5 and NHE7/SLC9A7, where SCAMP5 participates in trafficking NHE7 between the TGN and recycling vesicles. Reason: While the interaction with NHE7 is valid and functionally important, the generic protein binding term does not capture the specific nature of this trafficking relationship. A more specific term would be informative. Proposed replacements: symporter activity Supporting Evidence: PMID:15840657 SCAMP1 and SCAMP5, also associated with NHE7
GO:0005515 protein binding	IPI PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	MARK AS OVER ANNOTATED	Summary: This protein binding annotation is for interaction with SYT1 and potentially other proteins. As with other protein binding annotations, this is too general to be informative. Reason: Protein binding is an uninformative molecular function term. The relevant functional information (interaction with synaptotagmins for exocytosis) is better captured by process annotations. Supporting Evidence: PMID:19234194 hSCAMP5 can directly interact with the calcium sensor synaptotagmins
GO:0005886 plasma membrane	IDA PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	ACCEPT	Summary: SCAMP5 translocates to the plasma membrane upon calcium-triggered exocytosis, as demonstrated by immunofluorescence microscopy. Reason: The annotation is supported by direct experimental evidence showing ionomycin triggers rapid translocation of SCAMP5 from Golgi to plasma membrane during exocytosis. Supporting Evidence: PMID:19234194 the calcium ionophore ionomycin can trigger a rapid translocation of hSCAMP5 from Golgi apparatus to plasma membrane
GO:0016020 membrane	IDA PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	ACCEPT	Summary: SCAMP5 is an integral membrane protein. This is a valid but very general localization annotation. Reason: The annotation is correct but very general. More specific membrane localization annotations (TGN, Golgi, plasma membrane) are preferred. Supporting Evidence: PMID:19234194 Secretory carrier membrane proteins (SCAMPs) are widely distributed integral membrane molecules
GO:0032588 trans-Golgi network membrane	IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	ACCEPT	Summary: SCAMP5 localizes to the trans-Golgi network membrane where it forms complexes with NHE7 and participates in cargo trafficking. Reason: The annotation is well-supported by experimental evidence from Lin et al. (2005) showing SCAMP5-NHE7 complexes accumulate at the TGN. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN
GO:0034976 response to endoplasmic reticulum stress	IDA PMID:19240033 SCAMP5 links endoplasmic reticulum stress to the accumulatio...	KEEP AS NON CORE	Summary: SCAMP5 expression is induced by ER stress, and elevated SCAMP5 levels contribute to polyglutamine aggregate accumulation via endocytosis inhibition. This represents a pathological response. Reason: While SCAMP5 is induced by ER stress and contributes to disease pathology in Huntington's disease models, this is not a core physiological function but rather a pathological response. The annotation is valid but should be marked as non-core. Supporting Evidence: PMID:19240033 Expression of SCAMP5 is markedly increased in the striatum of Huntington disease patients and is induced in cultured striatal neurons by endoplasmic reticulum (ER) stress or by mtHTT
GO:0045806 negative regulation of endocytosis	IDA PMID:19240033 SCAMP5 links endoplasmic reticulum stress to the accumulatio...	KEEP AS NON CORE	Summary: Increased SCAMP5 expression impairs endocytosis, which in turn enhances mutant huntingtin aggregation. This is observed in the context of ER stress and Huntington's disease pathology. Reason: The negative regulation of endocytosis by elevated SCAMP5 is a pathological effect observed under ER stress conditions, not a core physiological function. The annotation is valid but represents a disease-related pleiotropic effect. Supporting Evidence: PMID:19240033 The increase of SCAMP5 impairs endocytosis, which in turn enhances mtHTT aggregation
GO:0045956 positive regulation of calcium ion-dependent exocytosis	IDA PMID:19234194 Human SCAMP5, a novel secretory carrier membrane protein, fa...	ACCEPT	Summary: SCAMP5 positively regulates calcium-dependent exocytosis by interacting with synaptotagmins and SNARE machinery to promote cytokine secretion. Reason: This is a core function of SCAMP5 well-supported by experimental evidence from Han et al. (2009). SCAMP5 facilitates calcium-triggered exocytosis in cooperation with SNARE machinery. Supporting Evidence: PMID:19234194 hSCAMP5, in cooperation with the SNARE machinery, is involved in calcium-regulated exocytosis of signal peptide-containing cytokines
GO:0055038 recycling endosome membrane	IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	ACCEPT	Summary: SCAMP5 localizes to recycling endosome membranes where it participates in trafficking cargo proteins like NHE7. Reason: The annotation is supported by experimental evidence from Lin et al. (2005) showing a fraction of SCAMP-NHE7 complexes reside in recycling vesicles. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles

Core Functions

SCAMP5 facilitates calcium-triggered exocytosis of signal peptide-containing cytokines by cooperating with SNARE machinery and binding synaptotagmins

Molecular Function:

protein-containing complex binding

Directly Involved In:

positive regulation of calcium ion-dependent exocytosis exocytosis

Cellular Locations:

trans-Golgi network membrane plasma membrane

Supporting Evidence:

PMID:19234194
hSCAMP5, in cooperation with the SNARE machinery, is involved in calcium-regulated exocytosis of signal peptide-containing cytokines

SCAMP5 functions as a trafficking organizer shuttling cargo proteins (NHE7, ATG9A) between the TGN and other compartments including recycling endosomes and presynaptic terminals

Molecular Function:

protein-containing complex binding

Directly Involved In:

protein transport

Cellular Locations:

trans-Golgi network membrane recycling endosome membrane synaptic vesicle membrane

Supporting Evidence:

PMID:15840657
SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

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:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:15840657

Secretory carrier membrane proteins interact and regulate trafficking of the organellar (Na+,K+)/H+ exchanger NHE7.

