A synaptotagmin suppressor screen indicates SNARE binding controls the timing and Ca²⁺ cooperativity of vesicle fusion.

ABSTRACT: The synaptic vesicle Ca²⁺ sensor Synaptotagmin binds Ca²⁺ through its two C2 domains to trigger membrane interactions. Beyond membrane insertion by the C2 domains, other requirements for Synaptotagmin activity are still being elucidated. To identify key residues within Synaptotagmin required for vesicle cycling, we took advantage of observations that mutations in the C2B domain Ca²⁺-binding pocket dominantly disrupt release from invertebrates to humans. We performed an intragenic screen for suppressors of lethality induced by expression of Synaptotagmin C2B Ca²⁺-binding mutants in Drosophila. This screen uncovered essential residues within Synaptotagmin that suggest a structural basis for several activities required for fusion, including a

SUBMITTER: Guan Z 

PROVIDER: S-EPMC5617632 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature