Synaptotagmin 1 clamps synaptic vesicle fusion in mammalian neurons independent of complexin

Abstract

The molecular identity of the clamp that arrests the fusion machinery such that synaptic vesicles are docked and primed to release neurotransmitters remains controversial. In this study, the authors use truncation mutants of synaptotagmin (syt) 1 and animal models to demonstrate that the C2B domain of syt1, and not complexin, is solely responsible for the reduction of the spontaneous release at the presynapse