Molecular Mechanisms of Synaptic Vesicle Priming by Munc13 and Munc18.

Molecular Mechanisms of Synaptic Vesicle Priming by Munc13 and Munc18.
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DOI:
10.1016/j.neuron.2017.07.004
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发表时间:
2017-08-02
期刊:
影响因子:
16.2
通讯作者:
Brunger AT
Brunger AT
中科院分区:
医学1区
文献类型:
--
作者:
Lai Y;Choi UB;Leitz J;Rhee HJ;Lee C;Altas B;Zhao M;Pfuetzner RA;Wang AL;Brose N;Rhee J;Brunger AT

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Munc 13催化突触融合蛋白从与Munc 18的封闭复合物转变为三元SNARE复合物。在这里,我们报告了一个新的功能Munc 13,独立的Munc 18:它促进了正确的syntaxin / synaptobrevin子配置组装过程中的三元陷阱复合物。在与Munc 18的合作中,Munc 13额外地确保了正确的syntaxin / SNAP-25子配置。在与SNARE,复合蛋白,和synaptotagmin的重建融合试验中,包括Munc 13和Munc 18四倍的Ca 2+触发的振幅,并实现接近生理浓度的Ca 2+敏感性。在Munc 13 -1/2双敲除神经元中,突触融合蛋白的组成性开放突变体的表达相对于Munc 13 -1拯救只能最低限度地恢复神经递质释放。总之,Munc 13的生理功能可能与调节适当的SNARE复合物组装有关。
Munc13 catalyzes the transit of syntaxin from a closed complex with Munc18 into the ternary SNARE complex. Here we report a new function of Munc13, independent of Munc18: it promotes the proper syntaxin / synaptobrevin subconfiguration during assembly of the ternary SNARE complex. In cooperation with Munc18, Munc13 additionally ensures the proper syntaxin / SNAP-25 subconfiguration. In a reconstituted fusion assay with SNAREs, complexin, and synaptotagmin, inclusion of both Munc13 and Munc18 quadruples the Ca2+-triggered amplitude and achieves Ca2+-sensitivity near physiological concentrations. In Munc13-1/2 double-knockout neurons, expression of a constitutively open mutant of syntaxin could only minimally restore neurotransmitter release relative to Munc13-1 rescue. Together, the physiological functions of Munc13 may be related to regulation of proper SNARE complex assembly.
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