通过Shank3对CaV 1.3 L型通道进行集群
Qian Yang1, Tyler L Perfitt1, Juliana Quay2
1Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medcine - Basic Sciences, Nashville, Tennessee, USA.
Journal of neurochemistry
|July 1, 2023
概括
后突触支架蛋白Shank3促进细胞膜L型电压通道 (LTCC) 的聚合. 的涌入破坏了这种Shank3-LTCC相互作用,减少了道集群强度.
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:
- 集群的L型电压通道 (LTCCs) 形成局部Ca2+信号纳米域,对细胞过程至关重要.
- 驱动LTCC集群的分子机制在很大程度上是未知的.
- 后突触支架蛋白Shank3与CaV1.3通道相互作用,对于激发-转录合至关重要.
研究的目的:
- 调查Shank3在CaV1.3 LTCCs聚类中的作用.
- 阐明LTCC集群的基础分子机制及其通过Ca2+的调节.
主要方法:
- 在HEK细胞中进行共免疫沉试验,以评估Shank3-CaV1.3相互作用和复杂组合.
- 活细胞成像观察LTCC集群和完整细胞中的Shank3定位.
- Shank3 PDZ域删除突变体用于识别关键交互域.
- 在初级海马体神经元中,shRNA介导的Shank3被淘汰.
主要成果:
- 在基底条件下,Shank3促进了由CaVβ子单元促进的多重CaV1.3 LTCC复合物的组装.
- 对细胞溶解酸的Ca2+添加破坏了Shank3-CaV1.3相互作用和CaV1.3复合体组合.
- 在完整的细胞中,Shank3基本上增强了CaV1.3 LTCC膜,但Ca2+流入使Shank3分离,并降低了强度.
- 删除Shank3 PDZ域取消了CaV1.3结合并改变了复杂组合.
- 在神经元中Shank3敲击降低了表面CaV1.3 LTCC在树突中的集群强度.
结论:
- 在基底条件下,Shank3是CaV1.3 LTCC在血膜上的聚合的关键调节者.
- Ca2+的涌入触发了Shank3-CaV1.3相互作用的解离,调节了LTCC集群动态.
- 这项研究揭示了涉及Shank3的LTCC聚类的新型机制,以及其通过细胞内Ca2+的调节.
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