The primed SNARE-complexin-synaptotagmin complex for neuronal exocytosis.

The primed SNARE-complexin-synaptotagmin complex for neuronal exocytosis.
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DOI:
10.1038/nature23484
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发表时间:
2017-08-24
期刊:
影响因子:
64.8
通讯作者:
Brunger AT
Brunger AT
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhou Q;Zhou P;Wang AL;Wu D;Zhao M;Südhof TC;Brunger AT

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Synaptotagmin、complexin和neuronal SNARE蛋白介导诱发的同步神经递质释放,但介导这些分子之间合作的分子机制尚不清楚。在这里,我们确定了引发的融合前SNARE-复合蛋白-突触结合蛋白-1复合物的晶体结构。这些结构揭示了一个意想不到的三方之间的界面synaptotagmin-1和SNARE复合物和complexin。同时,第二个突触结合蛋白-1分子通过先前确定的主要界面与SNARE复合物的另一侧相互作用。在溶液中破坏任一界面的突变也严重损害了神经元中的诱发同步释放,这表明两个界面对于引发的融合前状态是必不可少的。结合到突触结合蛋白-1分子的Ca 2+解锁复合物,允许SNARE复合物完全拉链化,并触发膜融合。在突触囊泡对接位点的三重SNARE-复合蛋白-突触结合蛋白-1复合物必须解锁以开始触发融合,这解释了复合蛋白和突触结合蛋白-1在亚毫秒时间尺度上同步诱发释放中的合作。
Synaptotagmin, complexin and neuronal SNARE proteins mediate evoked synchronous neurotransmitter release, but the molecular mechanisms mediating the cooperation between these molecules remain unclear. Here, we determined crystal structures of the primed pre-fusion SNARE-complexin-synaptotagmin-1 complex. These structures reveal an unexpected tripartite interface between synaptotagmin-1 and both the SNARE complex and complexin. Simultaneously, a second synaptotagmin-1 molecule interacted with the other side of the SNARE complex via the previously identified primary interface. Mutations that disrupt either interface in solution also severely impaired evoked synchronous release in neurons, suggesting that both interfaces are essential for the primed pre-fusion state. Ca2+ binding to the synaptotagmin-1 molecules unlocks the complex, allows full zippering of the SNARE complex, and triggers membrane fusion. The tripartite SNARE-complexin-synaptotagmin-1 complex at a synaptic vesicle docking site has to be unlocked for triggered fusion to commence, explaining the cooperation between complexin and synaptotagmin-1 in synchronizing evoked release on the sub-millisecond timescale.
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