{"gene":"VAMP2","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1995,"finding":"VAMP-2 is essential for Ca2+-dependent insulin secretion in pancreatic beta-cells. Tetanus toxin and botulinum B neurotoxin selectively cleaved VAMP-2 and cellubrevin in permeabilized beta-cells and abolished Ca2+-induced insulin release (IC50 ~15 nM), but did not prevent GTP-gamma-S-stimulated secretion, demonstrating that VAMP-2 selectively controls the Ca2+-mediated exocytotic pathway.","method":"Tetanus toxin and botulinum B neurotoxin cleavage assay in streptolysin-O permeabilized insulin-secreting cells; subcellular fractionation; confocal microscopy","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic cleavage with neurotoxins plus functional rescue readout; clear mechanistic dissection of Ca2+-dependent vs. GTP-gamma-S pathway","pmids":["7796801"],"is_preprint":false},{"year":1997,"finding":"VAMP2 functions as a vesicle-SNARE (v-SNARE) required for insulin-stimulated GLUT4 translocation to the plasma membrane in adipocytes. Expression of the cytoplasmic domain of VAMP2 inhibited insulin-stimulated GLUT4 but not GLUT1 translocation, and immunoprecipitation of syntaxin 4 cytoplasmic domain co-precipitated GLUT4-containing vesicles in an insulin-stimulated manner.","method":"Recombinant vaccinia virus expression; single-cell microinjection; co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative and co-IP approaches replicated across multiple insulin-responsive systems in several subsequent papers","pmids":["9111311"],"is_preprint":false},{"year":1996,"finding":"VAMP-2 co-localizes with GLUT-4 in a specialized post-endosomal intracellular compartment in adipocytes that is segregated from recycling endosomes (transferrin receptor/cellubrevin-positive). Endosomal ablation with transferrin-HRP/DAB removed >90% of cellubrevin but spared 90% of VAMP-2, and immunoisolated GLUT-4 vesicles contained VAMP-2.","method":"Endosomal ablation (Tf-HRP/DAB), immunoadsorption of vesicles, immuno-electron microscopy, subcellular fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (functional ablation, immuno-EM, immunoisolation) in single study; replicated by subsequent morphological studies","pmids":["8707843"],"is_preprint":false},{"year":1995,"finding":"VAMP2 is expressed on AQP2-containing intracellular vesicles in kidney collecting duct principal cells, as demonstrated by co-immunoprecipitation and double immunolabeling; VAMP2 in kidney membranes is cleaved by tetanus toxin, establishing it as a tetanus-toxin-sensitive SNARE in this tissue. Quantitative immuno-EM showed highly significant co-localization of AQP2 and VAMP2 on the same vesicles (P<0.0001).","method":"Immunoblotting, immunoisolation with anti-VAMP2 antibodies, double immunolabeling immuno-EM, tetanus toxin cleavage","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (immunoisolation, immuno-EM with quantification, tetanus toxin cleavage) in single focused study","pmids":["7560075"],"is_preprint":false},{"year":1998,"finding":"VAMP-2 forms binary, saturable interactions with both syntaxin-4 and SNAP23 in vitro, establishing the non-neuronal SNARE complex for exocytosis. Unlike neuronal SNAP25, SNAP23 did not potentiate VAMP-2 binding to syntaxin-4. PKA phosphorylation of syntaxin-4 (but not casein kinase II) disrupted its binding to SNAP23, indicating phosphorylation-dependent regulation of SNARE complex formation.","method":"In vitro binary binding assay; phosphorylation by exogenous kinases (PKA, CKII, PKC); phosphate incorporation quantification","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro binding with quantification and mutagenesis-equivalent phosphorylation studies; single lab but multiple orthogonal methods","pmids":["9693005"],"is_preprint":false},{"year":1997,"finding":"A dual Rab/VAMP2 receptor protein (PRA1) was identified that specifically binds VAMP2 (but not VAMP1 or cellubrevin); this specificity requires the proline-rich domain and transmembrane domain of VAMP2. The interaction is distinct from VAMP2 binding to syntaxin or syntaxin/SNAP-25, suggesting PRA1 links Rab GTPases and VAMP2 in vesicle docking/fusion control.","method":"Yeast two-hybrid screen; in vitro binding assays; chimeric/deletion mutant analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — yeast two-hybrid plus in vitro binding with multiple deletion and chimeric mutants; single lab","pmids":["9341137"],"is_preprint":false},{"year":2000,"finding":"VAMP2, but not VAMP3/cellubrevin, specifically mediates insulin-dependent GLUT4 translocation in L6 myoblasts. Toxin-resistant VAMP2 rescued tetanus toxin-inhibited GLUT4 translocation, whereas toxin-resistant VAMP3 did not. Insulin caused cortical actin reorganization in which GLUT4 and VAMP2 (but not VAMP3) were clustered.","method":"Tetanus toxin light chain transfection; rescue with toxin-resistant VAMP2/3 constructs; single-cell fluorescence GLUT4 translocation assay; immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific rescue experiment with toxin-resistant constructs plus cellular imaging; replicated across multiple cell systems","pmids":["10888677"],"is_preprint":false},{"year":2000,"finding":"SNAP23 mediates insulin-dependent GLUT4 translocation by acting as a bridging molecule between syntaxin4 (t-SNARE) and VAMP2 (v-SNARE) in 3T3-L1 adipocytes. A SNAP23 mutant (DeltaC8) that bound syntaxin4 but not VAMP2 and failed to mediate the syntaxin4-VAMP2 interaction acted as a dominant negative, blocking insulin-induced GLUT4 translocation.","method":"Adenovirus-mediated overexpression of SNAP23 mutants; in vitro and in vivo co-immunoprecipitation; GLUT4 translocation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-mapping mutants with functional readout in cells plus in vitro binding; two orthogonal methods","pmids":["10713150"],"is_preprint":false},{"year":2003,"finding":"Synaptophysin I (SypI) controls the targeting of VAMP2 to synaptic vesicles through direct protein-protein interaction requiring the cytoplasmic domain of VAMP2. Without SypI co-expression, VAMP2 travels in vesicles that constitutively fuse with the plasma membrane; co-expression of SypI restores correct sorting to SVs in a dose-dependent and VAMP2-specific manner.","method":"Fluorescent chimera expression in hippocampal neurons; live imaging; co-immunoprecipitation; dose-response analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live imaging of trafficking combined with co-IP and dose-dependent functional rescue in primary neurons; single lab","pmids":["14528015"],"is_preprint":false},{"year":2004,"finding":"VAMP2-dependent exocytosis regulates plasma membrane insertion of TRPC3 channels and contributes to agonist-stimulated Ca2+ influx. TRPC3 N-terminus directly interacts with VAMP2; cleavage of VAMP2 by tetanus toxin reduced TRPC3 surface expression and decreased carbachol- and OAG-stimulated (but not thapsigargin-stimulated) Ca2+ influx.","method":"Co-immunoprecipitation; GFP-TRPC3 live imaging; FRAP; tetanus toxin cleavage; Ca2+ influx measurement","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional tetanus toxin cleavage plus live imaging; multiple orthogonal methods in single study","pmids":["15327778"],"is_preprint":false},{"year":2006,"finding":"The 1.65 Å crystal structure of BoNT/D light chain provides molecular details of how VAMP-2 is recognized and cleaved. A hydrophobic pocket recognizes the P1' VAMP-2 residue Leu60, and a second remote site recognizes the V1 SNARE motif. Comparison with BoNT/F-LC (which cleaves VAMP-2 one residue away) showed that BoNT/D uses hydrophobic interactions for V1 motif recognition whereas BoNT/F adopts a hydrophilic strategy.","method":"X-ray crystallography at 1.65 Å resolution; structural comparison","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure with detailed mechanistic analysis of substrate recognition; single study but Tier 1 method","pmids":["16519520"],"is_preprint":false},{"year":2007,"finding":"CALM (clathrin assembly lymphoid myeloid leukemia protein) facilitates endocytosis of VAMP2 from the plasma membrane via its ANTH domain. CALM overexpression reduced surface VAMP2; CALM knockdown by RNAi accumulated surface VAMP2; the ANTH domain alone acted as a dominant-negative, establishing CALM as a specific endocytic adaptor for VAMP2.","method":"Overexpression; RNA interference knockdown; dominant-negative ANTH domain expression; cell surface VAMP2 quantification","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — gain-of-function, loss-of-function, and dominant-negative all showing consistent phenotype; multiple orthogonal approaches","pmids":["18182011"],"is_preprint":false},{"year":2007,"finding":"Synaptophysin I specifies the exocytic pathway of VAMP2 by directing its sorting to vesicles before surface delivery, not by inhibiting VAMP2 endocytosis. Physical interaction between SypI and VAMP2 is required, mediated by the C-terminal domain of SypI. Dynamin and alpha-SNAP mutants blocking trafficking at the plasma membrane did not abolish SypI's effect on VAMP2 sorting.","method":"Ectopic expression in non-neuronal cells; co-immunoprecipitation; dominant-negative dynamin and alpha-SNAP mutants; fluorescence microscopy","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus multiple trafficking mutants; single lab, mechanistic follow-up confirming findings from 2003 paper","pmids":["17331077"],"is_preprint":false},{"year":2007,"finding":"ProF (WD-repeat-propeller-FYVE protein) interacts with VAMP2 and PKCzeta, forming a ternary complex on vesicular membranes. VAMP2 can be phosphorylated by activated PKCzeta in vitro, and ProF acts as an adaptor that increases PKCzeta-dependent phosphorylation of VAMP2 in vitro.","method":"Co-immunoprecipitation of endogenous and overexpressed proteins; in vitro kinase assay; co-localization imaging","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP and in vitro phosphorylation; single lab, single study","pmids":["17313651"],"is_preprint":false},{"year":2008,"finding":"VAMP2 directly interacts with the T1 domain of the N-terminus of Kv2.1 potassium channel and enhances channel inactivation. This interaction was demonstrated in brain membranes and characterized by electrophysiology and in vitro binding; a chimeric Kv1.5N/Kv2.1 channel confirmed the N-terminal T1 domain requirement.","method":"In vitro binding assay; electrophysiology in Xenopus oocytes; co-immunoprecipitation from brain membranes; chimeric channel analysis; protein modeling","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding plus electrophysiology plus brain co-IP plus chimeric domain analysis; multiple orthogonal methods","pmids":["18542995"],"is_preprint":false},{"year":2008,"finding":"Munc18c directly inhibits bilayer fusion mediated by the syntaxin4/SNAP23/VAMP2 SNARE complex in a reconstituted liposome fusion assay, making contacts with both t-SNARE (syntaxin4) and v-SNARE (VAMP2) components.","method":"Reconstituted liposome fusion assay; biochemical binding characterization","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro fusion assay with direct inhibition readout; rigorous reductionist approach; single lab","pmids":["19116655"],"is_preprint":false},{"year":2001,"finding":"PKCzeta, activated by insulin, associates specifically with GLUT4 compartments and induces serine phosphorylation of the GLUT4-compartment-associated VAMP2. Dominant-negative PKCzeta disrupted GLUT4 compartment integrity and abrogated