{"gene":"VAMP8","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2000,"finding":"Syntaxin 7 localizes to late endosomes/lysosomes and associates with VAMP8 (Vamp 8) by co-immunoprecipitation; syntaxin 7 is specifically required for fusion of late endosomes with lysosomes in vitro, identifying a SNARE complex (syntaxin 7 / VAMP8) that functions in the late endocytic pathway.","method":"Co-immunoprecipitation, cell-free in vitro fusion assay, immunolocalization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reciprocal Co-IP plus functional in vitro reconstitution assay demonstrating requirement for syntaxin 7/VAMP8 complex in late endosome–lysosome fusion","pmids":["10982406"],"is_preprint":false},{"year":2001,"finding":"In B16 melanoma cells, immunoaffinity purification of syntaxin 7 co-isolated VAMP8 and VAMP7 among other SNARE partners (syntaxin 6, mVti1b, αSNAP), suggesting that syntaxin 7/mVti1b/syntaxin 6 can form discrete complexes with either VAMP7 or VAMP8 to regulate late endosomal fusion events.","method":"Large-scale immunoaffinity purification, electrospray mass spectrometry, immunoblotting, co-immunoprecipitation, confocal colocalization","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoaffinity MS identification plus co-IP, single lab, no reconstitution","pmids":["11278762"],"is_preprint":false},{"year":2004,"finding":"In antibody-inhibition experiments using rat liver cell-free systems, the Q-SNARE complex of syntaxin 7/Vti1b/syntaxin 8 plus VAMP8 mediates homotypic late-endosome fusion, while the same Q-SNAREs combine with VAMP7 for heterotypic late-endosome–lysosome fusion; separate co-immunoprecipitation confirmed distinct syntaxin 7 complexes with VAMP7 vs. VAMP8 in solubilized liver membranes.","method":"Antibody inhibition in cell-free fusion assay, co-immunoprecipitation, overexpression of VAMP7 N-terminal domain to inhibit heterotypic fusion","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — cell-free reconstitution with antibody inhibition plus reciprocal Co-IP, defining combinatorial SNARE specificity","pmids":["15133481"],"is_preprint":false},{"year":2004,"finding":"VAMP8 is enriched on zymogen granule membranes in pancreatic acinar cells and forms a SNARE complex with syntaxin 4 and SNAP-23. VAMP8-knockout mice accumulate zymogen granules (~3-fold) and show abolished secretagogue-stimulated exocytosis from acinar cells, establishing VAMP8 as the major v-SNARE for regulated exocytosis in exocrine pancreas.","method":"Targeted gene knockout in mice, immunohistochemistry, co-immunoprecipitation, secretion assay from pancreatic fragments","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with defined exocytotic phenotype plus Co-IP identification of SNARE complex, replicated across multiple readouts","pmids":["15363411"],"is_preprint":false},{"year":2006,"finding":"VAMP8 (endobrevin) is the primary v-SNARE for platelet dense-core granule, alpha-granule, and lysosome release; VAMP8-/- mouse platelets show significant agonist-induced secretion defects, while VAMP-2+/-, VAMP-3-/-, and VAMP-2+/-/VAMP-3-/- platelets show no defect. Tetanus toxin (cleaving VAMP-2/-3) blocks residual release in VAMP-8-/- platelets, revealing a secondary role for VAMP-2/-3.","method":"Genetic knockout (VAMP-8-/-, VAMP-2+/-, VAMP-3-/-) platelet secretion assays, tetanus toxin treatment of permeabilized platelets","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic KO models with specific secretion readouts, tetanus toxin orthogonal approach, strong mechanistic resolution","pmids":["17065550"],"is_preprint":false},{"year":2002,"finding":"VAMP-3 and VAMP-8 (but not VAMP-1 or VAMP-2) are identified in human platelets by mass spectrometry co-immunoprecipitated with syntaxin 4; recombinant VAMP-8 added to permeabilized platelets inhibits dense-granule secretion but not alpha-granule secretion, while rVAMP-3 inhibits both, demonstrating isoform-specific roles in platelet exocytosis.","method":"Nano-ESI tandem MS, immunoblotting, co-immunoprecipitation with syntaxin 4, competitive inhibition assay with recombinant VAMPs in permeabilized platelets","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification plus functional competition assay with recombinant proteins in permeabilized cells","pmids":["12130530"],"is_preprint":false},{"year":2007,"finding":"VAMP8 is expressed in all examined exocrine tissues (salivary, lacrimal, sweat, sebaceous, mammary glands, prostate). VAMP8-null mice show severe secretory granule accumulation and impaired pilocarpine-stimulated secretion in salivary and lacrimal glands; VAMP8 co-immunoprecipitates with syntaxin 4 and SNAP-23, establishing it as a general v-SNARE for regulated exocrine secretion.","method":"VAMP8-null mouse phenotyping, immunohistochemistry, electron microscopy, stimulated secretion assay, co-immunoprecipitation","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple exocrine tissue phenotypes, stimulated secretion assay, and Co-IP identification of SNARE complex","pmids":["17215514"],"is_preprint":false},{"year":2007,"finding":"In permeabilized rat basophilic leukaemia cells, recombinant VAMP8/endobrevin (but not other R-SNAREs tested) specifically blocks hexosaminidase exocytosis; this secretion is insensitive to clostridial neurotoxins, consistent with VAMP8 serving as the primary R-SNARE for mast cell granule exocytosis.","method":"Permeabilized cell exocytosis inhibition assay with complete set of recombinant mammalian R-SNAREs, hexosaminidase release assay, clostridial neurotoxin treatment","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution-type competition assay with full R-SNARE panel, single lab","pmids":["17618625"],"is_preprint":false},{"year":2008,"finding":"In bone marrow-derived mast cells, VAMP-8 co-localizes with secretory granules and redistributes upon stimulation, forming increased SNARE complexes with SNAP-23 and syntaxin-4. VAMP-8-deficient BMMCs show markedly reduced degranulation after IgE/antigen, thapsigargin, or ionomycin stimulation; plasma histamine is reduced in passive systemic anaphylaxis in VAMP-8-/- mice. Cytokine/chemokine release is not affected, while unprocessed TNF accumulates at the plasma membrane in a VAMP-3-positive compartment, demonstrating that VAMP-8 segregates granule exocytosis from cytokine trafficking.","method":"VAMP-8 KO mice, bone marrow-derived mast cell degranulation assays, confocal microscopy, SNARE complex immunoprecipitation, passive systemic anaphylaxis model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple in vitro and in vivo secretion readouts, Co-IP demonstrating SNARE complex formation, single lab but multiple orthogonal methods","pmids":["18203950"],"is_preprint":false},{"year":2008,"finding":"VAMP8 is the zymogen granule SNARE mediating basolateral exocytosis in alcoholic pancreatitis; ethanol exposure redirects apical to basolateral exocytosis in WT acini, but VAMP8-/- mice show blockade of both apical and basolateral exocytosis. Electron microscopy revealed reduced ZG-ZG homotypic fusions in VAMP8-/- acinar cells, establishing VAMP8 as critical for ZG-ZG fusion and basolateral secretion.","method":"VAMP8-/- mice, in vitro ethanol exposure + carbachol stimulation, amylase secretion assay, electron microscopy of ZG-ZG fusions","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined secretion phenotype plus ultrastructural (EM) evidence for ZG-ZG fusion defect","pmids":["18535671"],"is_preprint":false},{"year":2008,"finding":"In mature human intestinal mast cells, VAMP-7 and VAMP-8 translocate to the plasma membrane and interact with SNAP-23 and STX-4 upon activation; inhibition of VAMP-7 or VAMP-8 (but not VAMP-2 or VAMP-3) markedly reduces IgE receptor-mediated histamine release, defining VAMP-7 and VAMP-8 as the required v-SNAREs for human mast cell degranulation.","method":"Primary human mast cell isolation, VAMP peptide inhibition, SNAP-23/STX-4 co-immunoprecipitation, histamine release assay","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional inhibition assay in primary human cells, single lab","pmids":["18253931"],"is_preprint":false},{"year":2009,"finding":"VAMP8 is localized to CTL lytic granules; VAMP8-/- CTL show normal immunological synapse formation and granule polarization but significantly reduced granzyme A and granzyme B secretion, establishing VAMP8 as a v-SNARE required for lytic granule fusion with the plasma membrane during CTL-mediated killing.","method":"VAMP8-/- mice, CTL cytotoxicity assay, granzyme secretion assay, immunofluorescence colocalization","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with specific lytic granule secretion readout, granule polarization shown to be normal (ruling out upstream defect)","pmids":["19830729"],"is_preprint":false},{"year":2009,"finding":"VAMP8 localizes to secretory granules in macrophages and mediates TNF-alpha release; TNF-alpha co-localizes with VAMP8-positive vesicles in WT macrophages, while VAMP8-/- macrophages show inhibited TNF-alpha secretion and reduced degranulation. VAMP8-/- mice are protected from C5a-induced neutropenia, peritonitis, and systemic inflammation.","method":"VAMP8-/- mice, macrophage degranulation assay, TNF-alpha ELISA, confocal colocalization, in vivo peritonitis model","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with in vitro and in vivo secretion phenotypes and colocalization demonstrating VAMP8-positive TNF-alpha vesicles","pmids":["19564343"],"is_preprint":false},{"year":2010,"finding":"VAMP8 depletion in mice causes hydronephrosis and a 3–5-fold increase in aquaporin 2 (AQP2) levels; vasopressin/forskolin-induced AQP2 exocytosis is impaired in VAMP8-null collecting duct cells. VAMP8 co-localizes with AQP2 on intracellular vesicles and interacts with syntaxin 4 and syntaxin 3 t-SNAREs, establishing a role in regulated AQP2 trafficking to the plasma membrane.","method":"VAMP8-null mice, immunofluorescence colocalization, exocytosis assay in collecting duct cells, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with specific phenotype, colocalization, and Co-IP identifying SNARE partners for AQP2 vesicle fusion","pmids":["19841070"],"is_preprint":false},{"year":2010,"finding":"Knockdown of Vti1b and VAMP8 with siRNA disturbs autophagosome-lysosome fusion (LC3/LAMP1 colocalization reduced) without affecting bacterial invasion efficiency, but impairs cellular bactericidal efficiency in xenophagy (Group A Streptococcus). The same SNARE pair (VAMP8 + Vti1b) is required for canonical autophagosome-lysosome fusion; knockdown of syntaxin 7 or syntaxin 8 had little effect on autophagic fusion.","method":"siRNA knockdown, confocal microscopy for LC3/LAMP1 colocalization, bacterial survival assay, canonical autophagy LC3-II degradation assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA loss-of-function with multiple functional readouts (xenophagy and canonical autophagy), negative controls for non-relevant SNAREs","pmids":["20089838"],"is_preprint":false},{"year":2010,"finding":"In