Assembly-promoting protein Munc18c stimulates SNARE-dependent membrane fusion through its SNARE-like peptide.

Assembly-promoting protein Munc18c stimulates SNARE-dependent membrane fusion through its SNARE-like peptide.
复制标题

组装促进蛋白 Munc18c 通过其 SNARE 样肽刺激 SNARE 依赖性膜融合

DOI:
10.1016/j.jbc.2022.102470
复制
发表时间:
2022-10
影响因子:
4.8
通讯作者:
Yu, Haijia
Yu, Haijia
中科院分区:
生物学2区
文献类型:
--
作者:
Liu, Furong;He, Ruyue;Zhu, Min;Zhou, Lin;Liu, Yinghui;Yu, Haijia

文献摘要

参考文献

相似文献

胞内囊泡融合需要可溶性N-乙基马来酰亚胺敏感因子附着蛋白受体(SNARE)及其同源Sec 1/Munc 18(SM)蛋白。SM蛋白如何与trans-SNARE复合物协同作用以促进膜融合仍不完全清楚。Munc 18 c是一种广泛分布的SM蛋白,选择性调节多种胞吐途径,包括GLUT 4胞吐。在这里,使用体外重建系统,我们发现了一个SNARE样肽(SLP),保守的Munc 18 -1的突触胞吐,是至关重要的刺激活动的Munc 18 c在囊泡融合。SLP对SNARE介导的融合反应的直接刺激进一步支持了该片段的重要作用。有趣的是,我们发现SLP在锚定到靶膜而不是囊泡膜时强烈加速膜融合速率,这表明它主要与t-SNARE顺式相互作用以驱动融合。此外,我们确定SLP片段与全长Munc 18 c蛋白竞争,并且对同源v-SNARE同种型具有特异性,支持它如何在膜融合中类似于Munc 18 c的活性。总之,我们的研究结果表明,Munc 18 c通过SLP促进SNARE依赖的膜融合,揭示了t-SNARE-SLP结合模式可能是SM蛋白在囊泡融合中刺激功能的保守机制。
Intracellular vesicle fusion requires the soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) and their cognate Sec1/Munc18 (SM) proteins. How SM proteins act in concert with trans-SNARE complexes to promote membrane fusion remains incompletely understood. Munc18c, a broadly distributed SM protein, selectively regulates multiple exocytotic pathways, including GLUT4 exocytosis. Here, using an in vitro reconstituted system, we discovered a SNARE-like peptide (SLP), conserved in Munc18-1 of synaptic exocytosis, is crucial to the stimulatory activity of Munc18c in vesicle fusion. The direct stimulation of the SNARE-mediated fusion reaction by SLP further supported the essential role of this fragment. Interestingly, we found SLP strongly accelerates the membrane fusion rate when anchored to the target membrane but not the vesicle membrane, suggesting it primarily interacts with t-SNAREs in cis to drive fusion. Furthermore, we determined the SLP fragment is competitive with the full-length Munc18c protein and specific to the cognate v-SNARE isoforms, supporting how it could resemble Munc18c’s activity in membrane fusion. Together, our findings demonstrate that Munc18c facilitates SNARE-dependent membrane fusion through SLP, revealing that the t-SNARE-SLP binding mode might be a conserved mechanism for the stimulatory function of SM proteins in vesicle fusion.
DOI: 10.1126/science.1224492
发表时间: 2012-09-14
期刊: Science (New York, N.Y.)
影响因子: --
作者:
Gao Y;Zorman S;Gundersen G;Xi Z;Ma L;Sirinakis G;Rothman JE;Zhang Y
通讯作者: Zhang Y
DOI: 10.1083/jcb.201007176
发表时间: 2011-04-04
期刊: The Journal of cell biology
影响因子: --
作者:
Jewell JL;Oh E;Ramalingam L;Kalwat MA;Tagliabracci VS;Tackett L;Elmendorf JS;Thurmond DC
通讯作者: Thurmond DC
DOI: 10.1038/nm.4350
发表时间: 2017-07-11
期刊: Nature medicine
影响因子: 82.9
作者:
Czech MP
通讯作者: Czech MP
DOI: 10.1242/jcs.126862
发表时间: 2013-06-01
影响因子: 4
作者:
Han, Gayoung Anna;Bin, Na-Ryum;Sugita, Shuzo
通讯作者: Sugita, Shuzo
DOI: 10.1073/pnas.1116975109
发表时间: 2012-06-19
影响因子: 11.1
作者:
Christie, Michelle P.;Whitten, Andrew E.;Martin, Jennifer L.
通讯作者: Martin, Jennifer L.