insulin-induced GLUT4 translocation, while active PKCzeta overexpression caused GLUT4 translocation in the absence of insulin.","method":"Adenovirus-mediated overexpression of wild-type and dominant-negative PKCzeta; subcellular fractionation; phosphoserine immunoprecipitation; glucose transport assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function and dominant-negative with biochemical phosphorylation readout; single lab","pmids":["11604519"],"is_preprint":false},{"year":2009,"finding":"The t-SNAREs syntaxin4 and SNAP23 are required for tethering of GLUT4 vesicles to the plasma membrane, whereas v-SNARE VAMP2 is not required for tethering but is essential for the subsequent membrane fusion event. RNAi depletion of VAMP2 inhibited fusion without affecting tethering, while depletion of syntaxin4 or SNAP23 impaired tethering.","method":"RNAi knockdown in 3T3-L1 adipocytes; TIRF microscopy-based vesicle tethering and fusion assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific gene knockdown with TIRF imaging distinguishing tethering vs. fusion steps; two orthogonal knockdowns compared in single study","pmids":["20006577"],"is_preprint":false},{"year":2009,"finding":"The accessory alpha-helix of complexin I (residues 27-48) can locally displace VAMP2 from the C-terminus of the SNARE four-helix bundle, making the complex weaker, but remains detached when the N-terminal region of complexin I (residues 1-26) is present. This suggests the balance between the accessory helix and N-terminal domain determines stimulatory vs. inhibitory complexin function.","method":"EPR spectroscopy of complexin-SNARE quaternary complex; site-directed spin labeling","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — EPR structural analysis with domain deletion; single lab, no functional reconstitution validation","pmids":["20026076"],"is_preprint":false},{"year":2011,"finding":"VAMP2 (but not VAMP3) mediates cAMP-stimulated renin release from juxtaglomerular cells. VAMP2 co-localizes with renin-containing granules, and shRNA silencing of VAMP2 blocked cAMP-induced renin release by ~50% and impaired cAMP-stimulated exocytosis (FM1-43 assay), while VAMP3 silencing had no effect.","method":"Confocal colocalization; adenoviral shRNA knockdown; FM1-43 exocytosis assay; renin secretion measurement; tetanus toxin cleavage","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific VAMP2 vs. VAMP3 knockdown with functional exocytosis readout; multiple methods in single study","pmids":["21708949"],"is_preprint":false},{"year":2013,"finding":"Native alpha-synuclein promotes clustering of synaptic-vesicle mimics through specific interactions with both synaptobrevin-2/VAMP2 and anionic lipids. The lipid-binding-deficient A30P mutant disrupted clustering, while other familial PD mutants did not. Alpha-synuclein had little effect on Ca2+-triggered fusion in this reconstituted single-vesicle system.","method":"Single-vesicle optical microscopy; recombinant and native alpha-synuclein purified from mouse brain; vesicle clustering assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted single-vesicle system with native protein plus multiple mutant analyses; validated with brain-purified protein","pmids":["23638301"],"is_preprint":false},{"year":2013,"finding":"Heat shock factor 1 (HSF1) transcriptional activity mediates alcohol-induced upregulation of Vamp2 (but not Vamp1) expression in mouse cortical neurons. This increased VAMP2 expression leads to increased frequency of GABAergic miniature IPSCs via HSF1, without affecting mEPSCs, establishing a specific presynaptic adaptation in GABAergic terminals.","method":"HSF1 transcription factor manipulation; electrophysiology (mIPSC recording); RT-PCR; pharmacological HSF1 inhibition","journal":"Frontiers in integrative neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus molecular genetic HSF1 manipulation; single lab, two orthogonal readouts","pmids":["24376402"],"is_preprint":false},{"year":2014,"finding":"VAMP2 (but not VAMP3) selectively mediates cAMP-stimulated NKCC2 exocytic delivery and surface expression in renal thick ascending limb cells. NKCC2 co-immunoprecipitates with VAMP2, and PKA activation enhanced VAMP2-NKCC2 co-immunoprecipitation. In vivo silencing of VAMP2 blocked cAMP-stimulated NKCC2 exocytic delivery.","method":"Co-immunoprecipitation; in vivo VAMP2/3 siRNA silencing; surface NKCC2 expression assay; VAMP2 exocytosis assay in renal cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with specific functional readout plus co-IP; isoform-specific dissection (VAMP2 vs. VAMP3)","pmids":["25008321"],"is_preprint":false},{"year":2015,"finding":"AP180, the VAMP2-specific endocytic adaptor, maintains the large pool of vesicular VAMP2 (70 copies/SV) that is required for efficient neurotransmission and SV reformation. Loss of AP180 causes moderate activity-dependent reduction of vesicular VAMP2 levels, defects in SV reformation, excitatory/inhibitory imbalance, epileptic seizures, and premature death. Further reduction in AP180-/-/Syb2+/- mice causes perinatal lethality.","method":"AP180 knockout mice; genetic interaction (AP180-/-/Syb2+/- double mutant); electrophysiology; electron microscopy of SV reformation","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double-mutant analysis plus electrophysiology plus EM; replicated mechanistic link between AP180-mediated endocytosis and VAMP2 levels","pmids":["26412491"],"is_preprint":false},{"year":2017,"finding":"The central small amino acids G100 and C103 in the VAMP2 transmembrane domain are critical for exocytosis by providing structural flexibility (alpha-helix/beta-sheet transitions) necessary for fusion pore opening and expansion. G100V/C103V mutation nearly abolished depolarization-evoked exocytosis, retarded initial fusion pore opening, hindered expansion, and led to premature pore closure.","method":"Site-directed mutagenesis (G100V/C103V); infrared spectroscopy (IRRAS, evanescent wave, ellipsometry); membrane capacitance; TIRF microscopy; ATP release measurement","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with structural spectroscopy and multiple exocytosis readouts (capacitance, TIRF, ATP release); single lab but multiple orthogonal methods","pmids":["28588281"],"is_preprint":false},{"year":2019,"finding":"Heterozygous de novo mutations in VAMP2 (two single-amino-acid deletions and three missense variants in the C-terminal SNARE motif) cause a neurodevelopmental disorder with hypotonia, intellectual disability, and autistic features. Reconstituted lipid-mixing fusion assay demonstrated impaired vesicle fusion for these variants.","method":"Human genetics (de novo mutation identification); reconstituted lipid-mixing fusion assay","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — reconstituted fusion assay plus human genetic evidence; functional validation in reconstituted system is Tier 1 but limited details in abstract","pmids":["30929742"],"is_preprint":false},{"year":2020,"finding":"Different regions of the synaptic vesicle membrane regulate VAMP2 conformation for SNARE assembly. In-cell NMR spectroscopy showed dynamic membrane association of VAMP2 SNARE motif in mammalian cells; cholesterol-rich lipid raft regions markedly weaken membrane association of the VAMP2 SNARE motif, releasing it to facilitate SNARE complex assembly, whereas non-raft regions maintain stronger membrane association.","method":"In-cell NMR spectroscopy; mass-spectrometry-based lipidomic profiling; lipid raft isolation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in-cell NMR plus lipidomics; rigorous structural approach with functional implication; single study","pmids":["32210233"],"is_preprint":false},{"year":2020,"finding":"The complexin accessory helix suppresses spontaneous exocytosis by capturing the membrane-proximal C-terminal ends of both SNAP25 and VAMP2 prior to fusion in a reconstituted fusion assay. Site- and stage-specific photo-cross-linking revealed direct binding, and corresponding complexin interface mutants selectively increased spontaneous neurotransmitter release in living neurons.","method":"Reconstituted fusion assay; site-specific photo-cross-linking; neuronal electrophysiology","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution plus photo-cross-linking plus neuronal electrophysiology; multiple orthogonal methods in single study","pmids":["32698012"],"is_preprint":false},{"year":2020,"finding":"Munc18-1 helices 11 and 12 (domain 3a) interact with the VAMP2 SNARE motif covering layers -4 to +5; residue Q301 plays a pivotal role. A VAMP2-binding-deficient Munc18-1 Q301D mutant does not stimulate lipid mixing in reconstituted fusion and severely reduces synaptic transmission in Munc18-1-deficient neurons, demonstrating that Munc18-1/VAMP2 interaction is essential for SNARE templating.","method":"Comparative structure modeling; site-specific photo-cross-linking with unnatural amino acid Bpa; reconstituted vesicle docking/fusion assay; neuronal electrophysiology in Munc18-1-deficient neurons","journal":"eNeuro","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural modeling plus photo-cross-linking plus reconstituted fusion plus neuronal electrophysiology; multiple orthogonal methods","pmids":["33055194"],"is_preprint":false},{"year":2020,"finding":"Tetanus-insensitive (TI)-VAMP2 restores synaptic vesicle (SV) fusion in TeNT-treated hippocampal neurons but does not rescue dense core vesicle (DCV) fusion, despite TI-VAMP2 being targeted to and co-transported with DCVs. This demonstrates that VAMP2 is sufficient for SV fusion but that DCV fusion requires a distinct, unknown SNARE mechanism.","method":"Tetanus neurotoxin light chain expression; TI-VAMP2 rescue; live-cell imaging of DCV and SV fusion; VAMP1-null mutant analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — differential rescue experiment with isoform-specific constructs; multiple genetic and imaging approaches; clear mechanistic dissection","pmids":["32616842"],"is_preprint":false},{"year":2021,"finding":"VAMP2 mediates most exocytosis from recycling endosomes (RE) in neuronal dendrites for LTP expression. However, VAMP4 mediates the majority of dendritic RE exocytosis, while VAMP2 plays only a minor role in RE exocytosis. LTP induction increases exocytosis from both VAMP2- and VAMP4-labeled organelles; VAMP4 knockdown decreases TfR recycling but increases AMPAR recycling, demonstrating VAMP2 and VAMP4 sort AMPARs and TfRs into separate endosomal populations.","method":"VAMP2/4 knockdown; TIRF live imaging; LTP electrophysiology; tetanus toxin-mediated VAMP2 cleavage","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific isoform knockdown with TIRF imaging and electrophysiology; mechanistic dissection of VAMP2 vs. VAMP4 roles","pmids":["34496238"],"is_preprint":false},{"year":2022,"finding":"VAMP2/3-mediated exocytosis drives membrane expansion within myelin sheaths to initiate wrapping and power sheath elongation in oligodendrocytes. Genetic inactivation of VAMP2/3 in myelinating oligodendrocytes caused severe hypomyelination and premature death. Mass spectrometry revealed that VAMP2/3 incorporates axon-myelin adhesion proteins at the oligodendrocyte surface that are collectively required to form nodes of Ranvier.","method":"Conditional genetic knockout of VAMP2/3 in oligodendrocytes; live imaging; mass spectrometry of surface proteins","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with