Cross talk between activation and slow inactivation gates of Shaker potassium channels.

Cross talk between activation and slow inactivation gates of Shaker potassium channels.
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DOI:
10.1085/jgp.200609644
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发表时间:
2006-11
期刊:
The Journal of general physiology
影响因子:
--
通讯作者:
Deutsch C
Deutsch C
中科院分区:
其他
文献类型:
--
作者:
Panyi G;Deutsch C

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这项研究解决了 Shaker 钾通道的激活和缓慢失活门之间的能量耦合。为了跟踪非传导失活通道中激活门的状态,我们使用了两种功能测定:工程化到孔腔内衬蛋白质 (V474C) 中的半胱氨酸残基的可及性,以及通过捕获在关闭的激活门后面的 Cs+ 离子去极化而释放。我们确定激活门移动的速率取决于失活门的状态。关闭的失活门有利于更快地打开和更慢地关闭激活门。我们还表明,超极化在通道从失活中恢复之前很久就关闭了激活门。由于激活和缓慢失活是钾通道中普遍存在的门控过程,因此它们之间的串扰可能是控制跨膜离子通量的基本因素。
This study addresses the energetic coupling between the activation and slow inactivation gates of Shaker potassium channels. To track the status of the activation gate in inactivated channels that are nonconducting, we used two functional assays: the accessibility of a cysteine residue engineered into the protein lining the pore cavity (V474C) and the liberation by depolarization of a Cs+ ion trapped behind the closed activation gate. We determined that the rate of activation gate movement depends on the state of the inactivation gate. A closed inactivation gate favors faster opening and slower closing of the activation gate. We also show that hyperpolarization closes the activation gate long before a channel recovers from inactivation. Because activation and slow inactivation are ubiquitous gating processes in potassium channels, the cross talk between them is likely to be a fundamental factor in controlling ion flux across membranes.
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