A Stimulation Function of Synaptotagmin-1 in Ternary SNARE Complex Formation Dependent on Munc18 and Munc13.

A Stimulation Function of Synaptotagmin-1 in Ternary SNARE Complex Formation Dependent on Munc18 and Munc13.
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Synaptotagmin-1 在三元 SNARE 复合体形成中的刺激功能依赖于 Munc18 和 Munc13。

DOI:
10.3389/fnmol.2017.00256
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发表时间:
2017
影响因子:
4.8
通讯作者:
Ma C
Ma C
中科院分区:
医学2区
文献类型:
--
作者:
Li Y;Wang S;Li T;Zhu L;Xu Y;Ma C

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钙离子传感器突触结合蛋白1(Syt1)在突触胞吐作用中起着至关重要的作用。近期,Syt1被认为与突触小泡启动有关,这是钙离子触发膜融合之前的一个成熟步骤,据信该步骤涉及三元SNARE复合物的形成,并且需要启动蛋白Munc18 - 1和Munc13 - 1。然而,Syt1在突触小泡启动中的作用机制仍不清楚。在本研究中,我们发现Syt1刺激由Munc13 - 1催化的从Munc18 - 1/突触融合蛋白1复合物向三元SNARE复合物的转变。这种刺激在含有膜的环境中可进一步增强。此外,我们表明Syt1与Munc18 - 1和Munc13 - 1一起,以一种抵抗解聚因子NSF和α - SNAP的方式刺激膜上反式三元SNARE复合物的形成。破坏一个提出的Syt1/SNARE结合界面强烈地消除了Syt1的刺激功能。我们的研究结果表明,Syt1与含有Munc18 - 1和Munc13 - 1的中间SNARE组装体的结合对于Syt1在三元SNARE复合物形成中的刺激功能至关重要,并且这种刺激可能是Syt1在突触胞吐作用中启动功能的基础。
The Ca2+ sensor synaptotagmin-1 (Syt1) plays an essential function in synaptic exocytosis. Recently, Syt1 has been implicated in synaptic vesicle priming, a maturation step prior to Ca2+-triggered membrane fusion that is believed to involve formation of the ternary SNARE complex and require priming proteins Munc18-1 and Munc13-1. However, the mechanisms of Syt1 in synaptic vesicle priming are still unclear. In this study, we found that Syt1 stimulates the transition from the Munc18-1/syntaxin-1 complex to the ternary SNARE complex catalyzed by Munc13-1. This stimulation can be further enhanced in a membrane-containing environment. Further, we showed that Syt1, together with Munc18-1 and Munc13-1, stimulates trans ternary SNARE complex formation on membranes in a manner resistant to disassembly factors NSF and α-SNAP. Disruption of a proposed Syt1/SNARE binding interface strongly abrogated the stimulation function of Syt1. Our results suggest that binding of Syt1 to an intermediate SNARE assembly with Munc18-1 and Munc13-1 is critical for the stimulation function of Syt1 in ternary SNARE complex formation, and this stimulation may underlie the priming function of Syt1 in synaptic exocytosis.
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