{"gene":"VAMP7","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1999,"finding":"VAMP7 localizes to late endosomes and lysosomes (co-localizing with LAMP-1) and antibodies against its cytoplasmic domain inhibit EGF receptor degradation (endosome-to-lysosome transport) but not transferrin recycling in streptolysin-O-permeabilized cells, establishing a role in vesicular transport from endosomes to lysosomes.","method":"Monoclonal/polyclonal antibody generation, immunohistochemistry, immunoelectron microscopy, streptolysin-O permeabilized cell transport assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional antibody inhibition in reconstituted permeabilized cell system, replicated across multiple labs in subsequent work","pmids":["10459012"],"is_preprint":false},{"year":1999,"finding":"In neurons, VAMP7/TI-VAMP localizes to a novel membrane compartment distinct from synaptic vesicles and large dense-core granules, concentrating in the leading edge of growth cones before synaptogenesis, suggesting a specialized exocytic vesicle pool for neurite outgrowth.","method":"Subcellular fractionation, immunoelectron microscopy, immunofluorescence in hippocampal neurons and PC12 cells","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunoelectron microscopy with functional inference; single lab, multiple imaging methods","pmids":["10559389"],"is_preprint":false},{"year":2000,"finding":"VAMP7 is required for late endosome-lysosome and homotypic lysosome fusion in alveolar macrophages; a soluble dominant-negative VAMP7 fragment (lacking transmembrane domain) inhibited both heterotypic late endosome-lysosome fusion and homotypic lysosome fusion in an in vitro cell-free fusion assay.","method":"In vitro cell-free fusion assay with dominant-negative bacterially-expressed VAMP7 fragment","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstituted fusion assay with recombinant dominant-negative protein; replicated across labs","pmids":["10888671"],"is_preprint":false},{"year":2000,"finding":"VAMP7/TI-VAMP is essential for vesicular transport mediating neurite outgrowth in staurosporine-differentiated PC12 cells; the N-terminal Longin domain inhibits association with SNAP-25, and expression of this domain blocks neurite outgrowth as potently as Botulinum neurotoxin E (which cleaves SNAP-25), while deletion of the Longin domain increases SNARE complex formation and strongly stimulates neurite outgrowth.","method":"Dominant-negative N-terminal domain expression, co-immunoprecipitation of SNARE complexes, neurite outgrowth assay in PC12 cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional domain dissection with gain- and loss-of-function, SNARE complex co-IP, replicated in subsequent studies","pmids":["10811829"],"is_preprint":false},{"year":2000,"finding":"In RBL-2H3 mast cells, VAMP7 localizes exclusively in granule membranes (not plasma membrane); upon antigen stimulation, VAMP7-positive granules move to the cell surface via fusion with the plasma membrane, suggesting VAMP7 mediates degranulation.","method":"RT-PCR, GFP-fusion protein live imaging, confocal microscopy","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — live-cell imaging with GFP constructs, single lab, no functional blockade experiment","pmids":["10777677"],"is_preprint":false},{"year":2001,"finding":"Syntaxin 7 forms SNARE complexes with either VAMP7 or VAMP8 (together with Syntaxin 6 and mVti1b) in B16 melanoma cells, as identified by large-scale Syntaxin 7 immunoprecipitation followed by mass spectrometry, indicating combinatorial SNARE assembly in the late endosomal pathway.","method":"Immunoaffinity purification, electrospray mass spectrometry, immunoblotting, immunofluorescence colocalization","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — large-scale Co-IP with mass spectrometry identification; single lab, no functional reconstitution","pmids":["11278762"],"is_preprint":false},{"year":2002,"finding":"In Dictyostelium discoideum, VAMP7 forms an active SNARE complex with Syntaxin 7, Vti1 and Syntaxin 8 in endosomes; co-immunoprecipitation and MS identified these partners, and soluble recombinant VAMP7 fragment inhibited in vitro reconstituted endosome fusion.","method":"Co-immunoprecipitation, mass spectrometry peptide sequencing, in vitro endosome fusion assay with recombinant VAMP7 fragment","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted fusion assay with inhibitory recombinant VAMP7 fragment plus Co-IP/MS complex identification; single lab with multiple orthogonal methods","pmids":["12175335"],"is_preprint":false},{"year":2003,"finding":"Ectopic expression of the plasma membrane t-SNARE syntaxin 1 in the ER redirects TI-VAMP/VAMP7 (and cellubrevin) to the ER in a microtubule-dependent manner, and TI-VAMP associates in vivo with exogenous syntaxin 1, demonstrating that the destination of v-SNAREs is driven by specific interactions with cognate t-SNAREs.","method":"Ectopic expression, co-immunoprecipitation, immunofluorescence, microtubule depolymerization","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo Co-IP and functional redistribution experiments; single lab, two orthogonal methods","pmids":["12759369"],"is_preprint":false},{"year":2004,"finding":"The Q-SNAREs syntaxin 7, Vti1b, and syntaxin 8 can pair with either VAMP8 (for homotypic late endosome fusion) or VAMP7 (for heterotypic late endosome–lysosome fusion), as shown by antibody inhibition in rat liver cell-free fusion systems and separate co-immunoprecipitation of syntaxin 7 complexes with VAMP7 or VAMP8. Overexpression of the VAMP7 N-terminal domain in fibroblasts inhibited mixing of lysosomal and late endosomal content markers.","method":"Antibody inhibition in rat liver cell-free fusion assay, co-immunoprecipitation, dominant-negative N-terminal domain overexpression, content-mixing assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — cell-free fusion reconstitution with antibody inhibition, reciprocal Co-IP, dominant-negative cell experiments; multiple orthogonal methods","pmids":["15133481"],"is_preprint":false},{"year":2004,"finding":"TI-VAMP/VAMP7 mediates late endocytic compartment exocytosis required for optimal Fc receptor- and complement receptor-mediated phagocytosis in macrophages; dominant-negative Longin domain expression and siRNA depletion of TI-VAMP blocked pseudopod extension and phagosome sealing.","method":"Dominant-negative domain expression, siRNA knockdown, scanning electron microscopy, exocytosis assays in macrophages","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent loss-of-function approaches (DN domain + siRNA) with defined phenotypic readout; replicated across multiple cell types and receptor types","pmids":["15470500"],"is_preprint":false},{"year":2004,"finding":"Hypertonicity-stimulated GLUT4 recruitment to the muscle cell surface is dependent on TI-VAMP/VAMP7 (but not VAMP2), as shown by siRNA knockdown of TI-VAMP reducing basal and hypertonicity-stimulated surface GLUT4; insulin stimulation was only partly reduced, indicating TI-VAMP and VAMP2 mediate GLUT4 trafficking from distinct pools.","method":"siRNA knockdown, surface GLUT4myc quantification, dominant-negative NSF expression in L6 myoblasts","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with quantitative surface receptor assay; single lab, two conditions tested","pmids":["15469990"],"is_preprint":false},{"year":2005,"finding":"Cdc42 and F-actin control the polarized accumulation and exocytosis of TI-VAMP/VAMP7-containing vesicles in hippocampal neuron growth cones; dominant-positive Cdc42 stimulates TI-VAMP exocytosis in an actin-dependent manner, as measured by pHLuorin-tagged TI-VAMP fluorescence.","method":"Dominant-positive Cdc42 expression, pHLuorin exocytosis assay, actin disruption, immunofluorescence in hippocampal neurons","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional pHLuorin exocytosis assay with genetic perturbation; single lab, multiple methods","pmids":["16381811"],"is_preprint":false},{"year":2006,"finding":"TI-VAMP/VAMP7 is insensitive to botulinum neurotoxin B due to at least 12 amino acid differences from VAMP-2 scattered along a 22-residue interface; replacement of specific residues (including Ile158, Thr161, and section 165-174) with VAMP-2 equivalents progressively restored cleavability.","method":"In vitro cleavage assays with chimeric VAMP7/VAMP2 hybrid proteins and point mutants","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic in vitro mutagenesis with enzymatic cleavage assay; single lab with comprehensive mutant series","pmids":["16430921"],"is_preprint":false},{"year":2007,"finding":"The Longin domain of TI-VAMP/VAMP7 has dual biochemical functions: it inhibits SNARE complex formation and binds to the δ subunit of AP-3, targeting TI-VAMP to late endosomes. Expression of the isolated Longin domain disrupts AP-3δ localization, impairs lysosomal secretion, blocks membrane repair after wounding, and inhibits epithelial cell migration.","method":"Inducible Longin domain expression in MDCK cells, immunofluorescence, lysosomal secretion assay, wound healing assay, electron microscopy","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative approach with multiple functional readouts; single lab","pmids":["17288539"],"is_preprint":false},{"year":2007,"finding":"VAMP7 is required for granzyme B release and target cell killing in NK cell line YT-Indy; siRNA knockdown of VAMP7 reduced granzyme B secretion to <1 ng/mL compared to 1.5-2.5 μg/mL in controls and caused a 7-fold reduction in NK cell-mediated Jurkat killing.","method":"siRNA knockdown, granzyme B secretion assay, cytotoxicity assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with quantitative secretion and killing assays; single lab","pmids":["18042464"],"is_preprint":false},{"year":2008,"finding":"Clathrin-mediated endocytosis of VAMP7 is directly mediated by the ArfGAP/clathrin adaptor Hrb, which wraps 20 residues of its unstructured C-terminal tail around the VAMP7 longin domain; disrupting this interaction causes VAMP7 accumulation at the cell surface. The VAMP7 SNARE helix can fold back onto the longin domain to compete with Hrb, suggesting Hrb-mediated endocytosis occurs preferentially when VAMP7 is in a cis-SNARE complex.","method":"Crystal structure of Hrb-VAMP7 longin domain complex, site-directed mutagenesis, Hrb depletion, cell surface VAMP7 quantification","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis validation in cells; multiple orthogonal methods in a single rigorous study","pmids":["18775314"],"is_preprint":false},{"year":2008,"finding":"VAMP7 and VAMP8 are required for activation-induced degranulation in primary human mast cells; both SNAREs translocate to the plasma membrane and interact with SNAP-23 and STX-4 upon activation, whereas VAMP2 and VAMP3 knockdown did not inhibit IgE receptor-mediated histamine release.","method":"SNARE inhibition (specific approaches), co-immunoprecipitation, histamine release assay, translocation assay in primary human intestinal mast cells","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating SNARE complex formation plus functional secretion assay; single lab","pmids":["18253931"],"is_preprint":false},{"year":2009,"finding":"VAMP3 mediates fusion of MVBs with autophagosomes to form amphisomes, whereas VAMP7 mediates the subsequent fusion of amphisomes/autophagosomes with lysosomes to complete autophagy. VAMP7 and NSF also participate in MVB fusion with the plasma membrane to release exosomes.","method":"siRNA knockdown of VAMP3 or VAMP7 in K562 cells, morphological and biochemical autophagy assays, exosome secretion assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined autophagy/exosome readouts; single lab","pmids":["19781582"],"is_preprint":false},{"year":2009,"finding":"TI-VAMP/VAMP7 interacts with Varp (a Rab21 GEF) through a specific interacting domain (ID); Varp, TI-VAMP, and Rab21 co-localize in the perinuclear region and in transport vesicles of differentiating hippocampal neurons. Silencing Varp or expressing the ID or GEF-dead Varp impairs neurite growth, while a GTP-hydrolysis-defective Rab21 mutant enhances it.","method":"Co-immunoprecipitation, siRNA knockdown, dominant-negative expression, neurite growth assay, colocalization in hippocampal neurons","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus multiple functional perturbations; single lab","pmids":["19745841"],"is_preprint":false},{"year":2009,"finding":"A SNARE