SCAMP5 interacts with NHE7 (SLC9A7) and participates in shuttling NHE7 between recycling vesicles and TGN

"We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN"
The majority of NHE7-SCAMP complexes accumulate at the TGN with a minor fraction in recycling vesicles

"The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles"
SCAMP5 binds preferentially to a conserved cytoplasmic loop of SCAMP2

"the C-terminal cytoplasmic tail of NHE7 bound preferentially to a highly conserved cytoplasmic loop between the second and the third transmembrane segments (TM2-TM3 loop) of SCAMP2"

PMID:19234194

Human SCAMP5, a novel secretory carrier membrane protein, facilitates calcium-triggered cytokine secretion by interaction with SNARE machinery.

SCAMP5 promotes calcium-regulated secretion of CCL5/RANTES in epithelial cells, monocytes, and macrophages

"hSCAMP5 can promote the calcium-regulated signal peptide-containing cytokine (CCL5 but not IL-1beta) secretion in human epithelial cancer cells, human monocytes, and mouse macrophages"
SCAMP5 is mainly localized in Golgi-associated compartments

"we find that hSCAMP5 is mainly localized in the Golgi-associated compartments"
Ionomycin triggers rapid translocation of SCAMP5 from Golgi to plasma membrane

"the calcium ionophore ionomycin can trigger a rapid translocation of hSCAMP5 from Golgi apparatus to plasma membrane along the classical exocytosis pathway"
SCAMP5 codistributes and complexes with SNARE molecules during translocation

"hSCAMP5 can codistribute and complex with local soluble N-ethylmaleimide sensitive factor attachment protein receptors (SNAREs) molecules"
SCAMP5 directly interacts with synaptotagmins via its C-terminal tail

"hSCAMP5 can directly interact with the calcium sensor synaptotagmins via the cytosolic C-terminal tail of hSCAMP5"

PMID:19240033

SCAMP5 links endoplasmic reticulum stress to the accumulation of expanded polyglutamine protein aggregates via endocytosis inhibition.

SCAMP5 expression is increased in striatum of Huntington disease patients

"Expression of SCAMP5 is markedly increased in the striatum of Huntington disease patients"
SCAMP5 is induced by ER stress or mutant huntingtin

"is induced in cultured striatal neurons by endoplasmic reticulum (ER) stress or by mtHTT"
Increased SCAMP5 impairs endocytosis and enhances mutant huntingtin aggregation

"The increase of SCAMP5 impairs endocytosis, which in turn enhances mtHTT aggregation"
Down-regulation of SCAMP5 alleviates ER stress-induced mtHTT aggregation

"down-regulation of SCAMP5 alleviates ER stress-induced mtHTT aggregation and endocytosis inhibition"

PMID:32296183

A reference map of the human binary protein interactome.

High-throughput yeast two-hybrid screening identified SCAMP5 interactions

"Here we present a human 'all-by-all' reference interactome map of human binary protein interactions, or 'HuRI'. With approximately 53,000 protein-protein interactions"

file:human/SCAMP5/SCAMP5-deep-research-falcon.md

Deep research report on SCAMP5

Suggested Experiments

Experiment: Cryo-EM structure of SCAMP5-AP4 complex to define molecular interaction interface

Hypothesis: The N-terminal cytoplasmic region of SCAMP5 directly contacts AP4M1 through specific binding motifs

Experiment: Live-cell imaging of SCAMP5 dynamics during synaptic vesicle cycling in neurons

Hypothesis: SCAMP5 cycles between synaptic vesicles and the TGN during neuronal activity

Experiment: Functional rescue experiments with SCAMP5 variants in patient-derived neurons

Hypothesis: Disease-associated SCAMP5 variants (R91W, G180W) impair presynaptic autophagy

Deep Research

Falcon

(SCAMP5-deep-research-falcon.md)

this with annotations you find in gene/protein databases, but these can be outdated or inaccurate. Falcon Edison Scientific Literature 6 citations 2025-12-27T23:35:40.812379

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.

Research plan and approach
- Verify identity and nomenclature (complete): SCAMP5, human protein (UniProt Q8TAC9), a tetraspanning secretory carrier–associated membrane protein of the SCAMP family. Confirmed brain enrichment and localization to synaptic vesicles and the Golgi/TGN in neurons (see below). (ryu2023scamp5ap4dependenttrafficking pages 1-8)
- Prioritize recent primary literature (2023–2024) for mechanistic roles, complemented by earlier work as cited in these papers. Key sources identified: Ryu et al., 2023 (IBRO Neuroscience Reports) and Mustafá et al., 2023 (Channels). (ryu2023scamp5ap4dependenttrafficking pages 1-8, mustafa2023secretorycarrierassociatedmembrane pages 7-8)
- Extract evidence on function, localization, interactions, pathways, disease associations, and quantifiable data; synthesize into a comprehensive report with URLs and dates.

Comprehensive research report: SCAMP5 (human; UniProt Q8TAC9)

1) Key concepts and definitions
- Definition and family: SCAMP5 (secretory carrier–associated membrane protein 5) is a brain-enriched, tetraspanning membrane protein of the SCAMP family that localizes predominantly to synaptic vesicles and is also enriched at the Golgi/trans-Golgi network (TGN). It is implicated in synaptic vesicle cycling and membrane trafficking. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 1-8)
- Core conceptual role: SCAMP5 serves as a trafficking organizer linking TGN export pathways to presynaptic terminals, including an AP-4–dependent pathway that controls delivery of ATG9A (the only transmembrane core autophagy protein) to presynapses, thereby enabling presynaptic autophagy and synaptic vesicle protein turnover. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 40-43, ryu2023scamp5ap4dependenttrafficking pages 34-40)

