SCAMP2

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0006887 exocytosis	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation based on phylogenetic inference. SCAMP family proteins are implicated in regulated exocytosis based on their localization to secretory vesicles and functional studies showing roles in late steps of exocytosis (PMID:9378760, Hubbard et al. 2000). Reason: The annotation to exocytosis is well-supported by the known role of SCAMP proteins in secretory and endocytic membrane trafficking. SCAMPs are enriched on secretory granules and recycling carriers, and family-level studies support roles in regulated exocytosis. The IBA annotation is consistent with SCAMP2's documented functions in post-Golgi vesicle-mediated transport. Supporting Evidence: PMID:9378760 SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways. file:human/SCAMP2/SCAMP2-deep-research-falcon.md SCAMP family proteins, including SCAMP2, are implicated in the regulation of membrane trafficking steps that govern exocytosis and endocytosis/recycling
GO:0032588 trans-Golgi network membrane	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for TGN membrane localization. This is strongly supported by experimental evidence from PMID:15840657 showing SCAMP2 accumulation at the TGN. Reason: TGN membrane localization is experimentally validated. Lin et al. showed that the majority of NHE7-SCAMP complexes accumulated at the TGN and SCAMP2 is involved in shuttling cargo between recycling vesicles and the TGN. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles.
GO:0055038 recycling endosome membrane	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for recycling endosome membrane localization. This is experimentally validated by studies showing SCAMP2 localizes to recycling endosomes and regulates cargo transit through this compartment. Reason: Recycling endosome localization is well-supported experimentally. Multiple studies demonstrate SCAMP2 in recycling endosomes where it regulates trafficking of NHE5 and NHE7. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles. PMID:19276089 secretory carrier membrane proteins (SCAMPs), a group of tetraspanning integral membrane proteins that reside in multiple secretory and endocytic organelles, bind to NHE5 and co-localize predominantly in the recycling endosomes.
GO:0005794 Golgi apparatus	IEA GO_REF:0000044	ACCEPT	Summary: IEA annotation based on UniProt subcellular location mapping. This is a broader term that encompasses the experimentally validated TGN localization. Reason: The Golgi apparatus annotation is correct but less specific than trans-Golgi network membrane. Given that TGN-specific annotations also exist, this broader annotation remains acceptable as it is not incorrect, just less informative. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN
GO:0015031 protein transport	IEA GO_REF:0000120	ACCEPT	Summary: IEA annotation for protein transport based on InterPro domain mapping. SCAMP2 regulates the trafficking and cell-surface targeting of cargo proteins including Na+/H+ exchangers and the serotonin transporter. Reason: Protein transport is a well-supported function of SCAMP2. Multiple studies demonstrate its role in regulating subcellular distribution and trafficking of membrane transporters such as NHE5, NHE7, and SERT. Supporting Evidence: PMID:15840657 We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN. PMID:19276089 SCAMP2 regulates NHE5 transit through recycling endosomes and promotes its surface targeting in an Arf6-dependent manner.
GO:0016020 membrane	IEA GO_REF:0000002	ACCEPT	Summary: IEA annotation for membrane localization based on InterPro domain. SCAMP2 is an integral membrane protein with four transmembrane helices. Reason: Membrane localization is fundamental to SCAMP2 function. It is a tetraspanning integral membrane protein. This annotation is correct but very broad - more specific membrane annotations (TGN membrane, recycling endosome membrane) also exist. Supporting Evidence: PMID:9378760 The primary structures of three human forms of secretory carrier membrane proteins (SCAMPs) have been deduced
GO:0055038 recycling endosome membrane	IEA GO_REF:0000044	ACCEPT	Summary: Duplicate IEA annotation for recycling endosome membrane based on UniProt subcellular location mapping. Same term as the IBA annotation above. Reason: Duplicate annotation with different evidence code. The recycling endosome membrane localization is experimentally validated and correctly annotated by multiple sources. Supporting Evidence: PMID:19276089 secretory carrier membrane proteins (SCAMPs)...bind to NHE5 and co-localize predominantly in the recycling endosomes.
GO:0005515 protein binding	IPI PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	MODIFY	Summary: IPI annotation for protein binding based on interaction with SLC9A7 (NHE7). The study used yeast two-hybrid, co-immunoprecipitation, and in vitro binding assays to demonstrate direct interaction. Reason: While the interaction with NHE7 is well-documented, 'protein binding' is too generic and uninformative. SCAMP2 functions as a trafficking regulator for NHE7, not just a binding partner. A more specific molecular function term describing its role in binding transmembrane transporters would be more appropriate. Proposed replacements: transmembrane transporter binding Supporting Evidence: PMID:15840657 Direct association of these two proteins was further supported by co-immunolocalization and co-immunoprecipitation analyses using transfected cells, by their co-sedimentation in membrane fractions resolved on sucrose density gradients, and by in vitro protein binding assays.
GO:0005515 protein binding	IPI PMID:32296183 A reference map of the human binary protein interactome.	MARK AS OVER ANNOTATED	Summary: IPI annotation for protein binding based on HuRI (Human Reference Interactome) systematic Y2H screening identifying interaction with SLC41A1. Reason: High-throughput interactome study (HuRI) detecting binary interactions. While technically correct that SCAMP2 binds proteins, this annotation from large-scale Y2H screening adds no specific functional information. The interaction with SLC41A1 has not been validated in the context of SCAMP2's trafficking function. Supporting Evidence: PMID:32296183 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
GO:0005515 protein binding	IPI PMID:32814053 Interactome Mapping Provides a Network of Neurodegenerative ...	MARK AS OVER ANNOTATED	Summary: IPI annotation for protein binding based on neurodegenerative disease interactome mapping study identifying interaction with FLNA (filamin A). Reason: High-throughput interactome screening in the context of neurodegenerative disease. SCAMP2 is not a core neurodegenerative disease protein, and the interaction with FLNA lacks functional validation in the context of SCAMP2's known trafficking roles. The generic 'protein binding' annotation provides no functional insight. Supporting Evidence: PMID:32814053 Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains
GO:0005794 Golgi apparatus	IDA GO_REF:0000052	ACCEPT	Summary: IDA annotation for Golgi apparatus localization based on HPA immunofluorescence curation. Consistent with the experimental literature showing TGN localization. Reason: Golgi apparatus localization is experimentally validated by multiple approaches including immunofluorescence. This is consistent with SCAMP2's role in post-Golgi trafficking. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN
GO:0005515 protein binding	IPI PMID:19276089 Secretory Carrier Membrane Protein 2 Regulates Cell-surface ...	MODIFY	Summary: IPI annotation for protein binding based on interaction with SLC9A5 (NHE5). The study demonstrated direct binding and functional regulation of NHE5 cell-surface targeting by SCAMP2. Reason: The interaction with NHE5 is functionally characterized - SCAMP2 regulates NHE5 cell-surface targeting in an Arf6-dependent manner. Generic 'protein binding' fails to capture this regulatory function. A more specific term would be preferable. Proposed replacements: transmembrane transporter binding Supporting Evidence: PMID:19276089 In vitro protein-protein interaction assays revealed that NHE5 directly binds to the N- and C-terminal cytosolic extensions of SCAMP2. Heterologous expression of SCAMP2 but not SCAMP5 increased cell-surface abundance as well as transporter activity of NHE5 across the plasma membrane.
GO:0070062 extracellular exosome	HDA PMID:20458337 MHC class II-associated proteins in B-cell exosomes and pote...	KEEP AS NON CORE	Summary: HDA annotation for extracellular exosome localization based on mass spectrometry proteomics of B-cell exosomes. SCAMP2 was identified in the exosome proteome but not among the MHC class II-associated proteins of specific interest. Reason: Detection in exosome proteomics is consistent with SCAMP2's role in membrane trafficking and recycling. However, exosome localization is likely a secondary consequence of its primary function in endosomal/TGN trafficking rather than a core function. The study did not specifically focus on SCAMP2 function in exosomes. Supporting Evidence: PMID:20458337 we first analyzed the total proteome of highly purified B cell-derived exosomes using sensitive and accurate mass spectrometry (MS), and identified 539 proteins
GO:0005515 protein binding	IPI PMID:16870614 Subcellular redistribution of the serotonin transporter by s...	MODIFY	Summary: IPI annotation for protein binding based on interaction with SLC6A4 (SERT, serotonin transporter). The study demonstrated direct interaction and functional regulation of SERT subcellular distribution by SCAMP2. Reason: SCAMP2 interaction with SERT is functionally characterized - it causes subcellular redistribution with decreased cell surface SERT and reduced 5-HT uptake. Generic 'protein binding' fails to capture this regulatory relationship. Proposed replacements: transmembrane transporter binding Supporting Evidence: PMID:16870614 GST-pulldown assays confirmed the physical interaction between SCAMP2 and the N-terminal domain of SERT...Co-expression of SERT and SCAMP2 in mammalian cells results in the subcellular redistribution of SERT with a decrease in cell surface SERT and a concomitant reduction in 5-HT uptake activity.
GO:0015031 protein transport	IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	ACCEPT	Summary: IDA annotation for protein transport based on experimental evidence showing SCAMP2 regulates trafficking of NHE7 between recycling vesicles and the TGN. Reason: This is a core function of SCAMP2 supported by experimental evidence demonstrating its role in shuttling NHE7 between compartments and regulating cargo protein distribution. Supporting Evidence: PMID:15840657 We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN.
GO:0016020 membrane	IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	ACCEPT	Summary: IDA annotation for membrane localization based on experimental evidence from fractionation and microscopy studies. Reason: Membrane localization is fundamental to SCAMP2 as a tetraspanning integral membrane protein. The annotation is correct though very broad. Supporting Evidence: PMID:15840657 by their co-sedimentation in membrane fractions resolved on sucrose density gradients
GO:0032588 trans-Golgi network membrane	IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	ACCEPT	Summary: IDA annotation for TGN membrane localization based on direct experimental observation of SCAMP2-NHE7 complex accumulation at the TGN. Reason: TGN membrane localization is a core feature of SCAMP2 function, representing a major site where it regulates cargo trafficking. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles.
GO:0055038 recycling endosome membrane	IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr...	ACCEPT	Summary: IDA annotation for recycling endosome membrane localization based on experimental evidence showing SCAMP2 in recycling vesicles. Reason: Recycling endosome membrane localization is a core feature of SCAMP2 function, representing a compartment where it regulates cargo protein transit. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles. PMID:19276089 SCAMP2 regulates NHE5 transit through recycling endosomes and promotes its surface targeting
GO:0006892 post-Golgi vesicle-mediated transport	TAS PMID:9378760 Three mammalian SCAMPs (secretory carrier membrane proteins)...	ACCEPT	Summary: TAS annotation for post-Golgi vesicle-mediated transport based on the foundational SCAMP characterization paper describing their role in post-Golgi recycling pathways. Reason: This is a core biological process for SCAMP2. The annotation accurately captures its role in shuttling cargo between the TGN and recycling compartments. Supporting Evidence: PMID:9378760 These findings suggest that the SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways.