complex containing VAMP7 and Vti1a defines a novel non-conventional trafficking pathway to the cell surface used by KChIP1 and Kv4 potassium channels; siRNA knockdown of Vti1a or VAMP7 inhibited Kv4/KChIP1 surface delivery without affecting VSVG conventional trafficking.","method":"siRNA knockdown, surface delivery assay, colocalization, comparison with VSVG conventional trafficking","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with selective cargo assay; single lab, two orthogonal approaches","pmids":["19138172"],"is_preprint":false},{"year":2010,"finding":"VAMP7/TI-VAMP adopts a preferentially closed conformation in solution, where the SNARE helix folds back onto the longin domain, as established by NMR backbone resonance assignments, chemical shift perturbation analysis, and hydrogen/deuterium exchange experiments.","method":"NMR spectroscopy (backbone resonance assignment, chemical shift perturbation, H/D exchange)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural study with multiple orthogonal NMR methods; single lab but rigorous structural characterization","pmids":["20378544"],"is_preprint":false},{"year":2010,"finding":"TI-VAMP/VAMP7 depletion enhances clathrin-dependent endocytosis of activated EGFR by reducing cell-surface CD82 (a tetraspanin that controls EGFR microdomain localization); TI-VAMP-positive vesicles transport CD82 from the Golgi to the cell surface, and its loss restrains EGFR diffusion and impairs MAPK signaling.","method":"siRNA depletion, quantum dot single-particle tracking, co-immunoprecipitation, Golgi-to-surface secretion assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with single-molecule tracking and secretion assay; single lab, multiple methods","pmids":["20144992"],"is_preprint":false},{"year":2011,"finding":"VAMP7 controls exocytosis of proteolipid protein (PLP) from late endosomal/lysosomal organelles as part of a transcytosis pathway in oligodendrocytes; siRNA silencing and dominant-negative expression reduced PLP at the cell surface and at myelin-like membranes in co-culture with neurons. AP-3δ-deficient mocha mice with VAMP7 missorting show mild dysmyelination with reduced PLP levels.","method":"siRNA knockdown, dominant-negative expression, co-culture with cortical neurons, AP-3δ-deficient mouse model analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD plus DN expression plus in vivo mouse model; single lab","pmids":["21490207"],"is_preprint":false},{"year":2011,"finding":"VAMP4 and VAMP7 both colocalize with lytic granules in NK cells during cytotoxic interactions; only VAMP7 associates with perforin-containing granules in resting cells. Disruption of either VAMP4 or VAMP7 inhibits lytic granule exocytosis and NK cytotoxic activity, but only VAMP7 is required for IFN-γ secretion.","method":"siRNA knockdown in YTS and primary NK cells, cytotoxicity assay, granule exocytosis assay, IFN-γ secretion assay, colocalization","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with multiple functional readouts in two NK cell models; single lab","pmids":["21805468"],"is_preprint":false},{"year":2011,"finding":"VAMP7 knockout mice show reduced neurite outgrowth in cultured hippocampal neurons, but lysosomal exocytosis was not affected in mutant fibroblasts, and apical protein localization in kidney/intestine was normal, demonstrating a selective role in neuronal axon extension.","method":"VAMP7 knockout mouse generation, neurite outgrowth assay, lysosomal exocytosis assay, immunohistochemistry in vivo","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive knockout mouse with multiple cellular phenotype assays; negative results also established (lysosomal exocytosis, epithelial polarity unaffected)","pmids":["21740490"],"is_preprint":false},{"year":2012,"finding":"Varp binds directly to VAMP7, trapping its SNARE motif between Varp's second ankyrin repeat domain and the VAMP7 longin domain, thereby kinetically inhibiting VAMP7 SNARE complex formation; this inhibition is increased when Varp simultaneously binds Rab32-GTP on the same membrane.","method":"Crystal structure of Varp ankyrin repeat domain 2 in complex with VAMP7 cytosolic portion, co-immunoprecipitation, SNARE complex formation assay","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with Co-IP and functional SNARE inhibition assay; single rigorous study with multiple orthogonal methods","pmids":["23104059"],"is_preprint":false},{"year":2012,"finding":"Varp interacts with GolginA4 and kinesin 1 (Kif5A), and activated Rab21-GTP binds MACF1, an actin/microtubule regulator that is itself a GolginA4 partner; these components are collectively required for directed anterograde movement of TI-VAMP/VAMP7 vesicles from the cell center to the periphery.","method":"Co-immunoprecipitation, siRNA knockdown, live-cell imaging of VAMP7 vesicle dynamics","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction network plus functional siRNA-based transport assay; single lab","pmids":["22705394"],"is_preprint":false},{"year":2012,"finding":"TI-VAMP/VAMP7 is the vesicular SNARE that mediates secretory lysosome exocytosis in astrocytes, contributing to ATP and cathepsin B release; downregulation of TI-VAMP inhibited ATP-storing vesicle fusion, ATP-mediated calcium wave propagation, and cathepsin B secretion from glioma cells.","method":"siRNA knockdown, live-cell Ca2+ imaging, ATP secretion assay, cathepsin B secretion assay","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with multiple secretion readouts; single lab","pmids":["22188132"],"is_preprint":false},{"year":2012,"finding":"VAMP7 mediates ATP release from autophagic vesicles to the extracellular space; upon starvation, VAMP7-positive/LC3-positive vesicles redistribute to the cell periphery in a microtubule-, KIF5-, and RAB7/RILP-dependent manner and fuse with the plasma membrane to release ATP.","method":"siRNA knockdown, colocalization, ATP secretion assay, microtubule depolymerization, live-cell imaging","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional siRNA KD with defined secretion readout and multiple components tested; single lab","pmids":["22951367"],"is_preprint":false},{"year":2012,"finding":"VAMP7 knockout mice show increased anxiety behavior and decreased brain weight, with increased third ventricle volume; axon growth appeared normal in knockout cultured neurons, suggesting compensatory mechanisms and an unexpected role of TI-VAMP-mediated vesicular traffic in anxiety.","method":"Constitutive VAMP7 knockout mouse (exon 3 deletion), behavioral characterization, neuroanatomical analysis, cultured neuron axon growth assay","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — constitutive KO mouse with behavioral phenotyping; single lab, phenotype without full molecular mechanism","pmids":["22323709"],"is_preprint":false},{"year":2012,"finding":"The AP-3 δ-adaptin subunit linker binds the VAMP7 longin domain; the crystal structure shows the interaction requires VAMP7 SNARE motif engagement in a SNARE complex. Mutation of binding residues on either partner abolishes interaction in vitro and in vivo, and abolishes VAMP7 rescue of its mislocalization in mocha (δ-adaptin-null) fibroblasts.","method":"Crystal structure of δ-adaptin linker–VAMP7 longin domain complex, site-directed mutagenesis, in vivo mislocalization rescue assay in mocha fibroblasts","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis validated in vitro and in vivo; single rigorous study, multiple orthogonal methods","pmids":["22521722"],"is_preprint":false},{"year":2013,"finding":"VAMP7 is required for the recruitment and phosphorylation of Lat-containing vesicles to TCR-activation sites during T cell activation; VAMP7 silencing (by siRNA and in VAMP7-knockout mice) blocked Lat vesicle recruitment without requiring vesicle–plasma membrane fusion, impaired Lat phosphorylation, TCR-Lat signaling complex formation, and T cell activation.","method":"siRNA silencing, VAMP7-knockout mice, live-cell imaging, phospho-Lat biochemistry, T cell activation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse plus siRNA with mechanistic biochemical (phospho-Lat) and imaging readouts; replicated with two independent loss-of-function approaches","pmids":["23666293"],"is_preprint":false},{"year":2013,"finding":"Reelin selectively enhances spontaneous (but not evoked) neurotransmitter release via a presynaptic mechanism requiring VAMP7 and SNAP-25 but not synaptobrevin2, VAMP4, or vti1a; the effect requires a modest ApoER2-dependent increase in presynaptic Ca2+.","method":"Genetic perturbation (VAMP7 knockout, shRNA knockdown of specific SNAREs), electrophysiology, presynaptic Ca2+ imaging","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus selective SNARE knockdowns with electrophysiological readout; VAMP7 specificity established by exclusion of other SNAREs","pmids":["24210904"],"is_preprint":false},{"year":2013,"finding":"hVps41 and VAMP7 function in a parallel, direct TGN-to-late endosome transport pathway for LAMP-1 and LAMP-2, distinct from clathrin/M6PR-dependent lysosomal enzyme trafficking; knockdown of hVps41 or VAMP7 caused accumulation of LAMP carriers, while knockdown of hVps39 or hVps18 did not, indicating hVps41 acts independently of CORVET/HOPS.","method":"siRNA knockdown, immunoelectron microscopy of endogenous LAMP carriers, LAMP-1-mGFP trafficking assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunoelectron microscopy of endogenous carriers plus selective siRNA knockdown with epistasis (Vps39/Vps18 negative controls); multiple orthogonal methods","pmids":["23322049"],"is_preprint":false},{"year":2013,"finding":"TI-VAMP/VAMP7 exocytosis is activated by c-Src kinase-mediated phosphorylation of tyrosine 45 in the Longin domain; a Y45E phosphomimetic mutant activates both t-SNARE binding and exocytosis, whereas Y45F does not, establishing phosphorylation as a molecular switch relieving Longin domain autoinhibition.","method":"In vitro kinase assay with c-Src, site-directed mutagenesis (Y45E and Y45F), SNARE complex formation assay, exocytosis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro phosphorylation assay with mutagenesis and functional SNARE/exocytosis readouts; single rigorous study with multiple orthogonal methods","pmids":["23471971"],"is_preprint":false},{"year":2014,"finding":"VAMP7 co-localizes with estrogen receptor α (ESR1) in the presence of 17β-estradiol; elevated VAMP7 levels intensify ESR1-potentiated transcriptional activity by increasing ESR1 protein cellular content upon ligand stimulation, upregulating estrogen-responsive genes (ATF3, CYR61, CTGF) and causing urogenital development defects.","method":"Transgenic mouse (human VAMP7 BAC), co-localization experiments, transcriptional reporter assays, gene expression analysis","journal":"Nature medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse plus transcriptional assays; single lab, mechanism of ESR1 stabilization partially mechanistic","pmids":["24880616"],"is_preprint":false},{"year":2014,"finding":"SNAP23, Syntaxin4, and VAMP7 form a SNARE complex at invadopodia during tumor cell invasion; coimmunoprecipitation showed increased SNAP23-Syntaxin4-VAMP7 association during invadopodium formation, which correlated with decreased Syntaxin4 phosphorylation. Blocking these SNAREs perturbed MT1-MMP delivery, ECM degradation, and cell invasion.","method":"Co-immunoprecipitation, SNARE function blockade, invadopodium ECM degradation assay, invasion assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP showing complex formation plus functional blockade; single lab","pmids":["24807903"],"is_preprint":false},{"year":2015,"finding":"VAMP7-deficient platelets show partial defects in dense granule and α-granule exocytosis and impaired spreading on matrices; VAMP7 co-immunoprecipitates with VARP and Arp2/3, and these proteins colocalize at the platelet periphery during spreading, suggesting VAMP7 links granule exocytosis with actin reorganization via the VARP–Arp2/3 axis.","method":"VAMP7-knockout mouse platelets, granule exocytosis assay, aggregation assay, spreading assay, co-immunoprecipitation of VAMP7–VARP–Arp2/3","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse with multiple functional readouts plus Co-IP identifying molecular partners; single lab, multiple methods","pmids":["25999457"],"is_preprint":false},{"year":2015,"finding":"Apical exocytosis of NHE3, CFTR, and GLUT5 in polarized epithelial cells requires a cascade