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pubmed-article:9199780pubmed:abstractTextThe pore-forming alpha 1 subunit of L-type calcium (Ca2+) channels is the molecular target of Ca2+ channel blockers such as phenylalkylamines (PAAs). Association and dissociation rates of (-)devapamil were compared for a highly PAA-sensitive L-type Ca2+ channel chimera (Lh) and various class A Ca2+ channel mutants. These mutants carry the high-affinity determinants of the PAA receptor site in a class A sequence environment. Apparent drug association and dissociation rate constants were significantly affected by the sequence environment (class A or L-type) of the PAA receptor site. Single point mutations affecting the high-affinity determinants in segments IVS6 of the PAA receptor site, introduced into a class A environment, reduced the apparent drug association rates. Mutation I1811M in transmembrane segment IVS6 (mutant AL25/-I) had the highest impact and decreased the apparent association rate for (-)devapamil by approximately 30-fold, suggesting that this pore-lining isoleucine in transmembrane segment IVS6 plays a key role in the formation of the PAA receptor site. In contrast, apparent drug dissociation rates of Ca2+ channels in the resting state were almost unaffected by point mutations of the PAA receptor site.lld:pubmed
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pubmed-article:9199780pubmed:articleTitleCalcium channel block by (-)devapamil is affected by the sequence environment and composition of the phenylalkylamine receptor site.lld:pubmed
pubmed-article:9199780pubmed:affiliationInstitut für Biochemische Pharmakologie, Innsbruck, Austria.lld:pubmed
pubmed-article:9199780pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9199780pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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