Core Functions

SCAMP2 functions as a regulator of post-Golgi trafficking, shuttling cargo proteins between the trans-Golgi network and recycling endosomes. This is supported by multiple studies showing SCAMP2 regulates the subcellular distribution and cell-surface targeting of membrane transporters (PMID:9378760, PMID:15840657, PMID:19276089).

Molecular Function:

transmembrane transporter binding

Directly Involved In:

post-Golgi vesicle-mediated transport protein transport

Cellular Locations:

trans-Golgi network membrane recycling endosome membrane

Supporting Evidence:

PMID:15840657
Direct association of these two proteins was further supported by co-immunolocalization and co-immunoprecipitation analyses using transfected cells, by their co-sedimentation in membrane fractions resolved on sucrose density gradients, and by in vitro protein binding assays.
PMID:19276089
In vitro protein-protein interaction assays revealed that NHE5 directly binds to the N- and C-terminal cytosolic extensions of SCAMP2.

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: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:0000052

Gene Ontology annotation based on curation of immunofluorescence data

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.

SCAMP2 directly interacts with NHE7 via its TM2-TM3 cytoplasmic loop

"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"
SCAMP2-NHE7 complexes localize primarily to TGN with 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."
SCAMPs participate in shuttling NHE7 between recycling vesicles and the TGN

"We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN."
Deletion mutant SCAMP2/Delta184-208 causes redistribution of NHE7 to scattered recycling vesicles

"A deletion mutant of SCAMP2 lacking this region (SCAMP2/Delta184-208) bound weakly to NHE7, but caused a significant fraction of NHE7 and wild-type SCAMP2 to redistribute to a pool of scattered recycling vesicles"

PMID:16870614

Subcellular redistribution of the serotonin transporter by secretory carrier membrane protein 2.

