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Updated: Jul 11, 2025

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TMEM63C的冷-电磁结构表明它可以作为单体起作用

Yuqi Qin¹, Daqi Yu¹, Dan Wu²

¹Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

Nature communications

|November 9, 2023

概括

确定了TMEM63C通道结构,揭示了与相关蛋白质的关键差异. 这一发现促进了对通道功能及其在听力损失等疾病中的作用的理解.

科学领域:

生物物理学的生物物理.
分子生物学分子生物学
结构生物学结构生物学

背景情况:

TMEM63蛋白家族 (A,B,C) 是透通道,由低度激活.
这些通道的缺陷与疾病有关,包括听力损失.
TMEM63蛋白的精确结构和生理作用在很大程度上是未知的.

研究的目的:

为了确定鼠标TMEM63C的冷电子显微镜 (cryo-EM) 结构.
阐明TMEM63C,TMEM63A,TMEM63B和植物OSCA之间的结构差异.
研究特定结构元素和寡合化状态的功能作用.

主要方法:

电子显微镜 (cryo-EM) 用于TMEM63C的结构性确定.
与TMEM63A,TMEM63B和OSCA的结构比较.
局部定向的突变发生和成像测试.

主要成果:

鼠标TMEM63C的冷-EM结构以3.56 Å分辨率确定.
与TMEM63A,TMEM63B和OSCA相比,发现了显著的结构差异.
突变和成像突出了TM0-TM6合对道活性的重要性.
TMEM63C主要以单体的形式存在,而TMEM63B则以单体和二体的混合形式存在.

结论:

该研究提供了TMEM63C的第一个高分辨率结构,为通道机制提供了洞察力.
结构和功能数据揭示了TM0-TM6合在TMEM63通道活动中的关键作用.
寡合化状态 (单质与二质) 似乎是TMEM63家族蛋白质的调节机制.

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