托莫辛斯通过与含有VAMP2的模板复合体结合来减弱SNARE组合和突触抑制
Marieke Meijer1, Miriam Öttl2, Jie Yang3
1Department of Human Genetics, Center for Neurogenomics and Cognitive Research, Amsterdam University Medical Center, 1081HV, Amsterdam, The Netherlands. m.meijer@vu.nl.
Nature communications
|March 27, 2024
概括
在SNARE复杂组装方面,Tomosyns与synaptobrevin-2/VAMP2没有竞争. 相反,tomosyns与synaptobrevin-2/VAMP2合作,通过防止SNAP-25结合来限制突触强度.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 托莫辛是膜融合的调节者,特别是在突触囊泡外细胞化中.
- 他们提出的机制涉及与synaptobrevin-2/VAMP2竞争SNARE复杂组装.
研究的目的:
- 调查托莫辛斯调节膜融合和突触传播的精确机制.
- 挑战SNARE复杂组装中的tomosyn函数的主流模型.
主要方法:
- 产生和分析一种新的tomosyn-1/2缺乏的小鼠模型.
- 使用野生类型和突变的tomosyn-1m的救援实验.
- 测量单分子力,以评估蛋白质相互作用.
- 在tomosyn领域的结构功能分析.
主要成果:
- 托莫辛-1/2缺乏会增加突触囊泡融合概率和突触强度.
- 在形成必不可少的SNARE组装中间体时,Tomosyn的SNARE图案不能替代synaptobrevin-2/VAMP2.
- 托莫辛与含有synaptobrevin-2/VAMP2的复合物结合,并抑制SNAP-25的结合.
- 托莫辛的C端多基区域有助于其抑制功能.
结论:
- 在最初的SNARE复合体形成方面,Tomosyns与synaptobrevin-2/VAMP2没有竞争.
- 托莫辛素通过阻止SNAP-25与含有synaptobrevin-2/VAMP2的复合体结合来调节突触传输.
- 这种机制限制了最初的突触强度,并确保了持续刺激期间的均衡.
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