KCNK1 Antibody

KCNK1; HOHO1; KCNO1; TWIK1; Potassium channel subfamily K member 1; Inward rectifying potassium channel protein TWIK-1; Potassium channel K2P1; Potassium channel KCNO1

KCNK1, also known as TWIK-1, is an ion channel that plays a crucial role in passive transmembrane potassium transport and the regulation of resting membrane potential in various tissues, including brain astrocytes, kidney, and others. It forms dimeric channels that allow potassium ions to pass through in accordance with their electrochemical gradient. Under physiological potassium concentrations and neutral pH, the channel exhibits selectivity for K+ ions. However, it becomes permeable to Na+ at subphysiological K+ levels and upon acidification of the extracellular medium. Homodimeric channels, when expressed in heterologous systems, display very low potassium channel activity and can function as weakly inward rectifying potassium channels. Channel activity is modulated by activation of serotonin receptors. Heterodimeric channels containing KCNK1 and KCNK2 exhibit significantly higher activity and may represent the predominant form in astrocytes. Heterodimeric channels containing KCNK1 and KCNK3 or KCNK9 also demonstrate significantly higher activity. Heterodimeric channels formed by KCNK1 and KCNK9 might contribute to halothane-sensitive currents. KCNK1 mediates outward rectifying potassium currents in dentate gyrus granule cells and contributes to the regulation of their resting membrane potential. It also contributes to the regulation of action potential firing in dentate gyrus granule cells and down-regulates their intrinsic excitability. In astrocytes, the heterodimer formed by KCNK1 and KCNK2 is essential for rapid glutamate release in response to activation of G-protein coupled receptors, such as F2R and CNR1. KCNK1 is required for normal ion and water transport in the kidney. It contributes to the regulation of the resting membrane potential of pancreatic beta cells. The low channel activity of homodimeric KCNK1 may be attributed to sumoylation. Additionally, the low channel activity may be due to rapid internalization from the cell membrane and retention in recycling endosomes.