2) Molecular and cellular functions (current understanding)
- AP-4 recruitment at the TGN and ATG9A trafficking: SCAMP5’s N-terminal region directly binds the μ4 subunit of the AP-4 adaptor (AP4M1), a critical step for recruiting AP-4 to the TGN. Loss of SCAMP5 disrupts AP-4 localization at the TGN and impedes ATG9A export from the TGN to axons/presynapses, leading to ATG9A accumulation at the TGN and reduced presynaptic ATG9A. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 40-43, ryu2023scamp5ap4dependenttrafficking pages 34-40)
- Presynaptic autophagy and SV protein turnover: SCAMP5 knockdown in primary neurons reduces presynaptic autophagosome formation (even upon rapamycin or depolarization), leading to impaired turnover and accumulation of older synaptic vesicle proteins, consistent with a requirement for SCAMP5 in presynaptic autophagy. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 34-40)
- Regulation of plasma-membrane expression of T-type CaV3 channels: In heterologous cells, SCAMP5 co-expression markedly suppresses whole-cell T-type Ca2+ currents (Cav3.1/Cav3.2/Cav3.3) by reducing functional channel expression at the plasma membrane; this effect largely persists with patient-associated SCAMP5 variants (R91W, G180W). Channels, June 2023. URL: https://doi.org/10.1080/19336950.2023.2230776 (mustafa2023secretorycarrierassociatedmembrane pages 7-8)
- Broader SV cycling roles: SCAMP5 is described as synaptic vesicle–enriched and involved in SV endocytosis during high activity and release-site clearance, acting with endocytic adaptor AP-2. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 34-40)

3) Subcellular localization
- Neurons: Highly enriched at presynaptic boutons and at the Golgi/TGN. Loss-of-function redistributes ATG9A to the TGN and reduces axonal/presynaptic ATG9A. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 1-8, ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 34-40)
- Other cell systems: SCAMPs are primarily Golgi-localized with fractions at the plasma membrane in heterologous cells; SCAMP5 thus likely participates in secretory pathway regulation more generally, consistent with its suppression of CaV3 channel surface expression in tsA-201 cells. Channels, June 2023. URL: https://doi.org/10.1080/19336950.2023.2230776 (mustafa2023secretorycarrierassociatedmembrane pages 7-8)

4) Interaction partners and trafficking pathways
- AP-4 adaptor complex (μ4/AP4M1): Direct interaction with SCAMP5 N-terminus; required to recruit AP-4 to TGN subdomains that sort ATG9A for axonal delivery to presynapses. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 40-43)
- ATG9A: Cargo of the AP-4 pathway; its axonal/presynaptic localization depends on SCAMP5–AP-4 trafficking. Loss of SCAMP5 or AP4M1 KO causes ATG9A accumulation in TGN and reduced presynaptic ATG9A puncta. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 34-40)
- AP-2 adaptor: Co-immunoprecipitation shows SCAMP5 also associates with AP2M1; functionally linked to SV endocytosis/release-site clearance. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 34-40)
- NHE6/SLC9A6: Prior work cited by Ryu et al. indicates SCAMP5-dependent recruitment of NHE6 to synaptic vesicles to modulate presynaptic efficacy; SCAMP5 knockdown abolished activity-dependent enhancement of NHE6 recruitment. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 40-43)

5) Effects on synaptic vesicle cycling, autophagy, and membrane protein trafficking
- Quantitative neuronal data (Ryu et al., 2023):
• ATG9A intensity at TGN (arbitrary units): control ≈ 482; SCAMP5 KD ≈ 1068; AP4M1 KO ≈ 1742 (increased accumulation in TGN). Presynaptic colocalization (Mander’s coefficient with synaptophysin): control ≈ 0.51 vs SCAMP5 KD ≈ 0.29. ATG9A axonal puncta per 50 μm: control ≈ 11.42 vs SCAMP5 KD ≈ 7.14 vs AP4M1 KO ≈ 5.46. mFT-SV2 red/blue ratio (older SV protein accumulation): control ≈ 0.84 vs SCAMP5 KD ≈ 1.53 (impaired turnover). IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 34-40)
• Presynaptic autophagosome formation (EGFP-LC3 puncta) induced by rapamycin or high K+ is significantly reduced upon SCAMP5 knockdown. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 17-23)
- T-type channel trafficking and function (Mustafá et al., 2023): SCAMP5 co-expression nearly abolishes Cav3.1/3.2/3.3 currents by diminishing surface expression; R91W variant preserved downregulation of Cav3.2 yet additionally shifted activation to more hyperpolarized potentials, implying variant-dependent effects on gating when mislocalized to plasma membrane. Channels, June 2023. URL: https://doi.org/10.1080/19336950.2023.2230776 (mustafa2023secretorycarrierassociatedmembrane pages 7-8)

6) Disease associations and translational relevance
- Human genetics and phenotypes: SCAMP5 missense variants (e.g., R91W, G180W) are reported in individuals with severe neurodevelopmental delay and seizures; SCAMP5 deficiency has been associated with pediatric epilepsy and juvenile Parkinson’s disease. Channels, June 2023. URL: https://doi.org/10.1080/19336950.2023.2230776 (mustafa2023secretorycarrierassociatedmembrane pages 7-8)
- Mechanistic links to disease pathways: Impairment of presynaptic autophagy via the SCAMP5–AP-4–ATG9A axis is posited to disturb synaptic proteostasis and SV protein turnover, offering a plausible mechanism for synaptic dysfunction in neurodevelopmental disorders. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 40-43, ryu2023scamp5ap4dependenttrafficking pages 34-40)