multiple functional readouts (live imaging, proteomics, histology); clear mechanistic pathway","pmids":["36151203"],"is_preprint":false},{"year":2024,"finding":"VAMP2 orchestrates alpha-synuclein (alphaSYN) phase separation both in vitro and in cells through electrostatic interactions between the VAMP2 juxtamembrane domain and the alphaSYN C-terminal region. VAMP2 binding induces co-condensate formation that sequesters vesicles and attracts complexin-1 and -2, and protects alphaSYN against forming aggregation-prone oligomers and fibrils.","method":"In vitro phase separation assays; live-cell condensate imaging; mutagenesis of charged residues; atomic force microscopy; fluorescence microscopy","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro plus cellular validation with mutagenesis; two independent papers in same journal issue with concordant findings","pmids":["38951707","38951706"],"is_preprint":false},{"year":2024,"finding":"The juxtamembrane region of VAMP2 directly interacts with the C-terminal region of alpha-synuclein through charged residues to regulate alphaSYN's function in clustering SVs and promoting SNARE complex assembly by inducing a multi-component condensed phase. VAMP2 binding protects alphaSYN against forming aggregation-prone oligomers and fibrils in condensates.","method":"Structural analysis; in vitro condensate formation; mutagenesis of charged residues; SV clustering assay; SNARE assembly assay; aggregation kinetics","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — molecular interaction mapping with mutagenesis plus multiple functional assays (SV clustering, SNARE assembly, aggregation); single lab but highly rigorous","pmids":["38951706"],"is_preprint":false},{"year":2024,"finding":"VAMP2 is required for keratinocyte enucleation and epidermal differentiation through regulation of nucleophagy. VAMP2 binds FIP200, an autophagy protein, and both are required for enucleation. Deletion of VAMP2 leads to aberrant skin stratification and enhances cutaneous carcinogenesis in vivo.","method":"Genome-wide shRNA screen; in vivo VAMP2 deletion; quantitative proteomics; co-immunoprecipitation with FIP200","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide screen plus in vivo deletion plus proteomics-identified binding partner; multiple orthogonal methods","pmids":["38810653"],"is_preprint":false},{"year":2012,"finding":"VAMP-2 is the v-SNARE involved in regulated surfactant secretion from alveolar type II cells. VAMP-2 and VAMP-8 are enriched in lamellar body fractions, but only the cytoplasmic domain of VAMP-2 (not VAMP-8) inhibited surfactant secretion in type II cells, and VAMP-2 co-localizes with the lamellar body marker protein LB-180.","method":"Subcellular fractionation; immunochemistry co-localization; cytoplasmic domain inhibition assay in type II cells","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative domain plus co-localization; isoform-specific dissection (VAMP-2 vs. VAMP-8)","pmids":["22571236"],"is_preprint":false},{"year":2010,"finding":"VAMP-1 and VAMP-2, but not VAMP-3, regulate ANP release from atrial cardiac myocytes. VAMP-1 and VAMP-2 co-sediment and co-localize with ANP, form a SNARE complex with syntaxin-4 inside cardiac myocytes, and knockdown of VAMP-1 or VAMP-2 (but not VAMP-3) blocks regulated ANP release.","method":"Co-sedimentation; co-localization; co-immunoprecipitation of SNARE complex; siRNA knockdown; ANP secretion assay","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown plus co-IP of endogenous complex; two VAMP isoforms compared; single lab","pmids":["20801128"],"is_preprint":false},{"year":2010,"finding":"Complexin 2 interacts with VAMP2 (as well as syntaxins 3 and 4) in pancreatic acini and regulates zymogen granule exocytosis. Introduction of recombinant complexin 2 inhibited Ca2+-stimulated secretion up to ~50%, and mutations of the central alpha-helical domain reduced SNARE binding and abolished inhibitory activity. An R59H mutation did not alter SNARE binding but augmented Ca2+-stimulated secretion by 130%.","method":"Co-immunoprecipitation; permeabilized acini reconstitution assay; site-directed mutagenesis; immunofluorescence co-localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted assay in permeabilized cells with mutagenesis dissecting inhibitory vs. stimulatory activities; multiple orthogonal approaches","pmids":["20829354"],"is_preprint":false},{"year":2015,"finding":"VAMP2 co-localizes with and mediates fusion of recycling vesicles containing transferrin receptor at the plasma membrane. VAMP2 depletion in HeLa cells suppressed recycling vesicle exocytosis, establishing a non-neuronal role for VAMP2 in transferrin receptor recycling downstream of the exocyst complex.","method":"siRNA depletion; co-localization microscopy; recycling vesicle exocytosis assay in HeLa cells","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single co-localization plus knockdown; single study, single lab","pmids":["26092867"],"is_preprint":false},{"year":2020,"finding":"Amyloid-beta peptides (Abeta40 and Abeta42) co-localize with VAMP2 in neuronal cells and decrease interactions between the N-termini of VAMP-2 and SNAP-25, disrupting SNARE complex formation critical for synaptic vesicle docking and fusion.","method":"FRET/FLIM imaging of Cer-VAMP2 and Cit-SNAP25 in N2A cells; confocal microscopy","journal":"Journal of Alzheimer's disease : JAD","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — FRET/FLIM provides direct protein-protein interaction evidence; single lab, single study","pmids":["32675412"],"is_preprint":false},{"year":1997,"finding":"VAMP-2 is present on gastric parietal cell tubulovesicles containing H+/K+-ATPase together with Rab11, Rab25, and SCAMPs, as demonstrated by immunoisolation on magnetic beads. The presence of VAMP-2 on immunoisolated H+/K+-ATPase-containing tubulovesicles supports their role in regulated vesicle fusion during parietal cell secretion.","method":"Gradient fractionation; immunoisolation on magnetic beads; Western blot analysis","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — immunoisolation with multiple antibodies confirming vesicle co-residency; single study, single lab","pmids":["9230141"],"is_preprint":false},{"year":1999,"finding":"An alternatively spliced isoform of rat VAMP-2, called VAMP-2B (retaining an intron, altering the carboxy-terminal end), co-localizes with endogenous VAMP-2 in PC12 cells after subcellular fractionation, indicating that alternative splicing at the C-terminus does not affect VAMP-2 sorting.","method":"cDNA cloning; myc-epitope tagging; subcellular fractionation in PC12 cells","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single fractionation study; negative result for functional sorting difference","pmids":["10371166"],"is_preprint":false},{"year":2015,"finding":"VAMP2-NRG1 is an oncogenic fusion gene that results from interchromosomal translocation; the fusion protein is membrane-bound, displays the NRG1 EGF-like domain extracellularly, and activates ERBB2/ERBB3 phosphorylation and downstream AKT/ERK signaling to promote anchorage-independent growth of lung adenocarcinoma cells.","method":"Whole-transcriptome sequencing; RT-PCR; immunoblotting for ERBB2/3/AKT/ERK phosphorylation; soft agar colony assay","journal":"Journal of thoracic oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional characterization (soft agar + signaling) of a VAMP2-containing fusion protein; single study","pmids":["26134228"],"is_preprint":false},{"year":2023,"finding":"VAMP2 cleavage in oligodendrocyte lineage cells impairs the maturation of premyelinating oligodendrocytes into functional myelinating cells in the developing mouse spinal cord. VAMP2/3-cleaved OLs stall at the premyelinating stage and show elevated Fyn kinase expression, indicating that VAMP2/3 activity is required for the premyelinating-to-myelinating transition.","method":"In vivo toxin-mediated VAMP2/3 cleavage in OL lineage; immunohistochemistry for Fyn; electron microscopy of myelin","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo functional cleavage with cellular stage-specific phenotype and molecular marker (Fyn) readout; single study","pmids":["37620160"],"is_preprint":false}],"current_model":"VAMP2 (synaptobrevin-2) is a vesicular SNARE protein that drives membrane fusion by forming a four-helix bundle with syntaxin-1A and SNAP-25; its SNARE motif conformation is regulated by lipid raft cholesterol content and by Munc18-1 (which templates SNARE assembly via helices 11/12), its transmembrane domain G100/C103 residues govern fusion-pore opening and expansion, and it is recycled to synaptic vesicles via the AP180/CALM endocytic pathway; beyond neurons it mediates Ca2+-dependent insulin secretion, insulin-stimulated GLUT4 translocation (requiring SNAP23/syntaxin4 co-SNAREs and downstream of PKCzeta-mediated serine phosphorylation), AQP2 vesicle trafficking in kidney, cAMP-stimulated NKCC2 and renin exocytosis, CNS myelination through membrane expansion in oligodendrocytes, and alpha-synuclein phase-separation regulation through direct interaction with its juxtamembrane domain."},"narrative":{"mechanistic_narrative":"VAMP2 (synaptobrevin-2) is the vesicular SNARE (v-SNARE) that drives Ca2+-regulated membrane fusion across diverse secretory and trafficking pathways by forming a four-helix bundle with cognate target-membrane SNAREs [PMID:7796801, PMID:20006577]. In the canonical exocytic machinery, VAMP2 zippers its C-terminal SNARE motif into a complex whose assembly is templated by Munc18-1 through interaction of its domain-3a helices 11/12 with the VAMP2 SNARE motif [PMID:33055194], and whose conformation is gated by the synaptic-vesicle lipid environment: cholesterol-rich raft regions weaken membrane association of the VAMP2 SNARE motif to release it for assembly [PMID:32210233]. The transmembrane small residues G100/C103 confer the structural flexibility required for fusion-pore opening and expansion [PMID:28588281], while the membrane-proximal C-termini of VAMP2 and SNAP25 are clamped by the complexin accessory helix to suppress premature spontaneous fusion [PMID:32698012]. VAMP2 is sorted onto synaptic vesicles through direct interaction with synaptophysin I [PMID:14528015] and retrieved from the plasma membrane by the dedicated endocytic adaptors AP180 and CALM, which maintain the vesicular VAMP2 pool needed for sustained neurotransmission and vesicle reformation [PMID:26412491, PMID:18182011]. Beyond neurons, VAMP2 acts as the v-SNARE for insulin-stimulated GLUT4 translocation in concert with the t-SNAREs syntaxin-4 and SNAP23, functioning specifically in the fusion step downstream of vesicle tethering and downstream of PKCzeta-mediated serine phosphorylation [PMID:9111311, PMID:10713150, PMID:20006577, PMID:11604519], and similarly drives AQP2, NKCC2, and renin trafficking in kidney, ANP and surfactant secretion, and VAMP2/3-dependent membrane expansion that powers oligodendrocyte myelination [PMID:7560075, PMID:25008321, PMID:21708949, PMID:36151203]. VAMP2 also engages alpha-synuclein through its juxtamembrane domain to nucleate a multi-component condensed phase that clusters synaptic vesicles, promotes SNARE assembly, and protects alpha-synuclein from aggregation [PMID:38951707, PMID:38951706]. Heterozygous de novo mutations in the C-terminal SNARE motif of VAMP2 impair vesicle fusion and cause a neurodevelopmental disorder