KCNIP4

This gene encodes a member of the family of voltage-gated potassium (Kv) channel-interacting proteins (KCNIPs), which belong to the recoverin branch of the EF-hand superfamily. Members of the KCNIP family are small calcium binding proteins. They all have EF-hand-like domains, and differ from each other in the N-terminus. They are integral subunit components of native Kv4 channel complexes. They may regulate A-type currents, and hence neuronal excitability, in response to changes in intracellular calcium. This protein member also interacts with presenilin. Multiple alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

Potassium Voltage-Gated Channel Interacting Protein 4

Regulatory subunit of Kv4/D (Shal)-type voltage-gated rapidly inactivating A-type potassium channels. Modulates KCND2 channel density, inactivation kinetics and rate of recovery from inactivation in a calcium-dependent and isoform-specific manner (PubMed:11847232, PubMed:18957440, PubMed:23576435).
Modulates KCND3/Kv4.3 currents (PubMed:23576435).
Isoform 4 does not increase KCND2 expression at the cell membrane (PubMed:18957440).
Isoform 4 retains KCND3 in the endoplasmic reticulum and negatively regulates its expression at the cell membrane.

Protein localization to plasma membraneISS:UniProtKB
Regulation of potassium ion transmembrane transportISS:UniProtKB

Cell membrane; Cytoplasm
Isoform 4: Endoplasmic reticulum