VAMP8-null mice, sarcolemmal GLUT4 levels are increased in both basal and insulin-stimulated states without change in total GLUT4, indicating VAMP8 is required for endocytosis of the insulin-responsive GLUT4 transporter. VAMP8-null mice display fasting hypoglycemia, enhanced glucose tolerance, and increased skeletal muscle glucose uptake.","method":"VAMP8-null mice, euglycemic-hyperinsulinemic clamp with radiotracer glucose uptake, immunofluorescence microscopy for sarcolemmal GLUT4","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with quantitative in vivo glucose clamp and surface GLUT4 imaging, single lab","pmids":["20876717"],"is_preprint":false},{"year":2010,"finding":"Vti1b-deficient and Vamp8-deficient CTL show significantly reduced degranulation (CD107a surface exposure) and ~50% reduced cytotoxic activity after 3 days of antigen-specific stimulation; by day 4, cytotoxic activity is no longer impaired, suggesting a compensable role for both SNARE proteins in lytic granule exocytosis during early CTL development.","method":"Vti1b-KO and Vamp8-KO TCR-transgenic OT-I mice, CD107a degranulation assay, cytolytic activity assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with specific degranulation and cytotoxicity readouts, single lab; compensability limits mechanistic specificity","pmids":["20543108"],"is_preprint":false},{"year":2011,"finding":"VAMP8 is specifically required for sequential (granule-to-granule) compound exocytosis in pancreatic acinar cells. Using an assay distinguishing primary (granule-plasma membrane) from secondary (granule-granule) fusion events, VAMP8-KO acinar cells show specific reduction in secondary granule fusion but not primary fusion. Immunoprecipitation shows syntaxin 3 associates with VAMP8 for granule-granule fusion, while syntaxin 2 associates with VAMP2 for primary fusion.","method":"VAMP8-KO mice, two-photon live-cell imaging distinguishing primary vs. secondary fusion events, immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — novel assay discriminating fusion event types in KO acinar cells plus Co-IP identifying distinct SNARE complex compositions","pmids":["21733851"],"is_preprint":false},{"year":2011,"finding":"VAMP8 localizes predominantly to goblet cell mucin granules in human airway epithelium; siRNA/shRNA knockdown of VAMP8 reduces mucin secretion stimulated by PAR agonists, neutrophil elastase, and ATP, as well as basal secretion. VAMP8-KO mice with IL-13-induced mucous metaplasia show reduced mucin in bronchoalveolar lavage. Knockdown of VAMP2 or VAMP3 does not affect mucin secretion.","method":"VAMP8 siRNA/shRNA knockdown in airway epithelial cell cultures, mucin secretion assay, VAMP8-KO mice with mucous metaplasia model, immunolocalization","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA/shRNA in human cells plus genetic KO in mice with specific secretion readouts and negative controls for VAMP2/3","pmids":["22144578"],"is_preprint":false},{"year":2012,"finding":"VAMP8-null mice show impaired insulin granule recruitment to the plasma membrane contributing to reduced GLP-1 potentiation of glucose-stimulated insulin secretion; however, VAMP8-null mice also display increased islet β cell mass from enhanced β cell mitosis, amplified by GLP-1, demonstrating a dual role of VAMP8 in insulin granule exocytosis and islet β cell growth.","method":"VAMP8-null mice, glucose-stimulated insulin secretion assay, islet morphometry, β cell proliferation assay, GLP-1 treatment","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with multiple in vitro and in vivo secretion and proliferation readouts, single lab","pmids":["22841572"],"is_preprint":false},{"year":2013,"finding":"The Leishmania surface metalloprotease GP63 cleaves VAMP8 (among other SNAREs) on phagosomes. GP63-mediated VAMP8 inactivation (or Vamp8 gene disruption) prevents NADPH oxidase (NOX2) complex assembly on phagosomes, altering phagosomal pH and degradative properties, and inhibiting MHC class I cross-presentation of Leishmania antigens, thereby reducing T cell activation.","method":"GP63 cleavage of VAMP8 (biochemical), Vamp8 KO cells/mice, phagosomal NOX2 assembly assay, phagosomal pH measurement, MHC class I cross-presentation assay, T cell activation assay","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical cleavage assay plus genetic KO with multiple orthogonal functional readouts (NOX2 assembly, pH, cross-presentation, T cell activation)","pmids":["23870310"],"is_preprint":false},{"year":2015,"finding":"In primary human CTLs, VAMP8 co-localizes with Rab11a-positive recycling endosomes (not cytotoxic granules). Upon stimulation, VAMP8-positive recycling endosomes traffic to and fuse with the plasma membrane at immune synapses before cytotoxic granule fusion. VAMP8 knockdown blocks both recycling endosome and cytotoxic granule fusion. Mechanistically, VAMP8-dependent recycling endosome fusion deposits syntaxin-11 at immune synapses to facilitate assembly of plasma membrane SNARE complexes required for cytotoxic granule exocytosis.","method":"Confocal and TIRF microscopy in primary human CTLs, VAMP8 siRNA knockdown, live-cell imaging of vesicle fusion kinetics, syntaxin-11 localization assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — live TIRF imaging plus knockdown with specific sequential fusion readouts and syntaxin-11 mechanistic link, primary human cells","pmids":["26124288"],"is_preprint":false},{"year":2015,"finding":"Starvation induces Sbf/MTMR13 GEF activity and RAB21 activation, which promotes MTMR13 and RAB21 binding to VAMP8, facilitating endolysosomal trafficking of VAMP8 to lysosomes required for autophagosome-lysosome fusion. Depletion of Sbf/MTMR13 or Rab21 blocks VAMP8 endolysosomal delivery and impairs starvation-induced autophagy.","method":"Drosophila and mammalian cell depletion experiments, Rab21 GEF activity assay, co-immunoprecipitation of MTMR13/RAB21 with VAMP8, autophagy flux assay, endolysosomal trafficking assay","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus GEF activity assay and knockdown with autophagy readouts, single lab","pmids":["25648148"],"is_preprint":false},{"year":2017,"finding":"VAMP8 mediates NOX2 trafficking not only to phagosomes but also to endosomes in both human and mouse dendritic cells. Absence of VAMP8 leads to decreased ROS production, reduced lipid peroxidation, impaired antigen translocation to cytosol, and impaired cross-presentation; VAMP8 knockdown did not affect MHC class I or TAP1 recruitment to phagosomes.","method":"VAMP8 knockdown in human and mouse DCs, NOX2 recruitment assay, ROS measurement, lipid peroxidation assay, antigen translocation and cross-presentation assay","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown in primary cells with multiple orthogonal mechanistic readouts, single lab","pmids":["28688576"],"is_preprint":false},{"year":2017,"finding":"APOL1 protein interacts with VAMP8 in podocytes; this interaction was confirmed by co-immunoprecipitation and surface plasmon resonance. APOL1 disease-associated variants attenuate this interaction. Molecular dynamics simulations and circular dichroism spectroscopy reveal that variant APOL1 has increased C-terminal conformational stability (a more closed/autoinhibited state), reducing interaction with VAMP8-coated vesicles.","method":"Co-immunoprecipitation, surface plasmon resonance, molecular dynamics simulation, circular dichroism spectroscopy, structural homology search","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — SPR (biophysical binding assay) plus Co-IP and computational structural analysis, single lab","pmids":["28724794"],"is_preprint":false},{"year":2017,"finding":"VAMP8 is present on mucin granules in intestinal goblet cells and is specifically activated during Entamoeba histolytica infection to coordinate mucin exocytosis; ablation of VAMP8 impairs mucin secretion, increases E. histolytica adherence and epithelial cell apoptosis, and triggers a proinflammatory response (IL-1α, IL-1β, TNF-α).","method":"VAMP8 siRNA knockdown in human goblet cells, Vamp8-/- mice, E. histolytica infection model, mucin secretion assay, apoptosis assay, cytokine measurement","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA plus genetic KO mice with multiple functional readouts (mucin secretion, infection outcome, inflammation), single lab","pmids":["28974617"],"is_preprint":false},{"year":2017,"finding":"VAMP8 knockdown reduced JAK1 and STAT1 phosphorylation and impaired induction of interferon-stimulated genes (ISGs) following West Nile virus infection or IFN-β treatment; VAMP8-mediated STAT1 phosphorylation required presence of TRIM6, identifying VAMP8 as a novel regulator of type I interferon signaling downstream of TRIM6.","method":"VAMP8 siRNA knockdown in human cells, phospho-JAK1/STAT1 western blotting, ISG induction assay, next-generation sequencing identification of VAMP8","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with signaling pathway readouts and TRIM6 epistasis, single lab","pmids":["31694946"],"is_preprint":false},{"year":2018,"finding":"VAMP8 interacts with the metastasis suppressor GTPase RAB37; confocal and TIRF microscopy show VAMP8 co-localizes with RAB37 and facilitates trafficking of RAB37-TIMP1 vesicles. VAMP8 is required for RAB37-regulated exocytosis of TIMP1 to suppress lung cancer metastasis, demonstrated by tail-vein injection reconstitution experiments.","method":"Co-immunoprecipitation, confocal and TIRF microscopy, exocytosis/secretion assay for TIMP1, tail-vein injection metastasis model, lung-to-lung metastasis reconstitution","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus live imaging and in vivo reconstitution, single lab","pmids":["30165196"],"is_preprint":false},{"year":2019,"finding":"VAMP8 coordinates MUC2 mucin exocytosis from colonic goblet cells; Vamp8-/- mice exhibit altered mucus layer, increased encounters with microbial antigens, shift to detrimental microbiota, mild basal pro-inflammatory state, and high susceptibility to chemical and infectious colitis, demonstrating essential role of VAMP8 in intestinal homeostasis via mucus exocytosis.","method":"Vamp8-/- mice, mucin secretion assay, intestinal microbiota analysis, colitis models (chemical and infectious), immunology assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in mice with multiple in vivo phenotypes and mechanistic link to mucin exocytosis, single lab","pmids":["31541089"],"is_preprint":false},{"year":2019,"finding":"Defective AP-3-dependent trafficking in Hermansky-Pudlak Syndrome type 2 (HPS2) endothelial cells depletes VAMP8 from Weibel-Palade bodies; CRISPR-Cas9-engineered VAMP8-/- endothelial cells show impaired stimulus-induced von Willebrand factor secretion, establishing VAMP8 as an AP-3-dependent SNARE required for Weibel-Palade body exocytosis.","method":"Patient-derived blood outgrowth endothelial cells, CRISPR-Cas9 KO of VAMP8, proteome analysis, von Willebrand factor secretion