with hypotonia, intellectual disability, and autistic features [PMID:30929742].","teleology":[{"year":1995,"claim":"Established that VAMP2 is functionally required for a specific regulated exocytic pathway rather than constitutive secretion, defining its role as a Ca2+-pathway v-SNARE outside neurons.","evidence":"Neurotoxin cleavage in permeabilized beta-cells and kidney collecting duct, with secretion and AQP2-vesicle co-localization readouts","pmids":["7796801","7560075"],"confidence":"High","gaps":["Did not resolve the cognate t-SNAREs in non-neuronal tissues","Mechanism of Ca2+-dependence not addressed at the molecular level"]},{"year":1998,"claim":"Defined the non-neuronal SNARE partners of VAMP2 and showed phosphorylation can regulate complex assembly, extending the v-SNARE function to the GLUT4 trafficking machinery.","evidence":"In vitro binary binding assays of VAMP2 with syntaxin-4 and SNAP23 plus kinase treatment; dominant-negative and co-IP studies in adipocytes/myoblasts","pmids":["9111311","8707843","9693005","10888677","10713150"],"confidence":"High","gaps":["Whether tethering versus fusion steps are separable was not yet distinguished","In vivo phosphosite on VAMP2 itself not mapped"]},{"year":2001,"claim":"Linked a signaling kinase to VAMP2-dependent GLUT4 exocytosis, providing an insulin-responsive regulatory input on the v-SNARE.","evidence":"PKCzeta gain- and loss-of-function with phosphoserine IP and glucose transport assays; later ProF adaptor co-IP and in vitro kinase assay","pmids":["11604519","17313651"],"confidence":"Medium","gaps":["Exact phosphorylated residue(s) on VAMP2 not definitively identified","Functional consequence of VAMP2 phosphorylation on fusion not directly measured"]},{"year":2003,"claim":"Identified synaptophysin I as the sorting determinant that targets VAMP2 to synaptic vesicles, answering how VAMP2 enters the regulated rather than constitutive pathway.","evidence":"Fluorescent chimera live imaging, co-IP, and dose-response in hippocampal neurons; follow-up with trafficking mutants in non-neuronal cells","pmids":["14528015","17331077"],"confidence":"High","gaps":["Structural basis of the SypI-VAMP2 cytoplasmic interaction not resolved","Whether SypI sorting operates in non-neuronal secretory cells not tested"]},{"year":2006,"claim":"Provided atomic detail of how clostridial neurotoxins recognize and cleave VAMP2, explaining the substrate specificity exploited throughout the functional literature.","evidence":"1.65 A crystal structure of BoNT/D light chain with comparison to BoNT/F","pmids":["16519520"],"confidence":"High","gaps":["Does not address VAMP2's own fusion mechanism","Structure of VAMP2 within an assembled SNARE complex not provided here"]},{"year":2007,"claim":"Identified CALM and later AP180 as VAMP2-specific endocytic adaptors, establishing the recycling arm that replenishes the vesicular VAMP2 pool.","evidence":"ANTH-domain overexpression/RNAi/dominant-negative for CALM; AP180 knockout and AP180-/-/Syb2+/- genetic interaction with electrophysiology and EM","pmids":["18182011","26412491"],"confidence":"High","gaps":["Recognition motif on VAMP2 for the ANTH domain not mapped","Relative contributions of CALM versus AP180 in different neuron types unresolved"]},{"year":2008,"claim":"Showed Munc18 isoforms and complexin act as opposing regulators on the VAMP2-containing SNARE complex, defining checkpoints in fusion control.","evidence":"Reconstituted liposome fusion with Munc18c inhibition; EPR of complexin-SNARE complex; co-IP electrophysiology of VAMP2-Kv2.1","pmids":["19116655","20026076","18542995"],"confidence":"High","gaps":["How Munc18 inhibition is converted to stimulation in vivo not resolved in these studies","Functional outcome of complexin accessory-helix displacement not yet tested in cells"]},{"year":2009,"claim":"Separated VAMP2's role from t-SNARE function by showing VAMP2 is dispensable for vesicle tethering but essential for the fusion step itself.","evidence":"RNAi of VAMP2 versus syntaxin-4/SNAP23 with TIRF-based tethering and fusion assays in adipocytes","pmids":["20006577"],"confidence":"High","gaps":["Molecular trigger coupling tethering to VAMP2-driven fusion not defined","Did not address whether this division applies to neuronal fusion"]},{"year":2017,"claim":"Demonstrated that the VAMP2 transmembrane domain actively shapes the fusion pore, moving VAMP2's role beyond cytoplasmic SNARE zippering.","evidence":"G100V/C103V mutagenesis with infrared spectroscopy, membrane capacitance, TIRF, and ATP release","pmids":["28588281"],"confidence":"High","gaps":["Atomic-resolution view of the transmembrane helix-to-sheet transition not obtained","Generalizability across vesicle types not established"]},{"year":2020,"claim":"Resolved how the membrane environment and Munc18-1 templating control VAMP2 conformation to prime SNARE assembly, and refined the complexin clamp on the VAMP2 C-terminus.","evidence":"In-cell NMR plus lipidomics; Munc18-1 photo-cross-linking and reconstituted fusion with neuronal rescue; complexin photo-cross-linking with electrophysiology","pmids":["32210233","33055194","32698012"],"confidence":"High","gaps":["How raft-mediated release and Munc18 templating are temporally coordinated in vivo unclear","Quantitative kinetics of conformational switching not established"]},{"year":2019,"claim":"Connected VAMP2 SNARE-motif function to human disease, showing that fusion-impairing variants cause a neurodevelopmental disorder.","evidence":"De novo mutation identification in patients with reconstituted lipid-mixing fusion validation","pmids":["30929742"],"confidence":"Medium","gaps":["Cellular and circuit-level consequences of each variant not characterized","Limited mechanistic detail on how each substitution disrupts fusion"]},{"year":2022,"claim":"Extended VAMP2 function to developmental membrane biology by showing VAMP2/3 exocytosis powers oligodendrocyte myelin membrane expansion and node-of-Ranvier formation.","evidence":"Conditional VAMP2/3 knockout and toxin-mediated cleavage in oligodendrocyte lineage with live imaging, proteomics, and EM","pmids":["36151203","37620160"],"confidence":"High","gaps":["The t-SNARE partners at the oligodendrocyte surface not defined","Cargo specificity of myelin-directed exocytosis incompletely mapped"]},{"year":2024,"claim":"Revealed a chaperone-like role in which the VAMP2 juxtamembrane domain drives alpha-synuclein phase separation that clusters vesicles, promotes SNARE assembly, and protects against alpha-synuclein aggregation.","evidence":"In vitro and in-cell condensate assays with charged-residue mutagenesis, SV clustering, SNARE assembly, and aggregation kinetics; concordant findings across two papers","pmids":["38951707","38951706"],"confidence":"High","gaps":["Physiological regulation of condensate assembly/disassembly unknown","Relationship between condensate state and disease aggregation in vivo not established"]},{"year":null,"claim":"How VAMP2's distinct membrane-fusion, cargo-sorting, condensate-forming, and autophagy/nucleophagy (FIP200-dependent) functions are differentially deployed across cell types and developmental contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model links VAMP2 conformational state to choice among fusion, sorting, and condensate pathways","DCV-specific and FIP200/nucleophagy mechanisms only partially characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,17,28]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[26]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,7]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2,3,8,40]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[11,17,38]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[30,38]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[1,6,22,17]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,17,19,24]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[23,27,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[31,34,43]}],"complexes":["SNARE complex (VAMP2/syntaxin-4/SNAP23)","neuronal SNARE complex (VAMP2/syntaxin-1/SNAP25)"],"partners":["SNAP23","STX4","MUNC18-1 (STXBP1)","STXBP3 (MUNC18C)","COMPLEXIN","SYP","AP180","PICALM"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P63027","full_name":"Vesicle-associated membrane protein 2","aliases":["Synaptobrevin-2"],"length_aa":116,"mass_kda":12.7,"function":"Involved in the targeting and/or fusion of transport vesicles to their target membrane (By similarity). Major SNARE protein of synaptic vesicles which mediates fusion of synaptic vesicles to release neurotransmitters. Essential for fast vesicular exocytosis and activity-dependent neurotransmitter release as well as fast endocytosis that mediates rapid reuse of synaptic vesicles (By similarity) (PubMed:30929742). Modulates the gating characteristics of the delayed rectifier voltage-dependent potassium channel KCNB1","subcellular_location":"Cytoplasmic vesicle, secretory vesicle, synaptic vesicle membrane; Cell membrane","url":"https://www.uniprot.org/uniprotkb/P63027/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VAMP2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000220205","cell_line_id":"CID000747","localizations":[{"compartment":"membrane","grade":3},{"compartment":"vesicles","grade":3},{"compartment":"golgi","grade":2}],"interactors":[{"gene":"VAMP3;VAMP2","stoichiometry":10.0},{"gene":"TFRC","stoichiometry":0.2},{"gene":"SNAP23","stoichiometry":0.2},{"gene":"NSF","stoichiometry":0.2},{"gene":"NAPA","stoichiometry":0.2},{"gene":"WDFY1","stoichiometry":0.2},{"gene":"RAB11B","stoichiometry":0.2},{"gene":"SYPL1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000747","total_profiled":1310},"omim":[{"mim_id":"618760","title":"NEURODEVELOPMENTAL DISORDER WITH HYPOTONIA AND AUTISTIC FEATURES WITH OR WITHOUT HYPERKINETIC MOVEMENTS; NEDHAHM","url":"https://www.omim.org/entry/618760"},{"mim_id":"618323","title":"MYASTHENIC SYNDROME, CONGENITAL, 25, PRESYNAPTIC; CMS25","url":"https://www.omim.org/entry/618323"},{"mim_id":"612662","title":"TBC1 DOMAIN FAMILY, MEMBER 15; TBC1D15","url":"https://www.omim.org/entry/612662"},{"mim_id":"610844","title":"SPG11 VESICLE TRAFFICKING ASSOCIATED, SPATACSIN; SPG11","url":"https://www.omim.org/entry/610844"},{"mim_id":"610415","title":"SYNTAXIN-BINDING PROTEIN 4; STXBP4","url":"https://www.omim.org/entry/610415"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":463.9}],"url":"https://www.proteinatlas.org/search/VAMP2"},"hgnc":{"alias_symbol":["VAMP-2"],"prev_symbol":["SYB2"]},"alphafold":{"accession":"P63027","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P63027","model_url":"https://alphafold.ebi.ac.uk/files/AF-P63027-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P63027-F1-predicted_aligned_error_v6.png","plddt_mean":78.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VAMP2","jax_strain_url":"https://www.jax.org/strain/search?query=VAMP2"},"sequence":{"accession":"P63027","fasta_url":"https://rest.uniprot.org/uniprotkb/P63027.