Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes. Forms tetrameric potassium-selective channels through which potassium ions pass in accordance with their electrochemical gradient. The channel alternates between opened and closed conformations in response to the voltage difference across the membrane (PubMed:7556635). Can form functional homotetrameric channels and heterotetrameric channels that contain variable proportions of KCNA1, KCNA2, KCNA4, KCNA5, and possibly other family members as well; channel properties depend on the type of alpha subunits that are part of the channel (By similarity). Channel properties are modulated by cytoplasmic beta subunits that regulate the subcellular location of the alpha subunits and promote rapid inactivation (PubMed:7556635). Homotetrameric channels display rapid activation and slow inactivation (PubMed:7556635). May play a role in regulating the secretion of insulin in normal pancreatic islets (By similarity).

Belongs to the potassium channel family. A (Shaker) (TC 1.A.1.2) subfamily. Kv1.5/KCNA5 sub-subfamily.

598 amino acids

MEIALGPLENGGAMTIRGGGEETAGCSQAAPTAGLGDGSQEPAPRGRGCSARRGAEPGERPLPPQPPELPQSRRSPLEEEEGEGDPGLSVAEEQTLGAGALHHQRVLINISGLRFETQLGTLAQFPNTLLGDPAKRLRYFDPLRNEYFFDRNRPSFDGILYYYQSGGRLRRPVNVSLDVFADEIRFYQLGDEAMERFREDEGFIKDEEKPLPRNEFQRQVWLIFEYPESSGSARAIAIVSVLVILISIITFCLETLPEFKDERELLRHPPVPHQPPAAPALGANGSGAVAPASGSTVAPLLPRTLADPFFIVETTCVIWFTFELLVRFFACPSKAEFSRNIMNIIDIVAIFPYFITLGTELAEQQPGGGGGGQNGQQAMSLAILRVIRLVRVFRIFKLSRHSKGLQILGKTLQASMRELGLLIFFLFIGVILFSSAVYFAEADNQGTHFSSIPDAFWWAVVTMTTVGYGDMRPITVGGKIVGSLCAIAGVLTIALPVPVIVSNFNYFYHRETDHEEQAALKEEPGSQSRGTSLDAGGQRKASWSKASLCKAGGSLETADSVRRGSCLLEKYNLKAKSNVDLRRSLYALCLDTSRETDL

65.5 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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