assay","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with specific secretion phenotype plus proteomics identifying trafficking pathway, single lab","pmids":["30630984"],"is_preprint":false},{"year":2021,"finding":"mTORC1 directly phosphorylates VAMP8, inhibiting formation of the STX17-SNAP29-VAMP8 SNARE complex and thereby blocking autophagosome-lysosome fusion. A VAMP8 phosphorylation mimic mutant fails to promote autophagosome-lysosome fusion in vitro. Dephosphorylated VAMP8 promotes recruitment of SCFD1 (Sec1/Munc18-like protein) to autolysosomes; phosphorylated VAMP8 or SCFD1 depletion inhibits fusion. Expression of phosphomimic VAMP8 in mouse liver increases lipid droplet accumulation.","method":"mTORC1 kinase assay (phosphorylation), in vitro fusion assay with phosphomimic VAMP8, SCFD1 localization assay, Co-IP for SNARE complex, liver lipid droplet assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay plus in vitro fusion reconstitution with mutants, SCFD1 localization assay, and in vivo liver phenotype","pmids":["34785650"],"is_preprint":false},{"year":2021,"finding":"VAMP8 on lysosomes assists in forming prefusion clusters of multiple lysosomes around individual autophagosomes upon stimulation. A VAMP8 phosphorylation mimic reduces fusion in a lipid-mixing ensemble assay and increases unfused lysosomes associated with autophagosomes, suggesting phosphorylation minimizes spontaneous autophagosome-lysosome fusion under normal conditions while pre-assembling lysosomes for stimulated autophagy.","method":"Structured illumination microscopy, ensemble lipid-mixing fusion assay, VAMP8 phosphorylation mimic mutation","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro lipid-mixing assay plus structured illumination imaging with phosphomimic, single lab","pmids":["34645799"],"is_preprint":false},{"year":2023,"finding":"NRF2 transcriptionally maintains VAMP8 expression; NRF2-knockout cells have low VAMP8, which blocks autophagosome-lysosome fusion (ferritinophagy), leading to apoferritin accumulation in autophagosomes and an elevated labile iron pool, enhancing sensitivity to ferroptosis.","method":"NRF2 knockout cells, VAMP8 protein/mRNA measurement, LC3/LAMP1 colocalization assay, ferritin/NCOA4 immunoblotting, ferroptosis assay","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO cells with VAMP8 expression and autophagosome fusion readouts linking NRF2-VAMP8 axis to iron homeostasis, single lab","pmids":["36724221"],"is_preprint":false},{"year":2024,"finding":"DRAM1 physically interacts with VAMP8 on lysosomes; this interaction is enhanced upon autophagy stimulation. DRAM1 preferentially promotes autophagosome-lysosome fusion by enhancing assembly of the STX17-SNAP29-VAMP8 complex. DRAM1 stabilizes lysosomal VAMP8 by inhibiting CHIP-mediated ubiquitination of VAMP8 at Lys68, 72, and 75, competitively binding CHIP.","method":"Co-immunoprecipitation, STX17-SNAP29-VAMP8 complex assembly assay, ubiquitination assay, CHIP-VAMP8 binding competition, site-directed mutagenesis of Lys68/72/75, autophagy flux assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP with complex assembly assay, ubiquitination mapping with site-specific mutagenesis, and competitive binding assay, multiple orthogonal methods","pmids":["40595569"],"is_preprint":false},{"year":2007,"finding":"Salmonella SopB-generated PtdIns(3)P directly binds VAMP8/endobrevin and recruits it to Salmonella-induced macropinosomes in a nocodazole-dependent, Brefeldin A-independent manner; knockdown of VAMP8 or expression of truncated VAMP8 (1-79aa) reduces Salmonella invasion efficiency to the level of SopB phosphatase-dead mutant, demonstrating that bacteria exploit VAMP8 and PtdIns(3)P binding to promote phagocytosis.","method":"PtdIns(3)P–VAMP8 direct binding assay, VAMP8 siRNA knockdown, confocal colocalization, pharmacological inhibitors (wortmannin, nocodazole, Brefeldin A), bacterial invasion assay","journal":"Traffic","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct lipid-binding assay plus siRNA knockdown with invasion readout, single lab","pmids":["17645435"],"is_preprint":false},{"year":2014,"finding":"VAMP8-mediated ZG exocytosis depends on constitutive-like secretory pathway via early endosomal proteins Rab5/D52/EEA1; VAMP8-/- acini show >90% decrease in Rab5/D52/EEA1 and increased Rab11a/TI-VAMP7 on ZGs. GDP-trapped Rab11a-S25N specifically inhibits the VAMP8 but not VAMP2 secretion pathway; rescue of Rab5/D52/EEA1 expression restores VAMP8-dependent secretion.","method":"VAMP8-/- acini, Rab11a dominant-negative expression, adenoviral D52/Rab5 rescue, perifusion secretion kinetics assay, confocal colocalization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus dominant-negative epistasis plus rescue experiment with specific secretion phase readout","pmids":["25138214"],"is_preprint":false},{"year":2018,"finding":"O-GlcNAc modification of SNAP29 inhibits formation of the SNAP29-STX17-VAMP8 SNARE complex; co-immunoprecipitation in diabetic rat cardiomyocytes showed that increased O-GlcNAc-SNAP29 disrupts STX17-VAMP8 complex assembly, blocking autophagic flux and exacerbating myocardial injury.","method":"Co-immunoprecipitation of SNAP29-STX17-VAMP8 complex, O-GlcNAc modification assay, STZ diabetic rat model, thiamet G and DON pharmacological tools, autophagy flux assay","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of SNARE complex under O-GlcNAc manipulation with autophagy flux readout, single lab","pmids":["30221662"],"is_preprint":false},{"year":2009,"finding":"In dendritic cells, caspases regulate VAMP-8 expression; VAMP-8 protein is a substrate of caspases, and treatment with caspase inhibitor upregulates VAMP-8. Consistent with VAMP-8's role in inhibiting phagocytosis in DCs, immature DCs treated with caspase inhibitor show lower phagocytosis activity.","method":"Caspase inhibitor treatment, VAMP-8 expression analysis, phagocytosis assay, identification of caspase cleavage sites on VAMP-8","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (pharmacological caspase inhibition) with expression and phagocytosis readout, no direct cleavage validation, single lab","pmids":["19607812"],"is_preprint":false},{"year":2020,"finding":"VAMP8 overexpression in neuronal cells (N2a) significantly increases tau secretion via late endosome-plasma membrane fusion, reducing intracellular tau levels; TIRF microscopy shows fusion of VAMP8-positive vesicles with plasma membrane correlates with cytoplasmic tau depletion. VAMP8 overexpression also reduces intracellular α-synuclein by increasing secretion.","method":"VAMP8 overexpression in N2a cells and murine hippocampal slices, intracellular/extracellular tau quantification, TIRF microscopy of VAMP8-positive vesicle fusion","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression with TIRF live imaging of fusion events correlated with tau depletion, single lab","pmids":["33454017"],"is_preprint":false},{"year":2022,"finding":"Oxidative stress inhibits endocytosis, decreasing lysosomal localization of VAMP8 and blocking autophagosome-lysosome fusion in human neuroblastoma cells; treatment with an endocytosis inhibitor recapitulates the VAMP8 lysosomal depletion and autophagy block, establishing that endocytic trafficking is required for VAMP8 delivery to lysosomes for autophagy.","method":"Oxidative stress induction, endocytosis inhibitor treatment, lysosomal VAMP8 localization assay (immunofluorescence), autophagosome-lysosome fusion assay","journal":"Biological & pharmaceutical bulletin","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological inhibition with localization and fusion readouts, no direct VAMP8 manipulation, single lab","pmids":["36328496"],"is_preprint":false},{"year":2023,"finding":"CENPN inhibits VAMP8 transcription by reducing phospho-CREB binding to the VAMP8 promoter; CENPN knockdown increases p-CREB nuclear translocation and VAMP8 expression, enhancing autophagic flux and paclitaxel sensitivity in nasopharyngeal carcinoma. Sequential knockdown of CENPN and VAMP8 reverses the PTX-sensitizing effect of CENPN knockdown, confirming VAMP8 as the mediator.","method":"ChIP assay for p-CREB binding to VAMP8 promoter, siRNA/shRNA knockdown, autophagy flux assay, nude mouse xenograft PTX sensitivity assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay for transcriptional regulation plus double-knockdown epistasis, single lab","pmids":["37776538"],"is_preprint":false},{"year":2023,"finding":"VAMP8 interacts with DDX5 in osteosarcoma cells; this interaction promotes DDX5 degradation via the ubiquitin-proteasome system, reducing β-catenin levels and suppressing EMT and metastasis. VAMP8 also promotes autophagy flux as a potential additional metastasis-suppressive mechanism.","method":"Co-immunoprecipitation of VAMP8-DDX5, ubiquitin-proteasome inhibitor experiments, β-catenin expression, EMT marker analysis, invasion/migration assays","journal":"Cancer biology & therapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP plus pharmacological UPS inhibition with limited mechanistic validation of ubiquitination, single lab","pmids":["37405957"],"is_preprint":false}],"current_model":"VAMP8 (endobrevin) is an R-SNARE that resides on late endosomal/lysosomal membranes and secretory granules, where it forms combinatorial SNARE complexes (with syntaxin 7/Vti1b/syntaxin 8 for late-endosome homotypic fusion; with syntaxin 4/SNAP-23 for regulated exocytosis; and with STX17/SNAP29 for autophagosome-lysosome fusion) to mediate membrane fusion events across multiple cell types—including pancreatic acinar, mast, platelet, goblet, and immune effector cells—while its activity is regulated post-translationally by mTORC1-dependent phosphorylation (which inhibits SNARE complex assembly and is countered by SCFD1 recruitment), CHIP-mediated ubiquitination (stabilized by DRAM1 interaction), and endocytic trafficking (Sbf/MTMR13-RAB21 pathway) that delivers VAMP8 to lysosomes for sustained autophagic flux."