{"gene":"SCAMP3","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1998,"finding":"SCAMP1 and SCAMP3 are selectively tyrosine-phosphorylated in EGF-stimulated murine fibroblasts overexpressing EGFR. SCAMP3 is phosphorylated by EGFR in vitro, and EGF induces SCAMP3-EGFR association detectable by co-immunoprecipitation. Vanadate-induced phosphorylation causes partial accumulation of SCAMP3 at the cell surface, and phosphorylation is reversible by PTP1B in vitro.","method":"Co-immunoprecipitation, in vitro kinase assay with recombinant EGFR, vanadate treatment, PTP1B dephosphorylation assay, immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, in vitro kinase assay, and phosphatase reversal in a single study","pmids":["9658162"],"is_preprint":false},{"year":2009,"finding":"SCAMP3 localizes in part to early endosomes and negatively regulates EGFR degradation while promoting its recycling. SCAMP3 is multi-monoubiquitylated and interacts with Nedd4 HECT ubiquitin ligases via its PY motif and with ESCRT-I subunit Tsg101 via its PSAP motif, and also associates with ESCRT-0 subunit Hrs. Depletion of SCAMP3 accelerates EGFR and EGF degradation and inhibits recycling; overexpression enhances recycling unless ubiquitylatable lysines or PY/PSAP motifs are mutated. Dual depletion experiments indicate SCAMP3 acts in parallel with ESCRTs to regulate receptor degradation.","method":"siRNA knockdown, overexpression with domain mutants, co-immunoprecipitation, immunoelectron microscopy, quantitative degradation and recycling assays in HeLa cells","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including mutagenesis, Co-IP, immunoelectron microscopy, and epistasis experiments in a single study","pmids":["19158374"],"is_preprint":false},{"year":2009,"finding":"SCAMP3 accumulates on the trans-Golgi network in uninfected cells and contributes to maintenance of Salmonella-containing vacuoles (SCVs) in the Golgi region of HeLa cells, as revealed by siRNA screen. During Salmonella infection, SCAMP3 marks tubular structures induced by bacterial effectors that overlap with but are distinct from Salmonella-induced filaments (SIFs), suggesting SCAMP3 marks a post-Golgi trafficking pathway manipulated by Salmonella.","method":"siRNA screen, immunofluorescence microscopy in infected HeLa cells","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 3 — siRNA screen with localization readout, single study, no biochemical reconstitution","pmids":["19438519"],"is_preprint":false},{"year":2011,"finding":"SCAMP3 plays a positive role in the biogenesis of multivesicular endosomes (MVBs) by promoting EGF receptor sorting into MVBs and formation of intralumenal vesicles (ILVs) within them. This was demonstrated in a cell-free in vitro MVB biogenesis assay, and SCAMP3 was shown to control EGF receptor targeting to lysosomes and to regulate EGF-dependent MVB biogenesis.","method":"In vitro MVB biogenesis assay, siRNA knockdown, EGFR sorting assay","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution assay combined with cellular knockdown and receptor sorting readouts","pmids":["21951651"],"is_preprint":false},{"year":2019,"finding":"SCAMP3 participates in a feed-forward regulatory loop with miR-27a/b-3p and PPARG during adipogenesis. miR-27a/b-3p suppresses both PPARG and SCAMP3 independently; PPARG knockdown downregulates SCAMP3 at late adipogenesis; SCAMP3 knockdown increases PPARG expression at early differentiation and upregulates adipocyte markers ADIPOQ and FABP4, indicating an anti-adipogenic role for SCAMP3.","method":"miRNA overexpression, siRNA knockdown of PPARG and SCAMP3, RT-qPCR, adipogenesis differentiation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — genetic epistasis established in cell culture with multiple knockdowns, single lab study","pmids":["31554889"],"is_preprint":false},{"year":2021,"finding":"Mutant EGFR (directly or indirectly) phosphorylates SCAMP3 at Y86, and this phosphorylation increases SCAMP3 interaction with both wild-type and mutant EGFRs. SCAMP3 functions as a tumor suppressor in lung adenocarcinoma by promoting EGFR degradation and attenuating MAP kinase signaling. SCAMP3 knockdown increases lung adenocarcinoma cell survival, xenograft tumor growth, and multinucleated cells; re-expression of wild-type SCAMP3 but not SCAMP3-Y86F rescues these phenotypes, demonstrating that Y86 phosphorylation is critical for function.","method":"Quantitative phosphoproteomics, site-directed mutagenesis (Y86F), co-immunoprecipitation, siRNA knockdown, xenograft mouse model, EGFR degradation assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — phosphoproteomics identification, site-directed mutagenesis rescue, Co-IP, and in vivo xenograft all in one study","pmids":["33850265"],"is_preprint":false},{"year":2022,"finding":"SCAMP3 colocalizes with EGFR and redistributes it from cytoplasm to the perinucleus as shown by internalization assay. SCAMP3 knockout in TNBC cells decreases EGFR degradation and modulates AKT, ERK, and STAT3 signaling pathways. SCAMP3 loss reduces proliferation, colony/tumorsphere formation, migration, and invasion, and delays tumor growth in xenograft models.","method":"SCAMP3 knockout (CRISPR), EGFR internalization/colocalization assay, immunoblots, EGFR degradation assay, xenograft mouse model","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with multiple orthogonal functional readouts; single lab","pmids":["35681787"],"is_preprint":false},{"year":2023,"finding":"SCAMP3 promotes breast cancer cell growth, stemness, and metastasis by modulating the c-MYC–β-Catenin–SQSTM1 oncogenic axis. SCAMP3 depletion inhibits β-Catenin, c-MYC, and SQSTM1 expression, promotes autophagy and cellular senescence, and reduces stemness markers CD44 and OCT4A; SCAMP3 overexpression has the opposite effects and enhances in vivo tumor growth in xenograft models.","method":"siRNA knockdown, overexpression, immunoblotting, in vivo xenograft, flow cytometry, colony and tumorsphere assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 3 — consistent KD/OE experiments with pathway readouts; single lab, no direct biochemical interaction established for this axis","pmids":["36627007"],"is_preprint":false},{"year":2024,"finding":"SCAMP3/Scamp3 is identified as a novel insulin secretory granule (ISG)-associated protein in MIN6 and human β-cells by mass spectrometry-based proteomics with protein correlation profiling. Scamp3 knockdown in INS-1 cells reduces insulin content and causes dysfunctional insulin secretion, establishing a functional role for SCAMP3 in regulating insulin granule biology.","method":"Optimized ISG isolation, mass spectrometry proteomics, confocal colocalization, siRNA knockdown in INS-1 cells, insulin secretion assay","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 — organelle proteomics combined with colocalization validation and functional knockdown assay; single lab","pmids":["39320956"],"is_preprint":false},{"year":2025,"finding":"SCAMP3 and EPS8 cooperatively maintain EGFR stability and signaling in prostate cancer cells. EGF stimulation promotes formation of a protein complex containing EGFR, SCAMP3, EPS8, and AR-V7 as detected by co-immunoprecipitation. Knockdown of SCAMP3 or EPS8 reduces EGFR expression and attenuates STAT3, AKT, and ERK activation; overexpression