SCAMP2 interacts with SERT via the N-terminal domain

"GST-pulldown assays confirmed the physical interaction between SCAMP2 and the N-terminal domain of SERT."
Co-expression causes subcellular redistribution of SERT with decreased cell surface expression

"Co-expression of SERT and SCAMP2 in mammalian cells results in the subcellular redistribution of SERT with a decrease in cell surface SERT"
SCAMP2-SERT interaction causes reduced 5-HT uptake activity

"a decrease in cell surface SERT and a concomitant reduction in 5-HT uptake activity"
Cys201Ala mutation in SCAMP2 E peptide abolishes SERT down-regulation but not binding

"A single amino acid mutation, cysteine-201 to alanine, within the conserved cytoplasmic E peptide of SCAMP2, abolished SCAMP2-mediated down-regulation of SERT, although this mutation had no effect on the physical interaction between SERT and SCAMP2."

PMID:19276089

Secretory Carrier Membrane Protein 2 Regulates Cell-surface Targeting of Brain-enriched Na+/H+ Exchanger NHE5.

NHE5 directly binds to N- and C-terminal cytosolic extensions of SCAMP2

"In vitro protein-protein interaction assays revealed that NHE5 directly binds to the N- and C-terminal cytosolic extensions of SCAMP2."
SCAMP2 (but not SCAMP5) increases NHE5 cell-surface abundance and activity

"Heterologous expression of SCAMP2 but not SCAMP5 increased cell-surface abundance as well as transporter activity of NHE5 across the plasma membrane."
SCAMP2-mediated NHE5 surface targeting is Arf6-dependent but Rab11-independent

"SCAMP2-mediated surface targeting of NHE5 was reversed by dominant-negative Arf6 but not by dominant-negative Rab11."
SCAMP2 and NHE5 co-localize predominantly in recycling endosomes

"secretory carrier membrane proteins (SCAMPs), a group of tetraspanning integral membrane proteins that reside in multiple secretory and endocytic organelles, bind to NHE5 and co-localize predominantly in the recycling endosomes."

PMID:20458337

MHC class II-associated proteins in B-cell exosomes and potential functional implications for exosome biogenesis.

SCAMP2 identified in B-cell exosome proteome (high-throughput mass spectrometry)

"we first analyzed the total proteome of highly purified B cell-derived exosomes using sensitive and accurate mass spectrometry (MS), and identified 539 proteins"

PMID:32296183

A reference map of the human binary protein interactome.

HuRI systematic Y2H screening identified SCAMP2 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"

PMID:32814053

Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains.

SCAMP2-FLNA interaction identified in neurodegenerative disease interactome

"Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains"

PMID:9378760

Three mammalian SCAMPs (secretory carrier membrane proteins) are highly related products of distinct genes having similar subcellular distributions.

Three human SCAMP forms cloned and characterized

"The primary structures of three human forms of secretory carrier membrane proteins (SCAMPs) have been deduced from full-length clones"
SCAMPs show extensive colocalization within cells

"Examination of the codistribution of the three forms within individual cells using double label immunofluorescence indicates extensive colocalization"
SCAMPs function in post-Golgi recycling pathways

"These findings suggest that the SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways."

file:human/SCAMP2/SCAMP2-deep-research-falcon.md

Deep research review of SCAMP2 function

SCAMP2 is a tetraspanning membrane protein involved in post-Golgi trafficking

"SCAMP family proteins, including SCAMP2, are implicated in the regulation of membrane trafficking steps that govern exocytosis and endocytosis/recycling"

Suggested Experiments

Experiment: Identify the full repertoire of SCAMP2 cargo proteins beyond NHE5, NHE7, and SERT using proximity labeling (BioID/TurboID) followed by mass spectrometry. Current knowledge of SCAMP2 cargo is limited to a few transporters. A comprehensive cargo identification would better define its functional scope.

Hypothesis: SCAMP2 regulates trafficking of additional membrane transporters beyond the currently characterized NHE5, NHE7, and SERT.

Experiment: Characterize the structural basis of SCAMP2-cargo interactions using cryo-EM or crystallography of SCAMP2 TM2-TM3 loop with cargo cytoplasmic domains. The TM2-TM3 loop is critical for cargo binding but the molecular details of recognition are unknown.

Hypothesis: The TM2-TM3 cytoplasmic loop of SCAMP2 contains a conserved binding interface that recognizes specific motifs in cargo protein cytoplasmic tails.

Deep Research

Falcon

(SCAMP2-deep-research-falcon.md)

this with annotations you find in gene/protein databases, but these can be outdated or inaccurate. Falcon Edison Scientific Literature 8 citations 2025-12-27T23:36:50.070048

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.

Plan (concise)
- Verified identity: SCAMP2 (UniProt O15127), human Secretory carrier-associated membrane protein 2; SCAMP family member with conserved topology and motifs (completed). (hubbard2000thesecretorycarrier pages 1-2)
- Collected foundational and recent literature; 2023–2024 SCAMP2-specific human evidence in the retrieved corpus is sparse; family-level insights and cross-paralog findings dominate (SCAMPs). (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)
- Synthesized functional annotation emphasizing membrane trafficking, localization, motifs, and mechanistic inferences with explicit limits where human SCAMP2 data are not directly available. (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)

Identity verification and core definitions
- Gene/protein: SCAMP2 (Secretory carrier-associated membrane protein 2); organism: Homo sapiens; UniProt: O15127. SCAMPs are small integral membrane proteins of secretory and endocytic carriers, cycling between the plasma membrane and internal compartments—implicating them in membrane trafficking and its regulation. URL: https://doi.org/10.1091/mbc.11.9.2933; Publication date: Sep 2000. (hubbard2000thesecretorycarrier pages 1-2)
- Family and domains: SCAMP2 belongs to the SCAMP family. Conserved architecture includes: (i) cytosolic N- and C-termini; (ii) a membrane core of four transmembrane helices; (iii) cytosolic N‑terminal low-complexity region with proline-rich sequences (potential SH3/WW-binding); (iv) repeated NPF motifs; and (v) three conserved amphipathic segments whose peptides bind phospholipid membranes and include a helical membrane-proximal element. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000. (hubbard2000thesecretorycarrier pages 1-2)

