UNIPROT #

P22460

PROTEIN NAME

KCNA5

SYNONYMS

ATFB7 antibody; cardiac potassium channel antibody; HCK1 antibody; HK2 antibody; HPCN1 antibody; insulinoma and islet potassium channel antibody; KCNA5 antibody; KCNA5_HUMAN antibody; KV1.5 antibody; PCN1 antibody; potassium channel 1 antibody; Potassium channel, insulinoma and islet cell antibody; Potassium channel, voltage-gated, shaker-related subfamily, member 5 antibody; Potassium voltage gated channel subfamily A member 5 antibody; Potassium voltage-gated channel subfamily A member 5 antibody; Voltage-gated potassium channel HK2 antibody; voltage-gated potassium channel protein Kv1.5 antibody; Voltage-gated potassium channel subunit Kv1.5 antibody

SEQUENCE SIMILARITIES

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

TISSUE SPECIFICITY

Pancreatic islets and insulinoma.

POST-TRANSLATIONAL MODIFICATION

Sumoylated on Lys-221, and Lys-536, preferentially with SUMO3. Sumoylation regulates the voltage sensitivity of the channel.

SUBCELLULAR LOCATION

Plasma membrane.

FUNCTION

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. 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. Channel properties are modulated by cytoplasmic beta subunits that regulate the subcellular location of the alpha subunits and promote rapid inactivation. Homotetrameric channels display rapid activation and slow inactivation. May play a role in regulating the secretion of insulin in normal pancreatic islets. Isoform 2 exhibits a voltage-dependent recovery from inactivation and an excessive cumulative inactivation.