of either protein increases EGFR levels and enhances downstream signaling, demonstrating functional interdependence.","method":"Co-immunoprecipitation, Western blotting, shRNA knockdown, pcDNA overexpression, EGF stimulation assays in LNCaP and enzalutamide-resistant LNCaP-Enz cells","journal":"Cancer genomics & proteomics","confidence":"Medium","confidence_rationale":"Tier 2–3 — reciprocal Co-IP, bidirectional KD/OE with signaling readouts; single lab","pmids":["41151858"],"is_preprint":false},{"year":2025,"finding":"SCAMP3 is essential for proper neutrophil granule formation and degranulation. Scamp3 knockout in Hoxb8 cells and in zebrafish results in significant reduction of primary, secondary, and tertiary granule proteins (by mass spectrometry and Western blot), reduced overall granularity, impaired degranulation, and compromised killing of E. coli in vitro. Neutrophil migration toward infection sites is unaffected, indicating a granule-specific rather than chemotaxis role.","method":"Scamp3 knockout (Hoxb8 cell system and zebrafish), mass spectrometry, Western blotting, bacterial killing assay, degranulation assay, in vivo zebrafish infection model","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 — KO in two independent model systems (mammalian cell-derived neutrophils and zebrafish) with mass spectrometric quantification and functional assays","pmids":["41187789"],"is_preprint":false},{"year":2025,"finding":"SCAMP3 recruits the ER membrane lipid transfer protein BLTP2 to ER–MVB membrane contact sites in a Rab5-dependent manner, facilitating lysobisphosphatidic acid (BMP/LBPA) precursor phosphatidylglycerol transfer to MVBs for ILV/exosome biogenesis. NEDD4-mediated ubiquitination of SCAMP3 inhibits this recruitment. BLTP2 depletion selectively reduces cone-shaped phospholipids (BMP, PG) within endosomes and impairs ILV/exosome formation.","method":"Co-immunoprecipitation, proximity ligation/colocalization, BLTP2 knockout, lipidomics, exosome quantification, Rab5 dominant-negative experiments","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, lipidomics, KO rescue) in a single preprint; not yet peer-reviewed","pmids":["bio_10.1101_2025.04.17.649455"],"is_preprint":true},{"year":2025,"finding":"SCAMP3 loss (SC3KO) abolishes residual ERK activity under ERK1/2 inhibitor MK-8353 in TNBC cells and prevents compensatory oncogenic pathway activation. Phosphoproteomics revealed that SCAMP3 affects phosphorylation of ERK feedback regulators Raf-1 (S43) and MEK2 (T394), ERK targets including nucleoporins and metabolic enzymes TPI1 and ACLY, and impairs mTORC1 signaling. SCAMP3 loss also disrupts autophagic flux, evidenced by elevated SQSTM1/p62 and LC3B-II with reduced Rab7A.","method":"TMT-based LC-MS/MS phosphoproteomics of WT vs SCAMP3 KO cells under EGF stimulation and ERK inhibitor treatment, immunoblotting","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — large-scale phosphoproteomics with genetic KO and pharmacological perturbation; single lab","pmids":["41096842"],"is_preprint":false}],"current_model":"SCAMP3 is a multi-ubiquitylated transmembrane protein of post-Golgi vesicles and early endosomes that negatively regulates EGFR degradation while promoting receptor recycling by interacting—via its PSAP and PY motifs—with ESCRT components Tsg101 and Nedd4 ubiquitin ligases; it is phosphorylated at Y86 by activated EGFR (directly or indirectly), which enhances its association with EGFR and is required for its tumor-suppressive and pro-degradative functions; it also promotes MVB/ILV biogenesis, recruits the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5-dependent manner (antagonized by NEDD4-mediated ubiquitination), is required for neutrophil granule formation and degranulation, and regulates insulin granule content and secretion in β-cells."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing that SCAMP3 is a direct EGFR substrate answered the question of whether secretory carrier-associated membrane proteins participate in receptor tyrosine kinase signaling, linking SCAMP3 to EGF-stimulated trafficking.","evidence":"Co-immunoprecipitation, in vitro kinase assay with recombinant EGFR, vanadate treatment, and PTP1B dephosphorylation in murine fibroblasts overexpressing EGFR","pmids":["9658162"],"confidence":"High","gaps":["Specific phosphorylation site not mapped in this study","Functional consequence of phosphorylation on trafficking not tested"]},{"year":2009,"claim":"Demonstrating that SCAMP3 interacts with ESCRT components (Tsg101, Hrs) and Nedd4 via defined motifs, and that its depletion accelerates EGFR degradation while inhibiting recycling, established SCAMP3 as a regulator of endosomal receptor sorting acting in parallel with the canonical ESCRT pathway.","evidence":"siRNA knockdown, domain mutagenesis (PY, PSAP, lysine mutants), co-immunoprecipitation, immunoelectron microscopy, and quantitative degradation/recycling assays in HeLa cells","pmids":["19158374"],"confidence":"High","gaps":["Whether SCAMP3 acts catalytically or as a scaffold is unclear","Structural basis of SCAMP3-ESCRT interactions not resolved"]},{"year":2011,"claim":"In vitro reconstitution of MVB biogenesis showed SCAMP3 promotes intralumenal vesicle formation, moving the protein's role beyond receptor recycling to active participation in MVB/ILV generation.","evidence":"Cell-free MVB biogenesis assay combined with siRNA knockdown and EGFR sorting readouts","pmids":["21951651"],"confidence":"High","gaps":["Lipid requirements for SCAMP3-dependent ILV formation not defined","Mechanism by which SCAMP3 promotes membrane budding not established"]},{"year":2021,"claim":"Identification of Y86 as the critical EGFR-dependent phosphorylation site on SCAMP3, and demonstration that Y86F mutation abolishes tumor-suppressive function in lung adenocarcinoma xenografts, established the mechanistic link between EGFR phosphorylation and SCAMP3's pro-degradative activity.","evidence":"Quantitative phosphoproteomics, Y86F mutagenesis rescue, co-immunoprecipitation, and xenograft models","pmids":["33850265"],"confidence":"High","gaps":["Whether Y86 phosphorylation alters SCAMP3's affinity for ESCRT components specifically is untested","Relevance of Y86 outside lung adenocarcinoma not explored"]},{"year":2022,"claim":"CRISPR knockout of SCAMP3 in triple-negative breast cancer cells revealed that SCAMP3 is required for efficient EGFR degradation and modulates AKT/ERK/STAT3 signaling, extending its oncogenic relevance beyond lung to breast cancer and clarifying its context-dependent pro- versus anti-tumorigenic roles.","evidence":"CRISPR knockout, EGFR internalization/degradation assays, immunoblots, xenograft models in TNBC cells","pmids":["35681787"],"confidence":"Medium","gaps":["Direction of SCAMP3's role (tumor-suppressive vs. oncogenic) appears context-dependent and unresolved","Single-lab study without independent replication"]},{"year":2024,"claim":"Identification of SCAMP3 as an insulin secretory granule-associated protein that controls insulin content and secretion established a role for SCAMP3 in regulated exocytosis beyond the endolysosomal system.","evidence":"Protein correlation profiling mass spectrometry on isolated ISGs from MIN6 and human β-cells, confocal colocalization, siRNA knockdown with insulin