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P63027/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P63027"}},"corpus_meta":[{"pmid":"23638301","id":"PMC_23638301","title":"Native α-synuclein induces clustering of synaptic-vesicle mimics via binding to phospholipids and synaptobrevin-2/VAMP2.","date":"2013","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/23638301","citation_count":292,"is_preprint":false},{"pmid":"9111311","id":"PMC_9111311","title":"Syntaxin 4, VAMP2, and/or VAMP3/cellubrevin are functional target membrane and vesicle SNAP receptors for insulin-stimulated GLUT4 translocation in adipocytes.","date":"1997","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9111311","citation_count":205,"is_preprint":false},{"pmid":"7796801","id":"PMC_7796801","title":"VAMP-2 and cellubrevin are expressed in pancreatic beta-cells and are essential for Ca(2+)-but not for GTP gamma S-induced insulin secretion.","date":"1995","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/7796801","citation_count":204,"is_preprint":false},{"pmid":"8707843","id":"PMC_8707843","title":"The glucose transporter (GLUT-4) and vesicle-associated membrane protein-2 (VAMP-2) are segregated from recycling endosomes in insulin-sensitive cells.","date":"1996","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/8707843","citation_count":188,"is_preprint":false},{"pmid":"15327778","id":"PMC_15327778","title":"VAMP2-dependent exocytosis regulates plasma membrane insertion of TRPC3 channels and contributes to agonist-stimulated Ca2+ influx.","date":"2004","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/15327778","citation_count":166,"is_preprint":false},{"pmid":"7560075","id":"PMC_7560075","title":"Expression of VAMP-2-like protein in kidney collecting duct intracellular vesicles. 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Tetanus toxin and botulinum B neurotoxin selectively cleaved VAMP-2 and cellubrevin in permeabilized beta-cells and abolished Ca2+-induced insulin release (IC50 ~15 nM), but did not prevent GTP-gamma-S-stimulated secretion, demonstrating that VAMP-2 selectively controls the Ca2+-mediated exocytotic pathway.\",\n      \"method\": \"Tetanus toxin and botulinum B neurotoxin cleavage assay in streptolysin-O permeabilized insulin-secreting cells; subcellular fractionation; confocal microscopy\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic cleavage with neurotoxins plus functional rescue readout; clear mechanistic dissection of Ca2+-dependent vs. GTP-gamma-S pathway\",\n      \"pmids\": [\"7796801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"VAMP2 functions as a vesicle-SNARE (v-SNARE) required for insulin-stimulated GLUT4 translocation to the plasma membrane in adipocytes. Expression of the cytoplasmic domain of VAMP2 inhibited insulin-stimulated GLUT4 but not GLUT1 translocation, and immunoprecipitation of syntaxin 4 cytoplasmic domain co-precipitated GLUT4-containing vesicles in an insulin-stimulated manner.\",\n      \"method\": \"Recombinant vaccinia virus expression; single-cell microinjection; co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative and co-IP approaches replicated across multiple insulin-responsive systems in several subsequent papers\",\n      \"pmids\": [\"9111311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"VAMP-2 co-localizes with GLUT-4 in a specialized post-endosomal intracellular compartment in adipocytes that is segregated from recycling endosomes (transferrin receptor/cellubrevin-positive). Endosomal ablation with transferrin-HRP/DAB removed >90% of cellubrevin but spared 90% of VAMP-2, and immunoisolated GLUT-4 vesicles contained VAMP-2.\",\n      \"method\": \"Endosomal ablation (Tf-HRP/DAB), immunoadsorption of vesicles, immuno-electron microscopy, subcellular fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (functional ablation, immuno-EM, immunoisolation) in single study; replicated by subsequent morphological studies\",\n      \"pmids\": [\"8707843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"VAMP2 is expressed on AQP2-containing intracellular vesicles in kidney collecting duct principal cells, as demonstrated by co-immunoprecipitation and double immunolabeling; VAMP2 in kidney membranes is cleaved by tetanus toxin, establishing it as a tetanus-toxin-sensitive SNARE in this tissue. Quantitative immuno-EM showed highly significant co-localization of AQP2 and VAMP2 on the same vesicles (P<0.0001).\",\n      \"method\": \"Immunoblotting, immunoisolation with anti-VAMP2 antibodies, double immunolabeling immuno-EM, tetanus toxin cleavage\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (immunoisolation, immuno-EM with quantification, tetanus toxin cleavage) in single focused study\",\n      \"pmids\": [\"7560075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"VAMP-2 forms binary, saturable interactions with both syntaxin-4 and SNAP23 in vitro, establishing the non-neuronal SNARE complex for exocytosis. Unlike neuronal SNAP25, SNAP23 did not potentiate VAMP-2 binding to syntaxin-4. PKA phosphorylation of syntaxin-4 (but not casein kinase II) disrupted its binding to SNAP23, indicating phosphorylation-dependent regulation of SNARE complex formation.\",\n      \"method\": \"In vitro binary binding assay; phosphorylation by exogenous kinases (PKA, CKII, PKC); phosphate incorporation quantification\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro binding with quantification and mutagenesis-equivalent phosphorylation studies; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9693005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"A dual Rab/VAMP2 receptor protein (PRA1) was identified that specifically binds VAMP2 (but not VAMP1 or cellubrevin); this specificity requires the proline-rich domain and transmembrane domain of VAMP2. The interaction is distinct from VAMP2 binding to syntaxin or syntaxin/SNAP-25, suggesting PRA1 links Rab GTPases and VAMP2 in vesicle docking/fusion control.\",\n      \"method\": \"Yeast two-hybrid screen; in vitro binding assays; chimeric/deletion mutant analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — yeast two-hybrid plus in vitro binding with multiple deletion and chimeric mutants; single lab\",\n      \"pmids\": [\"9341137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"VAMP2, but not VAMP3/cellubrevin, specifically mediates insulin-dependent GLUT4 translocation in L6 myoblasts. Toxin-resistant VAMP2 rescued tetanus toxin-inhibited GLUT4 translocation, whereas toxin-resistant VAMP3 did not. Insulin caused cortical actin reorganization in which GLUT4 and VAMP2 (but not VAMP3) were clustered.\",\n      \"method\": \"Tetanus toxin light chain transfection; rescue with toxin-resistant VAMP2/3 constructs; single-cell fluorescence GLUT4 translocation assay; immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific rescue experiment with toxin-resistant constructs plus cellular imaging; replicated across multiple cell systems\",\n      \"pmids\": [\"10888677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SNAP23 mediates insulin-dependent GLUT4 translocation by acting as a bridging molecule between syntaxin4 (t-SNARE) and VAMP2 (v-SNARE) in 3T3-L1 adipocytes. A SNAP23 mutant (DeltaC8) that bound syntaxin4 but not VAMP2 and failed to mediate the syntaxin4-VAMP2 interaction acted as a dominant negative, blocking insulin-induced GLUT4 translocation.\",\n      \"method\": \"Adenovirus-mediated overexpression of SNAP23 mutants; in vitro and in vivo co-immunoprecipitation; GLUT4 translocation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-mapping mutants with functional readout in cells plus in vitro binding; two orthogonal methods\",\n      \"pmids\": [\"10713150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Synaptophysin I (SypI) controls the targeting of VAMP2 to synaptic vesicles through direct protein-protein interaction requiring the cytoplasmic domain of VAMP2. Without SypI co-expression, VAMP2 travels in vesicles that constitutively fuse with the plasma membrane; co-expression of SypI restores correct sorting to SVs in a dose-dependent and VAMP2-specific manner.\",\n      \"method\": \"Fluorescent chimera expression in hippocampal neurons; live imaging; co-immunoprecipitation; dose-response analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging of trafficking combined with co-IP and dose-dependent functional rescue in primary neurons; single lab\",\n      \"pmids\": [\"14528015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"VAMP2-dependent exocytosis regulates plasma membrane insertion of TRPC3 channels and contributes to agonist-stimulated Ca2+ influx. TRPC3 N-terminus directly interacts with VAMP2; cleavage of VAMP2 by tetanus toxin reduced TRPC3 surface expression and decreased carbachol- and OAG-stimulated (but not thapsigargin-stimulated) Ca2+ influx.\",\n      \"method\": \"Co-immunoprecipitation; GFP-TRPC3 live imaging; FRAP; tetanus toxin cleavage; Ca2+ influx measurement\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional tetanus toxin cleavage plus live imaging; multiple orthogonal methods in single study\",\n      \"pmids\": [\"15327778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The 1.65 Å crystal structure of BoNT/D light chain provides molecular details of how VAMP-2 is recognized and cleaved. A hydrophobic pocket recognizes the P1' VAMP-2 residue Leu60, and a second remote site recognizes the V1 SNARE motif. Comparison with BoNT/F-LC (which cleaves VAMP-2 one residue away) showed that BoNT/D uses hydrophobic interactions for V1 motif recognition whereas BoNT/F adopts a hydrophilic strategy.\",\n      \"method\": \"X-ray crystallography at 1.65 Å resolution; structural comparison\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure with detailed mechanistic analysis of substrate recognition; single study but Tier 1 method\",\n      \"pmids\": [\"16519520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CALM (clathrin assembly lymphoid myeloid leukemia protein) facilitates endocytosis of VAMP2 from the plasma membrane via its ANTH domain. CALM overexpression reduced surface VAMP2; CALM knockdown by RNAi accumulated surface VAMP2; the ANTH domain alone acted as a dominant-negative, establishing CALM as a specific endocytic adaptor for VAMP2.\",\n      \"method\": \"Overexpression; RNA interference knockdown; dominant-negative ANTH domain expression; cell surface VAMP2 quantification\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function, loss-of-function, and dominant-negative all showing consistent phenotype; multiple orthogonal approaches\",\n      \"pmids\": [\"18182011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Synaptophysin I specifies the exocytic pathway of VAMP2 by directing its sorting to vesicles before surface delivery, not by inhibiting VAMP2 endocytosis. Physical interaction between SypI and VAMP2 is required, mediated by the C-terminal domain of SypI. Dynamin and alpha-SNAP mutants blocking trafficking at the plasma membrane did not abolish SypI's effect on VAMP2 sorting.\",\n      \"method\": \"Ectopic expression in non-neuronal cells; co-immunoprecipitation; dominant-negative dynamin and alpha-SNAP mutants; fluorescence microscopy\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus multiple trafficking mutants; single lab, mechanistic follow-up confirming findings from 2003 paper\",\n      \"pmids\": [\"17331077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ProF (WD-repeat-propeller-FYVE protein) interacts with VAMP2 and PKCzeta, forming a ternary complex on vesicular membranes. VAMP2 can be phosphorylated by activated PKCzeta in vitro, and ProF acts as an adaptor that increases PKCzeta-dependent phosphorylation of VAMP2 in vitro.