FEATURES

FAMILY

DESCRIPTION

Also known as KCMB4_HUMAN, KCNMB4. 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. Decreases the gating kinetics and calcium sensitivity of the KCNMA1 channel, but with fast deactivation kinetics. May decrease KCNMA1 channel openings at low calcium concentrations but increases channel openings at high calcium concentrations. Makes KCNMA1 channel resistant to 100 nM charybdotoxin (CTX) toxin concentrations. Interacts with KCNMA1 tetramer (PubMed:10692449, PubMed:10804197). There are probably 4 molecules of KCMNB4 per KCNMA1 tetramer (PubMed:10692449, PubMed:10804197). Interacts with FMR1 (via N-terminus) (PubMed:25561520).

EXTERNAL LINKS

KCNMB4

Calcium-activated potassium channel subunit beta-4

KCNMB4

Molecular Synopsis