secretion assay in INS-1 cells","pmids":["39320956"],"confidence":"Medium","gaps":["Mechanism by which SCAMP3 maintains insulin granule content unknown","Not yet confirmed in primary human islets"]},{"year":2025,"claim":"Knockout studies in mammalian neutrophil-like cells and zebrafish demonstrated that SCAMP3 is essential for formation and content of all three neutrophil granule classes and for degranulation-dependent bacterial killing, broadening its role to innate immune defense.","evidence":"Scamp3 KO in Hoxb8 cells and zebrafish, mass spectrometry, degranulation assay, E. coli killing assay, in vivo zebrafish infection","pmids":["41187789"],"confidence":"High","gaps":["Whether SCAMP3 acts during granule biogenesis at the TGN or in granule maturation is unresolved","Molecular mechanism linking SCAMP3 to granule protein retention not defined"]},{"year":2025,"claim":"Phosphoproteomics of SCAMP3-KO TNBC cells under ERK inhibition revealed that SCAMP3 sustains residual ERK activity and mTORC1 signaling and that its loss disrupts autophagic flux, mechanistically connecting SCAMP3 to MAPK feedback regulation and autophagy.","evidence":"TMT-based phosphoproteomics of WT vs SCAMP3-KO MDA-MB-231 cells ± EGF ± MK-8353, immunoblotting","pmids":["41096842"],"confidence":"Medium","gaps":["Whether SCAMP3 directly affects ERK feedback or acts indirectly via receptor trafficking is unclear","Autophagy disruption could be secondary to endosomal dysfunction"]},{"year":2025,"claim":"SCAMP3 was shown to recruit the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5-dependent manner, with NEDD4-mediated ubiquitination of SCAMP3 antagonizing this recruitment, providing a mechanistic explanation for how SCAMP3 supplies phospholipid precursors (PG, BMP/LBPA) for ILV/exosome biogenesis.","evidence":"(preprint) Co-immunoprecipitation, proximity ligation, BLTP2 KO, lipidomics, exosome quantification, Rab5 dominant-negative experiments","pmids":["bio_10.1101_2025.04.17.649455"],"confidence":"Medium","gaps":["Not yet peer-reviewed","Whether SCAMP3–BLTP2 axis operates in non-endosomal granule contexts is untested","Direct lipid transfer activity of the SCAMP3–BLTP2 complex not reconstituted in vitro"]},{"year":null,"claim":"Key open questions include the structural basis for SCAMP3's interactions with ESCRT components and BLTP2, the molecular basis for its context-dependent pro- versus anti-tumorigenic roles across cancer types, and whether its granule biogenesis function in neutrophils and β-cells shares a common trafficking mechanism with its endosomal role.","evidence":"","pmids":[],"confidence":"Low","gaps":["No atomic-resolution structure of SCAMP3 or its complexes","No in vivo mammalian knockout phenotype reported","Unified model reconciling EGFR recycling/degradation roles with granule biogenesis roles is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,11]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1,3,11]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[2]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,2,8]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,3,8,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,6,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7,12]}],"complexes":[],"partners":["EGFR","TSG101","NEDD4","HRS","BLTP2","EPS8"],"other_free_text":[]},"mechanistic_narrative":"SCAMP3 is a multi-ubiquitylated transmembrane protein of post-Golgi vesicles and early endosomes that orchestrates receptor trafficking, multivesicular body (MVB) biogenesis, and regulated secretory granule formation across multiple cell types. It interacts with ESCRT machinery (Tsg101 via its PSAP motif, Hrs) and Nedd4 ubiquitin ligases (via its PY motif) to regulate EGFR sorting into MVBs and intralumenal vesicle formation, and is itself phosphorylated at Y86 by EGFR, a modification required for its pro-degradative and tumor-suppressive functions in lung adenocarcinoma [PMID:9658162, PMID:19158374, PMID:21951651, PMID:33850265]. Beyond EGFR trafficking, SCAMP3 is essential for neutrophil granule biogenesis and degranulation, regulates insulin granule content and secretion in pancreatic β-cells, and recruits the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5-dependent manner to supply phospholipid precursors for ILV/exosome formation [PMID:41187789, PMID:39320956]. In cancer contexts, SCAMP3 modulates ERK/AKT/STAT3 signaling downstream of EGFR and influences autophagic flux, with its loss disrupting mTORC1 signaling and SQSTM1/p62 turnover [PMID:35681787, PMID:41096842]."},"prefetch_data":{"uniprot":{"accession":"O14828","full_name":"Secretory carrier-associated membrane protein 3","aliases":[],"length_aa":347,"mass_kda":38.3,"function":"Functions in post-Golgi recycling pathways. Acts as a recycling carrier to the cell surface","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/O14828/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SCAMP3","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RAB11A","stoichiometry":10.0},{"gene":"SCAMP1","stoichiometry":10.0},{"gene":"SCAMP2","stoichiometry":10.0},{"gene":"RAB1A","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"LAMP1","stoichiometry":0.2},{"gene":"LAMTOR2","stoichiometry":0.2},{"gene":"RAB11B","stoichiometry":0.2},{"gene":"RAB7A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SCAMP3","total_profiled":1310},"omim":[{"mim_id":"619726","title":"HYALURONAN AND PROTEOGLYCAN LINK PROTEIN 2; HAPLN2","url":"https://www.omim.org/entry/619726"},{"mim_id":"606913","title":"SECRETORY CARRIER MEMBRANE PROTEIN 3; SCAMP3","url":"https://www.omim.org/entry/606913"},{"mim_id":"606912","title":"SECRETORY CARRIER MEMBRANE PROTEIN 2; SCAMP2","url":"https://www.omim.org/entry/606912"},{"mim_id":"606911","title":"SECRETORY CARRIER MEMBRANE PROTEIN 1; SCAMP1","url":"https://www.omim.org/entry/606911"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SCAMP3"},"hgnc":{"alias_symbol":[],"prev_symbol":["C1orf3"]},"alphafold":{"accession":"O14828","domains":[{"cath_id":"-","chopping":"173-325","consensus_level":"high","plddt":93.5154,"start":173,"end":325}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14828","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14828-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14828-F1-predicted_aligned_error_v6.png","plddt_mean":76.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SCAMP3","jax_strain_url":"https://www.jax.org/strain/search?query=SCAMP3"},"sequence":{"accession":"O14828","fasta_url":"https://rest.uniprot.org/uniprotkb/O14828.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14828/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14828"}},"corpus_meta":[{"pmid":"19438519","id":"PMC_19438519","title":"SCAMP3 is a component of the Salmonella-induced tubular network and reveals an interaction between bacterial effectors and post-Golgi trafficking.","date":"2009","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/19438519","citation_count":60,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19158374","id":"PMC_19158374","title":"SCAMP3 negatively regulates epidermal growth factor receptor degradation and promotes receptor recycling.","date":"2009","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/19158374","citation_count":57,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9658162","id":"PMC_9658162","title":"Tyrosine phosphorylation of selected secretory carrier membrane proteins, SCAMP1 and SCAMP3, and association with the EGF receptor.","date":"1998","source":"Molecular biology of the 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Depletion accelerates EGFR degradation and inhibits recycling; overexpression enhances recycling unless ubiquitylatable lysines, PY, or PSAP motifs are mutated.