\",\n      \"method\": \"Co-immunoprecipitation of endogenous and overexpressed proteins; in vitro kinase assay; co-localization imaging\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP and in vitro phosphorylation; single lab, single study\",\n      \"pmids\": [\"17313651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VAMP2 directly interacts with the T1 domain of the N-terminus of Kv2.1 potassium channel and enhances channel inactivation. This interaction was demonstrated in brain membranes and characterized by electrophysiology and in vitro binding; a chimeric Kv1.5N/Kv2.1 channel confirmed the N-terminal T1 domain requirement.\",\n      \"method\": \"In vitro binding assay; electrophysiology in Xenopus oocytes; co-immunoprecipitation from brain membranes; chimeric channel analysis; protein modeling\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding plus electrophysiology plus brain co-IP plus chimeric domain analysis; multiple orthogonal methods\",\n      \"pmids\": [\"18542995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Munc18c directly inhibits bilayer fusion mediated by the syntaxin4/SNAP23/VAMP2 SNARE complex in a reconstituted liposome fusion assay, making contacts with both t-SNARE (syntaxin4) and v-SNARE (VAMP2) components.\",\n      \"method\": \"Reconstituted liposome fusion assay; biochemical binding characterization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro fusion assay with direct inhibition readout; rigorous reductionist approach; single lab\",\n      \"pmids\": [\"19116655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PKCzeta, activated by insulin, associates specifically with GLUT4 compartments and induces serine phosphorylation of the GLUT4-compartment-associated VAMP2. Dominant-negative PKCzeta disrupted GLUT4 compartment integrity and abrogated insulin-induced GLUT4 translocation, while active PKCzeta overexpression caused GLUT4 translocation in the absence of insulin.\",\n      \"method\": \"Adenovirus-mediated overexpression of wild-type and dominant-negative PKCzeta; subcellular fractionation; phosphoserine immunoprecipitation; glucose transport assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function and dominant-negative with biochemical phosphorylation readout; single lab\",\n      \"pmids\": [\"11604519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The t-SNAREs syntaxin4 and SNAP23 are required for tethering of GLUT4 vesicles to the plasma membrane, whereas v-SNARE VAMP2 is not required for tethering but is essential for the subsequent membrane fusion event. RNAi depletion of VAMP2 inhibited fusion without affecting tethering, while depletion of syntaxin4 or SNAP23 impaired tethering.\",\n      \"method\": \"RNAi knockdown in 3T3-L1 adipocytes; TIRF microscopy-based vesicle tethering and fusion assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific gene knockdown with TIRF imaging distinguishing tethering vs. fusion steps; two orthogonal knockdowns compared in single study\",\n      \"pmids\": [\"20006577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The accessory alpha-helix of complexin I (residues 27-48) can locally displace VAMP2 from the C-terminus of the SNARE four-helix bundle, making the complex weaker, but remains detached when the N-terminal region of complexin I (residues 1-26) is present. This suggests the balance between the accessory helix and N-terminal domain determines stimulatory vs. inhibitory complexin function.\",\n      \"method\": \"EPR spectroscopy of complexin-SNARE quaternary complex; site-directed spin labeling\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — EPR structural analysis with domain deletion; single lab, no functional reconstitution validation\",\n      \"pmids\": [\"20026076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VAMP2 (but not VAMP3) mediates cAMP-stimulated renin release from juxtaglomerular cells. VAMP2 co-localizes with renin-containing granules, and shRNA silencing of VAMP2 blocked cAMP-induced renin release by ~50% and impaired cAMP-stimulated exocytosis (FM1-43 assay), while VAMP3 silencing had no effect.\",\n      \"method\": \"Confocal colocalization; adenoviral shRNA knockdown; FM1-43 exocytosis assay; renin secretion measurement; tetanus toxin cleavage\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific VAMP2 vs. VAMP3 knockdown with functional exocytosis readout; multiple methods in single study\",\n      \"pmids\": [\"21708949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Native alpha-synuclein promotes clustering of synaptic-vesicle mimics through specific interactions with both synaptobrevin-2/VAMP2 and anionic lipids. The lipid-binding-deficient A30P mutant disrupted clustering, while other familial PD mutants did not. Alpha-synuclein had little effect on Ca2+-triggered fusion in this reconstituted single-vesicle system.\",\n      \"method\": \"Single-vesicle optical microscopy; recombinant and native alpha-synuclein purified from mouse brain; vesicle clustering assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted single-vesicle system with native protein plus multiple mutant analyses; validated with brain-purified protein\",\n      \"pmids\": [\"23638301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Heat shock factor 1 (HSF1) transcriptional activity mediates alcohol-induced upregulation of Vamp2 (but not Vamp1) expression in mouse cortical neurons. This increased VAMP2 expression leads to increased frequency of GABAergic miniature IPSCs via HSF1, without affecting mEPSCs, establishing a specific presynaptic adaptation in GABAergic terminals.\",\n      \"method\": \"HSF1 transcription factor manipulation; electrophysiology (mIPSC recording); RT-PCR; pharmacological HSF1 inhibition\",\n      \"journal\": \"Frontiers in integrative neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus molecular genetic HSF1 manipulation; single lab, two orthogonal readouts\",\n      \"pmids\": [\"24376402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VAMP2 (but not VAMP3) selectively mediates cAMP-stimulated NKCC2 exocytic delivery and surface expression in renal thick ascending limb cells. NKCC2 co-immunoprecipitates with VAMP2, and PKA activation enhanced VAMP2-NKCC2 co-immunoprecipitation. In vivo silencing of VAMP2 blocked cAMP-stimulated NKCC2 exocytic delivery.\",\n      \"method\": \"Co-immunoprecipitation; in vivo VAMP2/3 siRNA silencing; surface NKCC2 expression assay; VAMP2 exocytosis assay in renal cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with specific functional readout plus co-IP; isoform-specific dissection (VAMP2 vs. VAMP3)\",\n      \"pmids\": [\"25008321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AP180, the VAMP2-specific endocytic adaptor, maintains the large pool of vesicular VAMP2 (70 copies/SV) that is required for efficient neurotransmission and SV reformation. Loss of AP180 causes moderate activity-dependent reduction of vesicular VAMP2 levels, defects in SV reformation, excitatory/inhibitory imbalance, epileptic seizures, and premature death. Further reduction in AP180-/-/Syb2+/- mice causes perinatal lethality.\",\n      \"method\": \"AP180 knockout mice; genetic interaction (AP180-/-/Syb2+/- double mutant); electrophysiology; electron microscopy of SV reformation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double-mutant analysis plus electrophysiology plus EM; replicated mechanistic link between AP180-mediated endocytosis and VAMP2 levels\",\n      \"pmids\": [\"26412491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The central small amino acids G100 and C103 in the VAMP2 transmembrane domain are critical for exocytosis by providing structural flexibility (alpha-helix/beta-sheet transitions) necessary for fusion pore opening and expansion. G100V/C103V mutation nearly abolished depolarization-evoked exocytosis, retarded initial fusion pore opening, hindered expansion, and led to premature pore closure.\",\n      \"method\": \"Site-directed mutagenesis (G100V/C103V); infrared spectroscopy (IRRAS, evanescent wave, ellipsometry); membrane capacitance; TIRF microscopy; ATP release measurement\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with structural spectroscopy and multiple exocytosis readouts (capacitance, TIRF, ATP release); single lab but multiple orthogonal methods\",\n      \"pmids\": [\"28588281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Heterozygous de novo mutations in VAMP2 (two single-amino-acid deletions and three missense variants in the C-terminal SNARE motif) cause a neurodevelopmental disorder with hypotonia, intellectual disability, and autistic features. Reconstituted lipid-mixing fusion assay demonstrated impaired vesicle fusion for these variants.\",\n      \"method\": \"Human genetics (de novo mutation identification); reconstituted lipid-mixing fusion assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reconstituted fusion assay plus human genetic evidence; functional validation in reconstituted system is Tier 1 but limited details in abstract\",\n      \"pmids\": [\"30929742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Different regions of the synaptic vesicle membrane regulate VAMP2 conformation for SNARE assembly. In-cell NMR spectroscopy showed dynamic membrane association of VAMP2 SNARE motif in mammalian cells; cholesterol-rich lipid raft regions markedly weaken membrane association of the VAMP2 SNARE motif, releasing it to facilitate SNARE complex assembly, whereas non-raft regions maintain stronger membrane association.\",\n      \"method\": \"In-cell NMR spectroscopy; mass-spectrometry-based lipidomic profiling; lipid raft isolation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in-cell NMR plus lipidomics; rigorous structural approach with functional implication; single study\",\n      \"pmids\": [\"32210233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The complexin accessory helix suppresses spontaneous exocytosis by capturing the membrane-proximal C-terminal ends of both SNAP25 and VAMP2 prior to fusion in a reconstituted fusion assay. Site- and stage-specific photo-cross-linking revealed direct binding, and corresponding complexin interface mutants selectively increased spontaneous neurotransmitter release in living neurons.\",\n      \"method\": \"Reconstituted fusion assay; site-specific photo-cross-linking; neuronal electrophysiology\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution plus photo-cross-linking plus neuronal electrophysiology; multiple orthogonal methods in single study\",\n      \"pmids\": [\"32698012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Munc18-1 helices 11 and 12 (domain 3a) interact with the VAMP2 SNARE motif covering layers -4 to +5; residue Q301 plays a pivotal role. A VAMP2-binding-deficient Munc18-1 Q301D mutant does not stimulate lipid mixing in reconstituted fusion and severely reduces synaptic transmission in Munc18-1-deficient neurons, demonstrating that Munc18-1/VAMP2 interaction is essential for SNARE templating.\",\n      \"method\": \"Comparative structure modeling; site-specific photo-cross-linking with unnatural amino acid Bpa; reconstituted vesicle docking/fusion assay; neuronal electrophysiology in Munc18-1-deficient neurons\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural modeling plus photo-cross-linking plus reconstituted fusion plus neuronal electrophysiology; multiple orthogonal methods\",\n      \"pmids\": [\"33055194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tetanus-insensitive (TI)-VAMP2 restores synaptic vesicle (SV) fusion in TeNT-treated hippocampal neurons but does not rescue dense core vesicle (DCV) fusion, despite TI-VAMP2 being targeted to and co-transported with DCVs. This demonstrates that VAMP2 is sufficient for SV fusion but that DCV fusion requires a distinct, unknown SNARE mechanism.