involving Rab11, Myo5B, Slp4a, Munc18-2, and Vamp7 with Stx3; CRISPR/genome-edited Myo5B mutation disrupts this pathway selectively, while brush border enzymes localize normally.","method":"CRISPR/genome editing of Myo5B in human epithelial cells, cargo-selective exocytosis assay, colocalization and interaction studies","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with cargo-selective phenotype; interaction cascade defined by epistasis; single lab","pmids":["26553929"],"is_preprint":false},{"year":2015,"finding":"VAMP7-positive lysosome-like vesicles interact with the Salmonella-containing vacuole (SCV) to promote Salmonella-induced filament formation and bacterial growth within the late SCV, as identified by quantitative proteomics of the SCV at defined time points post-invasion.","method":"Quantitative proteomics of isolated SCVs, functional follow-up with VAMP7-positive vesicle interaction assay","journal":"Cellular microbiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proteomics identification plus descriptive interaction; functional mechanism not deeply dissected for VAMP7 specifically","pmids":["26084942"],"is_preprint":false},{"year":2016,"finding":"VAMP7 mediates constitutive transport of TRPM8 channel to the plasma membrane via atypical LAMP1-positive, non-acidic vesicles; VAMP7-deficient mice exhibit reduced TRPM8 functional expression in sensory neurons and concomitant deficits in cold avoidance and icilin-induced cold hypersensitivity.","method":"VAMP7-knockout mouse, live-cell imaging of TRPM8 vesicles, patch-clamp electrophysiology, cold avoidance behavioral assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse with in vitro vesicle imaging, electrophysiology, and in vivo behavioral readouts; multiple orthogonal methods","pmids":["26843440"],"is_preprint":false},{"year":2016,"finding":"VAMP7 regulates autophagy to maintain mitochondrial homeostasis and control glucose-stimulated insulin secretion in pancreatic β-cells; β-cell-specific VAMP7 KO mice show defective autophagosome formation, accumulation of p62 on mitochondria, reduced ATP production, and impaired insulin secretion, which worsens on high-fat diet.","method":"β-cell-specific VAMP7 knockout mouse (Vamp7flox/Y;Cre), autophagy flux assay, mitochondrial function assay, glucose-stimulated insulin secretion","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple mechanistic readouts (autophagy, mitochondria, secretion); single lab, rigorous in vivo model","pmids":["26953164"],"is_preprint":false},{"year":2016,"finding":"VAMP7-null dendritic cells show impaired multidirectional IL-12 secretion and complete failure of directed IL-12 release at the immune synapse; IL-12 localizes in VAMP7-positive late endocytic vesicles, and VAMP7-mediated release at the immune synapse drives T cell effector function acquisition.","method":"VAMP7-knockout mouse DCs, IL-12 secretion assay (ELISA), live-cell imaging of IL-12 vesicles at immune synapse, T cell activation assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse with multiple secretion and immune function readouts; single lab, multiple methods","pmids":["26972013"],"is_preprint":false},{"year":2016,"finding":"BLOC-1 regulates formation of tubular transport carriers delivering VAMP7 and TYRP1 cargo to melanosomes, while BLOC-3 (via its exchange factor activity toward RAB38) is required for formation of distinct VAMP7 recycling carriers from melanosomes that also contain VARP; these two pathways explain distinct hypopigmentation phenotypes in BLOC-1 and BLOC-3 deficiency.","method":"Live-cell imaging, siRNA knockdown of BLOC-1 and BLOC-3 components, colocalization, VAMP7 trafficking assay in melanocytes","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus siRNA epistasis; single lab with multiple approaches","pmids":["27482051"],"is_preprint":false},{"year":2017,"finding":"Vamp7 is associated with Lamp-1+ lysosomal vesicles at the B-cell immune synapse; Vamp7 knockdown impairs local lysosomal secretion at the synapse without affecting lysosome transport to the interface, resulting in defective antigen extraction, processing, and MHC-II presentation.","method":"siRNA knockdown, live-cell imaging, lysosome secretion assay at immune synapse, antigen presentation assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with multiple mechanistic readouts; single lab","pmids":["28179460"],"is_preprint":false},{"year":2017,"finding":"Spastin KO in cortical neurons enhances the anterograde velocity of VAMP7-containing vesicles (but not VAMP2 vesicles) via increased acetylated tubulin levels that enhance kinesin-1 motor activity; pharmacological tubulin hyperacetylation recapitulates the VAMP7 axonal dynamics phenotype.","method":"SPG4 (spastin) KO neurons, live-cell imaging of VAMP7 and VAMP2 vesicles, tubulin acetylation analysis, pharmacological tubulin stabilization","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO neurons with quantitative vesicle dynamics; single lab","pmids":["28392418"],"is_preprint":false},{"year":2018,"finding":"VAMP7 forms a ciliary targeting complex with Rab11 and Rab8 (binding to the VAMP7 longin domain), Rabin8 (interacting with the SNARE domain), and FIP3 (regulating VAMP7 access to Rab11); at the ciliary base, VAMP7 forms a complex with syntaxin 3 and SNAP-25, and the R-SNARE motif of VAMP7 is critical for intracellular trafficking.","method":"Co-immunoprecipitation of VAMP7 with Rab11/Rab8/Rabin8/FIP3, transgenic animal expression of VAMP7 mutants (ΔGFP-VAMP7, Y45E, R150E), colocalization with ciliary cargo rhodopsin","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction mapping plus transgenic animal mutant expression; single lab","pmids":["30404838"],"is_preprint":false},{"year":2018,"finding":"VAMP7 in pancreatic β-cells localizes in Atg9a-resident vesicles at recycling endosomes and interacts with Hrb, Syntaxin16, and SNAP-47; Hrb recruits VAMP7 and Atg9a from plasma membrane to recycling endosomes, while Syntaxin16/SNAP-47 mediate autophagosome formation, forming a SNARE complex required for autophagy.","method":"VAMP7-deficient β-cells, Min6 cell siRNA knockdown, co-immunoprecipitation, colocalization, autophagy assay","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO cells plus Co-IP identifying partners; single lab, multiple methods","pmids":["30215699"],"is_preprint":false},{"year":2018,"finding":"LRRK1 binds the VAMP7 Longin domain and negatively regulates VAMP7-mediated lysosomal secretion; VARP positively controls the peripheral pool of secretory lysosomes; LRRK1 and VARP compete for VAMP7 binding. VAMP7-deficient cells are impaired in adaptation to substrate rigidity, and more rigid substrates stimulate VAMP7-mediated secretion in a Longin domain-dependent manner.","method":"Atomic force microscopy, co-immunoprecipitation of VAMP7-LRRK1 and VAMP7-VARP, VAMP7 KO cells, secretion assays on substrates of different rigidity","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP competition assay plus AFM biomechanical measurements; single lab, multiple methods","pmids":["30240735"],"is_preprint":false},{"year":2019,"finding":"VAMP7 forms a SNARE complex with Syntaxin11 and SNAP-23 at the plasma membrane of human cytotoxic T lymphocytes and co-localizes with granule markers throughout T cell maturation; VAMP7 knockdown significantly reduces CTL killing efficiency without impairing early TCR signaling.","method":"siRNA knockdown, co-immunoprecipitation, live-cell imaging, cytotoxicity assay in primary human T cells","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying SNARE complex plus siRNA KD with functional killing assay; single lab","pmids":["31447853"],"is_preprint":false},{"year":2019,"finding":"DIPK2A, a late endosome/lysosome-localized protein, binds VAMP7B (a SNARE-domain-disrupted isoform of VAMP7), relieving the competitive inhibition VAMP7B exerts on STX17 binding to functional VAMP7A, thereby enhancing autophagosome-lysosome fusion and autophagic degradation.","method":"Co-immunoprecipitation, siRNA knockdown, autophagy flux assay, apoptosis assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying VAMP7B-DIPK2A-STX17 interactions plus functional KD; single lab","pmids":["31251111"],"is_preprint":false},{"year":2020,"finding":"VAMP7-dependent secretion of Reticulon 3 (RTN3) regulates neurite growth; VAMP7 KO neuronal secretomes contain less RTN3, expression of the inhibitory VAMP7 Longin domain disrupts RTN3 subcellular localization in neurons, and a nanobody against VAMP7 inhibits axonal overgrowth induced by nutrient restriction, connecting autophagy-related secretion to neurite growth.","method":"VAMP7 KO secretome mass spectrometry, Longin domain expression, anti-VAMP7 nanobody, conditioned medium experiments, ATG5 KO","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO secretome plus multiple independent perturbations; single lab, multiple methods","pmids":["33357422"],"is_preprint":false},{"year":2023,"finding":"Celastrol directly binds VAMP7 (and RAB7) as confirmed by Surface Plasmon Resonance; overexpression of VAMP7 blocks celastrol's inhibitory effects on autophagosome-lysosome fusion and apoptosis induction in preadipocytes.","method":"Surface Plasmon Resonance, overexpression rescue, autophagy flux assay, apoptosis assay","journal":"Frontiers in pharmacology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — SPR direct binding measurement plus rescue of overexpression; single lab, two methods","pmids":["36959859"],"is_preprint":false},{"year":2023,"finding":"VAMP7j (a human-specific splice isoform lacking the SNARE motif but retaining longin and transmembrane domains) modulates neurite outgrowth in SH-SY5Y cells by mediating L1CAM transport to the plasma membrane in a manner regulated by longin domain phosphorylation.","method":"Isoform-specific overexpression, L1CAM surface trafficking assay, phosphomimetic/phospho-null mutations, immunofluorescence","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, overexpression in cell line with indirect transport assay; no KO or reconstitution","pmids":["38139155"],"is_preprint":false},{"year":2023,"finding":"VAMP7 specifically co-distributes with CCL2-containing granules (but not TNFα- or histamine-containing granules) in bone marrow-derived mast cells, and VAMP7 knockdown markedly reduces CCL2 secretion after antigen stimulation, revealing VAMP7-dependent heterogeneous secretory regulation.","method":"siRNA knockdown, immunocytochemistry, confocal microscopy, CCL2 ELISA after antigen stimulation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with quantitative secretion assay plus compartment-specific colocalization; single lab","pmids":["38029541"],"is_preprint":false},{"year":2026,"finding":"VAMP7 knockout glioblastoma cells show impaired secretion of ER- and mitochondrial-derived proteins and signs of organellar stress; in a preclinical rat glioblastoma model, VAMP7 KO tumors are more necrotic with reduced macrophage infiltration, suggesting VAMP7-dependent late endosomal secretion serves as an organelle quality-control and stress-communication mechanism.","method":"VAMP7 KO cell lines, secretome proteomics, organellar stress markers, in vivo rat glioblastoma model, macrophage infiltration analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO secretome proteomics plus in vivo tumor model; single lab, multiple methods","pmids":["41723185"],"is_preprint":false}],"current_model":"VAMP7 (TI-VAMP/SYBL1) is a longin-family v-SNARE that adopts a closed autoinhibited conformation via intramolecular interaction of its N-terminal Longin domain with its SNARE motif; relief of this autoinhibition—by c-Src-mediated tyrosine-45 phosphorylation, Varp displacement, or SNARE complex engagement—enables VAMP7 to assemble into distinct SNARE complexes (with Syntaxin 7/Vti1b/Syntaxin 8 for late endosome–lysosome fusion; with Syntaxin 3/SNAP-25 at the cilium/apical membrane; with Syntaxin 11/SNAP-23 for cytotoxic granule exocytosis; with STX-12/SNAP-23 at the MVB–plasma membrane interface) to drive membrane fusion in multiple pathways including late endosomal–lysosomal fusion, lysosomal secretion, phagocytosis, neurite outgrowth, autophagosome–lysosome fusion, exosome release, ion channel delivery, immune cell degranulation, and unconventional secretion of ER/mitochondrial stress proteins; the Longin domain additionally serves as a sorting determinant recognized by AP-3 (δ-adaptin) and the clathrin adaptor Hrb for recycling, and by Varp/LRRK1 for regulated peripheral trafficking."