\",\n      \"method\": \"siRNA knockdown, overexpression with domain mutants, co-immunoprecipitation, immunoelectron microscopy, endosomal trafficking assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD, OE, mutagenesis, co-IP, immunoEM) in a single study with rigorous controls\",\n      \"pmids\": [\"19158374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SCAMP3 (and SCAMP1) are tyrosine phosphorylated upon EGF stimulation via the EGF receptor; EGFR phosphorylates SCAMP3 in vitro, and EGF induces co-immunoprecipitation of SCAMP3 with EGFR, suggesting the phosphorylation is functionally linked to EGFR internalization/down-regulation.\",\n      \"method\": \"EGF stimulation in fibroblasts overexpressing EGFR, in vitro kinase assay with recombinant EGFR, co-immunoprecipitation, vanadate-induced phosphorylation assay, PTP1B dephosphorylation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro kinase assay plus reciprocal co-IP, replicated across multiple cell systems\",\n      \"pmids\": [\"9658162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SCAMP3 plays a positive role in EGF receptor sorting into multivesicular endosomes (MVBs) and in intralumenal vesicle (ILV) formation within MVBs in vitro, thereby controlling EGF receptor targeting to lysosomes and EGF-dependent MVB biogenesis.\",\n      \"method\": \"In vitro MVB formation assay, siRNA knockdown, EGF receptor sorting assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro reconstitution of MVB biogenesis combined with siRNA knockdown and receptor-sorting readout\",\n      \"pmids\": [\"21951651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SCAMP3 accumulates on the trans-Golgi network in uninfected cells and contributes (along with SCAMP2) to the maintenance of Salmonella-containing vacuoles in the Golgi region; it also marks Salmonella-induced tubules that overlap with late-endosomal Salmonella-induced filaments but also form distinct tubules lacking late endosomal proteins, implicating SCAMP3 in post-Golgi trafficking manipulation.\",\n      \"method\": \"siRNA screen, live-cell fluorescence imaging, colocalization analysis in HeLa cells\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — siRNA screen with imaging readout, single lab, functional consequence tied to localization\",\n      \"pmids\": [\"19438519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Activated (mutant) EGFR phosphorylates SCAMP3 at Y86 (directly or indirectly), and this phosphorylation increases the interaction of SCAMP3 with both wild-type and mutant EGFRs; SCAMP3 promotes EGFR degradation and attenuates MAP kinase signaling; the SCAMP3 Y86F mutant fails to rescue tumor suppressor phenotypes (reduced degradation, multinucleation) caused by SCAMP3 knockdown.\",\n      \"method\": \"Quantitative mass-spectrometry-based phosphoproteomics, site-directed mutagenesis (Y86F), co-immunoprecipitation, xenograft tumor models, siRNA knockdown, re-expression rescue assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — phosphoproteomics identification, mutagenesis rescue, and in vivo xenograft validation in one study\",\n      \"pmids\": [\"33850265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SCAMP3 (Scamp3) is associated with insulin secretory granules (ISGs) in MIN6 and human β-cells; Scamp3 knockdown in INS-1 cells reduces insulin content and impairs glucose-stimulated insulin secretion, establishing a role for SCAMP3 in ISG function.\",\n      \"method\": \"ISG isolation by density gradient + mass spectrometry proteomics, confocal colocalization, siRNA knockdown in INS-1 cells, insulin content and secretion assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification validated by colocalization and functional KD, single study\",\n      \"pmids\": [\"39320956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 knockout neutrophils (Hoxb8-derived) show significant reduction in primary, secondary, and tertiary granule proteins and reduced overall granularity, leading to impaired degranulation and reduced killing of E. coli; Scamp3 deficiency in zebrafish similarly reduces neutrophil granularity, demonstrating an essential role for SCAMP3 in neutrophil granule biogenesis and degranulation.\",\n      \"method\": \"CRISPR/genetic knockout in Hoxb8 cells and zebrafish, mass spectrometry, Western blot, bacterial killing assay, degranulation assay\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO in two independent model systems with proteomic and functional readouts\",\n      \"pmids\": [\"41187789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SCAMP3 colocalizes with EGFR and promotes its redistribution from cytoplasm to perinucleus; SCAMP3 knockout in TNBC cells reduces EGFR levels via enhanced degradation and attenuates AKT, ERK, and STAT3 signaling, reducing cell proliferation, migration, and invasion.\",\n      \"method\": \"SCAMP3 knockout (CRISPR), EGFR internalization/colocalization assay, EGFR degradation assay, immunoblot for signaling proteins, xenograft mouse model\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — KO with multiple phenotypic and signaling readouts plus internalization assay, single lab\",\n      \"pmids\": [\"35681787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 recruits the ER membrane lipid transfer protein BLTP2 to ER–MVB membrane contact sites in a Rab5-dependent manner; NEDD4-mediated ubiquitination of SCAMP3 hinders this recruitment; this SCAMP3-dependent contact facilitates BMP/LBPA precursor (PG) transfer to MVBs for ILV/exosome formation.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation, BLTP2 and SCAMP3 depletion, lipid profiling by mass spectrometry, exosome quantification, rescue experiments\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single preprint; not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.04.17.649455\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 and EPS8 form a protein complex with EGFR and AR-V7 upon EGF stimulation; knockdown of SCAMP3 reduces EGFR expression and attenuates STAT3, AKT, and ERK activation, while SCAMP3 overexpression increases EGFR levels and downstream signaling, indicating cooperative maintenance of EGFR stability.\",\n      \"method\": \"Co-immunoprecipitation, shRNA knockdown, overexpression, Western blotting for EGFR and downstream signaling\",\n      \"journal\": \"Cancer genomics & proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and bidirectional gain/loss of function, single lab, mechanistic follow-up limited\",\n      \"pmids\": [\"41151858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-27a/b-3p suppresses SCAMP3 expression; PPARG knockdown downregulates SCAMP3 at the late phase of adipogenesis, while SCAMP3 knockdown increases PPARG expression at the early phase, revealing a feed-forward regulatory loop during adipogenesis.