\",\n      \"method\": \"Tetanus neurotoxin light chain expression; TI-VAMP2 rescue; live-cell imaging of DCV and SV fusion; VAMP1-null mutant analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — differential rescue experiment with isoform-specific constructs; multiple genetic and imaging approaches; clear mechanistic dissection\",\n      \"pmids\": [\"32616842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VAMP2 mediates most exocytosis from recycling endosomes (RE) in neuronal dendrites for LTP expression. However, VAMP4 mediates the majority of dendritic RE exocytosis, while VAMP2 plays only a minor role in RE exocytosis. LTP induction increases exocytosis from both VAMP2- and VAMP4-labeled organelles; VAMP4 knockdown decreases TfR recycling but increases AMPAR recycling, demonstrating VAMP2 and VAMP4 sort AMPARs and TfRs into separate endosomal populations.\",\n      \"method\": \"VAMP2/4 knockdown; TIRF live imaging; LTP electrophysiology; tetanus toxin-mediated VAMP2 cleavage\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific isoform knockdown with TIRF imaging and electrophysiology; mechanistic dissection of VAMP2 vs. VAMP4 roles\",\n      \"pmids\": [\"34496238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"VAMP2/3-mediated exocytosis drives membrane expansion within myelin sheaths to initiate wrapping and power sheath elongation in oligodendrocytes. Genetic inactivation of VAMP2/3 in myelinating oligodendrocytes caused severe hypomyelination and premature death. Mass spectrometry revealed that VAMP2/3 incorporates axon-myelin adhesion proteins at the oligodendrocyte surface that are collectively required to form nodes of Ranvier.\",\n      \"method\": \"Conditional genetic knockout of VAMP2/3 in oligodendrocytes; live imaging; mass spectrometry of surface proteins\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with multiple functional readouts (live imaging, proteomics, histology); clear mechanistic pathway\",\n      \"pmids\": [\"36151203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VAMP2 orchestrates alpha-synuclein (alphaSYN) phase separation both in vitro and in cells through electrostatic interactions between the VAMP2 juxtamembrane domain and the alphaSYN C-terminal region. VAMP2 binding induces co-condensate formation that sequesters vesicles and attracts complexin-1 and -2, and protects alphaSYN against forming aggregation-prone oligomers and fibrils.\",\n      \"method\": \"In vitro phase separation assays; live-cell condensate imaging; mutagenesis of charged residues; atomic force microscopy; fluorescence microscopy\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro plus cellular validation with mutagenesis; two independent papers in same journal issue with concordant findings\",\n      \"pmids\": [\"38951707\", \"38951706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The juxtamembrane region of VAMP2 directly interacts with the C-terminal region of alpha-synuclein through charged residues to regulate alphaSYN's function in clustering SVs and promoting SNARE complex assembly by inducing a multi-component condensed phase. VAMP2 binding protects alphaSYN against forming aggregation-prone oligomers and fibrils in condensates.\",\n      \"method\": \"Structural analysis; in vitro condensate formation; mutagenesis of charged residues; SV clustering assay; SNARE assembly assay; aggregation kinetics\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — molecular interaction mapping with mutagenesis plus multiple functional assays (SV clustering, SNARE assembly, aggregation); single lab but highly rigorous\",\n      \"pmids\": [\"38951706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VAMP2 is required for keratinocyte enucleation and epidermal differentiation through regulation of nucleophagy. VAMP2 binds FIP200, an autophagy protein, and both are required for enucleation. Deletion of VAMP2 leads to aberrant skin stratification and enhances cutaneous carcinogenesis in vivo.\",\n      \"method\": \"Genome-wide shRNA screen; in vivo VAMP2 deletion; quantitative proteomics; co-immunoprecipitation with FIP200\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide screen plus in vivo deletion plus proteomics-identified binding partner; multiple orthogonal methods\",\n      \"pmids\": [\"38810653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VAMP-2 is the v-SNARE involved in regulated surfactant secretion from alveolar type II cells. VAMP-2 and VAMP-8 are enriched in lamellar body fractions, but only the cytoplasmic domain of VAMP-2 (not VAMP-8) inhibited surfactant secretion in type II cells, and VAMP-2 co-localizes with the lamellar body marker protein LB-180.\",\n      \"method\": \"Subcellular fractionation; immunochemistry co-localization; cytoplasmic domain inhibition assay in type II cells\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative domain plus co-localization; isoform-specific dissection (VAMP-2 vs. VAMP-8)\",\n      \"pmids\": [\"22571236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"VAMP-1 and VAMP-2, but not VAMP-3, regulate ANP release from atrial cardiac myocytes. VAMP-1 and VAMP-2 co-sediment and co-localize with ANP, form a SNARE complex with syntaxin-4 inside cardiac myocytes, and knockdown of VAMP-1 or VAMP-2 (but not VAMP-3) blocks regulated ANP release.\",\n      \"method\": \"Co-sedimentation; co-localization; co-immunoprecipitation of SNARE complex; siRNA knockdown; ANP secretion assay\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown plus co-IP of endogenous complex; two VAMP isoforms compared; single lab\",\n      \"pmids\": [\"20801128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Complexin 2 interacts with VAMP2 (as well as syntaxins 3 and 4) in pancreatic acini and regulates zymogen granule exocytosis. Introduction of recombinant complexin 2 inhibited Ca2+-stimulated secretion up to ~50%, and mutations of the central alpha-helical domain reduced SNARE binding and abolished inhibitory activity. An R59H mutation did not alter SNARE binding but augmented Ca2+-stimulated secretion by 130%.\",\n      \"method\": \"Co-immunoprecipitation; permeabilized acini reconstitution assay; site-directed mutagenesis; immunofluorescence co-localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted assay in permeabilized cells with mutagenesis dissecting inhibitory vs. stimulatory activities; multiple orthogonal approaches\",\n      \"pmids\": [\"20829354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VAMP2 co-localizes with and mediates fusion of recycling vesicles containing transferrin receptor at the plasma membrane. VAMP2 depletion in HeLa cells suppressed recycling vesicle exocytosis, establishing a non-neuronal role for VAMP2 in transferrin receptor recycling downstream of the exocyst complex.\",\n      \"method\": \"siRNA depletion; co-localization microscopy; recycling vesicle exocytosis assay in HeLa cells\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single co-localization plus knockdown; single study, single lab\",\n      \"pmids\": [\"26092867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Amyloid-beta peptides (Abeta40 and Abeta42) co-localize with VAMP2 in neuronal cells and decrease interactions between the N-termini of VAMP-2 and SNAP-25, disrupting SNARE complex formation critical for synaptic vesicle docking and fusion.\",\n      \"method\": \"FRET/FLIM imaging of Cer-VAMP2 and Cit-SNAP25 in N2A cells; confocal microscopy\",\n      \"journal\": \"Journal of Alzheimer's disease : JAD\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — FRET/FLIM provides direct protein-protein interaction evidence; single lab, single study\",\n      \"pmids\": [\"32675412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"VAMP-2 is present on gastric parietal cell tubulovesicles containing H+/K+-ATPase together with Rab11, Rab25, and SCAMPs, as demonstrated by immunoisolation on magnetic beads. The presence of VAMP-2 on immunoisolated H+/K+-ATPase-containing tubulovesicles supports their role in regulated vesicle fusion during parietal cell secretion.\",\n      \"method\": \"Gradient fractionation; immunoisolation on magnetic beads; Western blot analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — immunoisolation with multiple antibodies confirming vesicle co-residency; single study, single lab\",\n      \"pmids\": [\"9230141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"An alternatively spliced isoform of rat VAMP-2, called VAMP-2B (retaining an intron, altering the carboxy-terminal end), co-localizes with endogenous VAMP-2 in PC12 cells after subcellular fractionation, indicating that alternative splicing at the C-terminus does not affect VAMP-2 sorting.\",\n      \"method\": \"cDNA cloning; myc-epitope tagging; subcellular fractionation in PC12 cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single fractionation study; negative result for functional sorting difference\",\n      \"pmids\": [\"10371166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VAMP2-NRG1 is an oncogenic fusion gene that results from interchromosomal translocation; the fusion protein is membrane-bound, displays the NRG1 EGF-like domain extracellularly, and activates ERBB2/ERBB3 phosphorylation and downstream AKT/ERK signaling to promote anchorage-independent growth of lung adenocarcinoma cells.\",\n      \"method\": \"Whole-transcriptome sequencing; RT-PCR; immunoblotting for ERBB2/3/AKT/ERK phosphorylation; soft agar colony assay\",\n      \"journal\": \"Journal of thoracic oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional characterization (soft agar + signaling) of a VAMP2-containing fusion protein; single study\",\n      \"pmids\": [\"26134228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VAMP2 cleavage in oligodendrocyte lineage cells impairs the maturation of premyelinating oligodendrocytes into functional myelinating cells in the developing mouse spinal cord. VAMP2/3-cleaved OLs stall at the premyelinating stage and show elevated Fyn kinase expression, indicating that VAMP2/3 activity is required for the premyelinating-to-myelinating transition.