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Regulatory subunit of the calcium activated potassium KCNMA1 (maxiK) channel. Modulates the calcium sensitivity and gating kinetics of KCNMA1, thereby contributing to KCNMA1 channel diversity. Increases the apparent Ca2+/voltage sensitivity of the KCNMA1 channel. It also modifies KCNMA1 channel kinetics and alters its pharmacological properties. It slows down the activation and the deactivation kinetics of the channel. Acts as a negative regulator of smooth muscle contraction by enhancing the calcium sensitivity to KCNMA1. Its presence is also a requirement for internal binding of the KCNMA1 channel opener dehydrosoyasaponin I (DHS-1) triterpene glycoside and for external binding of the agonist hormone 17-beta-estradiol (E2). Increases the binding activity of charybdotoxin (CTX) toxin to KCNMA1 peptide blocker by increasing the CTX association rate and decreasing the dissociation rate.
Gene Name: | potassium large conductance calcium-activated channel, subfamily M, beta member 1 |
Family/Subfamily: | Ion Channel , Potassium channel - calcium-activated |
Synonyms: | KCNMB1, BK beta, BK channel beta subunit, BK channel subunit beta-1, BKbeta1, Hslo-beta, K(VCA)beta, Maxi K channel beta subunit, Maxi K beta, Hbeta1, SLO-BETA, Slo-beta-1, BKbeta, K(VCA)beta-1, Maxi K channel subunit beta-1 |
Target Sequences: | NM_004137 NP_004128.1 Q16558 |
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