Munc18-1 mutations that strongly impair SNARE-complex binding support normal synaptic transmission

Munc18-1 mutations that strongly impair SNARE-complex binding support normal synaptic transmission
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DOI:
10.1038/emboj.2012.72
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发表时间:
2012-05-02
期刊:
影响因子:
11.4
通讯作者:
Verhage, Matthijs
Verhage, Matthijs
中科院分区:
生物学1区
文献类型:
--
作者:
Meijer, Marieke;Burkhardt, Pawel;Verhage, Matthijs

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突触传递关键取决于 Sec1p/Munc18 蛋白 Munc18-1,但尚不清楚 Munc18-1 是否主要作为融合机制的组成部分发挥作用,还是在融合复合物组装中发挥更上游的作用。在这里,我们发现 Munc18-1 中的点突变会干扰与游离 Syntaxin1a N 端的结合,并强烈损害与组装的 SNARE 复合物的结合,所有这些点突变都支持突触小泡的正常对接、启动和融合,以及 munc18-1 无效突变神经元中的正常突触可塑性。这些数据支持 Munc18-1 在 SNARE 复合体组装之前/期间的主要作用,而其与组装的 SNARE 复合体的持续关联对于突触传递来说是可有可无的。 EMBO 杂志 (2012) 31, 2156-2168。 doi:10.1038/emboj.2012.72; 2012 年 3 月 23 日在线发布
Synaptic transmission depends critically on the Sec1p/Munc18 protein Munc18-1, but it is unclear whether Munc18-1 primarily operates as a integral part of the fusion machinery or has a more upstream role in fusion complex assembly. Here, we show that point mutations in Munc18-1 that interfere with binding to the free Syntaxin1a N-terminus and strongly impair binding to assembled SNARE complexes all support normal docking, priming and fusion of synaptic vesicles, and normal synaptic plasticity in munc18-1 null mutant neurons. These data support a prevailing role of Munc18-1 before/during SNARE-complex assembly, while its continued association to assembled SNARE complexes is dispensable for synaptic transmission. The EMBO Journal (2012) 31, 2156-2168. doi:10.1038/emboj.2012.72; Published online 23 March 2012