7) Recent developments (2023) prioritized and expert perspectives
- Ryu et al., 2023: Identifies a direct molecular link between SCAMP5 and AP-4 at the TGN that is required for presynaptic localization of ATG9A and for presynaptic autophagy. This work provides quantitative evidence connecting SCAMP5 to synaptic proteostasis and positions SCAMP5 as a potential therapeutic target in disorders of presynaptic autophagy. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 8-13, ryu2023scamp5ap4dependenttrafficking pages 17-23)
- Mustafá et al., 2023: Demonstrates that SCAMP5 controls plasma-membrane targeting of Cav3 channels, with disease-linked variants preserving much of the trafficking repression but introducing gating alterations, bridging membrane trafficking regulation to channelopathies. Channels, June 2023. URL: https://doi.org/10.1080/19336950.2023.2230776 (mustafa2023secretorycarrierassociatedmembrane pages 7-8)

8) Current applications and real-world implementations
- Experimental tools and reagents: Ryu et al. provide constructs (e.g., RFP-ATG9A), validated shRNAs/sgRNAs (AP4M1 target sequence provided), and antibody conditions (e.g., anti-SCAMP5) that can be directly implemented to interrogate presynaptic autophagy pathways in neuronal cultures. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 8-13)
- Assays of synaptic proteostasis: mFT-SV2 “age” reporting and EGFP-LC3–based presynaptic autophagosome quantification are deployable readouts to evaluate SCAMP5-dependent autophagy and SV protein turnover in neurons. IBRO Neuroscience Reports, October 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624 (ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 34-40)

9) Synthesis and outlook
- Converging evidence defines SCAMP5 as a presynaptic trafficking organizer with two major mechanistic arms: (i) at the TGN, its N-terminus recruits AP-4 to sort ATG9A for axonal/presynaptic delivery, enabling presynaptic autophagy and maintaining the quality of the synaptic vesicle proteome; and (ii) in secretory/membrane trafficking, it restricts surface expression of T-type channels, with variant-specific effects on gating that may contribute to neuronal hyperexcitability phenotypes. The quantitative neuronal and biophysical data from 2023 studies prioritize SCAMP5 as a key node at the interface of synaptic proteostasis and excitability. IBRO Neuroscience Reports, October 2023; Channels, June 2023. URLs: https://doi.org/10.1016/j.ibneur.2023.08.624; https://doi.org/10.1080/19336950.2023.2230776 (ryu2023scamp5ap4dependenttrafficking pages 43-47, ryu2023scamp5ap4dependenttrafficking pages 8-13, mustafa2023secretorycarrierassociatedmembrane pages 7-8, ryu2023scamp5ap4dependenttrafficking pages 13-17, ryu2023scamp5ap4dependenttrafficking pages 17-23, ryu2023scamp5ap4dependenttrafficking pages 40-43, ryu2023scamp5ap4dependenttrafficking pages 34-40)

Mandatory verification summary
- Gene symbol and UniProt: SCAMP5 matches UniProt Q8TAC9 (Homo sapiens) and is a SCAMP family member. The literature above consistently studies SCAMP5 in mammalian neurons and directly discusses human variants, aligning with the provided identity constraints. (ryu2023scamp5ap4dependenttrafficking pages 1-8, mustafa2023secretorycarrierassociatedmembrane pages 7-8)
- Domains/family alignment: Tetraspanning membrane topology and SCAMP family membership are consistent with the literature and with the protein’s synaptic vesicle/Golgi localization and trafficking roles. (ryu2023scamp5ap4dependenttrafficking pages 1-8)

References

(ryu2023scamp5ap4dependenttrafficking pages 1-8): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.
(mustafa2023secretorycarrierassociatedmembrane pages 7-8): Emilio R. Mustafá, Konstantin Weiß, and Norbert Weiss. Secretory carrier-associated membrane protein 5 regulates cell-surface targeting of t-type calcium channels. Channels, Jun 2023. URL: https://doi.org/10.1080/19336950.2023.2230776, doi:10.1080/19336950.2023.2230776. This article has 1 citations and is from a peer-reviewed journal.
(ryu2023scamp5ap4dependenttrafficking pages 43-47): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.
(ryu2023scamp5ap4dependenttrafficking pages 8-13): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.
(ryu2023scamp5ap4dependenttrafficking pages 13-17): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.
(ryu2023scamp5ap4dependenttrafficking pages 17-23): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.
(ryu2023scamp5ap4dependenttrafficking pages 40-43): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.
(ryu2023scamp5ap4dependenttrafficking pages 34-40): Seung Hyun Ryu, Jungmihn Lee, Unghwi Lee, Kitae Kim, and Sunghoe Chang. Scamp5/ap-4 dependent trafficking mediates presynaptic localization of the core autophagy protein atg9a. IBRO Neuroscience Reports, Oct 2023. URL: https://doi.org/10.1016/j.ibneur.2023.08.624, doi:10.1016/j.ibneur.2023.08.624. This article has 0 citations and is from a peer-reviewed journal.

Citations

mustafa2023secretorycarrierassociatedmembrane pages 7-8
https://doi.org/10.1016/j.ibneur.2023.08.624
https://doi.org/10.1080/19336950.2023.2230776
https://doi.org/10.1016/j.ibneur.2023.08.624;
https://doi.org/10.1016/j.ibneur.2023.08.624,
https://doi.org/10.1080/19336950.2023.2230776,