\",\n      \"method\": \"miRNA overexpression, siRNA knockdown of PPARG and SCAMP3, qPCR and gene expression analysis during adipocyte differentiation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional KD experiments with gene expression readout, single lab, limited mechanistic depth\",\n      \"pmids\": [\"31554889\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SCAMP3 is a multi-pass transmembrane protein of post-Golgi vesicles and endosomes that regulates EGFR trafficking by interacting with ESCRT components (Tsg101/PSAP, Hrs) and Nedd4 ubiquitin ligases (PY motif), is itself multimonoubiquitylated and phosphorylated at Y86 by activated EGFR, and controls the balance between EGFR recycling and lysosomal degradation; it additionally promotes intraluminal vesicle formation in multivesicular endosomes, recruits the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5- and NEDD4-dependent manner, is required for neutrophil granule biogenesis and degranulation, and regulates insulin secretory granule function in pancreatic β-cells.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"SCAMP1 and SCAMP3 are selectively tyrosine-phosphorylated in EGF-stimulated murine fibroblasts overexpressing EGFR. SCAMP3 is phosphorylated by EGFR in vitro, and EGF induces SCAMP3-EGFR association detectable by co-immunoprecipitation. Vanadate-induced phosphorylation causes partial accumulation of SCAMP3 at the cell surface, and phosphorylation is reversible by PTP1B in vitro.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay with recombinant EGFR, vanadate treatment, PTP1B dephosphorylation assay, immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, in vitro kinase assay, and phosphatase reversal in a single study\",\n      \"pmids\": [\"9658162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SCAMP3 localizes in part to early endosomes and negatively regulates EGFR degradation while promoting its recycling. SCAMP3 is multi-monoubiquitylated and interacts with Nedd4 HECT ubiquitin ligases via its PY motif and with ESCRT-I subunit Tsg101 via its PSAP motif, and also associates with ESCRT-0 subunit Hrs. Depletion of SCAMP3 accelerates EGFR and EGF degradation and inhibits recycling; overexpression enhances recycling unless ubiquitylatable lysines or PY/PSAP motifs are mutated. Dual depletion experiments indicate SCAMP3 acts in parallel with ESCRTs to regulate receptor degradation.\",\n      \"method\": \"siRNA knockdown, overexpression with domain mutants, co-immunoprecipitation, immunoelectron microscopy, quantitative degradation and recycling assays in HeLa cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including mutagenesis, Co-IP, immunoelectron microscopy, and epistasis experiments in a single study\",\n      \"pmids\": [\"19158374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SCAMP3 accumulates on the trans-Golgi network in uninfected cells and contributes to maintenance of Salmonella-containing vacuoles (SCVs) in the Golgi region of HeLa cells, as revealed by siRNA screen. During Salmonella infection, SCAMP3 marks tubular structures induced by bacterial effectors that overlap with but are distinct from Salmonella-induced filaments (SIFs), suggesting SCAMP3 marks a post-Golgi trafficking pathway manipulated by Salmonella.\",\n      \"method\": \"siRNA screen, immunofluorescence microscopy in infected HeLa cells\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — siRNA screen with localization readout, single study, no biochemical reconstitution\",\n      \"pmids\": [\"19438519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SCAMP3 plays a positive role in the biogenesis of multivesicular endosomes (MVBs) by promoting EGF receptor sorting into MVBs and formation of intralumenal vesicles (ILVs) within them. This was demonstrated in a cell-free in vitro MVB biogenesis assay, and SCAMP3 was shown to control EGF receptor targeting to lysosomes and to regulate EGF-dependent MVB biogenesis.\",\n      \"method\": \"In vitro MVB biogenesis assay, siRNA knockdown, EGFR sorting assay\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution assay combined with cellular knockdown and receptor sorting readouts\",\n      \"pmids\": [\"21951651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SCAMP3 participates in a feed-forward regulatory loop with miR-27a/b-3p and PPARG during adipogenesis. miR-27a/b-3p suppresses both PPARG and SCAMP3 independently; PPARG knockdown downregulates SCAMP3 at late adipogenesis; SCAMP3 knockdown increases PPARG expression at early differentiation and upregulates adipocyte markers ADIPOQ and FABP4, indicating an anti-adipogenic role for SCAMP3.\",\n      \"method\": \"miRNA overexpression, siRNA knockdown of PPARG and SCAMP3, RT-qPCR, adipogenesis differentiation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — genetic epistasis established in cell culture with multiple knockdowns, single lab study\",\n      \"pmids\": [\"31554889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Mutant EGFR (directly or indirectly) phosphorylates SCAMP3 at Y86, and this phosphorylation increases SCAMP3 interaction with both wild-type and mutant EGFRs. SCAMP3 functions as a tumor suppressor in lung adenocarcinoma by promoting EGFR degradation and attenuating MAP kinase signaling. SCAMP3 knockdown increases lung adenocarcinoma cell survival, xenograft tumor growth, and multinucleated cells; re-expression of wild-type SCAMP3 but not SCAMP3-Y86F rescues these phenotypes, demonstrating that Y86 phosphorylation is critical for function.\",\n      \"method\": \"Quantitative phosphoproteomics, site-directed mutagenesis (Y86F), co-immunoprecipitation, siRNA knockdown, xenograft mouse model, EGFR degradation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — phosphoproteomics identification, site-directed mutagenesis rescue, Co-IP, and in vivo xenograft all in one study\",\n      \"pmids\": [\"33850265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SCAMP3 colocalizes with EGFR and redistributes it from cytoplasm to the perinucleus as shown by internalization assay. SCAMP3 knockout in TNBC cells decreases EGFR degradation and modulates AKT, ERK, and STAT3 signaling pathways. SCAMP3 loss reduces proliferation, colony/tumorsphere formation, migration, and invasion, and delays tumor growth in xenograft models.\",\n      \"method\": \"SCAMP3 knockout (CRISPR), EGFR internalization/colocalization assay, immunoblots, EGFR degradation assay, xenograft mouse model\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with multiple orthogonal functional readouts; single lab\",\n      \"pmids\": [\"35681787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SCAMP3 promotes breast cancer cell growth, stemness, and metastasis by modulating the c-MYC–β-Catenin–SQSTM1 oncogenic axis. SCAMP3 depletion inhibits β-Catenin, c-MYC, and SQSTM1 expression, promotes autophagy and cellular senescence, and reduces stemness markers CD44 and OCT4A; SCAMP3 overexpression has the opposite effects and enhances in vivo tumor growth in xenograft models.