},"narrative":{"mechanistic_narrative":"VAMP8 (endobrevin) is an R-SNARE (v-SNARE) that drives membrane fusion across two broad functional domains: the late endocytic/autophagic pathway and regulated exocytosis from specialized secretory cells [PMID:10982406, PMID:15363411]. In the endolysosomal system, VAMP8 partners with the Q-SNARE complex syntaxin 7/Vti1b/syntaxin 8 to mediate homotypic late-endosome fusion, with VAMP7 substituting for heterotypic late-endosome–lysosome fusion, defining combinatorial SNARE specificity [PMID:10982406, PMID:15133481]. In autophagy, VAMP8 assembles with STX17 and SNAP29 to execute autophagosome-lysosome fusion, a step required for canonical autophagy and xenophagy [PMID:20089838, PMID:34785650]. In regulated secretion, VAMP8 forms complexes with syntaxin 4 and SNAP-23 (and syntaxin 3) to serve as the principal v-SNARE for stimulated exocytosis from a striking range of cell types: pancreatic acinar zymogen granules, where it specifically mediates granule-to-granule compound fusion [PMID:15363411, PMID:21733851]; platelet dense and alpha granules [PMID:17065550, PMID:12130530]; mast cell secretory granules [PMID:17618625, PMID:18203950]; cytotoxic lymphocyte lytic granules [PMID:19830729, PMID:26124288]; macrophage TNF-alpha granules [PMID:19564343]; goblet cell mucin granules [PMID:22144578, PMID:31541089]; endothelial Weibel-Palade bodies [PMID:30630984]; and AQP2- and GLUT4-containing vesicles in epithelial and metabolic tissues [PMID:19841070, PMID:20876717]. VAMP8 activity is post-translationally gated: mTORC1 phosphorylation blocks STX17-SNAP29-VAMP8 assembly and is countered by recruitment of the Sec1/Munc18 protein SCFD1 [PMID:34785650], while DRAM1 stabilizes lysosomal VAMP8 by competitively inhibiting CHIP-mediated ubiquitination at Lys68/72/75 [PMID:40595569]. Beyond fusion, VAMP8 traffics the NOX2 oxidase to phagosomes and endosomes to support reactive oxygen production and MHC class I cross-presentation, a function pathogens such as Leishmania subvert by GP63-mediated VAMP8 cleavage [PMID:23870310, PMID:28688576]. VAMP8-null mice exhibit accumulation of secretory granules and broad secretion defects across exocrine, immune, and metabolic tissues, with downstream consequences including intestinal mucus dysfunction and colitis susceptibility [PMID:15363411, PMID:31541089].","teleology":[{"year":2000,"claim":"Established VAMP8 as the v-SNARE partner for syntaxin 7 in the late endocytic pathway, answering which fusion machinery drives late endosome–lysosome traffic.","evidence":"Co-immunoprecipitation and cell-free in vitro fusion assay with immunolocalization","pmids":["10982406"],"confidence":"High","gaps":["Did not resolve full Q-SNARE composition","Homotypic vs heterotypic fusion roles not yet distinguished"]},{"year":2004,"claim":"Defined combinatorial SNARE specificity, showing VAMP8 with syntaxin 7/Vti1b/syntaxin 8 mediates homotypic late-endosome fusion while VAMP7 substitutes for heterotypic late-endosome–lysosome fusion.","evidence":"Antibody inhibition in cell-free fusion assay plus reciprocal Co-IP","pmids":["15133481","11278762"],"confidence":"High","gaps":["Quantitative kinetics of complex assembly not measured","Regulation of complex selection unknown"]},{"year":2004,"claim":"Identified VAMP8 as the major v-SNARE for regulated exocytosis, redirecting it from a purely endosomal role to a secretory granule fusion machine.","evidence":"Targeted gene knockout in mice with zymogen granule accumulation and abolished stimulated exocytosis, plus Co-IP of syntaxin 4/SNAP-23 complex","pmids":["15363411"],"confidence":"High","gaps":["Mechanism distinguishing exocytic from endosomal complex assembly unclear","Regulation of granule recruitment not addressed"]},{"year":2006,"claim":"Generalized VAMP8 as the primary R-SNARE for stimulated secretion across hematopoietic and immune effector cells, with VAMP2/3 as a minor backup.","evidence":"Multiple genetic KO platelet models, recombinant VAMP competition in permeabilized platelets and mast cells, clostridial neurotoxin treatment","pmids":["17065550","12130530","17618625","18203950"],"confidence":"High","gaps":["Granule-subtype selectivity (dense vs alpha) mechanism not fully resolved","Coupling to calcium-triggered fusion unaddressed"]},{"year":2009,"claim":"Extended VAMP8 to lytic granule and cytokine secretion in cytotoxic lymphocytes and macrophages, separating granule exocytosis from upstream polarization.","evidence":"VAMP8-KO CTL and macrophage secretion/cytotoxicity assays with normal granule polarization, in vivo inflammation models","pmids":["19830729","19564343","20543108"],"confidence":"High","gaps":["Compensability with Vti1b limits specificity","t-SNARE partners at the immune synapse not yet mapped"]},{"year":2010,"claim":"Placed VAMP8 at the autophagosome-lysosome fusion step, defining its role in autophagic flux and xenophagy.","evidence":"siRNA knockdown of VAMP8/Vti1b with LC3/LAMP1 colocalization, bactericidal and canonical autophagy assays, negative controls for syntaxin 7/8","pmids":["20089838"],"confidence":"High","gaps":["Q-SNARE partner for autophagic fusion not yet identified here","Regulation of VAMP8 delivery to autophagic membranes unknown"]},{"year":2011,"claim":"Distinguished VAMP8's specific role in granule-to-granule compound exocytosis versus primary granule-plasma membrane fusion, mapping distinct syntaxin partners.","evidence":"Two-photon live imaging of primary vs secondary fusion in VAMP8-KO acinar cells plus Co-IP of syntaxin 3 vs syntaxin 2/VAMP2","pmids":["21733851"],"confidence":"High","gaps":["Spatial control of compound vs primary fusion not resolved","How VAMP8 is partitioned between granule populations unknown"]},{"year":2010,"claim":"Broadened VAMP8 function to epithelial and metabolic vesicle trafficking, including AQP2 exocytosis and GLUT4 endocytosis.","evidence":"VAMP8-null mice with hydronephrosis/AQP2 accumulation, glucose clamp with surface GLUT4 imaging, Co-IP of syntaxin 3/4","pmids":["19841070","20876717"],"confidence":"High","gaps":["Directionality (exocytic vs endocytic) mechanism across tissues unclear","Whether the same SNARE complexes operate in endocytosis not established"]},{"year":2013,"claim":"Revealed a non-canonical VAMP8 function in delivering the NOX2 oxidase to phagosomes/endosomes for ROS production and cross-presentation, and showed pathogens cleave VAMP8 to subvert this.","evidence":"GP63 biochemical cleavage of VAMP8, Vamp8 KO cells with NOX2 assembly, phagosomal pH, cross-presentation and T cell activation assays; siRNA in dendritic cells","pmids":["23870310","28688576"],"confidence":"High","gaps":["Direct SNARE-independent vs fusion-dependent contribution to NOX2 delivery unresolved","Mechanism of NOX2 vesicle recruitment by VAMP8 unknown"]},{"year":2015,"claim":"Resolved post-translational and trafficking control of the autophagic VAMP8 pool, linking starvation signaling to lysosomal VAMP8 delivery.","evidence":"Sbf/MTMR13-RAB21 GEF and Co-IP assays in Drosophila and mammalian cells with autophagy flux readouts; sequential recycling-endosome fusion in CTLs by TIRF imaging","pmids":["25648148","26124288"],"confidence":"Medium","gaps":["Single-lab findings without reconstitution of the trafficking step","How RAB21 binding alters VAMP8 sorting structurally unknown"]},{"year":2021,"claim":"Defined mTORC1 phosphorylation as a master switch that inhibits STX17-SNAP29-VAMP8 assembly, with SCFD1 and prefusion lysosome clustering tuning stimulated autophagic fusion.","evidence":"In vitro mTORC1 kinase assay, phosphomimic VAMP8 in reconstituted fusion and lipid-mixing assays, SCFD1 localization, SIM imaging, in vivo liver lipid phenotype","pmids":["34785650","34645799"],"confidence":"High","gaps":["Phosphatase reversing VAMP8 phosphorylation not identified","Phosphosite-resolved structural mechanism of inhibited assembly incomplete"]},{"year":2024,"claim":"Established a stabilization circuit in which DRAM1 protects lysosomal VAMP8 from CHIP-mediated ubiquitination to promote autophagic SNARE assembly, complementing transcriptional control by NRF2, CREB/CENPN, and modification of SNAP29.","evidence":"Co-IP, complex assembly and ubiquitination assays with Lys68/72/75 mutagenesis and CHIP competition; NRF2-KO and CENPN ChIP/knockdown studies; O-GlcNAc SNAP29 Co-IP","pmids":["40595569","36724221","37776538","30221662"],"confidence":"High","gaps":["Integration of these parallel regulatory inputs in vivo not resolved","Deubiquitinase counteracting CHIP not identified"]},{"year":null,"claim":"How VAMP8 is partitioned and selectively recruited among its many membrane compartments (late endosomes, autophagosomes, and diverse secretory granules) to assemble the correct combinatorial SNARE complex remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of compartment-specific complex selection","Sorting determinants directing VAMP8 to distinct granule types unknown","Coordination of phosphorylation, ubiquitination, and trafficking inputs in a single cell not integrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,3,30]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[34]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,2,21]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,30,33,39]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[3,4,8,12,13,18,29]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[10,21,38]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[14,22,30,33]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,2,13,15]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,4,8,17,29]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,12,20,23]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[4,5,29]}],"complexes":["STX17-SNAP29-VAMP8 SNARE complex","syntaxin 7/Vti1b/syntaxin 8/VAMP8 late-endosome SNARE complex","syntaxin 4/SNAP-23/VAMP8 exocytic SNARE complex"],"partners":["STX7","VTI1B","STX8","STX4","SNAP23","STX17","SNAP29","SCFD1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BV40","full_name":"Vesicle-associated membrane protein 8","aliases":["Endobrevin","EDB"],"length_aa":100,"mass_kda":11.4,"function":"SNAREs, soluble N-ethylmaleimide-sensitive factor-attachment protein receptors, are essential proteins for fusion of cellular membranes. SNAREs localized on opposing membranes assemble to form a trans-SNARE complex, an extended, parallel four alpha-helical bundle that drives membrane fusion. VAMP8 is a SNARE involved in autophagy through the direct control of autophagosome membrane fusion with the lysososome membrane via its interaction with the STX17-SNAP29 binary t-SNARE complex (PubMed:23217709, PubMed:25686604). Also required for dense-granule secretion in platelets (PubMed:12130530). Also plays a role in regulated enzyme secretion in pancreatic acinar cells (By similarity). Involved in the abscission of the midbody during cell division, which leads to completely separate daughter cells (By similarity). Involved in the homotypic fusion of early and late endosomes (By similarity). Also participates in the activation of type I interferon antiviral response through a TRIM6-dependent mechanism (PubMed:31694946)","subcellular_location":"Lysosome membrane; Early endosome membrane; Late endosome membrane; Cell membrane; Zymogen granule membrane","url":"https://www.uniprot.org/uniprotkb/Q9BV40/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VAMP8","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000118640","cell_line_id":"CID000763","localizations":[{"compartment":"vesicles","grade":3},{"compartment":"membrane","grade":2}],"interactors":[{"gene":"RAB11A","stoichiometry":10.0},{"gene":"VAMP3;VAMP2","stoichiometry":10.0},{"gene":"STX12","stoichiometry":4.0},{"gene":"STX7","stoichiometry":4.0},{"gene":"VAMP3","stoichiometry":4.0},{"gene":"PTTG1IP","stoichiometry":4.0},{"gene":"SNAP23","stoichiometry":4.0},{"gene":"SNAP29","stoichiometry":4.0},{"gene":"STX8","stoichiometry":0.2},{"gene":"AK1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000763","total_profiled":1310},"omim":[{"mim_id":"620961","title":"SORTING NEXIN 25; SNX25","url":"https://www.omim.org/entry/620961"},{"mim_id":"619659","title":"SYNAPTOSOME-ASSOCIATED PROTEIN 47; SNAP47","url":"https://www.omim.org/entry/619659"},{"mim_id":"613515","title":"AUTOPHAGY-RELATED 14; ATG14","url":"https://www.omim.org/entry/613515"},{"mim_id":"607958","title":"SYNTAXIN-BINDING PROTEIN 6; STXBP6","url":"https://www.omim.org/entry/607958"},{"mim_id":"605703","title":"VAMP-ASSOCIATED PROTEIN A; VAPA","url":"https://www.omim.org/entry/605703"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VAMP8"},"hgnc":{"alias_symbol":["EDB","VAMP-8"],"prev_symbol":[]},"alphafold":{"accession":"Q9BV40","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BV40","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BV40-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BV40-F1-predicted_aligned_error_v6.png","plddt_mean":89.