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pubmed-article:20584905pubmed:abstractTextKv7 channels, especially Kv7.2 (KCNQ2) and Kv7.3 (KCNQ3), are key determinants for membrane excitability in the brain. Some chemical modulators of KCNQ channels are in development for use as anti-epileptic drugs, such as retigabine (D-23129, N-(2-amino-4-(4-fluorobenzylamino)-phenyl)), which was recently approved for clinical use. In addition, several other compounds were also reported to potentiate activity of the Kv7 channels. It is therefore of interest to investigate compound-channel interactions, so that more insights may be gained to aid future development of therapeutics. We have conducted a screen of 20,000 compounds for KCNQ2 potentiators using rubidium flux combined with atomic absorption spectrometry. Here, we report the characterization of a series of new structures that display isoform specificity and induce a marked reduction of deactivation distinct from that of retigabine. Furthermore, KCNQ2(W236L), a previously reported mutation that abolishes sensitivity to retigabine, remains fully sensitive to these compounds. This result, together with mutagenesis and other studies, suggests that the reported compounds confer a unique mode of action and involve new molecular determinants on the channel protein, consistent with the idea of recognizing a new site on channel protein.lld:pubmed
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pubmed-article:20584905pubmed:authorpubmed-author:VighB JBJlld:pubmed
pubmed-article:20584905pubmed:authorpubmed-author:KoçLLlld:pubmed
pubmed-article:20584905pubmed:authorpubmed-author:WuMengMlld:pubmed
pubmed-article:20584905pubmed:authorpubmed-author:SunHaiyanHlld:pubmed
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pubmed-article:20584905pubmed:authorpubmed-author:ZuLiansuoLlld:pubmed
pubmed-article:20584905pubmed:authorpubmed-author:ZhangYinanYlld:pubmed
pubmed-article:20584905pubmed:authorpubmed-author:GaoZhaobingZlld:pubmed
pubmed-article:20584905pubmed:authorpubmed-author:ZhangTangzhiTlld:pubmed
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pubmed-article:20584905pubmed:dateRevised2011-9-13lld:pubmed
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pubmed-article:20584905pubmed:articleTitleIsoform-specific prolongation of Kv7 (KCNQ) potassium channel opening mediated by new molecular determinants for drug-channel interactions.lld:pubmed
pubmed-article:20584905pubmed:affiliationDepartment of Neuroscience, High Throughput Biology Center, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, USA.lld:pubmed
pubmed-article:20584905pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20584905pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:20584905pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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