人类泄漏通道NALCN的结构
Marc Kschonsak1, Han Chow Chua2, Cameron L Noland1
1Department of Structural Biology, Genentech Inc., San Francisco, CA, USA.
Nature
|July 23, 2020
概括
用FAM155A确定了关键的神经元刺激性的NALCN通道的结构. 这揭示了突变如何导致神经系统疾病,并为NALCN通道病症提供了点.
科学领域:
- 神经科学
- 分子生物学
- 结构生物学
背景情况:
- (Na+) 泄漏电流对于神经元的电刺激至关重要.
- 非选择性电压通道 (NALCN) 是神经元中的主要背景Na+通道.
- NALCN调节关键的生理功能,其功能障碍导致严重的神经障碍.
研究的目的:
- 阐明NALCN通道及其辅助子单位FAM155A的结构.
- 了解NALCN关,离子选择性和药理学的分子机制.
- 为NALCN通道病变提供结构基础.
主要方法:
- 用冷电子显微镜 (Cryo-EM) 确定NALCN-FAM155A复合物的结构.
- 结构分析以确定关键的功能区域,包括离子选择性过器,孔隙和电压传感器领域.
- 对患者的突变部位与确定结构的分析.
主要成果:
- 确定了与FAM155A复合的NALCN结构,揭示了FAM155A在遮选择性波器中的作用.
- NALCN中心腔被堵塞的侧孔堵塞,影响了它的药理学.
- 不对称的电压传感器域表明新的调制机制, 患者的突变聚集在一个封闭的孔门周围.
结论:
- 这项研究提供了关于NALCN通道及其与FAM155A相互作用的首次结构见解.
- 了解NALCN结构为研究其生理学和开发NALCN通道病症的治疗提供了框架.
- 这些发现突显了与NALCN相关的神经疾病中功能增益突变的结构基础.
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