VAMP3 (Vesicle-Associated Membrane Protein 3), also known as Cellubrevin, is a member of the SNARE (Soluble N-ethylmaleimide-sensitive factor Attachment Protein Receptor) family of proteins. VAMP3 functions as a v-SNARE (vesicular SNARE) protein that mediates vesicle fusion with target membranes during intracellular trafficking, synaptic vesicle release, and endosomal recycling. [1]
| VAMP3 Protein | |
|---|---|
| Protein Name | VAMP3 (Cellubrevin) |
| Gene Symbol | VAMP3 |
| Gene | [VAMP3 Gene](/genes/vamp3) |
| UniProt ID | [Q15886](https://www.uniprot.org/uniprot/Q15886) |
| Protein Family | SNARE family, VAMP subfamily |
| Molecular Weight | 11.5 kDa (100 amino acids) |
| Subcellular Location | Synaptic vesicles, endosomes, plasma membrane |
| Expression | Ubiquitous; high in brain, endocrine cells |
VAMP3 contains the characteristic SNARE domain structure:
| Region | Position | Function |
|---|---|---|
| N-terminal regulatory region | 1-25 aa | Hypervariable N-terminus; regulation of SNARE complex assembly |
| SNARE motif (central) | 26-72 aa | Formation of the coiled-coil SNARE complex |
| Transmembrane anchor | 73-100 aa | C-terminal transmembrane helix; membrane anchoring |
The SNARE motif consists of 16-18 heptad repeats that form a highly stable four-helix bundle when complexed with other SNARE proteins.
During vesicle fusion, VAMP3 (v-SNARE) pairs with target membrane SNAREs (t-SNAREs) to form the SNARE complex:
The formation of this highly stable complex drives membrane fusion through the release of free energy. [@rizi_snare2018]
VAMP3 plays essential roles in neurotransmitter release: [2]
Beyond synaptic function, VAMP3 participates in: [@kranes2019]
SNARE dysfunction is a key feature of Alzheimer's disease: [3]
Synaptic dysfunction is increasingly recognized in PD:
VAMP3 interacts with multiple SNARE and regulatory proteins:
| Interactor | Interaction Type | Functional Relevance |
|---|---|---|
| SNAP25 | SNARE complex | Synaptic vesicle fusion |
| SNAP23 | SNARE complex | Non-synaptic fusion |
| Syntaxin 1/4 | SNARE complex | Target membrane t-SNARE |
| Munc18 | Regulatory | Syntaxin chaperone, fusion regulation |
| Munc13 | Regulatory | Active zone organization |
| Synaptotagmin | Calcium sensor | Calcium-triggered release |
| α-Synuclein | Binding | Potential regulatory interaction |
| Vti1A | Alternate SNARE | Endosomal SNARE complex |
Targeting SNARE dysfunction represents a therapeutic strategy for neurodegenerative diseases: [4]
VAMP3 (Cellubrevin) is a v-SNARE protein essential for synaptic vesicle trafficking and neurotransmitter release. In Alzheimer's disease, VAMP3 dysfunction contributes to synaptic failure, one of the earliest and most critical pathological features. Similarly, in Parkinson's disease and other neurodegenerative conditions, impaired SNARE-mediated vesicle trafficking represents a key mechanism of synaptic dysfunction. Understanding VAMP3 and SNARE biology provides insight into therapeutic strategies targeting synaptic protection and restoration.
Jahn R, Scheller RH. VAMP proteins - from vesicular fusion to synaptic transmission. Nat Rev Neurosci. 2006. ↩︎
Kelley KW, Chapman ER. Synaptic vesicle trafficking in health and disease. Neuron. 2022. ↩︎
Selkoe DJ. Alzheimer's disease is a synaptic failure. Science. 2002. ↩︎
Vandrovcova M, Gacki M, Vitek S, et al. SNARE complex dysfunction in neurodegenerative diseases. Mol Neurobiol. 2018. ↩︎