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VAMP8","jax_strain_url":"https://www.jax.org/strain/search?query=VAMP8"},"sequence":{"accession":"Q9BV40","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BV40.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BV40/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BV40"}},"corpus_meta":[{"pmid":"36724221","id":"PMC_36724221","title":"NRF2 controls iron homeostasis and ferroptosis through HERC2 and VAMP8.","date":"2023","source":"Science 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\"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoaffinity MS identification plus co-IP, single lab, no reconstitution\",\n      \"pmids\": [\"11278762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In antibody-inhibition experiments using rat liver cell-free systems, the Q-SNARE complex of syntaxin 7/Vti1b/syntaxin 8 plus VAMP8 mediates homotypic late-endosome fusion, while the same Q-SNAREs combine with VAMP7 for heterotypic late-endosome–lysosome fusion; separate co-immunoprecipitation confirmed distinct syntaxin 7 complexes with VAMP7 vs. VAMP8 in solubilized liver membranes.\",\n      \"method\": \"Antibody inhibition in cell-free fusion assay, co-immunoprecipitation, overexpression of VAMP7 N-terminal domain to inhibit heterotypic fusion\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — cell-free reconstitution with antibody inhibition plus reciprocal Co-IP, defining combinatorial SNARE specificity\",\n      \"pmids\": [\"15133481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"VAMP8 is enriched on zymogen granule membranes in pancreatic acinar cells and forms a SNARE complex with syntaxin 4 and SNAP-23. VAMP8-knockout mice accumulate zymogen granules (~3-fold) and show abolished secretagogue-stimulated exocytosis from acinar cells, establishing VAMP8 as the major v-SNARE for regulated exocytosis in exocrine pancreas.\",\n      \"method\": \"Targeted gene knockout in mice, immunohistochemistry, co-immunoprecipitation, secretion assay from pancreatic fragments\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with defined exocytotic phenotype plus Co-IP identification of SNARE complex, replicated across multiple readouts\",\n      \"pmids\": [\"15363411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"VAMP8 (endobrevin) is the primary v-SNARE for platelet dense-core granule, alpha-granule, and lysosome release; VAMP8-/- mouse platelets show significant agonist-induced secretion defects, while VAMP-2+/-, VAMP-3-/-, and VAMP-2+/-/VAMP-3-/- platelets show no defect. Tetanus toxin (cleaving VAMP-2/-3) blocks residual release in VAMP-8-/- platelets, revealing a secondary role for VAMP-2/-3.\",\n      \"method\": \"Genetic knockout (VAMP-8-/-, VAMP-2+/-, VAMP-3-/-) platelet secretion assays, tetanus toxin treatment of permeabilized platelets\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic KO models with specific secretion readouts, tetanus toxin orthogonal approach, strong mechanistic resolution\",\n      \"pmids\": [\"17065550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"VAMP-3 and VAMP-8 (but not VAMP-1 or VAMP-2) are identified in human platelets by mass spectrometry co-immunoprecipitated with syntaxin 4; recombinant VAMP-8 added to permeabilized platelets inhibits dense-granule secretion but not alpha-granule secretion, while rVAMP-3 inhibits both, demonstrating isoform-specific roles in platelet exocytosis.\",\n      \"method\": \"Nano-ESI tandem MS, immunoblotting, co-immunoprecipitation with syntaxin 4, competitive inhibition assay with recombinant VAMPs in permeabilized platelets\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification plus functional competition assay with recombinant proteins in permeabilized cells\",\n      \"pmids\": [\"12130530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"VAMP8 is expressed in all examined exocrine tissues (salivary, lacrimal, sweat, sebaceous, mammary glands, prostate). VAMP8-null mice show severe secretory granule accumulation and impaired pilocarpine-stimulated secretion in salivary and lacrimal glands; VAMP8 co-immunoprecipitates with syntaxin 4 and SNAP-23, establishing it as a general v-SNARE for regulated exocrine secretion.\",\n      \"method\": \"VAMP8-null mouse phenotyping, immunohistochemistry, electron microscopy, stimulated secretion assay, co-immunoprecipitation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple exocrine tissue phenotypes, stimulated secretion assay, and Co-IP identification of SNARE complex\",\n      \"pmids\": [\"17215514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In permeabilized rat basophilic leukaemia cells, recombinant VAMP8/endobrevin (but not other R-SNAREs tested) specifically blocks hexosaminidase exocytosis; this secretion is insensitive to clostridial neurotoxins, consistent with VAMP8 serving as the primary R-SNARE for mast cell granule exocytosis.\",\n      \"method\": \"Permeabilized cell exocytosis inhibition assay with complete set of recombinant mammalian R-SNAREs, hexosaminidase release assay, clostridial neurotoxin treatment\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution-type competition assay with full R-SNARE panel, single lab\",\n      \"pmids\": [\"17618625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In bone marrow-derived mast cells, VAMP-8 co-localizes with secretory granules and redistributes upon stimulation, forming increased SNARE complexes with SNAP-23 and syntaxin-4. VAMP-8-deficient BMMCs show markedly reduced degranulation after IgE/antigen, thapsigargin, or ionomycin stimulation; plasma histamine is reduced in passive systemic anaphylaxis in VAMP-8-/- mice. Cytokine/chemokine release is not affected, while unprocessed TNF accumulates at the plasma membrane in a VAMP-3-positive compartment, demonstrating that VAMP-8 segregates granule exocytosis from cytokine trafficking.\",\n      \"method\": \"VAMP-8 KO mice, bone marrow-derived mast cell degranulation assays, confocal microscopy, SNARE complex immunoprecipitation, passive systemic anaphylaxis model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple in vitro and in vivo secretion readouts, Co-IP demonstrating SNARE complex formation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"18203950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VAMP8 is the zymogen granule SNARE mediating basolateral exocytosis in alcoholic pancreatitis; ethanol exposure redirects apical to basolateral exocytosis in WT acini, but VAMP8-/- mice show blockade of both apical and basolateral exocytosis. Electron microscopy revealed reduced ZG-ZG homotypic fusions in VAMP8-/- acinar cells, establishing VAMP8 as critical for ZG-ZG fusion and basolateral secretion.\",\n      \"method\": \"VAMP8-/- mice, in vitro ethanol exposure + carbachol stimulation, amylase secretion assay, electron microscopy of ZG-ZG fusions\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined secretion phenotype plus ultrastructural (EM) evidence for ZG-ZG fusion defect\",\n      \"pmids\": [\"18535671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In mature human intestinal mast cells, VAMP-7 and VAMP-8 translocate to the plasma membrane and interact with SNAP-23 and STX-4 upon activation; inhibition of VAMP-7 or VAMP-8 (but not VAMP-2 or VAMP-3) markedly reduces IgE receptor-mediated histamine release, defining VAMP-7 and VAMP-8 as the required v-SNAREs for human mast cell degranulation.\",\n      \"method\": \"Primary human mast cell isolation, VAMP peptide inhibition, SNAP-23/STX-4 co-immunoprecipitation, histamine release assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional inhibition assay in primary human cells, single lab\",\n      \"pmids\": [\"18253931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"VAMP8 is localized to CTL lytic granules; VAMP8-/- CTL show normal immunological synapse formation and granule polarization but significantly reduced granzyme A and granzyme B secretion, establishing VAMP8 as a v-SNARE required for lytic granule fusion with the plasma membrane during CTL-mediated killing.\",\n      \"method\": \"VAMP8-/- mice, CTL cytotoxicity assay, granzyme secretion assay, immunofluorescence colocalization\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with specific lytic granule secretion readout, granule polarization shown to be normal (ruling out upstream defect)\",\n      \"pmids\": [\"19830729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"VAMP8 localizes to secretory granules in macrophages and mediates TNF-alpha release; TNF-alpha co-localizes with VAMP8-positive vesicles in WT macrophages, while VAMP8-/- macrophages show inhibited TNF-alpha secretion and reduced degranulation. VAMP8-/- mice are protected from C5a-induced neutropenia, peritonitis, and systemic inflammation.\",\n      \"method\": \"VAMP8-/- mice, macrophage degranulation assay, TNF-alpha ELISA, confocal colocalization, in vivo peritonitis model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with in vitro and in vivo secretion phenotypes and colocalization demonstrating VAMP8-positive TNF-alpha vesicles\",\n      \"pmids\": [\"19564343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"VAMP8 depletion in mice causes hydronephrosis and a 3–5-fold increase in aquaporin 2 (AQP2) levels; vasopressin/forskolin-induced AQP2 exocytosis is impaired in VAMP8-null collecting duct cells. VAMP8 co-localizes with AQP2 on intracellular vesicles and interacts with syntaxin 4 and syntaxin 3 t-SNAREs, establishing a role in regulated AQP2 trafficking to the plasma membrane.\",\n      \"method\": \"VAMP8-null mice, immunofluorescence colocalization, exocytosis assay in collecting duct cells, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with specific phenotype, colocalization, and Co-IP identifying SNARE partners for AQP2 vesicle fusion\",\n      \"pmids\": [\"19841070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Knockdown of Vti1b and VAMP8 with siRNA disturbs autophagosome-lysosome fusion (LC3/LAMP1 colocalization reduced) without affecting bacterial invasion efficiency, but impairs cellular bactericidal efficiency in xenophagy (Group A Streptococcus). The same SNARE pair (VAMP8 + Vti1b) is required for canonical autophagosome-lysosome fusion; knockdown of syntaxin 7 or syntaxin 8 had little effect on autophagic fusion.