Complexin induces a conformational change at the membrane-proximal C-terminal end of the SNARE complex.

Abstract:

:Complexin regulates spontaneous and activates Ca(2+)-triggered neurotransmitter release, yet the molecular mechanisms are still unclear. Here we performed single molecule fluorescence resonance energy transfer experiments and uncovered two conformations of complexin-1 bound to the ternary SNARE complex. In the cis conformation, complexin-1 induces a conformational change at the membrane-proximal C-terminal end of the ternary SNARE complex that specifically depends on the N-terminal, accessory, and central domains of complexin-1. The complexin-1 induced conformation of the ternary SNARE complex may be related to a conformation that is juxtaposing the synaptic vesicle and plasma membranes. In the trans conformation, complexin-1 can simultaneously interact with a ternary SNARE complex via the central domain and a binary SNARE complex consisting of syntaxin-1A and SNAP-25A via the accessory domain. The cis conformation may be involved in activation of synchronous neurotransmitter release, whereas both conformations may be involved in regulating spontaneous release.

journal_name

Elife

journal_title

eLife

authors

Choi UB,Zhao M,Zhang Y,Lai Y,Brunger AT

doi

10.7554/eLife.16886

subject

Has Abstract

pub_date

2016-06-02 00:00:00

issn

2050-084X

journal_volume

5

pub_type

杂志文章

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