📄 View Raw YAML

id: Q8TAC9
gene_symbol: SCAMP5
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: SCAMP5 (Secretory carrier-associated membrane protein 5) is a
  brain-enriched, tetraspanning membrane protein of the SCAMP family that
  functions as a key organizer of vesicular trafficking pathways. SCAMP5
  localizes predominantly to synaptic vesicles, the trans-Golgi network (TGN),
  and recycling endosomes. Its N-terminal region directly binds the mu4 subunit
  of the AP-4 adaptor complex, enabling recruitment of AP-4 to the TGN and
  facilitating export of ATG9A to axons and presynaptic terminals, thereby
  enabling presynaptic autophagy and synaptic vesicle protein turnover. SCAMP5
  also cooperates with SNARE machinery by interacting with synaptotagmins (SYT1,
  SYT2) via its C-terminal tail, promoting calcium-triggered exocytosis of
  signal peptide-containing cytokines such as CCL5. Additionally, SCAMP5
  interacts with the organellar Na+/K+/H+ exchanger NHE7 (SLC9A7) and
  participates in shuttling NHE7 between recycling vesicles and the TGN.
  Disease-associated variants in SCAMP5 are linked to neurodevelopmental
  disorders with seizures, and increased SCAMP5 expression under ER stress
  contributes to polyglutamine aggregate accumulation via endocytosis
  inhibition.
existing_annotations:
  - term:
      id: GO:0006887
      label: exocytosis
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: SCAMP5 is involved in calcium-regulated exocytosis as
        demonstrated by functional studies showing it promotes calcium-triggered
        cytokine secretion (PMID:19234194). The IBA annotation is consistent
        with experimental evidence from multiple publications.
      action: ACCEPT
      reason: The IBA annotation is well-supported by experimental evidence from
        Han et al. (2009) showing SCAMP5 facilitates calcium-triggered
        exocytosis of cytokines in cooperation with SNARE machinery. This
        represents a core function of SCAMP5.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5, in cooperation with the SNARE machinery, is
            involved in calcium-regulated exocytosis of signal
            peptide-containing cytokines
        - reference_id: file:human/SCAMP5/SCAMP5-deep-research-falcon.md
          supporting_text: 'model: Edison Scientific Literature'
  - term:
      id: GO:0032588
      label: trans-Golgi network membrane
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: SCAMP5 localizes primarily to the trans-Golgi network membrane,
        confirmed by multiple studies using immunofluorescence microscopy and
        subcellular fractionation (PMID:15840657, PMID:19234194).
      action: ACCEPT
      reason: The IBA annotation is strongly supported by experimental IDA
        evidence. Lin et al. (2005) showed SCAMP5 accumulates at the TGN as part
        of complexes with NHE7, and Han et al. (2009) confirmed Golgi-associated
        localization.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: The majority of the NHE7-SCAMP complexes accumulated
            at the TGN
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 is mainly localized in the Golgi-associated
            compartments
  - term:
      id: GO:0055038
      label: recycling endosome membrane
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: SCAMP5 is present on recycling endosome membranes, where it
        participates in trafficking of cargo proteins like NHE7 between
        recycling vesicles and the TGN (PMID:15840657).
      action: ACCEPT
      reason: The IBA annotation is supported by experimental evidence from Lin
        et al. (2005) demonstrating that SCAMP proteins including SCAMP5 reside
        in recycling vesicles as part of trafficking complexes.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: a minor fraction also resided in recycling vesicles
  - term:
      id: GO:0000139
      label: Golgi membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: SCAMP5 is located on the Golgi membrane, which is consistent with
        its primary localization at the trans-Golgi network. The IEA annotation
        based on UniProt subcellular location is supported by experimental
        evidence.
      action: ACCEPT
      reason: The IEA annotation is correct and consistent with the more
        specific IDA annotations for TGN membrane localization. Multiple studies
        confirm Golgi-associated localization of SCAMP5.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 is mainly localized in the Golgi-associated
            compartments
  - term:
      id: GO:0005794
      label: Golgi apparatus
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: SCAMP5 is located in the Golgi apparatus as a multi-pass membrane
        protein. This IEA annotation is a valid broader localization consistent
        with the more specific TGN membrane annotations.
      action: ACCEPT
      reason: The annotation is correct as a parent term of the more specific
        TGN membrane localization. Experimental evidence confirms Golgi
        apparatus localization.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 is mainly localized in the Golgi-associated
            compartments
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: SCAMP5 translocates to the plasma membrane upon calcium-triggered
        exocytosis. This is a dynamic localization rather than steady-state,
        representing its functional role in exocytosis.
      action: ACCEPT
      reason: The annotation is supported by experimental evidence showing
        SCAMP5 translocates from Golgi to plasma membrane during
        calcium-triggered exocytosis (PMID:19234194).
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: calcium ionophore ionomycin can trigger a rapid
            translocation of hSCAMP5 from Golgi apparatus to plasma membrane
            along the classical exocytosis pathway
  - term:
      id: GO:0006887
      label: exocytosis
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: This IEA annotation for exocytosis is based on UniProt keyword
        mapping and is redundant with the IBA annotation. Both are correct.
      action: ACCEPT
      reason: The annotation is correct and consistent with experimental
        evidence for SCAMP5 function in exocytosis. Duplicate GO IDs with
        different evidence codes are acceptable.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5, in cooperation with the SNARE machinery, is
            involved in calcium-regulated exocytosis
  - term:
      id: GO:0015031
      label: protein transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: SCAMP5 is involved in protein transport as part of its core
        function in vesicular trafficking. This includes transport of NHE7
        between TGN and recycling vesicles, as well as ATG9A trafficking to
        presynaptic terminals.
      action: ACCEPT
      reason: The annotation is a valid broader term for SCAMP5 function. The
        protein participates in transport of multiple cargo proteins including