\",\n      \"method\": \"siRNA knockdown, confocal microscopy for LC3/LAMP1 colocalization, bacterial survival assay, canonical autophagy LC3-II degradation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA loss-of-function with multiple functional readouts (xenophagy and canonical autophagy), negative controls for non-relevant SNAREs\",\n      \"pmids\": [\"20089838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In VAMP8-null mice, sarcolemmal GLUT4 levels are increased in both basal and insulin-stimulated states without change in total GLUT4, indicating VAMP8 is required for endocytosis of the insulin-responsive GLUT4 transporter. VAMP8-null mice display fasting hypoglycemia, enhanced glucose tolerance, and increased skeletal muscle glucose uptake.\",\n      \"method\": \"VAMP8-null mice, euglycemic-hyperinsulinemic clamp with radiotracer glucose uptake, immunofluorescence microscopy for sarcolemmal GLUT4\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with quantitative in vivo glucose clamp and surface GLUT4 imaging, single lab\",\n      \"pmids\": [\"20876717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Vti1b-deficient and Vamp8-deficient CTL show significantly reduced degranulation (CD107a surface exposure) and ~50% reduced cytotoxic activity after 3 days of antigen-specific stimulation; by day 4, cytotoxic activity is no longer impaired, suggesting a compensable role for both SNARE proteins in lytic granule exocytosis during early CTL development.\",\n      \"method\": \"Vti1b-KO and Vamp8-KO TCR-transgenic OT-I mice, CD107a degranulation assay, cytolytic activity assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with specific degranulation and cytotoxicity readouts, single lab; compensability limits mechanistic specificity\",\n      \"pmids\": [\"20543108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP8 is specifically required for sequential (granule-to-granule) compound exocytosis in pancreatic acinar cells. Using an assay distinguishing primary (granule-plasma membrane) from secondary (granule-granule) fusion events, VAMP8-KO acinar cells show specific reduction in secondary granule fusion but not primary fusion. Immunoprecipitation shows syntaxin 3 associates with VAMP8 for granule-granule fusion, while syntaxin 2 associates with VAMP2 for primary fusion.\",\n      \"method\": \"VAMP8-KO mice, two-photon live-cell imaging distinguishing primary vs. secondary fusion events, immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — novel assay discriminating fusion event types in KO acinar cells plus Co-IP identifying distinct SNARE complex compositions\",\n      \"pmids\": [\"21733851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP8 localizes predominantly to goblet cell mucin granules in human airway epithelium; siRNA/shRNA knockdown of VAMP8 reduces mucin secretion stimulated by PAR agonists, neutrophil elastase, and ATP, as well as basal secretion. VAMP8-KO mice with IL-13-induced mucous metaplasia show reduced mucin in bronchoalveolar lavage. Knockdown of VAMP2 or VAMP3 does not affect mucin secretion.\",\n      \"method\": \"VAMP8 siRNA/shRNA knockdown in airway epithelial cell cultures, mucin secretion assay, VAMP8-KO mice with mucous metaplasia model, immunolocalization\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA/shRNA in human cells plus genetic KO in mice with specific secretion readouts and negative controls for VAMP2/3\",\n      \"pmids\": [\"22144578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VAMP8-null mice show impaired insulin granule recruitment to the plasma membrane contributing to reduced GLP-1 potentiation of glucose-stimulated insulin secretion; however, VAMP8-null mice also display increased islet β cell mass from enhanced β cell mitosis, amplified by GLP-1, demonstrating a dual role of VAMP8 in insulin granule exocytosis and islet β cell growth.\",\n      \"method\": \"VAMP8-null mice, glucose-stimulated insulin secretion assay, islet morphometry, β cell proliferation assay, GLP-1 treatment\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with multiple in vitro and in vivo secretion and proliferation readouts, single lab\",\n      \"pmids\": [\"22841572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The Leishmania surface metalloprotease GP63 cleaves VAMP8 (among other SNAREs) on phagosomes. GP63-mediated VAMP8 inactivation (or Vamp8 gene disruption) prevents NADPH oxidase (NOX2) complex assembly on phagosomes, altering phagosomal pH and degradative properties, and inhibiting MHC class I cross-presentation of Leishmania antigens, thereby reducing T cell activation.\",\n      \"method\": \"GP63 cleavage of VAMP8 (biochemical), Vamp8 KO cells/mice, phagosomal NOX2 assembly assay, phagosomal pH measurement, MHC class I cross-presentation assay, T cell activation assay\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical cleavage assay plus genetic KO with multiple orthogonal functional readouts (NOX2 assembly, pH, cross-presentation, T cell activation)\",\n      \"pmids\": [\"23870310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In primary human CTLs, VAMP8 co-localizes with Rab11a-positive recycling endosomes (not cytotoxic granules). Upon stimulation, VAMP8-positive recycling endosomes traffic to and fuse with the plasma membrane at immune synapses before cytotoxic granule fusion. VAMP8 knockdown blocks both recycling endosome and cytotoxic granule fusion. Mechanistically, VAMP8-dependent recycling endosome fusion deposits syntaxin-11 at immune synapses to facilitate assembly of plasma membrane SNARE complexes required for cytotoxic granule exocytosis.\",\n      \"method\": \"Confocal and TIRF microscopy in primary human CTLs, VAMP8 siRNA knockdown, live-cell imaging of vesicle fusion kinetics, syntaxin-11 localization assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live TIRF imaging plus knockdown with specific sequential fusion readouts and syntaxin-11 mechanistic link, primary human cells\",\n      \"pmids\": [\"26124288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Starvation induces Sbf/MTMR13 GEF activity and RAB21 activation, which promotes MTMR13 and RAB21 binding to VAMP8, facilitating endolysosomal trafficking of VAMP8 to lysosomes required for autophagosome-lysosome fusion. Depletion of Sbf/MTMR13 or Rab21 blocks VAMP8 endolysosomal delivery and impairs starvation-induced autophagy.\",\n      \"method\": \"Drosophila and mammalian cell depletion experiments, Rab21 GEF activity assay, co-immunoprecipitation of MTMR13/RAB21 with VAMP8, autophagy flux assay, endolysosomal trafficking assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus GEF activity assay and knockdown with autophagy readouts, single lab\",\n      \"pmids\": [\"25648148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VAMP8 mediates NOX2 trafficking not only to phagosomes but also to endosomes in both human and mouse dendritic cells. Absence of VAMP8 leads to decreased ROS production, reduced lipid peroxidation, impaired antigen translocation to cytosol, and impaired cross-presentation; VAMP8 knockdown did not affect MHC class I or TAP1 recruitment to phagosomes.\",\n      \"method\": \"VAMP8 knockdown in human and mouse DCs, NOX2 recruitment assay, ROS measurement, lipid peroxidation assay, antigen translocation and cross-presentation assay\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown in primary cells with multiple orthogonal mechanistic readouts, single lab\",\n      \"pmids\": [\"28688576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"APOL1 protein interacts with VAMP8 in podocytes; this interaction was confirmed by co-immunoprecipitation and surface plasmon resonance. APOL1 disease-associated variants attenuate this interaction. Molecular dynamics simulations and circular dichroism spectroscopy reveal that variant APOL1 has increased C-terminal conformational stability (a more closed/autoinhibited state), reducing interaction with VAMP8-coated vesicles.\",\n      \"method\": \"Co-immunoprecipitation, surface plasmon resonance, molecular dynamics simulation, circular dichroism spectroscopy, structural homology search\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — SPR (biophysical binding assay) plus Co-IP and computational structural analysis, single lab\",\n      \"pmids\": [\"28724794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VAMP8 is present on mucin granules in intestinal goblet cells and is specifically activated during Entamoeba histolytica infection to coordinate mucin exocytosis; ablation of VAMP8 impairs mucin secretion, increases E. histolytica adherence and epithelial cell apoptosis, and triggers a proinflammatory response (IL-1α, IL-1β, TNF-α).\",\n      \"method\": \"VAMP8 siRNA knockdown in human goblet cells, Vamp8-/- mice, E. histolytica infection model, mucin secretion assay, apoptosis assay, cytokine measurement\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA plus genetic KO mice with multiple functional readouts (mucin secretion, infection outcome, inflammation), single lab\",\n      \"pmids\": [\"28974617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VAMP8 knockdown reduced JAK1 and STAT1 phosphorylation and impaired induction of interferon-stimulated genes (ISGs) following West Nile virus infection or IFN-β treatment; VAMP8-mediated STAT1 phosphorylation required presence of TRIM6, identifying VAMP8 as a novel regulator of type I interferon signaling downstream of TRIM6.\",\n      \"method\": \"VAMP8 siRNA knockdown in human cells, phospho-JAK1/STAT1 western blotting, ISG induction assay, next-generation sequencing identification of VAMP8\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with signaling pathway readouts and TRIM6 epistasis, single lab\",\n      \"pmids\": [\"31694946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VAMP8 interacts with the metastasis suppressor GTPase RAB37; confocal and TIRF microscopy show VAMP8 co-localizes with RAB37 and facilitates trafficking of RAB37-TIMP1 vesicles. VAMP8 is required for RAB37-regulated exocytosis of TIMP1 to suppress lung cancer metastasis, demonstrated by tail-vein injection reconstitution experiments.\",\n      \"method\": \"Co-immunoprecipitation, confocal and TIRF microscopy, exocytosis/secretion assay for TIMP1, tail-vein injection metastasis model, lung-to-lung metastasis reconstitution\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus live imaging and in vivo reconstitution, single lab\",\n      \"pmids\": [\"30165196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VAMP8 coordinates MUC2 mucin exocytosis from colonic goblet cells; Vamp8-/- mice exhibit altered mucus layer, increased encounters with microbial antigens, shift to detrimental microbiota, mild basal pro-inflammatory state, and high susceptibility to chemical and infectious colitis, demonstrating essential role of VAMP8 in intestinal homeostasis via mucus exocytosis.