Probing the cavity of the slow inactivated conformation of shaker potassium channels.

Probing the cavity of the slow inactivated conformation of shaker potassium channels.
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DOI:
10.1085/jgp.200709758
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发表时间:
2007-05
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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缓慢失活涉及电压门控钾通道外口的局部重排,但对激活门和选择性过滤器之间的空腔重排一无所知。我们现在报告说,空穴在缓慢失活状态下经历了构象变化。这种变化表现为面对水腔的残基的可及性改变,以及四乙基铵对其内部结合部位的亲和力显著降低。这些发现对缓慢失活过程中通道的整体变化以及激活和缓慢失活门之间可能的耦合有一定的意义。
Slow inactivation involves a local rearrangement of the outer mouth of voltage-gated potassium channels, but nothing is known regarding rearrangements in the cavity between the activation gate and the selectivity filter. We now report that the cavity undergoes a conformational change in the slow-inactivated state. This change is manifest as altered accessibility of residues facing the aqueous cavity and as a marked decrease in the affinity of tetraethylammonium for its internal binding site. These findings have implications for global alterations of the channel during slow inactivation and putative coupling between activation and slow-inactivation gates.
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