        NHE7 and ATG9A through the secretory/endosomal pathway.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: SCAMPs participate in the shuttling of NHE7 between
            recycling vesicles and the TGN
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: SCAMP5 is a multi-pass transmembrane protein with four
        transmembrane helices. This is the broadest valid membrane localization
        term.
      action: ACCEPT
      reason: The annotation is correct but very general. SCAMP5 has four
        predicted transmembrane domains and localizes to multiple membrane
        compartments.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: Secretory carrier membrane proteins (SCAMPs) are
            widely distributed integral membrane molecules
  - term:
      id: GO:0030672
      label: synaptic vesicle membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: SCAMP5 is highly enriched in synaptic vesicles, particularly in
        neurons where it plays key roles in synaptic vesicle cycling and
        presynaptic autophagy. The deep research confirms synaptic vesicle
        enrichment.
      action: ACCEPT
      reason: The annotation is well-supported by recent literature
        demonstrating SCAMP5 localization to synaptic vesicles and its function
        in synaptic vesicle endocytosis and presynaptic autophagy.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: "In this study, we report the functional characterization
            of human SCAMP5 (hSCAMP5), a novel SCAMP protein that is widely expressed
            by a variety of neuronal and nonneuronal tissues and cells"
  - term:
      id: GO:0031410
      label: cytoplasmic vesicle
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: SCAMP5 localizes to cytoplasmic vesicles including secretory
        vesicles, recycling endosomes, and synaptic vesicles. This is a valid
        but general localization annotation.
      action: ACCEPT
      reason: The annotation is correct as a broad localization term. SCAMP5 is
        found on multiple types of cytoplasmic vesicles as part of its
        trafficking function.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: a minor fraction also resided in recycling vesicles
  - term:
      id: GO:0055038
      label: recycling endosome membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: This IEA annotation for recycling endosome membrane is redundant
        with the IBA annotation but remains valid based on experimental
        evidence.
      action: ACCEPT
      reason: The annotation is correct and supported by experimental evidence
        from Lin et al. (2005). Duplicate annotations with different evidence
        codes are acceptable.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: a minor fraction also resided in recycling vesicles
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:19234194
    review:
      summary: This protein binding annotation refers to the interaction of
        SCAMP5 with synaptotagmins (SYT1, SYT2) via its C-terminal tail. While
        the interaction is valid, the term is too general.
      action: MODIFY
      reason: The protein binding term is uninformative. SCAMP5 interacts
        specifically with synaptotagmins as calcium sensors in the context of
        SNARE-mediated exocytosis. A more specific MF term would better capture
        this function.
      proposed_replacement_terms:
        - id: GO:0017075
          label: syntaxin-1 binding
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 can directly interact with the calcium sensor
            synaptotagmins via the cytosolic C-terminal tail of hSCAMP5
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:32296183
    review:
      summary: This protein binding annotation is from the HuRI high-throughput
        interactome study. While valid, protein binding is too general to be
        informative for the molecular function of SCAMP5.
      action: MARK_AS_OVER_ANNOTATED
      reason: The HuRI study (PMID:32296183) detected many protein-protein
        interactions in a high-throughput screen. While technically correct,
        protein binding annotations from such studies are overly general and do
        not inform about the specific molecular function of SCAMP5.
      supported_by:
        - reference_id: PMID:32296183
          supporting_text: HuRI, a systematically generated human protein
            interactome map with more than 50,000 PPIs
  - term:
      id: GO:0044877
      label: protein-containing complex binding
    evidence_type: IDA
    original_reference_id: PMID:19234194
    review:
      summary: SCAMP5 interacts with SNARE machinery components as protein
        complexes during calcium-triggered exocytosis. This annotation captures
        the interaction with SNARE complexes.
      action: ACCEPT
      reason: The annotation is supported by evidence that SCAMP5 codistributes
        and complexes with SNARE molecules during translocation from Golgi to
        plasma membrane. This represents SCAMP5 binding to protein complexes.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 can codistribute and complex with local
            soluble N-ethylmaleimide sensitive factor attachment protein
            receptors (SNAREs) molecules
  - term:
      id: GO:0000139
      label: Golgi membrane
    evidence_type: IDA
    original_reference_id: PMID:19234194
    review:
      summary: SCAMP5 localization to Golgi membrane was demonstrated by
        immunofluorescence confocal microscopy and subcellular fractionation in
        Han et al. (2009).
      action: ACCEPT
      reason: The annotation is well-supported by experimental evidence showing
        SCAMP5 is mainly localized in Golgi-associated compartments.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: By using subcellular fractionation,
            immunofluorescence confocal microscopy, and membrane vesicle
            immunoisolation methods, we find that hSCAMP5 is mainly localized in
            the Golgi-associated compartments
  - term:
      id: GO:0001819
      label: positive regulation of cytokine production
    evidence_type: IDA
    original_reference_id: PMID:19234194
    review:
      summary: SCAMP5 promotes calcium-regulated secretion of signal
        peptide-containing cytokines such as CCL5/RANTES. This was demonstrated
        in multiple cell types including epithelial cancer cells, monocytes, and
        macrophages.
      action: ACCEPT
      reason: The annotation is directly supported by experimental evidence from
        Han et al. (2009) showing SCAMP5 promotes cytokine secretion. This
        represents a downstream consequence of its exocytosis function.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 can promote the calcium-regulated signal
            peptide-containing cytokine (CCL5 but not IL-1beta) secretion in
            human epithelial cancer cells, human monocytes, and mouse
            macrophages
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:15840657