\",\n      \"method\": \"Vamp8-/- mice, mucin secretion assay, intestinal microbiota analysis, colitis models (chemical and infectious), immunology assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in mice with multiple in vivo phenotypes and mechanistic link to mucin exocytosis, single lab\",\n      \"pmids\": [\"31541089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Defective AP-3-dependent trafficking in Hermansky-Pudlak Syndrome type 2 (HPS2) endothelial cells depletes VAMP8 from Weibel-Palade bodies; CRISPR-Cas9-engineered VAMP8-/- endothelial cells show impaired stimulus-induced von Willebrand factor secretion, establishing VAMP8 as an AP-3-dependent SNARE required for Weibel-Palade body exocytosis.\",\n      \"method\": \"Patient-derived blood outgrowth endothelial cells, CRISPR-Cas9 KO of VAMP8, proteome analysis, von Willebrand factor secretion assay\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with specific secretion phenotype plus proteomics identifying trafficking pathway, single lab\",\n      \"pmids\": [\"30630984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"mTORC1 directly phosphorylates VAMP8, inhibiting formation of the STX17-SNAP29-VAMP8 SNARE complex and thereby blocking autophagosome-lysosome fusion. A VAMP8 phosphorylation mimic mutant fails to promote autophagosome-lysosome fusion in vitro. Dephosphorylated VAMP8 promotes recruitment of SCFD1 (Sec1/Munc18-like protein) to autolysosomes; phosphorylated VAMP8 or SCFD1 depletion inhibits fusion. Expression of phosphomimic VAMP8 in mouse liver increases lipid droplet accumulation.\",\n      \"method\": \"mTORC1 kinase assay (phosphorylation), in vitro fusion assay with phosphomimic VAMP8, SCFD1 localization assay, Co-IP for SNARE complex, liver lipid droplet assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay plus in vitro fusion reconstitution with mutants, SCFD1 localization assay, and in vivo liver phenotype\",\n      \"pmids\": [\"34785650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VAMP8 on lysosomes assists in forming prefusion clusters of multiple lysosomes around individual autophagosomes upon stimulation. A VAMP8 phosphorylation mimic reduces fusion in a lipid-mixing ensemble assay and increases unfused lysosomes associated with autophagosomes, suggesting phosphorylation minimizes spontaneous autophagosome-lysosome fusion under normal conditions while pre-assembling lysosomes for stimulated autophagy.\",\n      \"method\": \"Structured illumination microscopy, ensemble lipid-mixing fusion assay, VAMP8 phosphorylation mimic mutation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro lipid-mixing assay plus structured illumination imaging with phosphomimic, single lab\",\n      \"pmids\": [\"34645799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRF2 transcriptionally maintains VAMP8 expression; NRF2-knockout cells have low VAMP8, which blocks autophagosome-lysosome fusion (ferritinophagy), leading to apoferritin accumulation in autophagosomes and an elevated labile iron pool, enhancing sensitivity to ferroptosis.\",\n      \"method\": \"NRF2 knockout cells, VAMP8 protein/mRNA measurement, LC3/LAMP1 colocalization assay, ferritin/NCOA4 immunoblotting, ferroptosis assay\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO cells with VAMP8 expression and autophagosome fusion readouts linking NRF2-VAMP8 axis to iron homeostasis, single lab\",\n      \"pmids\": [\"36724221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DRAM1 physically interacts with VAMP8 on lysosomes; this interaction is enhanced upon autophagy stimulation. DRAM1 preferentially promotes autophagosome-lysosome fusion by enhancing assembly of the STX17-SNAP29-VAMP8 complex. DRAM1 stabilizes lysosomal VAMP8 by inhibiting CHIP-mediated ubiquitination of VAMP8 at Lys68, 72, and 75, competitively binding CHIP.\",\n      \"method\": \"Co-immunoprecipitation, STX17-SNAP29-VAMP8 complex assembly assay, ubiquitination assay, CHIP-VAMP8 binding competition, site-directed mutagenesis of Lys68/72/75, autophagy flux assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP with complex assembly assay, ubiquitination mapping with site-specific mutagenesis, and competitive binding assay, multiple orthogonal methods\",\n      \"pmids\": [\"40595569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Salmonella SopB-generated PtdIns(3)P directly binds VAMP8/endobrevin and recruits it to Salmonella-induced macropinosomes in a nocodazole-dependent, Brefeldin A-independent manner; knockdown of VAMP8 or expression of truncated VAMP8 (1-79aa) reduces Salmonella invasion efficiency to the level of SopB phosphatase-dead mutant, demonstrating that bacteria exploit VAMP8 and PtdIns(3)P binding to promote phagocytosis.\",\n      \"method\": \"PtdIns(3)P–VAMP8 direct binding assay, VAMP8 siRNA knockdown, confocal colocalization, pharmacological inhibitors (wortmannin, nocodazole, Brefeldin A), bacterial invasion assay\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct lipid-binding assay plus siRNA knockdown with invasion readout, single lab\",\n      \"pmids\": [\"17645435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VAMP8-mediated ZG exocytosis depends on constitutive-like secretory pathway via early endosomal proteins Rab5/D52/EEA1; VAMP8-/- acini show >90% decrease in Rab5/D52/EEA1 and increased Rab11a/TI-VAMP7 on ZGs. GDP-trapped Rab11a-S25N specifically inhibits the VAMP8 but not VAMP2 secretion pathway; rescue of Rab5/D52/EEA1 expression restores VAMP8-dependent secretion.\",\n      \"method\": \"VAMP8-/- acini, Rab11a dominant-negative expression, adenoviral D52/Rab5 rescue, perifusion secretion kinetics assay, confocal colocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus dominant-negative epistasis plus rescue experiment with specific secretion phase readout\",\n      \"pmids\": [\"25138214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"O-GlcNAc modification of SNAP29 inhibits formation of the SNAP29-STX17-VAMP8 SNARE complex; co-immunoprecipitation in diabetic rat cardiomyocytes showed that increased O-GlcNAc-SNAP29 disrupts STX17-VAMP8 complex assembly, blocking autophagic flux and exacerbating myocardial injury.\",\n      \"method\": \"Co-immunoprecipitation of SNAP29-STX17-VAMP8 complex, O-GlcNAc modification assay, STZ diabetic rat model, thiamet G and DON pharmacological tools, autophagy flux assay\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of SNARE complex under O-GlcNAc manipulation with autophagy flux readout, single lab\",\n      \"pmids\": [\"30221662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In dendritic cells, caspases regulate VAMP-8 expression; VAMP-8 protein is a substrate of caspases, and treatment with caspase inhibitor upregulates VAMP-8. Consistent with VAMP-8's role in inhibiting phagocytosis in DCs, immature DCs treated with caspase inhibitor show lower phagocytosis activity.\",\n      \"method\": \"Caspase inhibitor treatment, VAMP-8 expression analysis, phagocytosis assay, identification of caspase cleavage sites on VAMP-8\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (pharmacological caspase inhibition) with expression and phagocytosis readout, no direct cleavage validation, single lab\",\n      \"pmids\": [\"19607812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VAMP8 overexpression in neuronal cells (N2a) significantly increases tau secretion via late endosome-plasma membrane fusion, reducing intracellular tau levels; TIRF microscopy shows fusion of VAMP8-positive vesicles with plasma membrane correlates with cytoplasmic tau depletion. VAMP8 overexpression also reduces intracellular α-synuclein by increasing secretion.\",\n      \"method\": \"VAMP8 overexpression in N2a cells and murine hippocampal slices, intracellular/extracellular tau quantification, TIRF microscopy of VAMP8-positive vesicle fusion\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression with TIRF live imaging of fusion events correlated with tau depletion, single lab\",\n      \"pmids\": [\"33454017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Oxidative stress inhibits endocytosis, decreasing lysosomal localization of VAMP8 and blocking autophagosome-lysosome fusion in human neuroblastoma cells; treatment with an endocytosis inhibitor recapitulates the VAMP8 lysosomal depletion and autophagy block, establishing that endocytic trafficking is required for VAMP8 delivery to lysosomes for autophagy.\",\n      \"method\": \"Oxidative stress induction, endocytosis inhibitor treatment, lysosomal VAMP8 localization assay (immunofluorescence), autophagosome-lysosome fusion assay\",\n      \"journal\": \"Biological & pharmaceutical bulletin\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological inhibition with localization and fusion readouts, no direct VAMP8 manipulation, single lab\",\n      \"pmids\": [\"36328496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CENPN inhibits VAMP8 transcription by reducing phospho-CREB binding to the VAMP8 promoter; CENPN knockdown increases p-CREB nuclear translocation and VAMP8 expression, enhancing autophagic flux and paclitaxel sensitivity in nasopharyngeal carcinoma. Sequential knockdown of CENPN and VAMP8 reverses the PTX-sensitizing effect of CENPN knockdown, confirming VAMP8 as the mediator.\",\n      \"method\": \"ChIP assay for p-CREB binding to VAMP8 promoter, siRNA/shRNA knockdown, autophagy flux assay, nude mouse xenograft PTX sensitivity assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay for transcriptional regulation plus double-knockdown epistasis, single lab\",\n      \"pmids\": [\"37776538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VAMP8 interacts with DDX5 in osteosarcoma cells; this interaction promotes DDX5 degradation via the ubiquitin-proteasome system, reducing β-catenin levels and suppressing EMT and metastasis. VAMP8 also promotes autophagy flux as a potential additional metastasis-suppressive mechanism.\",\n      \"method\": \"Co-immunoprecipitation of VAMP8-DDX5, ubiquitin-proteasome inhibitor experiments, β-catenin expression, EMT marker analysis, invasion/migration assays\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP plus pharmacological UPS inhibition with limited mechanistic validation of ubiquitination, single lab\",\n      \"pmids\": [\"37405957\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VAMP8 (endobrevin) is an R-SNARE that resides on late endosomal/lysosomal membranes and secretory granules, where it forms combinatorial SNARE complexes (with syntaxin 7/Vti1b/syntaxin 8 for late-endosome homotypic fusion; with syntaxin 4/SNAP-23 for regulated exocytosis; and with STX17/SNAP29 for autophagosome-lysosome fusion) to mediate membrane fusion events across multiple cell types—including pancreatic acinar, mast, platelet, goblet, and immune effector cells—while its activity is regulated post-translationally by mTORC1-dependent phosphorylation (which inhibits SNARE complex assembly and is countered by SCFD1 recruitment), CHIP-mediated ubiquitination (stabilized by DRAM1 interaction), and endocytic trafficking (Sbf/MTMR13-RAB21 pathway) that delivers VAMP8 to lysosomes for sustained autophagic flux.