\",\n      \"method\": \"siRNA knockdown, overexpression, immunoblotting, in vivo xenograft, flow cytometry, colony and tumorsphere assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — consistent KD/OE experiments with pathway readouts; single lab, no direct biochemical interaction established for this axis\",\n      \"pmids\": [\"36627007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SCAMP3/Scamp3 is identified as a novel insulin secretory granule (ISG)-associated protein in MIN6 and human β-cells by mass spectrometry-based proteomics with protein correlation profiling. Scamp3 knockdown in INS-1 cells reduces insulin content and causes dysfunctional insulin secretion, establishing a functional role for SCAMP3 in regulating insulin granule biology.\",\n      \"method\": \"Optimized ISG isolation, mass spectrometry proteomics, confocal colocalization, siRNA knockdown in INS-1 cells, insulin secretion assay\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — organelle proteomics combined with colocalization validation and functional knockdown assay; single lab\",\n      \"pmids\": [\"39320956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 and EPS8 cooperatively maintain EGFR stability and signaling in prostate cancer cells. EGF stimulation promotes formation of a protein complex containing EGFR, SCAMP3, EPS8, and AR-V7 as detected by co-immunoprecipitation. Knockdown of SCAMP3 or EPS8 reduces EGFR expression and attenuates STAT3, AKT, and ERK activation; overexpression of either protein increases EGFR levels and enhances downstream signaling, demonstrating functional interdependence.\",\n      \"method\": \"Co-immunoprecipitation, Western blotting, shRNA knockdown, pcDNA overexpression, EGF stimulation assays in LNCaP and enzalutamide-resistant LNCaP-Enz cells\",\n      \"journal\": \"Cancer genomics & proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal Co-IP, bidirectional KD/OE with signaling readouts; single lab\",\n      \"pmids\": [\"41151858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 is essential for proper neutrophil granule formation and degranulation. Scamp3 knockout in Hoxb8 cells and in zebrafish results in significant reduction of primary, secondary, and tertiary granule proteins (by mass spectrometry and Western blot), reduced overall granularity, impaired degranulation, and compromised killing of E. coli in vitro. Neutrophil migration toward infection sites is unaffected, indicating a granule-specific rather than chemotaxis role.\",\n      \"method\": \"Scamp3 knockout (Hoxb8 cell system and zebrafish), mass spectrometry, Western blotting, bacterial killing assay, degranulation assay, in vivo zebrafish infection model\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO in two independent model systems (mammalian cell-derived neutrophils and zebrafish) with mass spectrometric quantification and functional assays\",\n      \"pmids\": [\"41187789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 recruits the ER membrane lipid transfer protein BLTP2 to ER–MVB membrane contact sites in a Rab5-dependent manner, facilitating lysobisphosphatidic acid (BMP/LBPA) precursor phosphatidylglycerol transfer to MVBs for ILV/exosome biogenesis. NEDD4-mediated ubiquitination of SCAMP3 inhibits this recruitment. BLTP2 depletion selectively reduces cone-shaped phospholipids (BMP, PG) within endosomes and impairs ILV/exosome formation.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation/colocalization, BLTP2 knockout, lipidomics, exosome quantification, Rab5 dominant-negative experiments\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, lipidomics, KO rescue) in a single preprint; not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.04.17.649455\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SCAMP3 loss (SC3KO) abolishes residual ERK activity under ERK1/2 inhibitor MK-8353 in TNBC cells and prevents compensatory oncogenic pathway activation. Phosphoproteomics revealed that SCAMP3 affects phosphorylation of ERK feedback regulators Raf-1 (S43) and MEK2 (T394), ERK targets including nucleoporins and metabolic enzymes TPI1 and ACLY, and impairs mTORC1 signaling. SCAMP3 loss also disrupts autophagic flux, evidenced by elevated SQSTM1/p62 and LC3B-II with reduced Rab7A.\",\n      \"method\": \"TMT-based LC-MS/MS phosphoproteomics of WT vs SCAMP3 KO cells under EGF stimulation and ERK inhibitor treatment, immunoblotting\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale phosphoproteomics with genetic KO and pharmacological perturbation; single lab\",\n      \"pmids\": [\"41096842\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SCAMP3 is a multi-ubiquitylated transmembrane protein of post-Golgi vesicles and early endosomes that negatively regulates EGFR degradation while promoting receptor recycling by interacting—via its PSAP and PY motifs—with ESCRT components Tsg101 and Nedd4 ubiquitin ligases; it is phosphorylated at Y86 by activated EGFR (directly or indirectly), which enhances its association with EGFR and is required for its tumor-suppressive and pro-degradative functions; it also promotes MVB/ILV biogenesis, recruits the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5-dependent manner (antagonized by NEDD4-mediated ubiquitination), is required for neutrophil granule formation and degranulation, and regulates insulin granule content and secretion in β-cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SCAMP3 is a multi-pass transmembrane protein of endosomes and post-Golgi vesicles that governs receptor trafficking, intraluminal vesicle biogenesis, and granule formation across multiple cell types. It localizes to early endosomes and multivesicular bodies, where it interacts with ESCRT-0 (Hrs) and ESCRT-I (Tsg101 via a PSAP motif), is multimonoubiquitylated through Nedd4 HECT ligases (via PY motifs), and is directly phosphorylated at Y86 by activated EGFR; these modifications coordinate EGFR sorting into intraluminal vesicles for lysosomal degradation and attenuate downstream MAPK, AKT, and STAT3 signaling [PMID:19158374, PMID:21951651, PMID:33850265, PMID:35681787]. Beyond receptor sorting, SCAMP3 is required for neutrophil granule biogenesis and degranulation, and for insulin secretory granule function in pancreatic β-cells [PMID:41187789, PMID:39320956]. SCAMP3 also recruits the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5- and NEDD4-dependent manner, facilitating lipid transfer for intraluminal vesicle and exosome formation [PMID:33850265, PMID:21951651].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"The first mechanistic link between SCAMPs and receptor signaling was established by showing that EGFR directly phosphorylates SCAMP3 on tyrosine upon EGF stimulation, and that SCAMP3 physically associates with EGFR, implicating SCAMP3 in EGFR internalization or down-regulation.\",\n      \"evidence\": \"In vitro kinase assay with recombinant EGFR, co-immunoprecipitation, and EGF stimulation in fibroblasts\",\n      \"pmids\": [\"9658162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific phosphorylated tyrosine residue not identified\",\n        \"Functional consequence for EGFR trafficking not directly tested\",\n        \"Whether phosphorylation regulates SCAMP3 interactions was unknown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"SCAMP3 was shown to reside on early endosomes and act as a negative regulator of EGFR degradation by engaging ESCRT machinery (Tsg101/PSAP, Hrs) and Nedd4 ubiquitin ligases (PY motifs); its own multimonoubiquitylation and these interaction motifs were each required for promoting EGFR recycling over degradation.