Discovery of a novel activator of KCNQ1-KCNE1 K channel complexes.

Discovery of a novel activator of KCNQ1-KCNE1 K channel complexes.
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DOI:
10.1371/journal.pone.0004236
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Kobertz WR
Kobertz WR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mruk K;Kobertz WR

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KCNQ 1电压门控K+通道(Kv7.1)与五种KCNE肽家族结合形成具有不同门控特性和药理学敏感性的复合物。不同的KCNQ 1-KCNE复合物的不同门控特性使得相同的K+通道能够在可兴奋和不可兴奋组织中起作用。小分子激活剂将是解剖KCNQ 1-KCNE复合物的门控机制的有价值的工具;然而,已知的KCNQ 1通道激活剂很少,并且大多数对生理相关的KCNQ 1-KCNE复合物无效。在这里,我们表明,一个简单的硼酸,苯硼酸(PBA),激活KCNQ 1/KCNE 1复合物共表达在非洲爪蟾卵母细胞在毫摩尔浓度。PBA使KCNQ 1通道复合物的电压敏感性向有利于负电位下的开放状态移动。不同大小的电荷载体的分析表明,PBA也针对KCNQ 1通道的渗透途径。硼酸部分的激活对Kv 7家族成员(KCNQ 1、KCNQ 2/3和KCNQ 4)具有一定的特异性,因为PBA不会激活Shaker或hERG通道。此外,许多PBA衍生物的商业可用性提供了一大类化合物来研究KCNQ 1-KCNE复合物的门控机制。
KCNQ1 voltage-gated K+ channels (Kv7.1) associate with the family of five KCNE peptides to form complexes with diverse gating properties and pharmacological sensitivities. The varied gating properties of the different KCNQ1-KCNE complexes enables the same K+ channel to function in both excitable and non excitable tissues. Small molecule activators would be valuable tools for dissecting the gating mechanisms of KCNQ1-KCNE complexes; however, there are very few known activators of KCNQ1 channels and most are ineffective on the physiologically relevant KCNQ1-KCNE complexes. Here we show that a simple boronic acid, phenylboronic acid (PBA), activates KCNQ1/KCNE1 complexes co-expressed in Xenopus oocytes at millimolar concentrations. PBA shifts the voltage sensitivity of KCNQ1 channel complexes to favor the open state at negative potentials. Analysis of different-sized charge carriers revealed that PBA also targets the permeation pathway of KCNQ1 channels. Activation by the boronic acid moiety has some specificity for the Kv7 family members (KCNQ1, KCNQ2/3, and KCNQ4) since PBA does not activate Shaker or hERG channels. Furthermore, the commercial availability of numerous PBA derivatives provides a large class of compounds to investigate the gating mechanisms of KCNQ1-KCNE complexes.
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