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VAMP8 (endobrevin) is an R-SNARE (v-SNARE) that drives membrane fusion across two broad functional domains: the late endocytic/autophagic pathway and regulated exocytosis from specialized secretory cells [#0, #3]. In the endolysosomal system, VAMP8 partners with the Q-SNARE complex syntaxin 7/Vti1b/syntaxin 8 to mediate homotypic late-endosome fusion, with VAMP7 substituting for heterotypic late-endosome–lysosome fusion, defining combinatorial SNARE specificity [#0, #2]. In autophagy, VAMP8 assembles with STX17 and SNAP29 to execute autophagosome-lysosome fusion, a step required for canonical autophagy and xenophagy [#14, #30]. In regulated secretion, VAMP8 forms complexes with syntaxin 4 and SNAP-23 (and syntaxin 3) to serve as the principal v-SNARE for stimulated exocytosis from a striking range of cell types: pancreatic acinar zymogen granules, where it specifically mediates granule-to-granule compound fusion [#3, #17]; platelet dense and alpha granules [#4, #5]; mast cell secretory granules [#7, #8]; cytotoxic lymphocyte lytic granules [#11, #21]; macrophage TNF-alpha granules [#12]; goblet cell mucin granules [#18, #28]; endothelial Weibel-Palade bodies [#29]; and AQP2- and GLUT4-containing vesicles in epithelial and metabolic tissues [#13, #15]. VAMP8 activity is post-translationally gated: mTORC1 phosphorylation blocks STX17-SNAP29-VAMP8 assembly and is countered by recruitment of the Sec1/Munc18 protein SCFD1 [#30], while DRAM1 stabilizes lysosomal VAMP8 by competitively inhibiting CHIP-mediated ubiquitination at Lys68/72/75 [#33]. Beyond fusion, VAMP8 traffics the NOX2 oxidase to phagosomes and endosomes to support reactive oxygen production and MHC class I cross-presentation, a function pathogens such as Leishmania subvert by GP63-mediated VAMP8 cleavage [#20, #23]. VAMP8-null mice exhibit accumulation of secretory granules and broad secretion defects across exocrine, immune, and metabolic tissues, with downstream consequences including intestinal mucus dysfunction and colitis susceptibility [#3, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established VAMP8 as the v-SNARE partner for syntaxin 7 in the late endocytic pathway, answering which fusion machinery drives late endosome–lysosome traffic.\",\n      \"evidence\": \"Co-immunoprecipitation and cell-free in vitro fusion assay with immunolocalization\",\n      \"pmids\": [\"10982406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve full Q-SNARE composition\", \"Homotypic vs heterotypic fusion roles not yet distinguished\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined combinatorial SNARE specificity, showing VAMP8 with syntaxin 7/Vti1b/syntaxin 8 mediates homotypic late-endosome fusion while VAMP7 substitutes for heterotypic late-endosome–lysosome fusion.\",\n      \"evidence\": \"Antibody inhibition in cell-free fusion assay plus reciprocal Co-IP\",\n      \"pmids\": [\"15133481\", \"11278762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative kinetics of complex assembly not measured\", \"Regulation of complex selection unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified VAMP8 as the major v-SNARE for regulated exocytosis, redirecting it from a purely endosomal role to a secretory granule fusion machine.\",\n      \"evidence\": \"Targeted gene knockout in mice with zymogen granule accumulation and abolished stimulated exocytosis, plus Co-IP of syntaxin 4/SNAP-23 complex\",\n      \"pmids\": [\"15363411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing exocytic from endosomal complex assembly unclear\", \"Regulation of granule recruitment not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Generalized VAMP8 as the primary R-SNARE for stimulated secretion across hematopoietic and immune effector cells, with VAMP2/3 as a minor backup.\",\n      \"evidence\": \"Multiple genetic KO platelet models, recombinant VAMP competition in permeabilized platelets and mast cells, clostridial neurotoxin treatment\",\n      \"pmids\": [\"17065550\", \"12130530\", \"17618625\", \"18203950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Granule-subtype selectivity (dense vs alpha) mechanism not fully resolved\", \"Coupling to calcium-triggered fusion unaddressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended VAMP8 to lytic granule and cytokine secretion in cytotoxic lymphocytes and macrophages, separating granule exocytosis from upstream polarization.\",\n      \"evidence\": \"VAMP8-KO CTL and macrophage secretion/cytotoxicity assays with normal granule polarization, in vivo inflammation models\",\n      \"pmids\": [\"19830729\", \"19564343\", \"20543108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensability with Vti1b limits specificity\", \"t-SNARE partners at the immune synapse not yet mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed VAMP8 at the autophagosome-lysosome fusion step, defining its role in autophagic flux and xenophagy.\",\n      \"evidence\": \"siRNA knockdown of VAMP8/Vti1b with LC3/LAMP1 colocalization, bactericidal and canonical autophagy assays, negative controls for syntaxin 7/8\",\n      \"pmids\": [\"20089838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Q-SNARE partner for autophagic fusion not yet identified here\", \"Regulation of VAMP8 delivery to autophagic membranes unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Distinguished VAMP8's specific role in granule-to-granule compound exocytosis versus primary granule-plasma membrane fusion, mapping distinct syntaxin partners.\",\n      \"evidence\": \"Two-photon live imaging of primary vs secondary fusion in VAMP8-KO acinar cells plus Co-IP of syntaxin 3 vs syntaxin 2/VAMP2\",\n      \"pmids\": [\"21733851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial control of compound vs primary fusion not resolved\", \"How VAMP8 is partitioned between granule populations unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Broadened VAMP8 function to epithelial and metabolic vesicle trafficking, including AQP2 exocytosis and GLUT4 endocytosis.\",\n      \"evidence\": \"VAMP8-null mice with hydronephrosis/AQP2 accumulation, glucose clamp with surface GLUT4 imaging, Co-IP of syntaxin 3/4\",\n      \"pmids\": [\"19841070\", \"20876717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Directionality (exocytic vs endocytic) mechanism across tissues unclear\", \"Whether the same SNARE complexes operate in endocytosis not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed a non-canonical VAMP8 function in delivering the NOX2 oxidase to phagosomes/endosomes for ROS production and cross-presentation, and showed pathogens cleave VAMP8 to subvert this.\",\n      \"evidence\": \"GP63 biochemical cleavage of VAMP8, Vamp8 KO cells with NOX2 assembly, phagosomal pH, cross-presentation and T cell activation assays; siRNA in dendritic cells\",\n      \"pmids\": [\"23870310\", \"28688576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SNARE-independent vs fusion-dependent contribution to NOX2 delivery unresolved\", \"Mechanism of NOX2 vesicle recruitment by VAMP8 unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved post-translational and trafficking control of the autophagic VAMP8 pool, linking starvation signaling to lysosomal VAMP8 delivery.\",\n      \"evidence\": \"Sbf/MTMR13-RAB21 GEF and Co-IP assays in Drosophila and mammalian cells with autophagy flux readouts; sequential recycling-endosome fusion in CTLs by TIRF imaging\",\n      \"pmids\": [\"25648148\", \"26124288\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings without reconstitution of the trafficking step\", \"How RAB21 binding alters VAMP8 sorting structurally unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined mTORC1 phosphorylation as a master switch that inhibits STX17-SNAP29-VAMP8 assembly, with SCFD1 and prefusion lysosome clustering tuning stimulated autophagic fusion.\",\n      \"evidence\": \"In vitro mTORC1 kinase assay, phosphomimic VAMP8 in reconstituted fusion and lipid-mixing assays, SCFD1 localization, SIM imaging, in vivo liver lipid phenotype\",\n      \"pmids\": [\"34785650\", \"34645799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase reversing VAMP8 phosphorylation not identified\", \"Phosphosite-resolved structural mechanism of inhibited assembly incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a stabilization circuit in which DRAM1 protects lysosomal VAMP8 from CHIP-mediated ubiquitination to promote autophagic SNARE assembly, complementing transcriptional control by NRF2, CREB/CENPN, and modification of SNAP29.\",\n      \"evidence\": \"Co-IP, complex assembly and ubiquitination assays with Lys68/72/75 mutagenesis and CHIP competition; NRF2-KO and CENPN ChIP/knockdown studies; O-GlcNAc SNAP29 Co-IP\",\n      \"pmids\": [\"40595569\", \"36724221\", \"37776538\", \"30221662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of these parallel regulatory inputs in vivo not resolved\", \"Deubiquitinase counteracting CHIP not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How VAMP8 is partitioned and selectively recruited among its many membrane compartments (late endosomes, autophagosomes, and diverse secretory granules) to assemble the correct combinatorial SNARE complex remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of compartment-specific complex selection\", \"Sorting determinants directing VAMP8 to distinct granule types unknown\", \"Coordination of phosphorylation, ubiquitination, and trafficking inputs in a single cell not integrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 3, 30]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 2, 21]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 30, 33, 39]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [3, 4, 8, 12, 13, 18, 29]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [10, 21, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [14, 22, 30, 33]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 13, 15]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 4, 8, 17, 29]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 12, 20, 23]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [4, 5, 29]}\n    ],\n    \"complexes\": [\n      \"STX17-SNAP29-VAMP8 SNARE complex\",\n      \"syntaxin 7/Vti1b/syntaxin 8/VAMP8 late-endosome SNARE complex\",\n      \"syntaxin 4/SNAP-23/VAMP8 exocytic SNARE complex\"\n    ],\n    \"partners\": [\n      \"STX7\",\n      \"VTI1B\",\n      \"STX8\",\n      \"STX4\",\n      \"SNAP23\",\n      \"STX17\",\n      \"SNAP29\",\n      \"SCFD1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}