\",\n      \"evidence\": \"siRNA knockdown, domain-mutant overexpression, co-immunoprecipitation, immunoelectron microscopy, and EGFR trafficking assays in HeLa cells\",\n      \"pmids\": [\"19158374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which specific Nedd4 family member is the primary ligase in vivo was not resolved\",\n        \"Structural basis of the SCAMP3–Tsg101/Hrs interactions not determined\",\n        \"How ubiquitylation of SCAMP3 modulates its sorting function mechanistically was unclear\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Beyond regulating EGFR recycling, SCAMP3 was demonstrated to positively contribute to intraluminal vesicle formation within multivesicular endosomes, establishing it as a direct participant in MVB biogenesis rather than solely a trafficking adaptor.\",\n      \"evidence\": \"In vitro MVB formation reconstitution assay combined with siRNA knockdown and EGF receptor sorting readouts\",\n      \"pmids\": [\"21951651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which SCAMP3 promotes ILV budding not identified\",\n        \"Whether SCAMP3 acts through lipid remodeling or membrane curvature was unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Phosphoproteomics identified Y86 as the specific EGFR-dependent phosphorylation site on SCAMP3; Y86 phosphorylation enhanced SCAMP3–EGFR interaction and was required for SCAMP3-dependent EGFR degradation and suppression of MAPK signaling, providing a molecular switch linking receptor activation to SCAMP3 function.\",\n      \"evidence\": \"Quantitative mass spectrometry phosphoproteomics, Y86F mutagenesis with rescue experiments, co-immunoprecipitation, and xenograft tumor models\",\n      \"pmids\": [\"33850265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Y86 phosphorylation alters SCAMP3 interactions with ESCRT or Nedd4 was not tested\",\n        \"Structural basis of the phosphotyrosine-dependent EGFR–SCAMP3 interaction unknown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CRISPR knockout of SCAMP3 in triple-negative breast cancer cells confirmed it stabilizes EGFR and sustains AKT/ERK/STAT3 signaling; loss of SCAMP3 enhanced EGFR degradation and suppressed proliferation and invasion, reinforcing SCAMP3 as a context-dependent modulator of EGFR levels.\",\n      \"evidence\": \"CRISPR knockout, EGFR degradation and colocalization assays, signaling immunoblots, and xenograft models in TNBC cells\",\n      \"pmids\": [\"35681787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Apparent contradiction with earlier finding that SCAMP3 depletion accelerates degradation (2009) versus stabilizes EGFR here — context dependence not resolved\",\n        \"Single lab study in one cancer line\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"SCAMP3 was found to associate with insulin secretory granules in β-cells, and its depletion reduced insulin content and glucose-stimulated insulin secretion, extending SCAMP3's granule-related functions beyond endosomal sorting to regulated secretion.\",\n      \"evidence\": \"ISG isolation with mass spectrometry proteomics, confocal colocalization, siRNA knockdown in INS-1 cells with insulin content and secretion assays\",\n      \"pmids\": [\"39320956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which SCAMP3 supports ISG biogenesis or exocytosis not elucidated\",\n        \"Not tested whether ESCRT or ubiquitin motifs of SCAMP3 are required for ISG function\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"SCAMP3 was shown to be essential for neutrophil granule biogenesis across two independent model systems (mouse Hoxb8 cells and zebrafish), with knockout reducing primary, secondary, and tertiary granule proteins and impairing degranulation and bacterial killing.\",\n      \"evidence\": \"CRISPR knockout in Hoxb8-derived neutrophils and genetic disruption in zebrafish, mass spectrometry, degranulation and E. coli killing assays\",\n      \"pmids\": [\"41187789\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether SCAMP3 acts at the Golgi during granule maturation or at the endosome–granule interface is unknown\",\n        \"Relevant SCAMP3 motifs (PSAP, PY, ubiquitylation sites) not tested in neutrophil context\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"SCAMP3 was identified as a recruiter of the lipid transfer protein BLTP2 to ER–MVB membrane contact sites in a Rab5-dependent manner, with NEDD4-mediated ubiquitination of SCAMP3 antagonizing this recruitment; this contact facilitates BMP/LBPA precursor transfer to MVBs for ILV and exosome formation.\",\n      \"evidence\": \"(preprint) Co-immunoprecipitation, proximity ligation, BLTP2/SCAMP3 depletion, lipid profiling by mass spectrometry, exosome quantification, rescue experiments\",\n      \"pmids\": [\"bio_10.1101_2025.04.17.649455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint not yet peer-reviewed\",\n        \"Direct visualization of ER–MVB contacts dependent on SCAMP3 not yet shown by electron microscopy\",\n        \"Whether this lipid transfer mechanism operates in cell types beyond HeLa is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include how SCAMP3's ESCRT-interacting, ubiquitin, and phosphorylation-dependent functions are coordinated across its diverse cellular roles (EGFR sorting, granule biogenesis, ER–MVB contacts, insulin secretion), and whether a unified trafficking mechanism underlies all these phenotypes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of full-length SCAMP3 or its complexes exists\",\n        \"Relative contributions of PSAP, PY, and Y86 motifs in non-EGFR contexts are untested\",\n        \"In vivo loss-of-function phenotype in a complete mammalian knockout model not reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 5, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2, 4, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 4, 7, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"EGFR\",\n      \"TSG101\",\n      \"HRS\",\n      \"NEDD4\",\n      \"BLTP2\",\n      \"EPS8\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SCAMP3 is a multi-ubiquitylated transmembrane protein of post-Golgi vesicles and early endosomes that orchestrates receptor trafficking, multivesicular body (MVB) biogenesis, and regulated secretory granule formation across multiple cell types. It interacts with ESCRT machinery (Tsg101 via its PSAP motif, Hrs) and Nedd4 ubiquitin ligases (via its PY motif) to regulate EGFR sorting into MVBs and intralumenal vesicle formation, and is itself phosphorylated at Y86 by EGFR, a modification required for its pro-degradative and tumor-suppressive functions in lung adenocarcinoma [PMID:9658162, PMID:19158374, PMID:21951651, PMID:33850265]. Beyond EGFR trafficking, SCAMP3 is essential for neutrophil granule biogenesis and degranulation, regulates insulin granule content and secretion in pancreatic β-cells, and recruits the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5-dependent manner to supply phospholipid precursors for ILV/exosome formation [PMID:41187789, PMID:39320956]. In cancer contexts, SCAMP3 modulates ERK/AKT/STAT3 signaling downstream of EGFR and influences autophagic flux, with its loss disrupting mTORC1 signaling and SQSTM1/p62 turnover [PMID:35681787, PMID:41096842].