Primary molecular functions and mechanisms (current understanding)
- Core role: SCAMP family proteins, including SCAMP2, are implicated in the regulation of membrane trafficking steps that govern exocytosis and endocytosis/recycling; SCAMPs are enriched on secretory granules and recycling carriers. Structural topology (cytosolic termini and amphipathic segments) supports direct participation at the membrane–cytosol interface where trafficking machineries operate. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000. (hubbard2000thesecretorycarrier pages 1-2)
- Interaction motifs and potential partners: The NPF repeats and proline-rich regions in SCAMPs predict interactions with endocytic adaptors and SH3-/WW-domain proteins; amphipathic segments bind anionic phospholipids at the cytosolic leaflet. Family-level reports referenced in recent work also discuss lipid interactions (e.g., PIP2) and functional links to the exocytic machinery; however, within the retrieved evidence these are primarily cross-referenced from non-human or other SCAMP paralogs. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000; and family-level synthesis citing SCAMP2 roles in regulated exocytosis. URL: https://doi.org/10.1101/2025.07.03.662988; Jul 2025 (preprint). (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)

Cellular localization
- SCAMP2 localizes to secretory vesicles and endocytic/recycling carriers that cycle between the plasma membrane and internal compartments, consistent with residence on secretory granules and recycling endosomes. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000. (hubbard2000thesecretorycarrier pages 1-2)

Recent developments (prioritizing 2023–2024) and state of the field
- Constraint: Within the documents retrieved and scanned for evidence, direct human SCAMP2-specific primary research from 2023–2024 was not available; most contemporary insights are family-level or relate to other paralogs (e.g., SCAMP3/5) or non-human systems. Therefore, while the consensus functional model for SCAMP2 emphasizes roles in regulated exocytosis and recycling, definitive 2023–2024 human SCAMP2 mechanistic updates could not be substantiated here. Family-level 2025 preprint reaffirms SCAMP roles in trafficking and notes prior SCAMP2 functional perturbations in exocytosis; interpret with caution for human SCAMP2. URL: https://doi.org/10.1101/2025.07.03.662988; Jul 2025 (preprint). (jiang2025secretorycarriermembrane pages 41-44)

Applications, disease links, and real-world implementations
- Given the trafficking role of SCAMPs, SCAMP2 is frequently used as a vesicular trafficking marker or perturbation target in cell biology. However, in the gathered evidence there are no specific 2023–2024 human disease associations or therapeutic applications uniquely attributable to SCAMP2. The overarching application context remains mechanistic cell biology of secretion and endocytosis. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000; and family-level discussion in the 2025 preprint. URL: https://doi.org/10.1101/2025.07.03.662988; Jul 2025 (preprint). (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)

Expert opinions and synthesis
- Authoritative structural/topology review (Hubbard et al., 2000) remains the definitive reference for SCAMP family membrane organization and provides the framework for inferring SCAMP2’s mechanistic role at the cytosolic–membrane interface. This topology underpins hypothesized interactions with SH3/WW domain proteins and lipid-dependent regulation of exo/endocytic steps. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000. (hubbard2000thesecretorycarrier pages 1-2)
- Recent synthesis (2025 preprint) consolidates multiple functional observations across SCAMPs and cites earlier SCAMP2 studies demonstrating roles in late steps of regulated exocytosis and lipid interactions (e.g., PIP2). While it supports the prevailing model, it does not replace the need for updated, SCAMP2-specific human validation. URL: https://doi.org/10.1101/2025.07.03.662988; Jul 2025 (preprint). (jiang2025secretorycarriermembrane pages 41-44)

Relevant statistics and data
- Quantitative or statistical 2023–2024 datasets specific to human SCAMP2 were not present in the retrieved evidence. The established structural/topological features (four-pass membrane topology; cytosolic termini; amphipathic segments) are consistently reported across SCAMPs and provide a robust qualitative basis for function inference. URL: https://doi.org/10.1091/mbc.11.9.2933; Sep 2000. (hubbard2000thesecretorycarrier pages 1-2)

Functional annotation for SCAMP2 (evidence-based summary)
- Primary role: Membrane trafficking regulator associated with secretory and recycling pathways; contributes to regulated exocytosis and endocytosis/recycling dynamics. (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)
- Localization: Secretory granules/vesicles and endocytic/recycling carriers that cycle to/from the plasma membrane. (hubbard2000thesecretorycarrier pages 1-2)
- Structural features enabling function: Four transmembrane helices; cytosolic N-/C-termini; NPF repeats; proline-rich SH3/WW-binding region; conserved amphipathic segments that interact with phospholipid membranes—consistent with scaffolding or regulatory roles at membrane–cytosol interface. (hubbard2000thesecretorycarrier pages 1-2)
- Interaction landscape (inferred/partial): Potential binding to SH3/WW domain proteins and to anionic phospholipids (e.g., PIP2) via amphipathic regions; functional coupling to exocytosis machinery is supported at the family level; direct, up-to-date human SCAMP2 interaction maps were not available in the retrieved corpus. (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)
- Pathways: Secretory pathway (regulated exocytosis), endocytic recycling; exact catalytic activity is not applicable (SCAMP2 is not an enzyme), and it is best described as a membrane trafficking regulator/adaptor. (hubbard2000thesecretorycarrier pages 1-2)

