Gating Properties Conferred on Bk Channels by the β3b Auxiliary Subunit in the Absence of Its Nh2- and Cooh Termini


Both beta1 and beta2 auxiliary subunits of the BK-type K(+) channel family profoundly regulate the apparent Ca(2)+ sensitivity of BK-type Ca(2)+-activated K(+) channels. Each produces a pronounced leftward shift in the voltage of half-activation (V(0.5)) at a given Ca(2)+ concentration, particularly at Ca(2)+ above 1 microM. In contrast, the rapidly… (More)

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