Protein Name: VAMP2 (Vesicle-Associated Membrane Protein 2)
Gene Symbol: VAMP2
UniProt ID: P60880
Molecular Weight: 12.6 kDa
PDB IDs: 1KA7, 1K5N, 2QNO, 5W5D
Subcellular Localization: Synaptic vesicles, presynaptic terminals, endocrine secretory granules
VAMP2 (also called Synaptobrevin-2) is a small, type IV membrane protein:
- N-terminal region (residues 1-60): Proline-rich, flexible
- SNARE motif (residues 1-60): Central region forming the v-SNARE
- Transmembrane region (residues 61-80): C-terminal anchor embedded in vesicle membrane
VAMP2 contributes the central "ionic" layer (0 layer) containing arginine (R) that pairs with glutamine (Q) in syntaxin:
- Forms the "ball" of the "ball-and-chain" SNARE pin
- Critical for membrane fusion kinetics
VAMP2 is the primary v-SNARE protein for synaptic vesicle fusion:
- Vesicle Docking: VAMP2 on vesicles pairs with syntaxin-1A on plasma membrane
- SNARE Complex Assembly: SNAP-25 binds to form the four-helix SNARE bundle
- Fusion Pore Formation: Partial assembly drives fusion pore opening
- Fusion Completion: Full zippering pulls membranes together
- VAMP2 deletion eliminates fast synchronous release (PMID: 9852052)
- Mutant VAMP2 with impaired fusion pore function reduces quantal size (PMID: 11179424)
- VAMP2 is recycled via clathrin-mediated endocytosis after fusion
- Synaptojanin and dynamin regulate VAMP2 retrieval
- Alpha-synuclein binds VAMP2 and inhibits SNARE complex assembly (PMID: 19165150)
- Mutations affecting VAMP2 trafficking may contribute to PD pathogenesis
- Restoring VAMP2 function rescues synaptic transmission in PD models
- Botulinum neurotoxin B and D cleave VAMP2, blocking acetylcholine release (PMID: 1348367)
- Understanding VAMP2 cleavage informs therapeutic botulinum toxin development
- SNARE Stabilizers: Small molecules enhancing VAMP2 incorporation into SNARE complexes
- Protease Inhibitors: Blocking VAMP2 cleavage in pathological states
- Gene Therapy: Restoring VAMP2 expression in neurodegenerative conditions