极地T1接口与形状变化有关,这些变化打开了电压关闭的通道
D L Minor1, Y F Lin, B C Mobley
1Howard Hughes Medical Institute and Department of Physiology, University of California, San Francisco 94143, USA. minor@itsa.ucsf.edu
Cell
|September 28, 2000
概括
电压关闭通道 (Kv) 依赖于它们的T1域进行关闭. 极地T1表面的结构变化对于通道开放至关重要,正如突变和域替换实验所证明的那样.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 离子通道功能 离子通道功能
背景情况:
- Kv电压通道对于细胞电信号传输至关重要.
- 已知细胞质T1域参与KV通道组合.
- 以前的研究表明T1在关中的作用,但缺乏直接的结构证据.
研究的目的:
- 调查T1域在KV通道封锁机制中的直接参与.
- 阐明T1在通道形状变化中的作用的结构基础.
主要方法:
- 在Kv1.2 T1域内特定残留物的位点定向突变发生.
- 异构基因突变分析,以评估结构影响与功能变化.
- 域更换实验使用一个四度体卷轴-卷轴.
主要成果:
- 哺乳动物Kv1.2通道的门关键取决于极端接口内的互补T1表面的残留物.
- 这个接口中的同位素突变最小改变了结构,但稳定了封闭通道和T1四度体.
- 将T1域替换为四度环绕式线圈破坏了封闭通道状态的稳定.
结论:
- 埋藏的极地T1表面内的结构重排是KV通道门的组成部分.
- T1域的结构直接影响通道开放所需的构造变化.
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