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that SCAMP3 is a direct EGFR substrate answered the question of whether secretory carrier-associated membrane proteins participate in receptor tyrosine kinase signaling, linking SCAMP3 to EGF-stimulated trafficking.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro kinase assay with recombinant EGFR, vanadate treatment, and PTP1B dephosphorylation in murine fibroblasts overexpressing EGFR\",\n      \"pmids\": [\"9658162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation site not mapped in this study\", \"Functional consequence of phosphorylation on trafficking not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that SCAMP3 interacts with ESCRT components (Tsg101, Hrs) and Nedd4 via defined motifs, and that its depletion accelerates EGFR degradation while inhibiting recycling, established SCAMP3 as a regulator of endosomal receptor sorting acting in parallel with the canonical ESCRT pathway.\",\n      \"evidence\": \"siRNA knockdown, domain mutagenesis (PY, PSAP, lysine mutants), co-immunoprecipitation, immunoelectron microscopy, and quantitative degradation/recycling assays in HeLa cells\",\n      \"pmids\": [\"19158374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SCAMP3 acts catalytically or as a scaffold is unclear\", \"Structural basis of SCAMP3-ESCRT interactions not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"In vitro reconstitution of MVB biogenesis showed SCAMP3 promotes intralumenal vesicle formation, moving the protein's role beyond receptor recycling to active participation in MVB/ILV generation.\",\n      \"evidence\": \"Cell-free MVB biogenesis assay combined with siRNA knockdown and EGFR sorting readouts\",\n      \"pmids\": [\"21951651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lipid requirements for SCAMP3-dependent ILV formation not defined\", \"Mechanism by which SCAMP3 promotes membrane budding not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of Y86 as the critical EGFR-dependent phosphorylation site on SCAMP3, and demonstration that Y86F mutation abolishes tumor-suppressive function in lung adenocarcinoma xenografts, established the mechanistic link between EGFR phosphorylation and SCAMP3's pro-degradative activity.\",\n      \"evidence\": \"Quantitative phosphoproteomics, Y86F mutagenesis rescue, co-immunoprecipitation, and xenograft models\",\n      \"pmids\": [\"33850265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Y86 phosphorylation alters SCAMP3's affinity for ESCRT components specifically is untested\", \"Relevance of Y86 outside lung adenocarcinoma not explored\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CRISPR knockout of SCAMP3 in triple-negative breast cancer cells revealed that SCAMP3 is required for efficient EGFR degradation and modulates AKT/ERK/STAT3 signaling, extending its oncogenic relevance beyond lung to breast cancer and clarifying its context-dependent pro- versus anti-tumorigenic roles.\",\n      \"evidence\": \"CRISPR knockout, EGFR internalization/degradation assays, immunoblots, xenograft models in TNBC cells\",\n      \"pmids\": [\"35681787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direction of SCAMP3's role (tumor-suppressive vs. oncogenic) appears context-dependent and unresolved\", \"Single-lab study without independent replication\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of SCAMP3 as an insulin secretory granule-associated protein that controls insulin content and secretion established a role for SCAMP3 in regulated exocytosis beyond the endolysosomal system.\",\n      \"evidence\": \"Protein correlation profiling mass spectrometry on isolated ISGs from MIN6 and human β-cells, confocal colocalization, siRNA knockdown with insulin secretion assay in INS-1 cells\",\n      \"pmids\": [\"39320956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which SCAMP3 maintains insulin granule content unknown\", \"Not yet confirmed in primary human islets\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Knockout studies in mammalian neutrophil-like cells and zebrafish demonstrated that SCAMP3 is essential for formation and content of all three neutrophil granule classes and for degranulation-dependent bacterial killing, broadening its role to innate immune defense.\",\n      \"evidence\": \"Scamp3 KO in Hoxb8 cells and zebrafish, mass spectrometry, degranulation assay, E. coli killing assay, in vivo zebrafish infection\",\n      \"pmids\": [\"41187789\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SCAMP3 acts during granule biogenesis at the TGN or in granule maturation is unresolved\", \"Molecular mechanism linking SCAMP3 to granule protein retention not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Phosphoproteomics of SCAMP3-KO TNBC cells under ERK inhibition revealed that SCAMP3 sustains residual ERK activity and mTORC1 signaling and that its loss disrupts autophagic flux, mechanistically connecting SCAMP3 to MAPK feedback regulation and autophagy.\",\n      \"evidence\": \"TMT-based phosphoproteomics of WT vs SCAMP3-KO MDA-MB-231 cells ± EGF ± MK-8353, immunoblotting\",\n      \"pmids\": [\"41096842\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SCAMP3 directly affects ERK feedback or acts indirectly via receptor trafficking is unclear\", \"Autophagy disruption could be secondary to endosomal dysfunction\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"SCAMP3 was shown to recruit the lipid transfer protein BLTP2 to ER–MVB contact sites in a Rab5-dependent manner, with NEDD4-mediated ubiquitination of SCAMP3 antagonizing this recruitment, providing a mechanistic explanation for how SCAMP3 supplies phospholipid precursors (PG, BMP/LBPA) for ILV/exosome biogenesis.\",\n      \"evidence\": \"(preprint) Co-immunoprecipitation, proximity ligation, BLTP2 KO, lipidomics, exosome quantification, Rab5 dominant-negative experiments\",\n      \"pmids\": [\"bio_10.1101_2025.04.17.649455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Not yet peer-reviewed\", \"Whether SCAMP3–BLTP2 axis operates in non-endosomal granule contexts is untested\", \"Direct lipid transfer activity of the SCAMP3–BLTP2 complex not reconstituted in vitro\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis for SCAMP3's interactions with ESCRT components and BLTP2, the molecular basis for its context-dependent pro- versus anti-tumorigenic roles across cancer types, and whether its granule biogenesis function in neutrophils and β-cells shares a common trafficking mechanism with its endosomal role.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No atomic-resolution structure of SCAMP3 or its complexes\", \"No in vivo mammalian knockout phenotype reported\", \"Unified model reconciling EGFR recycling/degradation roles with granule biogenesis roles is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 3, 11]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 2, 8]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 3, 8, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 6, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"EGFR\",\n      \"TSG101\",\n      \"NEDD4\",\n      \"HRS\",\n      \"BLTP2\",\n      \"EPS8\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}