Key facts table
| Aspect | Summary | Citation (URL, publication date) |
|---|---|---|
| Identity (gene/protein) | SCAMP2 — Secretory carrier-associated membrane protein 2; human member of the SCAMP family. | https://doi.org/10.1091/mbc.11.9.2933 (Sep 2000); https://doi.org/10.1101/2025.07.03.662988 (Jul 2025) (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44) |
| Family / domains & topology | Member of SCAMP family with four predicted transmembrane spans, cytosolic N- and C-termini; conserved features include NPF repeats, proline-rich SH3/WW-binding region, and amphipathic membrane-interacting segments. | https://doi.org/10.1091/mbc.11.9.2933 (Sep 2000) (hubbard2000thesecretorycarrier pages 1-2) |
| Primary cellular localization | Enriched on secretory and endocytic/recycling carriers; cycles between the cell surface and internal compartments (consistent with roles in membrane trafficking). | https://doi.org/10.1091/mbc.11.9.2933 (Sep 2000) (hubbard2000thesecretorycarrier pages 1-2) |
| Core molecular / biological functions | Implicated in regulated exocytosis and vesicle trafficking (including granule/dense-core vesicle exocytosis) and in influencing trafficking of cargo membrane proteins. Evidence is primarily family-level and functional perturbation studies. | https://doi.org/10.1091/mbc.11.9.2933 (Sep 2000); https://doi.org/10.1101/2025.07.03.662988 (Jul 2025) (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44) |
| Interaction motifs / partners | Contains NPF and proline-rich motifs that imply interactions with endocytic machinery (SH3/WW-domain proteins); amphipathic segments bind phospholipid membranes; family-level reports note interactions with membrane lipids (e.g., PIP2) and trafficking machinery. | https://doi.org/10.1091/mbc.11.9.2933 (Sep 2000); https://doi.org/10.1101/2025.07.03.662988 (Jul 2025) (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44) |
| Recent developments (2023–2024) & limitations | Direct, human SCAMP2-specific experimental/disease links for 2023–2024 are limited in the gathered evidence; recent work remains largely family-level or in other SCAMP paralogs, indicating active but incomplete characterization and a need for targeted human studies. | https://doi.org/10.1091/mbc.11.9.2933 (Sep 2000); https://doi.org/10.1101/2025.07.03.662988 (Jul 2025) (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44) |

Table: Compact summary of evidence-based facts about human SCAMP2 (structure, localization, functions, motifs, and recent limitations) derived from the provided context IDs; useful for quick reference when preparing a detailed functional annotation.

Limitations and next steps
- The gene symbol and organism context are unambiguous here (SCAMP2, human; UniProt O15127). However, 2023–2024 primary literature specifically interrogating human SCAMP2 was not captured in the gathered evidence. The present report therefore integrates authoritative foundational evidence and recent family-level synthesis while highlighting the need for targeted, SCAMP2-specific studies (e.g., interactome mapping, loss-of-function phenotyping, live-cell trafficking assays) to refine molecular partners and disease relevance. (hubbard2000thesecretorycarrier pages 1-2, jiang2025secretorycarriermembrane pages 41-44)

References

(hubbard2000thesecretorycarrier pages 1-2): Charles H. Hubbard, David R. Singleton, Michelle Rauch, Sajith Jayasinghe, D. Cafiso, and David Castle. The secretory carrier membrane protein family: structure and membrane topology. Molecular biology of the cell, 11 9:2933-47, Sep 2000. URL: https://doi.org/10.1091/mbc.11.9.2933, doi:10.1091/mbc.11.9.2933. This article has 69 citations and is from a domain leading peer-reviewed journal.
(jiang2025secretorycarriermembrane pages 41-44): Qihang Jiang, Michaël Vandorpe, Ana Romina Fox, Mattias Vermeersch, Evelien Mylle, Alvaro Furones Cuadrado, Julia Kraus, Hongyan Liu, Dominique Eeckhout, Catherine Navarre, Adeline Courtoy, Daniela Kocourková, Tereza Korec Podmanická, Thomas B. Jacobs, Jonathan Michael Dragwidge, Ive De Smet, Roman Pleskot, François Chaumont, and Daniël Van Damme. Secretory carrier membrane proteins assist with aquaporin trafficking in arabidopsis. bioRxiv, Jul 2025. URL: https://doi.org/10.1101/2025.07.03.662988, doi:10.1101/2025.07.03.662988. This article has 0 citations and is from a poor quality or predatory journal.

Citations

hubbard2000thesecretorycarrier pages 1-2
jiang2025secretorycarriermembrane pages 41-44
https://doi.org/10.1091/mbc.11.9.2933;
https://doi.org/10.1101/2025.07.03.662988;
https://doi.org/10.1091/mbc.11.9.2933
https://doi.org/10.1101/2025.07.03.662988
https://doi.org/10.1091/mbc.11.9.2933,
https://doi.org/10.1101/2025.07.03.662988,