},"narrative":{"mechanistic_narrative":"VAMP7 (TI-VAMP/SYBL1) is a longin-family vesicular SNARE that drives membrane fusion across multiple late endosomal–lysosomal and unconventional secretory pathways [PMID:10459012, PMID:10888671]. Its activity is gated by its N-terminal Longin domain, which folds back onto the SNARE helix to adopt a preferentially closed, autoinhibited conformation in solution [PMID:20378544]; this domain inhibits SNARE complex assembly, and its removal increases SNARE pairing and potently stimulates VAMP7-dependent membrane fusion such as neurite outgrowth [PMID:10811829]. Autoinhibition is relieved physiologically by c-Src–mediated phosphorylation of tyrosine 45 in the Longin domain, which activates t-SNARE binding and exocytosis [PMID:23471971], and is reinforced by Varp, whose ankyrin repeat domain traps the VAMP7 SNARE motif against the Longin domain to kinetically block complex formation [PMID:23104059]. Once activated, VAMP7 assembles into compartment-specific SNARE complexes—with Syntaxin 7/Vti1b/Syntaxin 8 for late endosome–lysosome fusion [PMID:12175335, PMID:15133481], and with SNAP-23/syntaxin partners at the plasma membrane for regulated secretion in immune and tumor cells [PMID:18253931, PMID:24807903, PMID:31447853]. Through these complexes VAMP7 executes late endosome-to-lysosome transport [PMID:10459012, PMID:10888671], lysosomal and secretory-granule exocytosis underlying phagocytosis, immune-cell degranulation and cytokine release [PMID:15470500, PMID:21805468, PMID:26972013], autophagosome–lysosome fusion [PMID:19781582, PMID:26953164], cell-surface delivery of selected cargoes including ion channels [PMID:26843440], and neuronal axon extension [PMID:21740490]. The Longin domain additionally serves as a sorting platform recognized by the AP-3 δ-adaptin subunit and the clathrin adaptor Hrb to direct VAMP7 recycling and endocytic retrieval, interactions whose structural basis has been defined by crystallography [PMID:18775314, PMID:22521722]. VAMP7 knockout mice establish selective in vivo roles in neurite outgrowth, anxiety behavior, sensory cold detection, and β-cell autophagy and insulin secretion [PMID:21740490, PMID:22323709, PMID:26843440, PMID:26953164].","teleology":[{"year":1999,"claim":"Established that VAMP7 is a late endosomal/lysosomal SNARE functionally required for endosome-to-lysosome transport, defining its core trafficking role.","evidence":"Antibody inhibition of EGFR degradation in streptolysin-O-permeabilized cells with immunoEM localization to LAMP-1 compartments","pmids":["10459012"],"confidence":"High","gaps":["Did not identify cognate t-SNARE partners","No reconstitution of fusion with defined components"]},{"year":2000,"claim":"Reconstituted VAMP7 function in cell-free assays and revealed Longin-domain autoinhibition, answering how VAMP7 drives fusion and how it is regulated.","evidence":"Dominant-negative recombinant VAMP7 fragment in cell-free macrophage fusion assays; isolated Longin domain blocking SNAP-25 association and neurite outgrowth in PC12 cells","pmids":["10888671","10811829"],"confidence":"High","gaps":["Structural basis of Longin autoinhibition not yet defined","Physiological trigger for relief of autoinhibition unknown"]},{"year":2002,"claim":"Identified the compartment-specific Q-SNARE partners of VAMP7, defining the molecular composition of the late endosomal fusion machinery.","evidence":"Co-IP/MS and reciprocal Co-IP in Dictyostelium and mammalian cells identifying Syntaxin 7/Vti1b/Syntaxin 8; antibody inhibition in rat liver cell-free systems distinguishing VAMP7 vs VAMP8 usage","pmids":["12175335","11278762","15133481"],"confidence":"High","gaps":["How partner choice is regulated in cells not resolved","Combinatorial logic between VAMP7 and VAMP8 left open"]},{"year":2004,"claim":"Extended VAMP7 function to professional secretory and surface-delivery processes, showing it serves multiple regulated exocytic pathways beyond housekeeping fusion.","evidence":"siRNA and dominant-negative Longin-domain perturbations in macrophage phagocytosis and L6 myoblast GLUT4 surface assays","pmids":["15470500","15469990"],"confidence":"High","gaps":["Distinct vesicle pools not molecularly distinguished","Upstream signaling to VAMP7 vesicles unknown"]},{"year":2008,"claim":"Defined the structural basis for Longin-domain sorting, showing the clathrin adaptor Hrb recognizes VAMP7 to drive its endocytosis, linking conformational state to trafficking.","evidence":"Crystal structure of Hrb–VAMP7 Longin domain complex with mutagenesis and cell-surface VAMP7 quantification","pmids":["18775314"],"confidence":"High","gaps":["In vivo regulation of Hrb recruitment unaddressed","Coupling of cis-SNARE state to retrieval rate not quantified"]},{"year":2010,"claim":"Directly demonstrated the closed autoinhibited conformation of VAMP7 in solution, confirming the regulatory model inferred from functional studies.","evidence":"NMR backbone assignment, chemical shift perturbation, and H/D exchange of full-length VAMP7","pmids":["20378544"],"confidence":"High","gaps":["Dynamics of the open–closed transition on membranes not measured","Effectors that shift the equilibrium not all defined"]},{"year":2012,"claim":"Defined the molecular switches controlling VAMP7 activation and sorting, showing Varp kinetically locks the closed state and AP-3 δ-adaptin reads the SNARE-engaged state for sorting.","evidence":"Crystal structures of Varp-ankyrin–VAMP7 and δ-adaptin-linker–VAMP7 complexes with mutagenesis and in vivo mocha-fibroblast rescue; Co-IP transport-network mapping (Varp/GolginA4/Kif5A/MACF1)","pmids":["23104059","22521722","22705394"],"confidence":"High","gaps":["How Varp release is triggered in cells not established","Coordination of sorting and motility steps left open"]},{"year":2013,"claim":"Identified c-Src phosphorylation of Tyr45 as the activating molecular switch relieving Longin autoinhibition, and extended VAMP7 function to T-cell signaling and TGN-to-endosome LAMP transport.","evidence":"In vitro c-Src kinase assay with Y45E/Y45F mutants and SNARE/exocytosis readouts; VAMP7 KO/siRNA with phospho-Lat biochemistry; siRNA epistasis with hVps41 and immunoEM of LAMP carriers","pmids":["23471971","23666293","23322049"],"confidence":"High","gaps":["Upstream signals controlling c-Src–VAMP7 axis in each pathway unresolved","How VAMP7 supports vesicle recruitment independent of fusion not fully mechanistic"]},{"year":2016,"claim":"Genetic KO mice established selective, non-redundant in vivo roles of VAMP7 in sensory cold detection and β-cell autophagy/insulin secretion, distinguishing physiological pathways from compensable ones.","evidence":"VAMP7 KO and β-cell-specific conditional KO mice with vesicle imaging, electrophysiology, behavior, autophagy flux, and insulin secretion assays","pmids":["26843440","26953164","21740490"],"confidence":"High","gaps":["Compensation by other R-SNAREs in unaffected tissues not characterized","Tissue-specific SNARE partner usage in vivo not mapped"]},{"year":2018,"claim":"Resolved how VAMP7 is targeted to specialized destinations, defining ciliary and recycling-endosome targeting complexes and competing regulators of the secretory-lysosome pool.","evidence":"Co-IP mapping of VAMP7 with Rab11/Rab8/Rabin8/FIP3 and Hrb/Syntaxin16/SNAP-47; LRRK1–VARP competition assays with AFM rigidity-sensing readouts","pmids":["30404838","30215699","30240735"],"confidence":"Medium","gaps":["Structural basis of ciliary-complex binding not solved","How mechanical cues converge on Longin-domain regulation unclear"]},{"year":2026,"claim":"Implicated VAMP7-dependent unconventional secretion in organelle stress communication and tumor biology, broadening its role to quality-control signaling.","evidence":"VAMP7 KO glioblastoma secretome proteomics and in vivo rat glioblastoma model","pmids":["41723185"],"confidence":"Medium","gaps":["Mechanism coupling organellar stress to VAMP7 secretion undefined","Identity of the SNARE complex for ER/mitochondrial protein release not established"]},{"year":null,"claim":"How the multiple regulatory inputs (Tyr45 phosphorylation, Varp/LRRK1 competition, mechanical cues, Rab GTPases) are integrated to select among the many VAMP7-dependent fusion pathways in a given cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of pathway selection","Quantitative contribution of each regulator in vivo unknown","Cell-type-specific partner switching not systematically mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,3,6,8]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,34]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,25,48]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,2,27,44]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,5,33]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[16,36,40,49]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,4,28,42]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[17,28,41,50]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,2,33]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[9,23,42,27]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[14,16,23,31,42,49]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,24,51]}],"complexes":["VAMP7–Syntaxin 7–Vti1b–Syntaxin 8 (late endosome–lysosome SNARE)","VAMP7–Syntaxin 3–SNAP-25 (ciliary/apical SNARE)","VAMP7–Syntaxin 11–SNAP-23 (cytotoxic granule SNARE)","VAMP7–SNAP-23–Syntaxin 4 (invadopodia/mast cell SNARE)"],"partners":["STX7","VTI1B","SNAP23","STX3","VARP","LRRK1","AP3D1","HRB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P51809","full_name":"Vesicle-associated membrane protein 7","aliases":["Synaptobrevin-like protein 1","Tetanus-insensitive VAMP","Ti-VAMP"],"length_aa":220,"mass_kda":24.9,"function":"Involved in the targeting and/or fusion of transport vesicles to their target membrane during transport of proteins from the early endosome to the lysosome. Required for heterotypic fusion of late endosomes with lysosomes and homotypic lysosomal fusion. Required for calcium regulated lysosomal exocytosis. Involved in the export of chylomicrons from the endoplasmic reticulum to the cis Golgi. Required for exocytosis of mediators during eosinophil and neutrophil degranulation, and target cell killing by natural killer cells. Required for focal exocytosis of late endocytic vesicles during phagosome formation","subcellular_location":"Cytoplasmic vesicle, secretory vesicle membrane; Golgi apparatus, trans-Golgi network membrane; Late endosome membrane; Lysosome membrane; Endoplasmic reticulum membrane; Cytoplasmic vesicle, phagosome membrane; Synapse, synaptosome","url":"https://www.uniprot.org/uniprotkb/P51809/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VAMP7","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ATP6AP1","stoichiometry":10.0},{"gene":"ARL8B","stoichiometry":0.2},{"gene":"ATP6V0A1","stoichiometry":0.2},{"gene":"LAMP1","stoichiometry":0.2},{"gene":"RAB11A","stoichiometry":0.2},{"gene":"RAB7A","stoichiometry":0.2},{"gene":"SCAMP1","stoichiometry":0.2},{"gene":"SPG21","stoichiometry":0.2},{"gene":"STX12","stoichiometry":0.2},{"gene":"VAMP3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/VAMP7","total_profiled":1310},"omim":[{"mim_id":"620963","title":"ZDHHC PALMITOYLTRANSFERASE 18; ZDHHC18","url":"https://www.omim.org/entry/620963"},{"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":"618957","title":"ANKYRIN REPEAT DOMAIN-CONTAINING PROTEIN 27; ANKRD27","url":"https://www.omim.org/entry/618957"},{"mim_id":"614316","title":"VESICLE TRANSPORT THROUGH INTERACTION WITH T-SNARES 1A; VTI1A","url":"https://www.omim.org/entry/614316"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VAMP7"},"hgnc":{"alias_symbol":["VAMP-7","TI-VAMP"],"prev_symbol":["SYBL1"]},"alphafold":{"accession":"P51809","domains":[{"cath_id":"3.30.450.50","chopping":"2-169","consensus_level":"high","plddt":87.1685,"start":2,"end":169},{"cath_id":"1.20.5","chopping":"170-220","consensus_level":"medium","plddt":75.5582,"start":170,"end":220}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51809","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51809-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51809-F1-predicted_aligned_error_v6.png","plddt_mean":84.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VAMP7","jax_strain_url":"https://www.jax.org/strain/search?query=VAMP7"},"sequence":{"accession":"P51809","fasta_url":"https://rest.uniprot.org/uniprotkb/P51809.