SCAMP1 (Secretory carrier-associated membrane protein 1) is a tetraspanning integral membrane protein that functions as a trafficking factor in post-Golgi recycling pathways. The protein contains four transmembrane domains with both N- and C-termini exposed to the cytoplasm, N-terminal NPF motifs that bind EH-domain proteins (such as Eps15 and intersectin), and a conserved amphipathic E peptide between TM2-TM3 that interacts with membranes. SCAMP1 localizes primarily to the trans-Golgi network and recycling endosomes, where it participates in shuttling cargo proteins (such as the Na+/H+ exchanger NHE7) between these compartments and the plasma membrane. SCAMP1 is involved in coupling exocytosis with compensatory endocytosis and may contribute to fusion pore stabilization during regulated secretion. The protein interacts with multiple trafficking-associated proteins and has been implicated in neutrophil degranulation pathways.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0006887 exocytosis | IBA GO_REF:0000033 | ACCEPT | Summary: IBA annotation for exocytosis is well-supported by the role of SCAMPs in regulated secretion pathways. Studies have shown that SCAMP proteins, including SCAMP1, participate in dense-core granule release and fusion pore dynamics. SCAMP1 localizes to secretory granules and participates in post-Golgi vesicle-mediated transport, contributing to exocytotic processes. Deep research (SCAMP1-deep-research-falcon.md) cites family-level evidence for SCAMP involvement in exocytosis and fusion pore regulation. Reason: The IBA annotation is consistent with experimental evidence showing SCAMP family involvement in exocytosis. The phylogenetic inference is supported by the conserved role of SCAMPs in vesicular transport and the conservation of the E peptide domain implicated in fusion pore dynamics. This represents a core function of the SCAMP family. Supporting Evidence: GO_REF:0000033 Phylogenetic annotation from IBA pipeline based on PANTHER family file:human/SCAMP1/SCAMP1-deep-research-falcon.md Overexpression of the SCAMP E peptide inhibits dense-core granule release, and SCAMP1 knockout studies indicate altered fusion dynamics with increased transient fusion events |
| GO:0032588 trans-Golgi network membrane | IBA GO_REF:0000033 | ACCEPT | Summary: IBA annotation for trans-Golgi network membrane is strongly supported by direct experimental evidence. PMID:15840657 demonstrated that SCAMP1 localizes to the trans-Golgi network where it interacts with the Na+/H+ exchanger NHE7. Reason: The IBA annotation is supported by IDA evidence from PMID:15840657 showing SCAMP1 co-immunolocalization with TGN markers and co-sedimentation with TGN fractions. This represents a primary localization site for SCAMP1. Supporting Evidence: PMID:15840657 The majority of the NHE7-SCAMP complexes accumulated at the TGN |
| GO:0055038 recycling endosome membrane | IBA GO_REF:0000033 | ACCEPT | Summary: IBA annotation for recycling endosome membrane is well-supported. PMID:15840657 showed that SCAMP1 localizes to recycling vesicles. Reason: This annotation is supported by IDA evidence showing SCAMP1 in recycling vesicles. The recycling endosome is a key site for SCAMP1 function in cargo shuttling between TGN and plasma membrane. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles |
| GO:0005794 Golgi apparatus | IEA GO_REF:0000044 | ACCEPT | Summary: IEA annotation for Golgi apparatus is correct but less specific than the IDA annotation for trans-Golgi network. This is a parent term that encompasses the more specific TGN localization. Reason: The annotation is accurate as the TGN is part of the Golgi apparatus, and this IEA annotation serves as an appropriate broader annotation consistent with the experimental data. 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 is supported by the IDA evidence from PMID:15840657 showing that SCAMP1 regulates trafficking of NHE7 between recycling vesicles and the TGN. Reason: SCAMP1 participates in protein transport by regulating shuttling of cargo proteins like NHE7 between organellar compartments. This is a core function of the protein. 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 | IEA GO_REF:0000002 | ACCEPT | Summary: IEA annotation for membrane is accurate but very general. SCAMP1 is an integral membrane protein with four transmembrane domains. Reason: The annotation is correct; SCAMP1 is a multi-pass membrane protein. More specific membrane localizations (TGN membrane, recycling endosome membrane) are also annotated. Supporting Evidence: UniProt:O15126 Multi-pass membrane protein |
