Voltage-gated potassium (Kv) channels are key components of the potassium currents in the heart and central nervous system. In the heart, Kv4 channels are involved in the repolarization phase of the action potential. In the brain however, these channels prevent reverse-propagation of action potentials. Found associated with Kv4 channels are a group of calcium-binding proteins termed KChIPs (Kv channel interacting proteins). KChIPs are small molecular weight proteins that bind to the cytoplasmic amino termini of Kv4 alpha-subunits and help to modulate its function.
There are currently three known KChIPs; KChIP 1 expressed in the brain; KChIP 2 expressed in the brain, heart, and lung, and has three isoforms, a, b, and c; and KChIP 3, also known as calsenilin and DREAM (downstream regulatory elements (DRE)-antagonist modulator) which is expressed in the brain and testis.
By Western blot, this antibody detects ~33 and 26 kDa proteins representing KChIP2b and c, respectively, from rat ventricular myocyte whole cell lysate.
Regulatory subunit of Kv4/D (Shal)-type voltage-gated rapidly inactivating A-type potassium channels. Modulates channel density, inactivation kinetics and rate of recovery from inactivation in a calcium-dependent and isoform-specific manner. In vitro, modulates KCND2/Kv4.2 and KCND3/Kv4.3 currents. Involved in KCND2 and KCND3 trafficking to the cell surface. May be required for the expression of I(To) currents in the heart.
Expressed in brain. Colocalizes with KCND2 in excitatory neurons including cortical and hippocampal CA1 pyramidal cells. Isoform 3 is expressed in heart and in umbilical vein endothelial cells. Not expressed in fetal heart.
Belongs to the recoverin family. Contains 4 EF-hand domains.
Palmitoylated. Palmitoylation enhances association with the plasma membrane.
Cell membrane and Cell membrane. Detected on lipid rafts (By similarity).