📄 View Raw YAML

id: O15127
gene_symbol: SCAMP2
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  Secretory carrier-associated membrane protein 2 (SCAMP2) is a tetraspanning integral
  membrane protein belonging to the SCAMP family. It functions as a regulator of membrane
  trafficking in post-Golgi recycling pathways, shuttling between the trans-Golgi network
  (TGN), recycling endosomes, and the plasma membrane. SCAMP2 directly interacts with and
  regulates the subcellular distribution and cell-surface targeting of membrane transport
  proteins including Na+/H+ exchangers (NHE5, NHE7) and the serotonin transporter (SERT).
  The protein contains cytosolic N- and C-termini with NPF repeats and proline-rich
  sequences that may mediate interactions with SH3/WW-domain proteins, and a conserved
  cytoplasmic loop between TM2-TM3 that is critical for cargo binding. SCAMP2 promotes
  surface targeting of NHE5 through an Arf6-dependent mechanism and participates in the
  redistribution of cargo proteins between recycling vesicles and the TGN.
existing_annotations:
- term:
    id: GO:0006887
    label: exocytosis
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      IBA annotation based on phylogenetic inference. SCAMP family proteins are implicated
      in regulated exocytosis based on their localization to secretory vesicles and
      functional studies showing roles in late steps of exocytosis (PMID:9378760,
      Hubbard et al. 2000).
    action: ACCEPT
    reason: >-
      The annotation to exocytosis is well-supported by the known role of SCAMP proteins
      in secretory and endocytic membrane trafficking. SCAMPs are enriched on secretory
      granules and recycling carriers, and family-level studies support roles in regulated
      exocytosis. The IBA annotation is consistent with SCAMP2's documented functions in
      post-Golgi vesicle-mediated transport.
    supported_by:
      - reference_id: PMID:9378760
        supporting_text: "SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways."
      - reference_id: file:human/SCAMP2/SCAMP2-deep-research-falcon.md
        supporting_text: "SCAMP family proteins, including SCAMP2, are implicated in the regulation of membrane trafficking steps that govern exocytosis and endocytosis/recycling"
- term:
    id: GO:0032588
    label: trans-Golgi network membrane
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      IBA annotation for TGN membrane localization. This is strongly supported by
      experimental evidence from PMID:15840657 showing SCAMP2 accumulation at the TGN.
    action: ACCEPT
    reason: >-
      TGN membrane localization is experimentally validated. Lin et al. showed that the
      majority of NHE7-SCAMP complexes accumulated at the TGN and SCAMP2 is involved in
      shuttling cargo between recycling vesicles and the TGN.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles."
- term:
    id: GO:0055038
    label: recycling endosome membrane
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      IBA annotation for recycling endosome membrane localization. This is experimentally
      validated by studies showing SCAMP2 localizes to recycling endosomes and regulates
      cargo transit through this compartment.
    action: ACCEPT
    reason: >-
      Recycling endosome localization is well-supported experimentally. Multiple studies
      demonstrate SCAMP2 in recycling endosomes where it regulates trafficking of NHE5
      and NHE7.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles."
      - reference_id: PMID:19276089
        supporting_text: "secretory carrier membrane proteins (SCAMPs), a group of tetraspanning integral membrane proteins that reside in multiple secretory and endocytic organelles, bind to NHE5 and co-localize predominantly in the recycling endosomes."
- term:
    id: GO:0005794
    label: Golgi apparatus
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: >-
      IEA annotation based on UniProt subcellular location mapping. This is a broader
      term that encompasses the experimentally validated TGN localization.
    action: ACCEPT
    reason: >-
      The Golgi apparatus annotation is correct but less specific than trans-Golgi network
      membrane. Given that TGN-specific annotations also exist, this broader annotation
      remains acceptable as it is not incorrect, just less informative.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at the TGN"
- term:
    id: GO:0015031
    label: protein transport
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: >-
      IEA annotation for protein transport based on InterPro domain mapping. SCAMP2
      regulates the trafficking and cell-surface targeting of cargo proteins including
      Na+/H+ exchangers and the serotonin transporter.
    action: ACCEPT
    reason: >-
      Protein transport is a well-supported function of SCAMP2. Multiple studies
      demonstrate its role in regulating subcellular distribution and trafficking of
      membrane transporters such as NHE5, NHE7, and SERT.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN."
      - reference_id: PMID:19276089
        supporting_text: "SCAMP2 regulates NHE5 transit through recycling endosomes and promotes its surface targeting in an Arf6-dependent manner."
- term:
    id: GO:0016020
    label: membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  review:
    summary: >-
      IEA annotation for membrane localization based on InterPro domain. SCAMP2 is an
      integral membrane protein with four transmembrane helices.
    action: ACCEPT
    reason: >-
      Membrane localization is fundamental to SCAMP2 function. It is a tetraspanning
      integral membrane protein. This annotation is correct but very broad - more specific
      membrane annotations (TGN membrane, recycling endosome membrane) also exist.
    supported_by:
      - reference_id: PMID:9378760
        supporting_text: "The primary structures of three human forms of secretory carrier membrane proteins (SCAMPs) have been deduced"
- term:
    id: GO:0055038
    label: recycling endosome membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: >-
      Duplicate IEA annotation for recycling endosome membrane based on UniProt subcellular
      location mapping. Same term as the IBA annotation above.
    action: ACCEPT
    reason: >-
      Duplicate annotation with different evidence code. The recycling endosome membrane
      localization is experimentally validated and correctly annotated by multiple sources.
    supported_by:
      - reference_id: PMID:19276089
        supporting_text: "secretory carrier membrane proteins (SCAMPs)...bind to NHE5 and co-localize predominantly in the recycling endosomes."
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:15840657
  review:
    summary: >-
      IPI annotation for protein binding based on interaction with SLC9A7 (NHE7). The
      study used yeast two-hybrid, co-immunoprecipitation, and in vitro binding assays
      to demonstrate direct interaction.
    action: MODIFY
    reason: >-
      While the interaction with NHE7 is well-documented, 'protein binding' is too generic
      and uninformative. SCAMP2 functions as a trafficking regulator for NHE7, not just
      a binding partner. A more specific molecular function term describing its role in
      binding transmembrane transporters would be more appropriate.
    proposed_replacement_terms:
      - id: GO:0044325
        label: transmembrane transporter binding
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "Direct association of these two proteins was further supported by co-immunolocalization and co-immunoprecipitation analyses using transfected cells, by their co-sedimentation in membrane fractions resolved on sucrose density gradients, and by in vitro protein binding assays."
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:32296183
  review:
    summary: >-
      IPI annotation for protein binding based on HuRI (Human Reference Interactome)
      systematic Y2H screening identifying interaction with SLC41A1.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      High-throughput interactome study (HuRI) detecting binary interactions. While
      technically correct that SCAMP2 binds proteins, this annotation from large-scale
      Y2H screening adds no specific functional information. The interaction with SLC41A1
