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
中科院分区:
文献类型:
--
作者:
Mruk K;Kobertz WR
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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影响因子:
56.9
作者:
Baukrowitz, T;Yellen, G
通讯作者:
Yellen, G
影响因子:
56.9
作者:
MACKINNON, R;YELLEN, G
通讯作者:
YELLEN, G
影响因子:
5.3
作者:
Li, Y;Gamper, N;Shapiro, MS
通讯作者:
Shapiro, MS
DOI:
10.1085/jgp.200409114
发表时间:
2004-12
期刊:
The Journal of general physiology
影响因子:
--
作者:
Gage SD;Kobertz WR
通讯作者:
Kobertz WR
影响因子:
64.5
作者:
Kubisch, C;Schroeder, BC;Jentsch, TJ
通讯作者:
Jentsch, TJ