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pubmed-article:9774106pubmed:abstractTextThe slow afterhyperpolarization that follows an action potential is generated by the activation of small-conductance calcium-activated potassium channels (SK channels). The slow afterhyperpolarization limits the firing frequency of repetitive action potentials (spike-frequency adaptation) and is essential for normal neurotransmission. SK channels are voltage-independent and activated by submicromolar concentrations of intracellular calcium. They are high-affinity calcium sensors that transduce fluctuations in intracellular calcium concentrations into changes in membrane potential. Here we study the mechanism of calcium gating and find that SK channels are not gated by calcium binding directly to the channel alpha-subunits. Instead, the functional SK channels are heteromeric complexes with calmodulin, which is constitutively associated with the alpha-subunits in a calcium-independent manner. Our data support a model in which calcium gating of SK channels is mediated by binding of calcium to calmodulin and subsequent conformational alterations in the channel protein.lld:pubmed
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pubmed-article:9774106pubmed:articleTitleMechanism of calcium gating in small-conductance calcium-activated potassium channels.lld:pubmed
pubmed-article:9774106pubmed:affiliationVollum Institute, Oregon Health Sciences University, Portland 97201, USA.lld:pubmed
pubmed-article:9774106pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9774106pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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