      has not been validated in the context of SCAMP2's trafficking function.
    supported_by:
      - reference_id: PMID:32296183
        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"
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:32814053
  review:
    summary: >-
      IPI annotation for protein binding based on neurodegenerative disease interactome
      mapping study identifying interaction with FLNA (filamin A).
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      High-throughput interactome screening in the context of neurodegenerative disease.
      SCAMP2 is not a core neurodegenerative disease protein, and the interaction with
      FLNA lacks functional validation in the context of SCAMP2's known trafficking roles.
      The generic 'protein binding' annotation provides no functional insight.
    supported_by:
      - reference_id: PMID:32814053
        supporting_text: "Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains"
- term:
    id: GO:0005794
    label: Golgi apparatus
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  review:
    summary: >-
      IDA annotation for Golgi apparatus localization based on HPA immunofluorescence
      curation. Consistent with the experimental literature showing TGN localization.
    action: ACCEPT
    reason: >-
      Golgi apparatus localization is experimentally validated by multiple approaches
      including immunofluorescence. This is consistent with SCAMP2's role in post-Golgi
      trafficking.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at the TGN"
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:19276089
  review:
    summary: >-
      IPI annotation for protein binding based on interaction with SLC9A5 (NHE5). The
      study demonstrated direct binding and functional regulation of NHE5 cell-surface
      targeting by SCAMP2.
    action: MODIFY
    reason: >-
      The interaction with NHE5 is functionally characterized - SCAMP2 regulates NHE5
      cell-surface targeting in an Arf6-dependent manner. Generic 'protein binding' fails
      to capture this regulatory function. A more specific term would be preferable.
    proposed_replacement_terms:
      - id: GO:0044325
        label: transmembrane transporter binding
    supported_by:
      - reference_id: PMID:19276089
        supporting_text: "In vitro protein-protein interaction assays revealed that NHE5 directly binds to the N- and C-terminal cytosolic extensions of SCAMP2. Heterologous expression of SCAMP2 but not SCAMP5 increased cell-surface abundance as well as transporter activity of NHE5 across the plasma membrane."
- term:
    id: GO:0070062
    label: extracellular exosome
  evidence_type: HDA
  original_reference_id: PMID:20458337
  review:
    summary: >-
      HDA annotation for extracellular exosome localization based on mass spectrometry
      proteomics of B-cell exosomes. SCAMP2 was identified in the exosome proteome but
      not among the MHC class II-associated proteins of specific interest.
    action: KEEP_AS_NON_CORE
    reason: >-
      Detection in exosome proteomics is consistent with SCAMP2's role in membrane
      trafficking and recycling. However, exosome localization is likely a secondary
      consequence of its primary function in endosomal/TGN trafficking rather than a
      core function. The study did not specifically focus on SCAMP2 function in exosomes.
    supported_by:
      - reference_id: PMID:20458337
        supporting_text: "we first analyzed the total proteome of highly purified B cell-derived exosomes using sensitive and accurate mass spectrometry (MS), and identified 539 proteins"
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:16870614
  review:
    summary: >-
      IPI annotation for protein binding based on interaction with SLC6A4 (SERT, serotonin
      transporter). The study demonstrated direct interaction and functional regulation
      of SERT subcellular distribution by SCAMP2.
    action: MODIFY
    reason: >-
      SCAMP2 interaction with SERT is functionally characterized - it causes subcellular
      redistribution with decreased cell surface SERT and reduced 5-HT uptake. Generic
      'protein binding' fails to capture this regulatory relationship.
    proposed_replacement_terms:
      - id: GO:0044325
        label: transmembrane transporter binding
    supported_by:
      - reference_id: PMID:16870614
        supporting_text: "GST-pulldown assays confirmed the physical interaction between SCAMP2 and the N-terminal domain of SERT...Co-expression of SERT and SCAMP2 in mammalian cells results in the subcellular redistribution of SERT with a decrease in cell surface SERT and a concomitant reduction in 5-HT uptake activity."
- term:
    id: GO:0015031
    label: protein transport
  evidence_type: IDA
  original_reference_id: PMID:15840657
  review:
    summary: >-
      IDA annotation for protein transport based on experimental evidence showing SCAMP2
      regulates trafficking of NHE7 between recycling vesicles and the TGN.
    action: ACCEPT
    reason: >-
      This is a core function of SCAMP2 supported by experimental evidence demonstrating
      its role in shuttling NHE7 between compartments and regulating cargo protein
      distribution.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN."
- term:
    id: GO:0016020
    label: membrane
  evidence_type: IDA
  original_reference_id: PMID:15840657
  review:
    summary: >-
      IDA annotation for membrane localization based on experimental evidence from
      fractionation and microscopy studies.
    action: ACCEPT
    reason: >-
      Membrane localization is fundamental to SCAMP2 as a tetraspanning integral membrane
      protein. The annotation is correct though very broad.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "by their co-sedimentation in membrane fractions resolved on sucrose density gradients"
- term:
    id: GO:0032588
    label: trans-Golgi network membrane
  evidence_type: IDA
  original_reference_id: PMID:15840657
  review:
    summary: >-
      IDA annotation for TGN membrane localization based on direct experimental
      observation of SCAMP2-NHE7 complex accumulation at the TGN.
    action: ACCEPT
    reason: >-
      TGN membrane localization is a core feature of SCAMP2 function, representing a
      major site where it regulates cargo trafficking.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles."
- term:
    id: GO:0055038
    label: recycling endosome membrane
  evidence_type: IDA
  original_reference_id: PMID:15840657
  review:
    summary: >-
      IDA annotation for recycling endosome membrane localization based on experimental
      evidence showing SCAMP2 in recycling vesicles.
    action: ACCEPT
    reason: >-
      Recycling endosome membrane localization is a core feature of SCAMP2 function,
      representing a compartment where it regulates cargo protein transit.
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "The majority of the NHE7-SCAMP complexes accumulated at the TGN, but a minor fraction also resided in recycling vesicles."
      - reference_id: PMID:19276089
        supporting_text: "SCAMP2 regulates NHE5 transit through recycling endosomes and promotes its surface targeting"
- term:
    id: GO:0006892
    label: post-Golgi vesicle-mediated transport
  evidence_type: TAS
  original_reference_id: PMID:9378760
  review:
    summary: >-
      TAS annotation for post-Golgi vesicle-mediated transport based on the foundational
      SCAMP characterization paper describing their role in post-Golgi recycling pathways.
    action: ACCEPT
    reason: >-
      This is a core biological process for SCAMP2. The annotation accurately captures
      its role in shuttling cargo between the TGN and recycling compartments.
    supported_by:
      - reference_id: PMID:9378760
        supporting_text: "These findings suggest that the SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways."
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: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:0000052
  title: Gene Ontology annotation based on curation of immunofluorescence data
  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: SCAMP2 directly interacts with NHE7 via its TM2-TM3 cytoplasmic loop
      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"
