Maxi Potassium channel alpha Products

Description

Function: Potassium channel activated by both membrane depolarization or increase in cytosolic Ca(2+) that mediates export of K(+). 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). The protein was initially thought to contain two functionally distinct parts: The core channel (from the N-terminus to the S9 segment) that mediates the channel activity, and the cytoplasmic tail (from the S9 segment to the C-terminus) that mediates the calcium sensing. The situation is however more complex, since the core channel also contains binding sites for Ca(2+) and Mg(2+).; Defects in KCNMA1 are the cause of generalized epilepsy and paroxysmal dyskinesia (GEPD). Epilepsy is one of the most common and debilitating neurological disorders. Paroxysmal dyskinesias are neurological disorders characterized by sudden, unpredictable, disabling attacks of involuntary movement often requiring life-long treatment. The coexistence of epilepsy and paroxysmal dyskinesia in the same individual or family is an increasingly recognized phenomenon. Patients manifest absence seizures, generalized tonic-clonic seizures, paroxysmal nonkinesigenic dyskinesia, involuntary dystonic or choreiform movements. Onset is usually in childhood and patients may have seizures only, dyskinesia only, or both.; Enzyme regulation: Ethanol and carbon monoxide-bound heme increase channel activation. Heme inhibits channel activation.; Subcellular location: Membrane, Multi-pass membrane protein.; Tissue specificity: Widely expressed. Except in myocytes, it is almost ubiquitously expressed.

Bioinformatics

Entrez	16531 Mouse 3778 Human 83731 Rat
Uniprot	NM_002247 Human NP_001014797.1 Human Q08460 Mouse Q12791 Human Q62976 Rat
Product By Gene ID	3778
Alternate Names	bA205K10.1 BK channel BKCA alpha subunit BKCA alpha BKTM calcium-activated potassium channel subunit alpha-1 DKFZp686K1437 hSlo K(VCA)alpha k(VCA)alpha KCNMA Maxi K channel MaxiK MGC71881 potassium large conductance calcium-activated channel, subfamily M, alphamember 1 SAKCA Slo homolog Slo1 SLO1 Slo-alpha SLO-ALPHA Slowpoke homolog stretch-activated Kca channel subfamily M subunit alpha-1

Research Areas for Maxi Potassium channel alpha

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Potassium Channels