XB-ART-36553
J Biol Chem
2007 Jun 15;28224:17720-8. doi: 10.1074/jbc.M607063200.
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Interaction sites between the Slo1 pore and the NH2 terminus of the beta2 subunit, probed with a three-residue sensor.
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Calcium- and voltage-gated (BK) K(+) channels encoded by Slo1 play an essential role in nervous systems. Although it shares many common features with voltage-dependent K(V) channels, the BK channel exhibits differences in gating and inactivation. Using a mutant in which FWI replaces three residues (FIW) in the NH(2) terminus of wild-type beta2-subunits, in conjunction with alanine-scanning mutagenesis of the Slo1 S6 segment, we identify that the NH(2) terminus of beta2-subunits interacts with the residues near the cytosolic superficial mouth of BK channels during inactivation. The cytosolic blockers did not share the sites with NH(2) terminus of beta2-subunits. A novel blocking-inactivating scheme was proposed to account for the observed non-competition inactivation. Our results also suggest that the residue Ile-323 plays a dual role in interacting with the NH(2) terminus of beta2-subunits and modulating the gating of BK channels.
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Species referenced: Xenopus laevis
Genes referenced: kcnma1