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一个震动器K +通道与一个微型工程电压传感器
Yanping Xu1, Yajamana Ramu, Zhe Lu
1Department of Physiology, Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, PA 19104, USA.
Cell
|August 10, 2010
概括
离子通道中的电压感应模具有足够的最小核心,用于电压封闭. 图案的较大部分调节了这个功能,揭示了通道关门机制的关键见解.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 神经科学是一个神经科学.
背景情况:
- 电压离子通道对于细胞电信号传输至关重要.
- 这些通道具有电压感应域 (VSD),可以检测膜电位的变化.
- 这种VSD的特点是具有涉及S3b和S4跨膜段的形图案.
研究的目的:
- 为了研究电压门所需的VSD动图的基本组成部分.
- 确定特定残留物的作用及其在S3b和 (NT) S4.4中的互补性.
- 为了确定赋予电压门能力的最小结构要求.
主要方法:
- 用位点定向的突变发生法来删除S3b和 (NT) S4段的残留三重体.
- 进行了电生理学记录,以评估突变通道的电压调节能力.
- 作为一个模型系统,使用了Shaker K(+) 频道.
主要成果:
- 在S3b和 (NT) S4中单独或组合删除残留三胞胎并没有取消基本电压门.
- 在Shaker K(+) 通道中的Paddle图案 (43个残留物) 的很大一部分可以在不损失电压门的情况下被一个甘氨酸三重组所取代.
- 电压感应氨酸之间的疏水残留物影响通道状态之间的平衡.
结论:
- 动图包含一个最小的核心,对于在生理范围内的电压关至关重要.
- 一个更大的,模块化部分的动图微调道门.
- 这项研究完善了我们对电压离子通道结构功能关系的理解.
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