Synaptic vesicles position complexin to block spontaneous fusion.

Synaptic vesicles position complexin to block spontaneous fusion.
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DOI:
10.1016/j.neuron.2012.11.005
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发表时间:
2013-01-23
期刊:
影响因子:
16.2
通讯作者:
Dittman JS
Dittman JS
中科院分区:
医学1区
文献类型:
--
作者:
Wragg RT;Snead D;Dong Y;Ramlall TF;Menon I;Bai J;Eliezer D;Dittman JS

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Synapses continually replenish their synaptic vesicle (SV) pools while suppressing spontaneous fusion events, thus maintaining a high dynamic range in response to physiological stimuli. The presynaptic protein complexin can both promote and inhibit fusion through interactions between its alpha-helical domain and the SNARE complex. In addition, complexin’s C-terminal half is required for the inhibition of spontaneous fusion in worm, fly, and mouse, although the molecular mechanism remains unexplained. We show here that complexin’s C-terminal domain binds lipids through a novel protein motif, permitting complexin to inhibit spontaneous exocytosis in vivo by targeting complexin to SVs. We propose that the SV pool serves as a platform to sequester and position complexin where it can intercept the rapidly assembling SNAREs and control the rate of spontaneous fusion.
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