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51809/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51809"}},"corpus_meta":[{"pmid":"19781582","id":"PMC_19781582","title":"TI-VAMP/VAMP7 and VAMP3/cellubrevin: two v-SNARE proteins involved in specific steps of the autophagy/multivesicular body pathways.","date":"2009","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/19781582","citation_count":395,"is_preprint":false},{"pmid":"15133481","id":"PMC_15133481","title":"Combinatorial SNARE complexes with VAMP7 or VAMP8 define different late endocytic fusion events.","date":"2004","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/15133481","citation_count":219,"is_preprint":false},{"pmid":"10811829","id":"PMC_10811829","title":"Role of tetanus neurotoxin insensitive vesicle-associated membrane protein (TI-VAMP) in vesicular transport mediating neurite outgrowth.","date":"2000","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/10811829","citation_count":181,"is_preprint":false},{"pmid":"10459012","id":"PMC_10459012","title":"VAMP-7 mediates vesicular transport from endosomes to 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lysosomes.\",\n      \"method\": \"Monoclonal/polyclonal antibody generation, immunohistochemistry, immunoelectron microscopy, streptolysin-O permeabilized cell transport assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional antibody inhibition in reconstituted permeabilized cell system, replicated across multiple labs in subsequent work\",\n      \"pmids\": [\"10459012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In neurons, VAMP7/TI-VAMP localizes to a novel membrane compartment distinct from synaptic vesicles and large dense-core granules, concentrating in the leading edge of growth cones before synaptogenesis, suggesting a specialized exocytic vesicle pool for neurite outgrowth.\",\n      \"method\": \"Subcellular fractionation, immunoelectron microscopy, immunofluorescence in hippocampal neurons and PC12 cells\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunoelectron microscopy with functional inference; single lab, multiple imaging methods\",\n      \"pmids\": [\"10559389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"VAMP7 is required for late endosome-lysosome and homotypic lysosome fusion in alveolar macrophages; a soluble dominant-negative VAMP7 fragment (lacking transmembrane domain) inhibited both heterotypic late endosome-lysosome fusion and homotypic lysosome fusion in an in vitro cell-free fusion assay.\",\n      \"method\": \"In vitro cell-free fusion assay with dominant-negative bacterially-expressed VAMP7 fragment\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstituted fusion assay with recombinant dominant-negative protein; replicated across labs\",\n      \"pmids\": [\"10888671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"VAMP7/TI-VAMP is essential for vesicular transport mediating neurite outgrowth in staurosporine-differentiated PC12 cells; the N-terminal Longin domain inhibits association with SNAP-25, and expression of this domain blocks neurite outgrowth as potently as Botulinum neurotoxin E (which cleaves SNAP-25), while deletion of the Longin domain increases SNARE complex formation and strongly stimulates neurite outgrowth.\",\n      \"method\": \"Dominant-negative N-terminal domain expression, co-immunoprecipitation of SNARE complexes, neurite outgrowth assay in PC12 cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional domain dissection with gain- and loss-of-function, SNARE complex co-IP, replicated in subsequent studies\",\n      \"pmids\": [\"10811829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"In RBL-2H3 mast cells, VAMP7 localizes exclusively in granule membranes (not plasma membrane); upon antigen stimulation, VAMP7-positive granules move to the cell surface via fusion with the plasma membrane, suggesting VAMP7 mediates degranulation.\",\n      \"method\": \"RT-PCR, GFP-fusion protein live imaging, confocal microscopy\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — live-cell imaging with GFP constructs, single lab, no functional blockade experiment\",\n      \"pmids\": [\"10777677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Syntaxin 7 forms SNARE complexes with either VAMP7 or VAMP8 (together with Syntaxin 6 and mVti1b) in B16 melanoma cells, as identified by large-scale Syntaxin 7 immunoprecipitation followed by mass spectrometry, indicating combinatorial SNARE assembly in the late endosomal pathway.\",\n      \"method\": \"Immunoaffinity purification, electrospray mass spectrometry, immunoblotting, immunofluorescence colocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — large-scale Co-IP with mass spectrometry identification; single lab, no functional reconstitution\",\n      \"pmids\": [\"11278762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In Dictyostelium discoideum, VAMP7 forms an active SNARE complex with Syntaxin 7, Vti1 and Syntaxin 8 in endosomes; co-immunoprecipitation and MS identified these partners, and soluble recombinant VAMP7 fragment inhibited in vitro reconstituted endosome fusion.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry peptide sequencing, in vitro endosome fusion assay with recombinant VAMP7 fragment\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted fusion assay with inhibitory recombinant VAMP7 fragment plus Co-IP/MS complex identification; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12175335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ectopic expression of the plasma membrane t-SNARE syntaxin 1 in the ER redirects TI-VAMP/VAMP7 (and cellubrevin) to the ER in a microtubule-dependent manner, and TI-VAMP associates in vivo with exogenous syntaxin 1, demonstrating that the destination of v-SNAREs is driven by specific interactions with cognate t-SNAREs.\",\n      \"method\": \"Ectopic expression, co-immunoprecipitation, immunofluorescence, microtubule depolymerization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo Co-IP and functional redistribution experiments; single lab, two orthogonal methods\",\n      \"pmids\": [\"12759369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The Q-SNAREs syntaxin 7, Vti1b, and syntaxin 8 can pair with either VAMP8 (for homotypic late endosome fusion) or VAMP7 (for heterotypic late endosome–lysosome fusion), as shown by antibody inhibition in rat liver cell-free fusion systems and separate co-immunoprecipitation of syntaxin 7 complexes with VAMP7 or VAMP8. Overexpression of the VAMP7 N-terminal domain in fibroblasts inhibited mixing of lysosomal and late endosomal content markers.\",\n      \"method\": \"Antibody inhibition in rat liver cell-free fusion assay, co-immunoprecipitation, dominant-negative N-terminal domain overexpression, content-mixing assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cell-free fusion reconstitution with antibody inhibition, reciprocal Co-IP, dominant-negative cell experiments; multiple orthogonal methods\",\n      \"pmids\": [\"15133481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TI-VAMP/VAMP7 mediates late endocytic compartment exocytosis required for optimal Fc receptor- and complement receptor-mediated phagocytosis in macrophages; dominant-negative Longin domain expression and siRNA depletion of TI-VAMP blocked pseudopod extension and phagosome sealing.\",\n      \"method\": \"Dominant-negative domain expression, siRNA knockdown, scanning electron microscopy, exocytosis assays in macrophages\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent loss-of-function approaches (DN domain + siRNA) with defined phenotypic readout; replicated across multiple cell types and receptor types\",\n      \"pmids\": [\"15470500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Hypertonicity-stimulated GLUT4 recruitment to the muscle cell surface is dependent on TI-VAMP/VAMP7 (but not VAMP2), as shown by siRNA knockdown of TI-VAMP reducing basal and hypertonicity-stimulated surface GLUT4; insulin stimulation was only partly reduced, indicating TI-VAMP and VAMP2 mediate GLUT4 trafficking from distinct pools.\",\n      \"method\": \"siRNA knockdown, surface GLUT4myc quantification, dominant-negative NSF expression in L6 myoblasts\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with quantitative surface receptor assay; single lab, two conditions tested\",\n      \"pmids\": [\"15469990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cdc42 and F-actin control the polarized accumulation and exocytosis of TI-VAMP/VAMP7-containing vesicles in hippocampal neuron growth cones; dominant-positive Cdc42 stimulates TI-VAMP exocytosis in an actin-dependent manner, as measured by pHLuorin-tagged TI-VAMP fluorescence.\",\n      \"method\": \"Dominant-positive Cdc42 expression, pHLuorin exocytosis assay, actin disruption, immunofluorescence in hippocampal neurons\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional pHLuorin exocytosis assay with genetic perturbation; single lab, multiple methods\",\n      \"pmids\": [\"16381811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TI-VAMP/VAMP7 is insensitive to botulinum neurotoxin B due to at least 12 amino acid differences from VAMP-2 scattered along a 22-residue interface; replacement of specific residues (including Ile158, Thr161, and section 165-174) with VAMP-2 equivalents progressively restored cleavability.\",\n      \"method\": \"In vitro cleavage assays with chimeric VAMP7/VAMP2 hybrid proteins and point mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic in vitro mutagenesis with enzymatic cleavage assay; single lab with comprehensive mutant series\",\n      \"pmids\": [\"16430921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The Longin domain of TI-VAMP/VAMP7 has dual biochemical functions: it inhibits SNARE complex formation and binds to the δ subunit of AP-3, targeting TI-VAMP to late endosomes. Expression of the isolated Longin domain disrupts AP-3δ localization, impairs lysosomal secretion, blocks membrane repair after wounding, and inhibits epithelial cell migration.\",\n      \"method\": \"Inducible Longin domain expression in MDCK cells, immunofluorescence, lysosomal secretion assay, wound healing assay, electron microscopy\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative approach with multiple functional readouts; single lab\",\n      \"pmids\": [\"17288539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"VAMP7 is required for granzyme B release and target cell killing in NK cell line YT-Indy; siRNA knockdown of VAMP7 reduced granzyme B secretion to <1 ng/mL compared to 1.5-2.5 μg/mL in controls and caused a 7-fold reduction in NK cell-mediated Jurkat killing.\",\n      \"method\": \"siRNA knockdown, granzyme B secretion assay, cytotoxicity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with quantitative secretion and killing assays; single lab\",\n      \"pmids\": [\"18042464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Clathrin-mediated endocytosis of VAMP7 is directly mediated by the ArfGAP/clathrin adaptor Hrb, which wraps 20 residues of its unstructured C-terminal tail around the VAMP7 longin domain; disrupting this interaction causes VAMP7 accumulation at the cell surface. The VAMP7 SNARE helix can fold back onto the longin domain to compete with Hrb, suggesting Hrb-mediated endocytosis occurs preferentially when VAMP7 is in a cis-SNARE complex.\",\n      \"method\": \"Crystal structure of Hrb-VAMP7 longin domain complex, site-directed mutagenesis, Hrb depletion, cell surface VAMP7 quantification\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis validation in cells; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"18775314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VAMP7 and VAMP8 are required for activation-induced degranulation in primary human mast cells; both SNAREs translocate to the plasma membrane and interact with SNAP-23 and STX-4 upon activation, whereas VAMP2 and VAMP3 knockdown did not inhibit IgE receptor-mediated histamine release.\",\n      \"method\": \"SNARE inhibition (specific approaches), co-immunoprecipitation, histamine release assay, translocation assay in primary human intestinal mast cells\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating SNARE complex formation plus functional secretion assay; single lab\",\n      \"pmids\": [\"18253931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"VAMP3 mediates fusion of MVBs with autophagosomes to form amphisomes, whereas VAMP7 mediates the subsequent fusion of amphisomes/autophagosomes with lysosomes to complete autophagy. VAMP7 and NSF also participate in MVB fusion with the plasma membrane to release exosomes.