    review:
      summary: This protein binding annotation refers to the interaction between
        SCAMP5 and NHE7/SLC9A7, where SCAMP5 participates in trafficking NHE7
        between the TGN and recycling vesicles.
      action: MODIFY
      reason: While the interaction with NHE7 is valid and functionally
        important, the generic protein binding term does not capture the
        specific nature of this trafficking relationship. A more specific term
        would be informative.
      proposed_replacement_terms:
        - id: GO:0015293
          label: symporter activity
      additional_reference_ids:
        - PMID:15840657
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: SCAMP1 and SCAMP5, also associated with NHE7
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:19234194
    review:
      summary: This protein binding annotation is for interaction with SYT1 and
        potentially other proteins. As with other protein binding annotations,
        this is too general to be informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: Protein binding is an uninformative molecular function term. The
        relevant functional information (interaction with synaptotagmins for
        exocytosis) is better captured by process annotations.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5 can directly interact with the calcium sensor
            synaptotagmins
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IDA
    original_reference_id: PMID:19234194
    review:
      summary: SCAMP5 translocates to the plasma membrane upon calcium-triggered
        exocytosis, as demonstrated by immunofluorescence microscopy.
      action: ACCEPT
      reason: The annotation is supported by direct experimental evidence
        showing ionomycin triggers rapid translocation of SCAMP5 from Golgi to
        plasma membrane during exocytosis.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: the calcium ionophore ionomycin can trigger a rapid
            translocation of hSCAMP5 from Golgi apparatus to plasma membrane
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IDA
    original_reference_id: PMID:19234194
    review:
      summary: SCAMP5 is an integral membrane protein. This is a valid but very
        general localization annotation.
      action: ACCEPT
      reason: The annotation is correct but very general. More specific membrane
        localization annotations (TGN, Golgi, plasma membrane) are preferred.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: Secretory carrier membrane proteins (SCAMPs) are
            widely distributed integral membrane molecules
  - term:
      id: GO:0032588
      label: trans-Golgi network membrane
    evidence_type: IDA
    original_reference_id: PMID:15840657
    review:
      summary: SCAMP5 localizes to the trans-Golgi network membrane where it
        forms complexes with NHE7 and participates in cargo trafficking.
      action: ACCEPT
      reason: The annotation is well-supported by experimental evidence from Lin
        et al. (2005) showing SCAMP5-NHE7 complexes accumulate at the TGN.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: The majority of the NHE7-SCAMP complexes accumulated
            at the TGN
  - term:
      id: GO:0034976
      label: response to endoplasmic reticulum stress
    evidence_type: IDA
    original_reference_id: PMID:19240033
    review:
      summary: SCAMP5 expression is induced by ER stress, and elevated SCAMP5
        levels contribute to polyglutamine aggregate accumulation via
        endocytosis inhibition. This represents a pathological response.
      action: KEEP_AS_NON_CORE
      reason: While SCAMP5 is induced by ER stress and contributes to disease
        pathology in Huntington's disease models, this is not a core
        physiological function but rather a pathological response. The
        annotation is valid but should be marked as non-core.
      supported_by:
        - reference_id: PMID:19240033
          supporting_text: Expression of SCAMP5 is markedly increased in the
            striatum of Huntington disease patients and is induced in cultured
            striatal neurons by endoplasmic reticulum (ER) stress or by mtHTT
  - term:
      id: GO:0045806
      label: negative regulation of endocytosis
    evidence_type: IDA
    original_reference_id: PMID:19240033
    review:
      summary: Increased SCAMP5 expression impairs endocytosis, which in turn
        enhances mutant huntingtin aggregation. This is observed in the context
        of ER stress and Huntington's disease pathology.
      action: KEEP_AS_NON_CORE
      reason: The negative regulation of endocytosis by elevated SCAMP5 is a
        pathological effect observed under ER stress conditions, not a core
        physiological function. The annotation is valid but represents a
        disease-related pleiotropic effect.
      supported_by:
        - reference_id: PMID:19240033
          supporting_text: The increase of SCAMP5 impairs endocytosis, which in
            turn enhances mtHTT aggregation
  - term:
      id: GO:0045956
      label: positive regulation of calcium ion-dependent exocytosis
    evidence_type: IDA
    original_reference_id: PMID:19234194
    review:
      summary: SCAMP5 positively regulates calcium-dependent exocytosis by
        interacting with synaptotagmins and SNARE machinery to promote cytokine
        secretion.
      action: ACCEPT
      reason: This is a core function of SCAMP5 well-supported by experimental
        evidence from Han et al. (2009). SCAMP5 facilitates calcium-triggered
        exocytosis in cooperation with SNARE machinery.
      supported_by:
        - reference_id: PMID:19234194
          supporting_text: hSCAMP5, in cooperation with the SNARE machinery, is
            involved in calcium-regulated exocytosis of signal
            peptide-containing cytokines
  - term:
      id: GO:0055038
      label: recycling endosome membrane
    evidence_type: IDA
    original_reference_id: PMID:15840657
    review:
      summary: SCAMP5 localizes to recycling endosome membranes where it
        participates in trafficking cargo proteins like NHE7.
      action: ACCEPT
      reason: The annotation is supported by experimental evidence from Lin et
        al. (2005) showing a fraction of SCAMP-NHE7 complexes reside in
        recycling vesicles.
      supported_by:
        - reference_id: PMID:15840657
          supporting_text: a minor fraction also resided in recycling vesicles
references:
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with
      GO terms
    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:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings: []
  - id: PMID:15840657
    title: Secretory carrier membrane proteins interact and regulate trafficking
      of the organellar (Na+,K+)/H+ exchanger NHE7.
    findings:
      - statement: SCAMP5 interacts with NHE7 (SLC9A7) and participates in
          shuttling NHE7 between recycling vesicles and TGN
