Separation of heteromeric potassium channel Kcv towards probing subunit composition-regulated ion permeation and gating.

Separation of heteromeric potassium channel Kcv towards probing subunit composition-regulated ion permeation and gating.
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DOI:
10.1016/j.febslet.2010.03.023
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发表时间:
2010-04-16
期刊:
影响因子:
3.5
通讯作者:
Gu LQ
Gu LQ
中科院分区:
生物学3区
文献类型:
--
作者:
Tan Q;Shim JW;Gu LQ

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该病毒编码的Kcv可以在脂质膜中形成同源四聚体钾通道。这种微型肽可以在体外合成,并且从SDS聚丙烯酰胺凝胶纯化的四聚体保留了K+通道功能。将这种能力与质量标记方法相结合,我们提出了一种简单,直接的方法,可以通用地操纵四聚体中的单个亚基,从而能够检测单个亚基对通道功能的贡献。使用这种方法,我们表明,从选择性过滤器中只有一个亚基的结构变化足以导致永久性通道失活(“全或无”机制),而细胞外入口附近的突变添加修改的离子渗透与突变亚基的数量在四聚体(“添加剂”机制)。
The chlorella virus-encoded Kcv can form a homo-tetrameric potassium channel in lipid membranes. This miniature peptide can be synthesized in vitro, and the tetramer purified from the SDS polyacrylamide gel retains the K+ channel functionality. Combining this capability with the mass-tagging method, we propose a simple, straightforward approach that can generically manipulate individual subunits in the tetramer, thereby enabling the detection of contribution from individual subunits to the channel functions. Using this approach, we showed that the structural change from only one subunit in the selectivity filter is sufficient to cause permanent channel inactivation (“all-or-none” mechanism), whereas the mutation near the extracellular entrance additively modifies the ion permeation with the number of mutant subunits in the tetramer (“additive” mechanism).
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