FUNCTION: Potassium channel activated by both membrane depolarization or increase in cytosolic Ca(2+) that mediates export of K(+) (PubMed:29330545, PubMed:31152168). It is also activated by the concentration of cytosolic Mg(2+). Its activation dampens the excitatory events that elevate the cytosoli...
FUNCTION: Potassium channel activated by both membrane depolarization or increase in cytosolic Ca(2+) that mediates export of K(+) (PubMed:29330545, PubMed:31152168). It is also activated by the concentration of cytosolic Mg(2+). Its activation dampens the excitatory events that elevate the cytosolic Ca(2+) concentration and/or depolarize the cell membrane. It therefore contributes to repolarization of the membrane potential. Plays a key role in controlling excitability in a number of systems, such as regulation of the contraction of smooth muscle, the tuning of hair cells in the cochlea, regulation of transmitter release, and innate immunity. In smooth muscles, its activation by high level of Ca(2+), caused by ryanodine receptors in the sarcoplasmic reticulum, regulates the membrane potential. In cochlea cells, its number and kinetic properties partly determine the characteristic frequency of each hair cell and thereby helps to establish a tonotopic map. Kinetics of KCNMA1 channels are determined by alternative splicing, phosphorylation status and its combination with modulating beta subunits. Highly sensitive to both iberiotoxin (IbTx) and charybdotoxin (CTX). {ECO:0000269|PubMed:29330545, ECO:0000269|PubMed:31152168}.
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GO - Biological processes (BP):
cellular potassium ion homeostasis [GO:0030007]; micturition [GO:0060073]; negative regulation of cell volume [GO:0045794]; positive regulation of apoptotic process [GO:0043065]; potassium ion transport [GO:0006813]; regulation of ion transmembrane transport [GO:0034765]; regulation of membrane pote...
cellular potassium ion homeostasis [GO:0030007]; micturition [GO:0060073]; negative regulation of cell volume [GO:0045794]; positive regulation of apoptotic process [GO:0043065]; potassium ion transport [GO:0006813]; regulation of ion transmembrane transport [GO:0034765]; regulation of membrane potential [GO:0042391]; relaxation of vascular associated smooth muscle [GO:0060087]; response to calcium ion [GO:0051592]; response to carbon monoxide [GO:0034465]; response to hypoxia [GO:0001666]; response to osmotic stress [GO:0006970]; smooth muscle contraction involved in micturition [GO:0060083]
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GO - Molecular function (MF):
actin binding [GO:0003779]; calcium-activated potassium channel activity [GO:0015269]; identical protein binding [GO:0042802]; large conductance calcium-activated potassium channel activity [GO:0060072]; metal ion binding [GO:0046872]; voltage-gated potassium channel activity [GO:0005249]...
actin binding [GO:0003779]; calcium-activated potassium channel activity [GO:0015269]; identical protein binding [GO:0042802]; large conductance calcium-activated potassium channel activity [GO:0060072]; metal ion binding [GO:0046872]; voltage-gated potassium channel activity [GO:0005249]
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GO - Cellular component (CC):
apical plasma membrane [GO:0016324]; caveola [GO:0005901]; integral component of membrane [GO:0016021]; plasma membrane [GO:0005886]; postsynaptic membrane [GO:0045211]; voltage-gated potassium channel complex [GO:0008076]...
apical plasma membrane [GO:0016324]; caveola [GO:0005901]; integral component of membrane [GO:0016021]; plasma membrane [GO:0005886]; postsynaptic membrane [GO:0045211]; voltage-gated potassium channel complex [GO:0008076]
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