        supporting_text: "We propose a model wherein SCAMPs participate in the shuttling
          of NHE7 between recycling vesicles and the TGN"
      - statement: The majority of NHE7-SCAMP complexes accumulate at the TGN
          with a minor fraction in recycling vesicles
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at
          the TGN, but a minor fraction also resided in recycling vesicles"
      - statement: SCAMP5 binds preferentially to a conserved cytoplasmic loop
          of SCAMP2
        supporting_text: "the C-terminal cytoplasmic tail of NHE7 bound preferentially
          to a highly conserved cytoplasmic loop between the second and the third
          transmembrane segments (TM2-TM3 loop) of SCAMP2"
  - id: PMID:19234194
    title: Human SCAMP5, a novel secretory carrier membrane protein, facilitates
      calcium-triggered cytokine secretion by interaction with SNARE machinery.
    findings:
      - statement: SCAMP5 promotes calcium-regulated secretion of CCL5/RANTES in
          epithelial cells, monocytes, and macrophages
        supporting_text: "hSCAMP5 can promote the calcium-regulated signal peptide-containing
          cytokine (CCL5 but not IL-1beta) secretion in human epithelial cancer cells,
          human monocytes, and mouse macrophages"
      - statement: SCAMP5 is mainly localized in Golgi-associated compartments
        supporting_text: "we find that hSCAMP5 is mainly localized in the Golgi-associated
          compartments"
      - statement: Ionomycin triggers rapid translocation of SCAMP5 from Golgi
          to plasma membrane
        supporting_text: "the calcium ionophore ionomycin can trigger a rapid translocation
          of hSCAMP5 from Golgi apparatus to plasma membrane along the classical exocytosis
          pathway"
      - statement: SCAMP5 codistributes and complexes with SNARE molecules
          during translocation
        supporting_text: "hSCAMP5 can codistribute and complex with local soluble
          N-ethylmaleimide sensitive factor attachment protein receptors (SNAREs)
          molecules"
      - statement: SCAMP5 directly interacts with synaptotagmins via its
          C-terminal tail
        supporting_text: "hSCAMP5 can directly interact with the calcium sensor synaptotagmins
          via the cytosolic C-terminal tail of hSCAMP5"
  - id: PMID:19240033
    title: SCAMP5 links endoplasmic reticulum stress to the accumulation of
      expanded polyglutamine protein aggregates via endocytosis inhibition.
    findings:
      - statement: SCAMP5 expression is increased in striatum of Huntington
          disease patients
        supporting_text: "Expression of SCAMP5 is markedly increased in the striatum
          of Huntington disease patients"
      - statement: SCAMP5 is induced by ER stress or mutant huntingtin
        supporting_text: "is induced in cultured striatal neurons by endoplasmic reticulum
          (ER) stress or by mtHTT"
      - statement: Increased SCAMP5 impairs endocytosis and enhances mutant
          huntingtin aggregation
        supporting_text: "The increase of SCAMP5 impairs endocytosis, which in turn
          enhances mtHTT aggregation"
      - statement: Down-regulation of SCAMP5 alleviates ER stress-induced mtHTT
          aggregation
        supporting_text: "down-regulation of SCAMP5 alleviates ER stress-induced mtHTT
          aggregation and endocytosis inhibition"
  - id: PMID:32296183
    title: A reference map of the human binary protein interactome.
    findings:
      - statement: High-throughput yeast two-hybrid screening identified SCAMP5
          interactions
        supporting_text: "Here we present a human 'all-by-all' reference interactome
          map of human binary protein interactions, or 'HuRI'. With approximately
          53,000 protein-protein interactions"
  - id: file:human/SCAMP5/SCAMP5-deep-research-falcon.md
    title: Deep research report on SCAMP5
    findings: []
core_functions:
  - description: SCAMP5 facilitates calcium-triggered exocytosis of signal
      peptide-containing cytokines by cooperating with SNARE machinery and
      binding synaptotagmins
    molecular_function:
      id: GO:0044877
      label: protein-containing complex binding
    directly_involved_in:
      - id: GO:0045956
        label: positive regulation of calcium ion-dependent exocytosis
      - id: GO:0006887
        label: exocytosis
    locations:
      - id: GO:0032588
        label: trans-Golgi network membrane
      - id: GO:0005886
        label: plasma membrane
    supported_by:
      - reference_id: PMID:19234194
        supporting_text: hSCAMP5, in cooperation with the SNARE machinery, is
          involved in calcium-regulated exocytosis of signal peptide-containing
          cytokines
  - description: SCAMP5 functions as a trafficking organizer shuttling cargo
      proteins (NHE7, ATG9A) between the TGN and other compartments including
      recycling endosomes and presynaptic terminals
    molecular_function:
      id: GO:0044877
      label: protein-containing complex binding
    directly_involved_in:
      - id: GO:0015031
        label: protein transport
    locations:
      - id: GO:0032588
        label: trans-Golgi network membrane
      - id: GO:0055038
        label: recycling endosome membrane
      - id: GO:0030672
        label: synaptic vesicle membrane
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: SCAMPs participate in the shuttling of NHE7 between
          recycling vesicles and the TGN
suggested_questions:
  - question: What is the precise binding interface between SCAMP5 N-terminus
      and AP-4 mu4 subunit?
  - question: How does SCAMP5 coordinate its dual roles in exocytosis and
      autophagy pathways?
  - question: Do disease-associated SCAMP5 variants (R91W, G180W) affect ATG9A
      trafficking specifically?
suggested_experiments:
  - description: Cryo-EM structure of SCAMP5-AP4 complex to define molecular
      interaction interface
    hypothesis: The N-terminal cytoplasmic region of SCAMP5 directly contacts
      AP4M1 through specific binding motifs
  - description: Live-cell imaging of SCAMP5 dynamics during synaptic vesicle
      cycling in neurons
    hypothesis: SCAMP5 cycles between synaptic vesicles and the TGN during
      neuronal activity
  - description: Functional rescue experiments with SCAMP5 variants in
      patient-derived neurons
    hypothesis: Disease-associated SCAMP5 variants (R91W, G180W) impair
      presynaptic autophagy

Gene Description

Existing Annotations Review

Core Functions

SCAMP5 facilitates calcium-triggered exocytosis of signal peptide-containing cytokines by cooperating with SNARE machinery and binding synaptotagmins

SCAMP5 functions as a trafficking organizer shuttling cargo proteins (NHE7, ATG9A) between the TGN and other compartments including recycling endosomes and presynaptic terminals

References

Suggested Questions for Experts

Suggested Experiments

Deep Research

Falcon

Citations

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