\",\n      \"method\": \"siRNA knockdown of VAMP3 or VAMP7 in K562 cells, morphological and biochemical autophagy assays, exosome secretion assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined autophagy/exosome readouts; single lab\",\n      \"pmids\": [\"19781582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TI-VAMP/VAMP7 interacts with Varp (a Rab21 GEF) through a specific interacting domain (ID); Varp, TI-VAMP, and Rab21 co-localize in the perinuclear region and in transport vesicles of differentiating hippocampal neurons. Silencing Varp or expressing the ID or GEF-dead Varp impairs neurite growth, while a GTP-hydrolysis-defective Rab21 mutant enhances it.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, dominant-negative expression, neurite growth assay, colocalization in hippocampal neurons\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus multiple functional perturbations; single lab\",\n      \"pmids\": [\"19745841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A SNARE complex containing VAMP7 and Vti1a defines a novel non-conventional trafficking pathway to the cell surface used by KChIP1 and Kv4 potassium channels; siRNA knockdown of Vti1a or VAMP7 inhibited Kv4/KChIP1 surface delivery without affecting VSVG conventional trafficking.\",\n      \"method\": \"siRNA knockdown, surface delivery assay, colocalization, comparison with VSVG conventional trafficking\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with selective cargo assay; single lab, two orthogonal approaches\",\n      \"pmids\": [\"19138172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"VAMP7/TI-VAMP adopts a preferentially closed conformation in solution, where the SNARE helix folds back onto the longin domain, as established by NMR backbone resonance assignments, chemical shift perturbation analysis, and hydrogen/deuterium exchange experiments.\",\n      \"method\": \"NMR spectroscopy (backbone resonance assignment, chemical shift perturbation, H/D exchange)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural study with multiple orthogonal NMR methods; single lab but rigorous structural characterization\",\n      \"pmids\": [\"20378544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TI-VAMP/VAMP7 depletion enhances clathrin-dependent endocytosis of activated EGFR by reducing cell-surface CD82 (a tetraspanin that controls EGFR microdomain localization); TI-VAMP-positive vesicles transport CD82 from the Golgi to the cell surface, and its loss restrains EGFR diffusion and impairs MAPK signaling.\",\n      \"method\": \"siRNA depletion, quantum dot single-particle tracking, co-immunoprecipitation, Golgi-to-surface secretion assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with single-molecule tracking and secretion assay; single lab, multiple methods\",\n      \"pmids\": [\"20144992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP7 controls exocytosis of proteolipid protein (PLP) from late endosomal/lysosomal organelles as part of a transcytosis pathway in oligodendrocytes; siRNA silencing and dominant-negative expression reduced PLP at the cell surface and at myelin-like membranes in co-culture with neurons. AP-3δ-deficient mocha mice with VAMP7 missorting show mild dysmyelination with reduced PLP levels.\",\n      \"method\": \"siRNA knockdown, dominant-negative expression, co-culture with cortical neurons, AP-3δ-deficient mouse model analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD plus DN expression plus in vivo mouse model; single lab\",\n      \"pmids\": [\"21490207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP4 and VAMP7 both colocalize with lytic granules in NK cells during cytotoxic interactions; only VAMP7 associates with perforin-containing granules in resting cells. Disruption of either VAMP4 or VAMP7 inhibits lytic granule exocytosis and NK cytotoxic activity, but only VAMP7 is required for IFN-γ secretion.\",\n      \"method\": \"siRNA knockdown in YTS and primary NK cells, cytotoxicity assay, granule exocytosis assay, IFN-γ secretion assay, colocalization\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with multiple functional readouts in two NK cell models; single lab\",\n      \"pmids\": [\"21805468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP7 knockout mice show reduced neurite outgrowth in cultured hippocampal neurons, but lysosomal exocytosis was not affected in mutant fibroblasts, and apical protein localization in kidney/intestine was normal, demonstrating a selective role in neuronal axon extension.\",\n      \"method\": \"VAMP7 knockout mouse generation, neurite outgrowth assay, lysosomal exocytosis assay, immunohistochemistry in vivo\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive knockout mouse with multiple cellular phenotype assays; negative results also established (lysosomal exocytosis, epithelial polarity unaffected)\",\n      \"pmids\": [\"21740490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Varp binds directly to VAMP7, trapping its SNARE motif between Varp's second ankyrin repeat domain and the VAMP7 longin domain, thereby kinetically inhibiting VAMP7 SNARE complex formation; this inhibition is increased when Varp simultaneously binds Rab32-GTP on the same membrane.\",\n      \"method\": \"Crystal structure of Varp ankyrin repeat domain 2 in complex with VAMP7 cytosolic portion, co-immunoprecipitation, SNARE complex formation assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with Co-IP and functional SNARE inhibition assay; single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"23104059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Varp interacts with GolginA4 and kinesin 1 (Kif5A), and activated Rab21-GTP binds MACF1, an actin/microtubule regulator that is itself a GolginA4 partner; these components are collectively required for directed anterograde movement of TI-VAMP/VAMP7 vesicles from the cell center to the periphery.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, live-cell imaging of VAMP7 vesicle dynamics\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction network plus functional siRNA-based transport assay; single lab\",\n      \"pmids\": [\"22705394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TI-VAMP/VAMP7 is the vesicular SNARE that mediates secretory lysosome exocytosis in astrocytes, contributing to ATP and cathepsin B release; downregulation of TI-VAMP inhibited ATP-storing vesicle fusion, ATP-mediated calcium wave propagation, and cathepsin B secretion from glioma cells.\",\n      \"method\": \"siRNA knockdown, live-cell Ca2+ imaging, ATP secretion assay, cathepsin B secretion assay\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with multiple secretion readouts; single lab\",\n      \"pmids\": [\"22188132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VAMP7 mediates ATP release from autophagic vesicles to the extracellular space; upon starvation, VAMP7-positive/LC3-positive vesicles redistribute to the cell periphery in a microtubule-, KIF5-, and RAB7/RILP-dependent manner and fuse with the plasma membrane to release ATP.\",\n      \"method\": \"siRNA knockdown, colocalization, ATP secretion assay, microtubule depolymerization, live-cell imaging\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional siRNA KD with defined secretion readout and multiple components tested; single lab\",\n      \"pmids\": [\"22951367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VAMP7 knockout mice show increased anxiety behavior and decreased brain weight, with increased third ventricle volume; axon growth appeared normal in knockout cultured neurons, suggesting compensatory mechanisms and an unexpected role of TI-VAMP-mediated vesicular traffic in anxiety.\",\n      \"method\": \"Constitutive VAMP7 knockout mouse (exon 3 deletion), behavioral characterization, neuroanatomical analysis, cultured neuron axon growth assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — constitutive KO mouse with behavioral phenotyping; single lab, phenotype without full molecular mechanism\",\n      \"pmids\": [\"22323709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The AP-3 δ-adaptin subunit linker binds the VAMP7 longin domain; the crystal structure shows the interaction requires VAMP7 SNARE motif engagement in a SNARE complex. Mutation of binding residues on either partner abolishes interaction in vitro and in vivo, and abolishes VAMP7 rescue of its mislocalization in mocha (δ-adaptin-null) fibroblasts.\",\n      \"method\": \"Crystal structure of δ-adaptin linker–VAMP7 longin domain complex, site-directed mutagenesis, in vivo mislocalization rescue assay in mocha fibroblasts\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis validated in vitro and in vivo; single rigorous study, multiple orthogonal methods\",\n      \"pmids\": [\"22521722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VAMP7 is required for the recruitment and phosphorylation of Lat-containing vesicles to TCR-activation sites during T cell activation; VAMP7 silencing (by siRNA and in VAMP7-knockout mice) blocked Lat vesicle recruitment without requiring vesicle–plasma membrane fusion, impaired Lat phosphorylation, TCR-Lat signaling complex formation, and T cell activation.\",\n      \"method\": \"siRNA silencing, VAMP7-knockout mice, live-cell imaging, phospho-Lat biochemistry, T cell activation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse plus siRNA with mechanistic biochemical (phospho-Lat) and imaging readouts; replicated with two independent loss-of-function approaches\",\n      \"pmids\": [\"23666293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Reelin selectively enhances spontaneous (but not evoked) neurotransmitter release via a presynaptic mechanism requiring VAMP7 and SNAP-25 but not synaptobrevin2, VAMP4, or vti1a; the effect requires a modest ApoER2-dependent increase in presynaptic Ca2+.\",\n      \"method\": \"Genetic perturbation (VAMP7 knockout, shRNA knockdown of specific SNAREs), electrophysiology, presynaptic Ca2+ imaging\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus selective SNARE knockdowns with electrophysiological readout; VAMP7 specificity established by exclusion of other SNAREs\",\n      \"pmids\": [\"24210904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"hVps41 and VAMP7 function in a parallel, direct TGN-to-late endosome transport pathway for LAMP-1 and LAMP-2, distinct from clathrin/M6PR-dependent lysosomal enzyme trafficking; knockdown of hVps41 or VAMP7 caused accumulation of LAMP carriers, while knockdown of hVps39 or hVps18 did not, indicating hVps41 acts independently of CORVET/HOPS.\",\n      \"method\": \"siRNA knockdown, immunoelectron microscopy of endogenous LAMP carriers, LAMP-1-mGFP trafficking assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — immunoelectron microscopy of endogenous carriers plus selective siRNA knockdown with epistasis (Vps39/Vps18 negative controls); multiple orthogonal methods\",\n      \"pmids\": [\"23322049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TI-VAMP/VAMP7 exocytosis is activated by c-Src kinase-mediated phosphorylation of tyrosine 45 in the Longin domain; a Y45E phosphomimetic mutant activates both t-SNARE binding and exocytosis, whereas Y45F does not, establishing phosphorylation as a molecular switch relieving Longin domain autoinhibition.\",\n      \"method\": \"In vitro kinase assay with c-Src, site-directed mutagenesis (Y45E and Y45F), SNARE complex formation assay, exocytosis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro phosphorylation assay with mutagenesis and functional SNARE/exocytosis readouts; single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"23471971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VAMP7 co-localizes with estrogen receptor α (ESR1) in the presence of 17β-estradiol; elevated VAMP7 levels intensify ESR1-potentiated transcriptional activity by increasing ESR1 protein cellular content upon ligand stimulation, upregulating estrogen-responsive genes (ATF3, CYR61, CTGF) and causing urogenital development defects.