    - statement: SCAMP2-NHE7 complexes localize primarily to TGN with 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: SCAMPs participate in shuttling NHE7 between recycling vesicles and the TGN
      supporting_text: "We propose a model wherein SCAMPs participate in the shuttling of NHE7 between recycling vesicles and the TGN."
    - statement: Deletion mutant SCAMP2/Delta184-208 causes redistribution of NHE7 to scattered recycling vesicles
      supporting_text: "A deletion mutant of SCAMP2 lacking this region (SCAMP2/Delta184-208) bound weakly to NHE7, but caused a significant fraction of NHE7 and wild-type SCAMP2 to redistribute to a pool of scattered recycling vesicles"
- id: PMID:16870614
  title: Subcellular redistribution of the serotonin transporter by secretory carrier
    membrane protein 2.
  findings:
    - statement: SCAMP2 interacts with SERT via the N-terminal domain
      supporting_text: "GST-pulldown assays confirmed the physical interaction between SCAMP2 and the N-terminal domain of SERT."
    - statement: Co-expression causes subcellular redistribution of SERT with decreased cell surface expression
      supporting_text: "Co-expression of SERT and SCAMP2 in mammalian cells results in the subcellular redistribution of SERT with a decrease in cell surface SERT"
    - statement: SCAMP2-SERT interaction causes reduced 5-HT uptake activity
      supporting_text: "a decrease in cell surface SERT and a concomitant reduction in 5-HT uptake activity"
    - statement: Cys201Ala mutation in SCAMP2 E peptide abolishes SERT down-regulation but not binding
      supporting_text: "A single amino acid mutation, cysteine-201 to alanine, within the conserved cytoplasmic E peptide of SCAMP2, abolished SCAMP2-mediated down-regulation of SERT, although this mutation had no effect on the physical interaction between SERT and SCAMP2."
- id: PMID:19276089
  title: Secretory Carrier Membrane Protein 2 Regulates Cell-surface Targeting of
    Brain-enriched Na+/H+ Exchanger NHE5.
  findings:
    - statement: NHE5 directly binds to N- and C-terminal cytosolic extensions of SCAMP2
      supporting_text: "In vitro protein-protein interaction assays revealed that NHE5 directly binds to the N- and C-terminal cytosolic extensions of SCAMP2."
    - statement: SCAMP2 (but not SCAMP5) increases NHE5 cell-surface abundance and activity
      supporting_text: "Heterologous expression of SCAMP2 but not SCAMP5 increased cell-surface abundance as well as transporter activity of NHE5 across the plasma membrane."
    - statement: SCAMP2-mediated NHE5 surface targeting is Arf6-dependent but Rab11-independent
      supporting_text: "SCAMP2-mediated surface targeting of NHE5 was reversed by dominant-negative Arf6 but not by dominant-negative Rab11."
    - statement: SCAMP2 and NHE5 co-localize predominantly in recycling endosomes
      supporting_text: "secretory carrier membrane proteins (SCAMPs), a group of tetraspanning integral membrane proteins that reside in multiple secretory and endocytic organelles, bind to NHE5 and co-localize predominantly in the recycling endosomes."
- id: PMID:20458337
  title: MHC class II-associated proteins in B-cell exosomes and potential functional
    implications for exosome biogenesis.
  findings:
    - statement: SCAMP2 identified in B-cell exosome proteome (high-throughput mass spectrometry)
      supporting_text: "we first analyzed the total proteome of highly purified B cell-derived exosomes using sensitive and accurate mass spectrometry (MS), and identified 539 proteins"
- id: PMID:32296183
  title: A reference map of the human binary protein interactome.
  findings:
    - statement: HuRI systematic Y2H screening identified SCAMP2 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: PMID:32814053
  title: Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins
    and Uncovers Widespread Protein Aggregation in Affected Brains.
  findings:
    - statement: SCAMP2-FLNA interaction identified in neurodegenerative disease interactome
      supporting_text: "Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains"
- id: PMID:9378760
  title: Three mammalian SCAMPs (secretory carrier membrane proteins) are highly related
    products of distinct genes having similar subcellular distributions.
  findings:
    - statement: Three human SCAMP forms cloned and characterized
      supporting_text: "The primary structures of three human forms of secretory carrier membrane proteins (SCAMPs) have been deduced from full-length clones"
    - statement: SCAMPs show extensive colocalization within cells
      supporting_text: "Examination of the codistribution of the three forms within individual cells using double label immunofluorescence indicates extensive colocalization"
    - statement: SCAMPs function in post-Golgi recycling pathways
      supporting_text: "These findings suggest that the SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways."
- id: file:human/SCAMP2/SCAMP2-deep-research-falcon.md
  title: Deep research review of SCAMP2 function
  findings:
    - statement: SCAMP2 is a tetraspanning membrane protein involved in post-Golgi trafficking
      supporting_text: "SCAMP family proteins, including SCAMP2, are implicated in the regulation of membrane trafficking steps that govern exocytosis and endocytosis/recycling"
core_functions:
  - description: >-
      SCAMP2 functions as a regulator of post-Golgi trafficking, shuttling cargo proteins
      between the trans-Golgi network and recycling endosomes. This is supported by
      multiple studies showing SCAMP2 regulates the subcellular distribution and
      cell-surface targeting of membrane transporters (PMID:9378760, PMID:15840657,
      PMID:19276089).
    molecular_function:
      id: GO:0044325
      label: transmembrane transporter binding
    directly_involved_in:
      - id: GO:0006892
        label: post-Golgi vesicle-mediated transport
      - id: GO:0015031
        label: protein transport
    locations:
      - id: GO:0032588
        label: trans-Golgi network membrane
      - id: GO:0055038
        label: recycling endosome membrane
    supported_by:
      - reference_id: PMID:15840657
        supporting_text: "Direct association of these two proteins was further supported by co-immunolocalization and co-immunoprecipitation analyses using transfected cells, by their co-sedimentation in membrane fractions resolved on sucrose density gradients, and by in vitro protein binding assays."
      - reference_id: PMID:19276089
        supporting_text: "In vitro protein-protein interaction assays revealed that NHE5 directly binds to the N- and C-terminal cytosolic extensions of SCAMP2."
proposed_new_terms: []
suggested_questions:
  - question: >-
      Does SCAMP2 have a specific molecular function term that captures its role as
      a trafficking regulator for membrane transporters, beyond generic 'protein binding'?
      Multiple studies show SCAMP2 physically interacts with and functionally regulates
      the subcellular distribution of cargo proteins, but current MF annotations are
      limited to the uninformative 'protein binding' term.
suggested_experiments:
  - description: >-
      Identify the full repertoire of SCAMP2 cargo proteins beyond NHE5, NHE7, and SERT
      using proximity labeling (BioID/TurboID) followed by mass spectrometry.
      Current knowledge of SCAMP2 cargo is limited to a few transporters. A comprehensive
      cargo identification would better define its functional scope.
    hypothesis: >-
      SCAMP2 regulates trafficking of additional membrane transporters beyond the currently
      characterized NHE5, NHE7, and SERT.
  - description: >-
      Characterize the structural basis of SCAMP2-cargo interactions using cryo-EM or
      crystallography of SCAMP2 TM2-TM3 loop with cargo cytoplasmic domains.
      The TM2-TM3 loop is critical for cargo binding but the molecular details of
      recognition are unknown.
    hypothesis: >-
      The TM2-TM3 cytoplasmic loop of SCAMP2 contains a conserved binding interface
      that recognizes specific motifs in cargo protein cytoplasmic tails.

Gene Description

Existing Annotations Review

Core Functions

References

Suggested Questions for Experts

Suggested Experiments

Deep Research

Falcon

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