| GO:0055038 recycling endosome membrane | IEA GO_REF:0000044 | ACCEPT | Summary: Duplicate IEA annotation for recycling endosome membrane, paralleling the IBA annotation. This is consistent with experimental evidence. Reason: The annotation is supported by experimental evidence from PMID:15840657 showing SCAMP1 in recycling vesicles. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles |
| GO:0005515 protein binding | IPI PMID:25416956 A proteome-scale map of the human interactome network. | MARK AS OVER ANNOTATED | Summary: High-throughput interactome study (HI-II-14) identifying protein-protein interactions. The term 'protein binding' is uninformative for a protein whose function depends on protein-protein interactions. Reason: While SCAMP1 clearly binds proteins as part of its trafficking function, the generic 'protein binding' term does not capture the specific nature of these interactions. More informative terms describing the functional context of interactions would be preferred. Supporting Evidence: PMID:25416956 Here, we describe a systematic map of ?14,000 high-quality human binary protein-protein interactions |
| GO:0005515 protein binding | IPI PMID:28514442 Architecture of the human interactome defines protein commun... | MARK AS OVER ANNOTATED | Summary: Another high-throughput interactome study identifying SCAMP1 interactions. Reason: Same rationale as above; 'protein binding' is too generic for meaningful annotation. Supporting Evidence: PMID:28514442 BioPlex 2.0 contains more than 29,000 previously unknown co-associations and provides functional insights into hundreds of poorly characterized proteins |
| GO:0005515 protein binding | IPI PMID:32296183 A reference map of the human binary protein interactome. | MARK AS OVER ANNOTATED | Summary: Reference map of human binary protein interactome detecting SCAMP1 interactions. Reason: Same rationale; 'protein binding' lacks specificity about the functional context. Supporting Evidence: PMID:32296183 we refer to HI-III-20 as a reference map of the human binary protein interactome |
| GO:0005515 protein binding | IPI PMID:32814053 Interactome Mapping Provides a Network of Neurodegenerative ... | MARK AS OVER ANNOTATED | Summary: Interactome mapping in neurodegenerative disease context. Reason: 'Protein binding' is uninformative; SCAMP1 interactions should be annotated with more specific functional terms where evidence supports. Supporting Evidence: PMID:32814053 an interactome map that focuses on neurodegenerative disease (ND), connects ∼5,000 human proteins via ∼30,000 candidate interactions |
| GO:0005515 protein binding | IPI PMID:33961781 Dual proteome-scale networks reveal cell-specific remodeling... | MARK AS OVER ANNOTATED | Summary: Cell-specific interactome remodeling study. Reason: Same rationale regarding uninformative nature of 'protein binding'. Supporting Evidence: PMID:33961781 we have created two proteome-scale, cell-line-specific interaction networks |
| GO:0005515 protein binding | IPI PMID:35156780 CFTR interactome mapping using the mammalian membrane two-hy... | MARK AS OVER ANNOTATED | Summary: CFTR interactome study identifying SCAMP1-CFTR interaction. Reason: While the SCAMP1-CFTR interaction is interesting given both are involved in membrane trafficking, 'protein binding' is too generic to capture this relationship meaningfully. Supporting Evidence: PMID:35156780 CFTR interactome mapping using the mammalian membrane two-hybrid high-throughput screening system |
| GO:0005515 protein binding | IPI PMID:36012204 Differential CFTR-Interactome Proximity Labeling Procedures ... | MARK AS OVER ANNOTATED | Summary: CFTR proximity labeling study identifying enrichment of SLC transporters. Reason: 'Protein binding' is uninformative; the CFTR-SCAMP1 proximity relationship may be biologically relevant for CFTR trafficking but requires more specific annotation. Supporting Evidence: PMID:36012204 The two proximity labeling approaches identified both known and additional CFTR protein partners, including multiple SLC transporters |
| GO:0006897 endocytosis | IEA GO_REF:0000107 | ACCEPT | Summary: IEA annotation for endocytosis based on ortholog inference. SCAMP1 is involved in recycling pathways that are coupled to endocytosis, particularly compensatory endocytosis after exocytosis. Reason: SCAMP1 participates in recycling pathways that intersect with endocytic machinery. The NPF motifs recruit EH-domain proteins like Eps15 and intersectin, which are endocytic scaffolds. While SCAMP1 may not directly drive initial clathrin-coated vesicle formation, it functions in endocytic recycling. Supporting Evidence: file:human/SCAMP1/SCAMP1-deep-research-falcon.md SCAMP1/2 localize to recycling endosomes, where NPF motifs recruit EH-domain proteins (Eps15/intersectin) |
