Domain:The segment S4 is probably the voltage-sensor and is characterized by a series of positively charged amino acids at every third position. ,Domain:The tail may be important in modulation of channel activity and/or targeting of the channel to specific subcellular compartments. ,Function:This protein mediates the voltage-dependent potassium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane , the protein forms a potassium-selective channel through which potassium ions may pass in accordance with their electrochemical gradient. ,PTM:Phosphorylation of serine residues in the inactivation gate inhibits rapid channel closure. ,similarity:Belongs to the potassium channel family. C (Shaw) subfamily. ,subunit:Homotetramer (Probable) . Heterotetramer of potassium channel proteins. ,
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