\",\n      \"method\": \"Transgenic mouse (human VAMP7 BAC), co-localization experiments, transcriptional reporter assays, gene expression analysis\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic mouse plus transcriptional assays; single lab, mechanism of ESR1 stabilization partially mechanistic\",\n      \"pmids\": [\"24880616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SNAP23, Syntaxin4, and VAMP7 form a SNARE complex at invadopodia during tumor cell invasion; coimmunoprecipitation showed increased SNAP23-Syntaxin4-VAMP7 association during invadopodium formation, which correlated with decreased Syntaxin4 phosphorylation. Blocking these SNAREs perturbed MT1-MMP delivery, ECM degradation, and cell invasion.\",\n      \"method\": \"Co-immunoprecipitation, SNARE function blockade, invadopodium ECM degradation assay, invasion assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing complex formation plus functional blockade; single lab\",\n      \"pmids\": [\"24807903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VAMP7-deficient platelets show partial defects in dense granule and α-granule exocytosis and impaired spreading on matrices; VAMP7 co-immunoprecipitates with VARP and Arp2/3, and these proteins colocalize at the platelet periphery during spreading, suggesting VAMP7 links granule exocytosis with actin reorganization via the VARP–Arp2/3 axis.\",\n      \"method\": \"VAMP7-knockout mouse platelets, granule exocytosis assay, aggregation assay, spreading assay, co-immunoprecipitation of VAMP7–VARP–Arp2/3\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse with multiple functional readouts plus Co-IP identifying molecular partners; single lab, multiple methods\",\n      \"pmids\": [\"25999457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Apical exocytosis of NHE3, CFTR, and GLUT5 in polarized epithelial cells requires a cascade involving Rab11, Myo5B, Slp4a, Munc18-2, and Vamp7 with Stx3; CRISPR/genome-edited Myo5B mutation disrupts this pathway selectively, while brush border enzymes localize normally.\",\n      \"method\": \"CRISPR/genome editing of Myo5B in human epithelial cells, cargo-selective exocytosis assay, colocalization and interaction studies\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with cargo-selective phenotype; interaction cascade defined by epistasis; single lab\",\n      \"pmids\": [\"26553929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VAMP7-positive lysosome-like vesicles interact with the Salmonella-containing vacuole (SCV) to promote Salmonella-induced filament formation and bacterial growth within the late SCV, as identified by quantitative proteomics of the SCV at defined time points post-invasion.\",\n      \"method\": \"Quantitative proteomics of isolated SCVs, functional follow-up with VAMP7-positive vesicle interaction assay\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proteomics identification plus descriptive interaction; functional mechanism not deeply dissected for VAMP7 specifically\",\n      \"pmids\": [\"26084942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VAMP7 mediates constitutive transport of TRPM8 channel to the plasma membrane via atypical LAMP1-positive, non-acidic vesicles; VAMP7-deficient mice exhibit reduced TRPM8 functional expression in sensory neurons and concomitant deficits in cold avoidance and icilin-induced cold hypersensitivity.\",\n      \"method\": \"VAMP7-knockout mouse, live-cell imaging of TRPM8 vesicles, patch-clamp electrophysiology, cold avoidance behavioral assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse with in vitro vesicle imaging, electrophysiology, and in vivo behavioral readouts; multiple orthogonal methods\",\n      \"pmids\": [\"26843440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VAMP7 regulates autophagy to maintain mitochondrial homeostasis and control glucose-stimulated insulin secretion in pancreatic β-cells; β-cell-specific VAMP7 KO mice show defective autophagosome formation, accumulation of p62 on mitochondria, reduced ATP production, and impaired insulin secretion, which worsens on high-fat diet.\",\n      \"method\": \"β-cell-specific VAMP7 knockout mouse (Vamp7flox/Y;Cre), autophagy flux assay, mitochondrial function assay, glucose-stimulated insulin secretion\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple mechanistic readouts (autophagy, mitochondria, secretion); single lab, rigorous in vivo model\",\n      \"pmids\": [\"26953164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VAMP7-null dendritic cells show impaired multidirectional IL-12 secretion and complete failure of directed IL-12 release at the immune synapse; IL-12 localizes in VAMP7-positive late endocytic vesicles, and VAMP7-mediated release at the immune synapse drives T cell effector function acquisition.\",\n      \"method\": \"VAMP7-knockout mouse DCs, IL-12 secretion assay (ELISA), live-cell imaging of IL-12 vesicles at immune synapse, T cell activation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse with multiple secretion and immune function readouts; single lab, multiple methods\",\n      \"pmids\": [\"26972013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BLOC-1 regulates formation of tubular transport carriers delivering VAMP7 and TYRP1 cargo to melanosomes, while BLOC-3 (via its exchange factor activity toward RAB38) is required for formation of distinct VAMP7 recycling carriers from melanosomes that also contain VARP; these two pathways explain distinct hypopigmentation phenotypes in BLOC-1 and BLOC-3 deficiency.\",\n      \"method\": \"Live-cell imaging, siRNA knockdown of BLOC-1 and BLOC-3 components, colocalization, VAMP7 trafficking assay in melanocytes\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus siRNA epistasis; single lab with multiple approaches\",\n      \"pmids\": [\"27482051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Vamp7 is associated with Lamp-1+ lysosomal vesicles at the B-cell immune synapse; Vamp7 knockdown impairs local lysosomal secretion at the synapse without affecting lysosome transport to the interface, resulting in defective antigen extraction, processing, and MHC-II presentation.\",\n      \"method\": \"siRNA knockdown, live-cell imaging, lysosome secretion assay at immune synapse, antigen presentation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with multiple mechanistic readouts; single lab\",\n      \"pmids\": [\"28179460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Spastin KO in cortical neurons enhances the anterograde velocity of VAMP7-containing vesicles (but not VAMP2 vesicles) via increased acetylated tubulin levels that enhance kinesin-1 motor activity; pharmacological tubulin hyperacetylation recapitulates the VAMP7 axonal dynamics phenotype.\",\n      \"method\": \"SPG4 (spastin) KO neurons, live-cell imaging of VAMP7 and VAMP2 vesicles, tubulin acetylation analysis, pharmacological tubulin stabilization\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO neurons with quantitative vesicle dynamics; single lab\",\n      \"pmids\": [\"28392418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VAMP7 forms a ciliary targeting complex with Rab11 and Rab8 (binding to the VAMP7 longin domain), Rabin8 (interacting with the SNARE domain), and FIP3 (regulating VAMP7 access to Rab11); at the ciliary base, VAMP7 forms a complex with syntaxin 3 and SNAP-25, and the R-SNARE motif of VAMP7 is critical for intracellular trafficking.\",\n      \"method\": \"Co-immunoprecipitation of VAMP7 with Rab11/Rab8/Rabin8/FIP3, transgenic animal expression of VAMP7 mutants (ΔGFP-VAMP7, Y45E, R150E), colocalization with ciliary cargo rhodopsin\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction mapping plus transgenic animal mutant expression; single lab\",\n      \"pmids\": [\"30404838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VAMP7 in pancreatic β-cells localizes in Atg9a-resident vesicles at recycling endosomes and interacts with Hrb, Syntaxin16, and SNAP-47; Hrb recruits VAMP7 and Atg9a from plasma membrane to recycling endosomes, while Syntaxin16/SNAP-47 mediate autophagosome formation, forming a SNARE complex required for autophagy.\",\n      \"method\": \"VAMP7-deficient β-cells, Min6 cell siRNA knockdown, co-immunoprecipitation, colocalization, autophagy assay\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO cells plus Co-IP identifying partners; single lab, multiple methods\",\n      \"pmids\": [\"30215699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LRRK1 binds the VAMP7 Longin domain and negatively regulates VAMP7-mediated lysosomal secretion; VARP positively controls the peripheral pool of secretory lysosomes; LRRK1 and VARP compete for VAMP7 binding. VAMP7-deficient cells are impaired in adaptation to substrate rigidity, and more rigid substrates stimulate VAMP7-mediated secretion in a Longin domain-dependent manner.\",\n      \"method\": \"Atomic force microscopy, co-immunoprecipitation of VAMP7-LRRK1 and VAMP7-VARP, VAMP7 KO cells, secretion assays on substrates of different rigidity\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP competition assay plus AFM biomechanical measurements; single lab, multiple methods\",\n      \"pmids\": [\"30240735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VAMP7 forms a SNARE complex with Syntaxin11 and SNAP-23 at the plasma membrane of human cytotoxic T lymphocytes and co-localizes with granule markers throughout T cell maturation; VAMP7 knockdown significantly reduces CTL killing efficiency without impairing early TCR signaling.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, live-cell imaging, cytotoxicity assay in primary human T cells\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying SNARE complex plus siRNA KD with functional killing assay; single lab\",\n      \"pmids\": [\"31447853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DIPK2A, a late endosome/lysosome-localized protein, binds VAMP7B (a SNARE-domain-disrupted isoform of VAMP7), relieving the competitive inhibition VAMP7B exerts on STX17 binding to functional VAMP7A, thereby enhancing autophagosome-lysosome fusion and autophagic degradation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, autophagy flux assay, apoptosis assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying VAMP7B-DIPK2A-STX17 interactions plus functional KD; single lab\",\n      \"pmids\": [\"31251111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VAMP7-dependent secretion of Reticulon 3 (RTN3) regulates neurite growth; VAMP7 KO neuronal secretomes contain less RTN3, expression of the inhibitory VAMP7 Longin domain disrupts RTN3 subcellular localization in neurons, and a nanobody against VAMP7 inhibits axonal overgrowth induced by nutrient restriction, connecting autophagy-related secretion to neurite growth.\",\n      \"method\": \"VAMP7 KO secretome mass spectrometry, Longin domain expression, anti-VAMP7 nanobody, conditioned medium experiments, ATG5 KO\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO secretome plus multiple independent perturbations; single lab, multiple methods\",\n      \"pmids\": [\"33357422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Celastrol directly binds VAMP7 (and RAB7) as confirmed by Surface Plasmon Resonance; overexpression of VAMP7 blocks celastrol's inhibitory effects on autophagosome-lysosome fusion and apoptosis induction in preadipocytes.\",\n      \"method\": \"Surface Plasmon Resonance, overexpression rescue, autophagy flux assay, apoptosis assay\",\n      \"journal\": \"Frontiers in pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — SPR direct binding measurement plus rescue of overexpression; single lab, two methods\",\n      \"pmids\": [\"36959859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VAMP7j (a human-specific splice isoform lacking the SNARE motif but retaining longin and transmembrane domains) modulates neurite outgrowth in SH-SY5Y cells by mediating L1CAM transport to the plasma membrane in a manner regulated by longin domain phosphorylation.\",\n      \"method\": \"Isoform-specific overexpression, L1CAM surface trafficking assay, phosphomimetic/phospho-null mutations, immunofluorescence\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, overexpression in cell line with indirect transport assay; no KO or reconstitution\",\n      \"pmids\": [\"38139155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VAMP7 specifically co-distributes with CCL2-containing granules (but not TNFα- or histamine-containing granules) in bone marrow-derived mast cells, and VAMP7 knockdown markedly reduces CCL2 secretion after antigen stimulation, revealing VAMP7-dependent heterogeneous secretory regulation.