| GO:0019904 protein domain specific binding | IEA GO_REF:0000107 | ACCEPT | Summary: IEA annotation for protein domain specific binding. SCAMP1 contains NPF motifs that specifically bind EH domains in proteins like Eps15 and intersectin. Reason: The NPF-EH domain interaction is well-established for SCAMP proteins, representing a specific domain-based interaction mechanism for coupling to endocytic machinery. Supporting Evidence: file:human/SCAMP1/SCAMP1-deep-research-falcon.md SCAMP1 contains multiple NPF motifs in its N-terminus that bind EH-domain proteins (Eps15, intersectin) |
| GO:0030136 clathrin-coated vesicle | IEA GO_REF:0000107 | ACCEPT | Summary: IEA annotation for clathrin-coated vesicle localization based on ortholog inference. Reason: SCAMP1 interacts with EH-domain proteins that are components of clathrin-associated endocytic machinery, supporting transient localization to clathrin-coated vesicles. Supporting Evidence: file:human/SCAMP1/SCAMP1-deep-research-falcon.md NPF motifs recruit EH-domain proteins (Eps15/intersectin), linking SCAMP1 to clathrin-associated endocytic scaffolds |
| GO:0030659 cytoplasmic vesicle membrane | IEA GO_REF:0000107 | ACCEPT | Summary: IEA annotation for cytoplasmic vesicle membrane is accurate but less specific than annotations for recycling endosome membrane or TGN membrane. Reason: SCAMP1 localizes to various cytoplasmic vesicle membranes including recycling endosomes and post-Golgi vesicles. This is a valid parent term. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles |
| GO:0030672 synaptic vesicle membrane | IEA GO_REF:0000120 | KEEP AS NON CORE | Summary: IEA annotation for synaptic vesicle membrane based on ortholog inference. SCAMP1 is expressed in brain and has been found in synaptic vesicle preparations. Reason: While SCAMP1 is highly expressed in brain and localizes to synaptic vesicles in neurons, this is not its primary or core localization. SCAMP1 is widely expressed and its core function is in general post-Golgi recycling pathways. Supporting Evidence: UniProt:O15126 Widely expressed, with highest expression in brain |
| GO:0042589 zymogen granule membrane | IEA GO_REF:0000107 | KEEP AS NON CORE | Summary: IEA annotation for zymogen granule membrane based on ortholog inference. Zymogen granules are specialized secretory granules in pancreatic acinar cells. Reason: SCAMPs have been detected in secretory granules including zymogen granules, consistent with their role in regulated secretion. However, this represents tissue-specific localization rather than a core function. Supporting Evidence: file:human/SCAMP1/SCAMP1-deep-research-falcon.md SCAMPs concentrate in endomembrane systems that recycle between plasma membrane and internal compartments (early/recycling endosomes, trans-Golgi network, secretory granules) |
| GO:0045202 synapse | IEA GO_REF:0000107 | KEEP AS NON CORE | Summary: IEA annotation for synapse localization based on ortholog inference. Reason: SCAMP1 localizes to synapses in neurons due to its presence on synaptic vesicles and recycling compartments. This is tissue-specific and not a core localization. Supporting Evidence: UniProt:O15126 Widely expressed, with highest expression in brain |
| GO:0005886 plasma membrane | TAS Reactome:R-HSA-6799350 | ACCEPT | Summary: TAS annotation for plasma membrane from Reactome neutrophil degranulation pathway. SCAMP1 cycles between intracellular compartments and the plasma membrane. Reason: SCAMP1 functions in recycling pathways that deliver cargo to the plasma membrane, and a fraction of SCAMP1 transiently localizes to the surface during this cycling. Supporting Evidence: Reactome:R-HSA-6799350 Secondary (specific) granules are peroxidase-negative and rich in antimicrobial substances UniProt:O15126 Functions in post-Golgi recycling pathways. Acts as a recycling carrier to the cell surface. |
| GO:0035579 specific granule membrane | TAS Reactome:R-HSA-6799350 | KEEP AS NON CORE | Summary: TAS annotation for specific granule membrane from Reactome. Specific granules are secondary granules in neutrophils containing antimicrobial substances. Reason: This is a neutrophil-specific localization related to degranulation. While SCAMP1 is involved, this represents cell-type-specific function rather than core function. Supporting Evidence: Reactome:R-HSA-6799350 Secondary (specific) granules are peroxidase-negative and rich in antimicrobial substances |
