Synaptic vesicle release machinery

The synaptic vesicle release machinery comprises a network of interacting proteins that regulate all steps of neurotransmitter exocytosis at presynaptic nerve terminals. The central component is the SNARE complex, consisting of Syntaxin-1, Synaptobrevin (VAMP2), and SNAP-25, which drives membrane fusion between synaptic vesicles and the presynaptic membrane. This process is tightly regulated by proteins such as Synaptotagmin-1 (the calcium sensor for fast release), Complexin (fusion clamp/activator), Munc13 (priming factor), Munc18 (SNARE chaperone), and Synaptophysin (vesicle trafficking regulator)[1][3][4][5][6][8]. Disruption in the function or balance of these proteins leads to severe defects in synaptic transmission and is implicated in multiple neurological and psychiatric disorders[5]. The machinery is a target for bacterial neurotoxins but not for approved therapeutics.

Other names

Synaptic fusion machinerySNARE complex and associated proteinsNeurotransmitter release machinery

Proteolytic cleavage of SNARE proteins (e.g., botulinum and tetanus toxins inhibit vesicular fusion by cleaving SNAREs) Inhibition of SNARE complex assembly and exocytosis