KCNMB2

MaxiK channels are large conductance, voltage and calcium-sensitive potassium channels which are fundamental to the control of smooth muscle tone and neuronal excitability. MaxiK channels can be formed by 2 subunits: the pore-forming alpha subunit and the modulatory beta subunit. The protein encoded by this gene is an auxiliary beta subunit which decreases the activation time of MaxiK alpha subunit currents. Alternative splicing results in multiple transcript variants of this gene. Additional variants are discussed in the literature, but their full length nature has not been described. [provided by RefSeq, Jul 2013]

Full Name

Potassium Calcium-Activated Channel Subfamily M Regulatory Beta Subunit 2

Function

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. Acts as a negative regulator that confers rapid and complete inactivation of KCNMA1 channel complex. May participate in KCNMA1 inactivation in chromaffin cells of the adrenal gland or in hippocampal CA1 neurons.

Biological Process

Action potentialManual Assertion Based On ExperimentIDA:UniProtKB
Detection of calcium ionManual Assertion Based On ExperimentIDA:UniProtKB
Neuronal action potentialManual Assertion Based On ExperimentIDA:UniProtKB
Potassium ion transportManual Assertion Based On ExperimentIDA:UniProtKB
Regulation of vasoconstrictionManual Assertion Based On ExperimentTAS:UniProtKB

Cellular Location

Membrane

Topology

Cytoplasmic: 1-46
Helical: 47-67
Extracellular: 68-194
Helical: 195-215
Cytoplasmic: 216-235

PTM

N-glycosylated.