| GO:0030136 clathrin-coated vesicle | ISS GO_REF:0000024 | ACCEPT | Summary: ISS annotation for clathrin-coated vesicle localization based on sequence similarity. Reason: Consistent with the IEA annotation; SCAMP1 interacts with clathrin-associated machinery through NPF-EH domain interactions. Supporting Evidence: GO_REF:0000024 Manual transfer of experimentally-verified manual GO annotation data to orthologs |
| 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 NHE7 (SLC9A7). This is from a focused study showing functional interaction between SCAMP1 and NHE7. Reason: While the SCAMP1-NHE7 interaction is experimentally validated, 'protein binding' is uninformative. A more specific term describing the functional relationship would be preferred. SCAMP1 interacts with NHE7 through a conserved cytoplasmic loop to regulate NHE7 trafficking. Proposed replacements: protein domain specific binding Supporting Evidence: PMID:15840657 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 |
| GO:0005802 trans-Golgi network | IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr... | ACCEPT | Summary: IDA annotation for trans-Golgi network localization based on direct experimental evidence from Lin et al. 2005. Reason: Strong experimental evidence from co-immunolocalization and sucrose gradient fractionation demonstrating SCAMP1 accumulation at the TGN. This is a core localization site. 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:0015031 protein transport | IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr... | ACCEPT | Summary: IDA annotation for protein transport based on functional studies showing SCAMP1 regulates NHE7 trafficking between TGN and recycling vesicles. Reason: The experimental evidence demonstrates that SCAMP1 participates in shuttling cargo proteins between compartments, representing a core function. 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 from the same study. Reason: SCAMP1 is an integral membrane protein demonstrated by fractionation studies. Supporting Evidence: PMID:15840657 co-sedimentation in membrane fractions resolved on sucrose density gradients |
| GO:0055038 recycling endosome membrane | IDA PMID:15840657 Secretory carrier membrane proteins interact and regulate tr... | ACCEPT | Summary: IDA annotation for recycling endosome membrane based on localization studies. Reason: Experimental evidence shows SCAMP1 in recycling vesicles, representing a core localization for its function in cargo recycling. Supporting Evidence: PMID:15840657 a minor fraction also resided in recycling vesicles |
| 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 original characterization of mammalian SCAMPs. Reason: This term accurately captures the core function of SCAMP1 in mediating transport from the Golgi to other cellular destinations via carrier vesicles. Supporting Evidence: PMID:9378760 SCAMPs may largely function at the same sites during vesicular transport rather than in separate post-Golgi recycling pathways |
| GO:0032456 endocytic recycling | TAS file:human/SCAMP1/SCAMP1-deep-research-falcon.md | NEW | Summary: Annotation for endocytic recycling based on deep research review of SCAMP1 literature showing SCAMP1 participates in recycling pathways that return cargo from endosomes to plasma membrane. Reason: SCAMP1 localizes to recycling endosomes and contains NPF motifs that recruit EH-domain endocytic scaffolds (Eps15, intersectin), coupling SCAMP1-containing carriers to the endocytic machinery. Supporting Evidence: file:human/SCAMP1/SCAMP1-deep-research-falcon.md SCAMP1 participates in recycling pathways rather than initial clathrin-coated vesicle formation |
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Download this section (compressed HTML)Q: What is the precise mechanism by which SCAMP1 stabilizes fusion pores during exocytosis, and does this involve its amphipathic E peptide?
Q: Does SCAMP1 have cargo specificity, or does it function as a general trafficking factor for post-Golgi recycling?
Experiment: Live-cell imaging of SCAMP1 dynamics during regulated secretion in neuroendocrine cells to characterize its role in exocytosis and compensatory endocytosis. Would clarify the temporal relationship between SCAMP1 localization and fusion pore dynamics.
Experiment: Proximity labeling (BioID/APEX) of SCAMP1 to comprehensively identify cargo proteins and trafficking machinery that co-localize with SCAMP1 carriers. Would expand understanding of SCAMP1 cargo specificity and interaction partners beyond NHE7 and CFTR.
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