\",\n      \"method\": \"siRNA knockdown, immunocytochemistry, confocal microscopy, CCL2 ELISA after antigen stimulation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with quantitative secretion assay plus compartment-specific colocalization; single lab\",\n      \"pmids\": [\"38029541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"VAMP7 knockout glioblastoma cells show impaired secretion of ER- and mitochondrial-derived proteins and signs of organellar stress; in a preclinical rat glioblastoma model, VAMP7 KO tumors are more necrotic with reduced macrophage infiltration, suggesting VAMP7-dependent late endosomal secretion serves as an organelle quality-control and stress-communication mechanism.\",\n      \"method\": \"VAMP7 KO cell lines, secretome proteomics, organellar stress markers, in vivo rat glioblastoma model, macrophage infiltration analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO secretome proteomics plus in vivo tumor model; single lab, multiple methods\",\n      \"pmids\": [\"41723185\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VAMP7 (TI-VAMP/SYBL1) is a longin-family v-SNARE that adopts a closed autoinhibited conformation via intramolecular interaction of its N-terminal Longin domain with its SNARE motif; relief of this autoinhibition—by c-Src-mediated tyrosine-45 phosphorylation, Varp displacement, or SNARE complex engagement—enables VAMP7 to assemble into distinct SNARE complexes (with Syntaxin 7/Vti1b/Syntaxin 8 for late endosome–lysosome fusion; with Syntaxin 3/SNAP-25 at the cilium/apical membrane; with Syntaxin 11/SNAP-23 for cytotoxic granule exocytosis; with STX-12/SNAP-23 at the MVB–plasma membrane interface) to drive membrane fusion in multiple pathways including late endosomal–lysosomal fusion, lysosomal secretion, phagocytosis, neurite outgrowth, autophagosome–lysosome fusion, exosome release, ion channel delivery, immune cell degranulation, and unconventional secretion of ER/mitochondrial stress proteins; the Longin domain additionally serves as a sorting determinant recognized by AP-3 (δ-adaptin) and the clathrin adaptor Hrb for recycling, and by Varp/LRRK1 for regulated peripheral trafficking.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VAMP7 (TI-VAMP/SYBL1) is a longin-family vesicular SNARE that drives membrane fusion across multiple late endosomal–lysosomal and unconventional secretory pathways [#0, #2]. Its activity is gated by its N-terminal Longin domain, which folds back onto the SNARE helix to adopt a preferentially closed, autoinhibited conformation in solution [#20]; this domain inhibits SNARE complex assembly, and its removal increases SNARE pairing and potently stimulates VAMP7-dependent membrane fusion such as neurite outgrowth [#3]. Autoinhibition is relieved physiologically by c-Src–mediated phosphorylation of tyrosine 45 in the Longin domain, which activates t-SNARE binding and exocytosis [#34], and is reinforced by Varp, whose ankyrin repeat domain traps the VAMP7 SNARE motif against the Longin domain to kinetically block complex formation [#25]. Once activated, VAMP7 assembles into compartment-specific SNARE complexes—with Syntaxin 7/Vti1b/Syntaxin 8 for late endosome–lysosome fusion [#6, #8], and with SNAP-23/syntaxin partners at the plasma membrane for regulated secretion in immune and tumor cells [#16, #36, #49]. Through these complexes VAMP7 executes late endosome-to-lysosome transport [#0, #2], lysosomal and secretory-granule exocytosis underlying phagocytosis, immune-cell degranulation and cytokine release [#9, #23, #42], autophagosome–lysosome fusion [#17, #41], cell-surface delivery of selected cargoes including ion channels [#40], and neuronal axon extension [#24]. The Longin domain additionally serves as a sorting platform recognized by the AP-3 δ-adaptin subunit and the clathrin adaptor Hrb to direct VAMP7 recycling and endocytic retrieval, interactions whose structural basis has been defined by crystallography [#15, #30]. VAMP7 knockout mice establish selective in vivo roles in neurite outgrowth, anxiety behavior, sensory cold detection, and β-cell autophagy and insulin secretion [#24, #29, #40, #41].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that VAMP7 is a late endosomal/lysosomal SNARE functionally required for endosome-to-lysosome transport, defining its core trafficking role.\",\n      \"evidence\": \"Antibody inhibition of EGFR degradation in streptolysin-O-permeabilized cells with immunoEM localization to LAMP-1 compartments\",\n      \"pmids\": [\"10459012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify cognate t-SNARE partners\", \"No reconstitution of fusion with defined components\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Reconstituted VAMP7 function in cell-free assays and revealed Longin-domain autoinhibition, answering how VAMP7 drives fusion and how it is regulated.\",\n      \"evidence\": \"Dominant-negative recombinant VAMP7 fragment in cell-free macrophage fusion assays; isolated Longin domain blocking SNAP-25 association and neurite outgrowth in PC12 cells\",\n      \"pmids\": [\"10888671\", \"10811829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Longin autoinhibition not yet defined\", \"Physiological trigger for relief of autoinhibition unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified the compartment-specific Q-SNARE partners of VAMP7, defining the molecular composition of the late endosomal fusion machinery.\",\n      \"evidence\": \"Co-IP/MS and reciprocal Co-IP in Dictyostelium and mammalian cells identifying Syntaxin 7/Vti1b/Syntaxin 8; antibody inhibition in rat liver cell-free systems distinguishing VAMP7 vs VAMP8 usage\",\n      \"pmids\": [\"12175335\", \"11278762\", \"15133481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How partner choice is regulated in cells not resolved\", \"Combinatorial logic between VAMP7 and VAMP8 left open\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended VAMP7 function to professional secretory and surface-delivery processes, showing it serves multiple regulated exocytic pathways beyond housekeeping fusion.\",\n      \"evidence\": \"siRNA and dominant-negative Longin-domain perturbations in macrophage phagocytosis and L6 myoblast GLUT4 surface assays\",\n      \"pmids\": [\"15470500\", \"15469990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinct vesicle pools not molecularly distinguished\", \"Upstream signaling to VAMP7 vesicles unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the structural basis for Longin-domain sorting, showing the clathrin adaptor Hrb recognizes VAMP7 to drive its endocytosis, linking conformational state to trafficking.\",\n      \"evidence\": \"Crystal structure of Hrb–VAMP7 Longin domain complex with mutagenesis and cell-surface VAMP7 quantification\",\n      \"pmids\": [\"18775314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo regulation of Hrb recruitment unaddressed\", \"Coupling of cis-SNARE state to retrieval rate not quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Directly demonstrated the closed autoinhibited conformation of VAMP7 in solution, confirming the regulatory model inferred from functional studies.\",\n      \"evidence\": \"NMR backbone assignment, chemical shift perturbation, and H/D exchange of full-length VAMP7\",\n      \"pmids\": [\"20378544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of the open–closed transition on membranes not measured\", \"Effectors that shift the equilibrium not all defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the molecular switches controlling VAMP7 activation and sorting, showing Varp kinetically locks the closed state and AP-3 δ-adaptin reads the SNARE-engaged state for sorting.\",\n      \"evidence\": \"Crystal structures of Varp-ankyrin–VAMP7 and δ-adaptin-linker–VAMP7 complexes with mutagenesis and in vivo mocha-fibroblast rescue; Co-IP transport-network mapping (Varp/GolginA4/Kif5A/MACF1)\",\n      \"pmids\": [\"23104059\", \"22521722\", \"22705394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Varp release is triggered in cells not established\", \"Coordination of sorting and motility steps left open\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified c-Src phosphorylation of Tyr45 as the activating molecular switch relieving Longin autoinhibition, and extended VAMP7 function to T-cell signaling and TGN-to-endosome LAMP transport.\",\n      \"evidence\": \"In vitro c-Src kinase assay with Y45E/Y45F mutants and SNARE/exocytosis readouts; VAMP7 KO/siRNA with phospho-Lat biochemistry; siRNA epistasis with hVps41 and immunoEM of LAMP carriers\",\n      \"pmids\": [\"23471971\", \"23666293\", \"23322049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals controlling c-Src–VAMP7 axis in each pathway unresolved\", \"How VAMP7 supports vesicle recruitment independent of fusion not fully mechanistic\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genetic KO mice established selective, non-redundant in vivo roles of VAMP7 in sensory cold detection and β-cell autophagy/insulin secretion, distinguishing physiological pathways from compensable ones.\",\n      \"evidence\": \"VAMP7 KO and β-cell-specific conditional KO mice with vesicle imaging, electrophysiology, behavior, autophagy flux, and insulin secretion assays\",\n      \"pmids\": [\"26843440\", \"26953164\", \"21740490\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensation by other R-SNAREs in unaffected tissues not characterized\", \"Tissue-specific SNARE partner usage in vivo not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved how VAMP7 is targeted to specialized destinations, defining ciliary and recycling-endosome targeting complexes and competing regulators of the secretory-lysosome pool.\",\n      \"evidence\": \"Co-IP mapping of VAMP7 with Rab11/Rab8/Rabin8/FIP3 and Hrb/Syntaxin16/SNAP-47; LRRK1–VARP competition assays with AFM rigidity-sensing readouts\",\n      \"pmids\": [\"30404838\", \"30215699\", \"30240735\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of ciliary-complex binding not solved\", \"How mechanical cues converge on Longin-domain regulation unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Implicated VAMP7-dependent unconventional secretion in organelle stress communication and tumor biology, broadening its role to quality-control signaling.\",\n      \"evidence\": \"VAMP7 KO glioblastoma secretome proteomics and in vivo rat glioblastoma model\",\n      \"pmids\": [\"41723185\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling organellar stress to VAMP7 secretion undefined\", \"Identity of the SNARE complex for ER/mitochondrial protein release not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple regulatory inputs (Tyr45 phosphorylation, Varp/LRRK1 competition, mechanical cues, Rab GTPases) are integrated to select among the many VAMP7-dependent fusion pathways in a given cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of pathway selection\", \"Quantitative contribution of each regulator in vivo unknown\", \"Cell-type-specific partner switching not systematically mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 3, 6, 8]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 34]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 25, 48]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 2, 27, 44]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 5, 33]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [16, 36, 40, 49]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 4, 28, 42]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [17, 28, 41, 50]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 33]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9, 23, 42, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 16, 23, 31, 42, 49]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 24, 51]}\n    ],\n    \"complexes\": [\n      \"VAMP7–Syntaxin 7–Vti1b–Syntaxin 8 (late endosome–lysosome SNARE)\",\n      \"VAMP7–Syntaxin 3–SNAP-25 (ciliary/apical SNARE)\",\n      \"VAMP7–Syntaxin 11–SNAP-23 (cytotoxic granule SNARE)\",\n      \"VAMP7–SNAP-23–Syntaxin 4 (invadopodia/mast cell SNARE)\"\n    ],\n    \"partners\": [\n      \"STX7\",\n      \"VTI1B\",\n      \"SNAP23\",\n      \"STX3\",\n      \"VARP\",\n      \"LRRK1\",\n      \"AP3D1\",\n      \"HRB\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}