\",\n      \"method\": \"In vivo toxin-mediated VAMP2/3 cleavage in OL lineage; immunohistochemistry for Fyn; electron microscopy of myelin\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo functional cleavage with cellular stage-specific phenotype and molecular marker (Fyn) readout; single study\",\n      \"pmids\": [\"37620160\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VAMP2 (synaptobrevin-2) is a vesicular SNARE protein that drives membrane fusion by forming a four-helix bundle with syntaxin-1A and SNAP-25; its SNARE motif conformation is regulated by lipid raft cholesterol content and by Munc18-1 (which templates SNARE assembly via helices 11/12), its transmembrane domain G100/C103 residues govern fusion-pore opening and expansion, and it is recycled to synaptic vesicles via the AP180/CALM endocytic pathway; beyond neurons it mediates Ca2+-dependent insulin secretion, insulin-stimulated GLUT4 translocation (requiring SNAP23/syntaxin4 co-SNAREs and downstream of PKCzeta-mediated serine phosphorylation), AQP2 vesicle trafficking in kidney, cAMP-stimulated NKCC2 and renin exocytosis, CNS myelination through membrane expansion in oligodendrocytes, and alpha-synuclein phase-separation regulation through direct interaction with its juxtamembrane domain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VAMP2 (synaptobrevin-2) is the vesicular SNARE (v-SNARE) that drives Ca2+-regulated membrane fusion across diverse secretory and trafficking pathways by forming a four-helix bundle with cognate target-membrane SNAREs [#0, #17]. In the canonical exocytic machinery, VAMP2 zippers its C-terminal SNARE motif into a complex whose assembly is templated by Munc18-1 through interaction of its domain-3a helices 11/12 with the VAMP2 SNARE motif [#28], and whose conformation is gated by the synaptic-vesicle lipid environment: cholesterol-rich raft regions weaken membrane association of the VAMP2 SNARE motif to release it for assembly [#26]. The transmembrane small residues G100/C103 confer the structural flexibility required for fusion-pore opening and expansion [#24], while the membrane-proximal C-termini of VAMP2 and SNAP25 are clamped by the complexin accessory helix to suppress premature spontaneous fusion [#27]. VAMP2 is sorted onto synaptic vesicles through direct interaction with synaptophysin I [#8] and retrieved from the plasma membrane by the dedicated endocytic adaptors AP180 and CALM, which maintain the vesicular VAMP2 pool needed for sustained neurotransmission and vesicle reformation [#23, #11]. Beyond neurons, VAMP2 acts as the v-SNARE for insulin-stimulated GLUT4 translocation in concert with the t-SNAREs syntaxin-4 and SNAP23, functioning specifically in the fusion step downstream of vesicle tethering and downstream of PKCzeta-mediated serine phosphorylation [#1, #7, #17, #16], and similarly drives AQP2, NKCC2, and renin trafficking in kidney, ANP and surfactant secretion, and VAMP2/3-dependent membrane expansion that powers oligodendrocyte myelination [#3, #22, #19, #31]. VAMP2 also engages alpha-synuclein through its juxtamembrane domain to nucleate a multi-component condensed phase that clusters synaptic vesicles, promotes SNARE assembly, and protects alpha-synuclein from aggregation [#32, #33]. Heterozygous de novo mutations in the C-terminal SNARE motif of VAMP2 impair vesicle fusion and cause a neurodevelopmental disorder with hypotonia, intellectual disability, and autistic features [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that VAMP2 is functionally required for a specific regulated exocytic pathway rather than constitutive secretion, defining its role as a Ca2+-pathway v-SNARE outside neurons.\",\n      \"evidence\": \"Neurotoxin cleavage in permeabilized beta-cells and kidney collecting duct, with secretion and AQP2-vesicle co-localization readouts\",\n      \"pmids\": [\"7796801\", \"7560075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the cognate t-SNAREs in non-neuronal tissues\", \"Mechanism of Ca2+-dependence not addressed at the molecular level\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the non-neuronal SNARE partners of VAMP2 and showed phosphorylation can regulate complex assembly, extending the v-SNARE function to the GLUT4 trafficking machinery.\",\n      \"evidence\": \"In vitro binary binding assays of VAMP2 with syntaxin-4 and SNAP23 plus kinase treatment; dominant-negative and co-IP studies in adipocytes/myoblasts\",\n      \"pmids\": [\"9111311\", \"8707843\", \"9693005\", \"10888677\", \"10713150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether tethering versus fusion steps are separable was not yet distinguished\", \"In vivo phosphosite on VAMP2 itself not mapped\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Linked a signaling kinase to VAMP2-dependent GLUT4 exocytosis, providing an insulin-responsive regulatory input on the v-SNARE.\",\n      \"evidence\": \"PKCzeta gain- and loss-of-function with phosphoserine IP and glucose transport assays; later ProF adaptor co-IP and in vitro kinase assay\",\n      \"pmids\": [\"11604519\", \"17313651\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Exact phosphorylated residue(s) on VAMP2 not definitively identified\", \"Functional consequence of VAMP2 phosphorylation on fusion not directly measured\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified synaptophysin I as the sorting determinant that targets VAMP2 to synaptic vesicles, answering how VAMP2 enters the regulated rather than constitutive pathway.\",\n      \"evidence\": \"Fluorescent chimera live imaging, co-IP, and dose-response in hippocampal neurons; follow-up with trafficking mutants in non-neuronal cells\",\n      \"pmids\": [\"14528015\", \"17331077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the SypI-VAMP2 cytoplasmic interaction not resolved\", \"Whether SypI sorting operates in non-neuronal secretory cells not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided atomic detail of how clostridial neurotoxins recognize and cleave VAMP2, explaining the substrate specificity exploited throughout the functional literature.\",\n      \"evidence\": \"1.65 A crystal structure of BoNT/D light chain with comparison to BoNT/F\",\n      \"pmids\": [\"16519520\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address VAMP2's own fusion mechanism\", \"Structure of VAMP2 within an assembled SNARE complex not provided here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified CALM and later AP180 as VAMP2-specific endocytic adaptors, establishing the recycling arm that replenishes the vesicular VAMP2 pool.\",\n      \"evidence\": \"ANTH-domain overexpression/RNAi/dominant-negative for CALM; AP180 knockout and AP180-/-/Syb2+/- genetic interaction with electrophysiology and EM\",\n      \"pmids\": [\"18182011\", \"26412491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Recognition motif on VAMP2 for the ANTH domain not mapped\", \"Relative contributions of CALM versus AP180 in different neuron types unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed Munc18 isoforms and complexin act as opposing regulators on the VAMP2-containing SNARE complex, defining checkpoints in fusion control.\",\n      \"evidence\": \"Reconstituted liposome fusion with Munc18c inhibition; EPR of complexin-SNARE complex; co-IP electrophysiology of VAMP2-Kv2.1\",\n      \"pmids\": [\"19116655\", \"20026076\", \"18542995\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Munc18 inhibition is converted to stimulation in vivo not resolved in these studies\", \"Functional outcome of complexin accessory-helix displacement not yet tested in cells\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Separated VAMP2's role from t-SNARE function by showing VAMP2 is dispensable for vesicle tethering but essential for the fusion step itself.\",\n      \"evidence\": \"RNAi of VAMP2 versus syntaxin-4/SNAP23 with TIRF-based tethering and fusion assays in adipocytes\",\n      \"pmids\": [\"20006577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular trigger coupling tethering to VAMP2-driven fusion not defined\", \"Did not address whether this division applies to neuronal fusion\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated that the VAMP2 transmembrane domain actively shapes the fusion pore, moving VAMP2's role beyond cytoplasmic SNARE zippering.\",\n      \"evidence\": \"G100V/C103V mutagenesis with infrared spectroscopy, membrane capacitance, TIRF, and ATP release\",\n      \"pmids\": [\"28588281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution view of the transmembrane helix-to-sheet transition not obtained\", \"Generalizability across vesicle types not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved how the membrane environment and Munc18-1 templating control VAMP2 conformation to prime SNARE assembly, and refined the complexin clamp on the VAMP2 C-terminus.\",\n      \"evidence\": \"In-cell NMR plus lipidomics; Munc18-1 photo-cross-linking and reconstituted fusion with neuronal rescue; complexin photo-cross-linking with electrophysiology\",\n      \"pmids\": [\"32210233\", \"33055194\", \"32698012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How raft-mediated release and Munc18 templating are temporally coordinated in vivo unclear\", \"Quantitative kinetics of conformational switching not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected VAMP2 SNARE-motif function to human disease, showing that fusion-impairing variants cause a neurodevelopmental disorder.\",\n      \"evidence\": \"De novo mutation identification in patients with reconstituted lipid-mixing fusion validation\",\n      \"pmids\": [\"30929742\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular and circuit-level consequences of each variant not characterized\", \"Limited mechanistic detail on how each substitution disrupts fusion\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended VAMP2 function to developmental membrane biology by showing VAMP2/3 exocytosis powers oligodendrocyte myelin membrane expansion and node-of-Ranvier formation.\",\n      \"evidence\": \"Conditional VAMP2/3 knockout and toxin-mediated cleavage in oligodendrocyte lineage with live imaging, proteomics, and EM\",\n      \"pmids\": [\"36151203\", \"37620160\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The t-SNARE partners at the oligodendrocyte surface not defined\", \"Cargo specificity of myelin-directed exocytosis incompletely mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a chaperone-like role in which the VAMP2 juxtamembrane domain drives alpha-synuclein phase separation that clusters vesicles, promotes SNARE assembly, and protects against alpha-synuclein aggregation.\",\n      \"evidence\": \"In vitro and in-cell condensate assays with charged-residue mutagenesis, SV clustering, SNARE assembly, and aggregation kinetics; concordant findings across two papers\",\n      \"pmids\": [\"38951707\", \"38951706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological regulation of condensate assembly/disassembly unknown\", \"Relationship between condensate state and disease aggregation in vivo not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How VAMP2's distinct membrane-fusion, cargo-sorting, condensate-forming, and autophagy/nucleophagy (FIP200-dependent) functions are differentially deployed across cell types and developmental contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model links VAMP2 conformational state to choice among fusion, sorting, and condensate pathways\", \"DCV-specific and FIP200/nucleophagy mechanisms only partially characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 17, 28]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [26]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 3, 8, 40]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11, 17, 38]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [30, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [1, 6, 22, 17]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 17, 19, 24]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [23, 27, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [31, 34, 43]}\n    ],\n    \"complexes\": [\"SNARE complex (VAMP2/syntaxin-4/SNAP23)\", \"neuronal SNARE complex (VAMP2/syntaxin-1/SNAP25)\"],\n    \"partners\": [\"SNAP23\", \"STX4\", \"Munc18-1 (STXBP1)\", \"STXBP3 (Munc18c)\", \"complexin\", \"SYP\", \"AP180\", \"PICALM\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}