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- W2422826377 abstract "ATP-sensitive K(+)-channels of plasma membranes belong to the inward rectifier potassium channels type. They are involved in coupling of electrical activity of muscle cell with its metabolic state. These channels are heterooctameric and consist of two types of subunits: four poreforming (Kir 6.x) and four regulatory (SUR, sulfonylurea receptor). The Kir subunits contain highly selective K+ filter and provide for high-velocity K+ currents. The SUR subunits contain binding sites for activators and blockers and have metabolic sensor, which enables channel activation under conditions of metabolic stress. ATP blocks K+ currents through the ATP-sensitive K(+)-channels in the most types of muscle cells. However, functional activity of these channels does not depend on absolute concentration of ATP but on the ATP/ADP ratio and presence of Mg2+. Physiologically active substances, such as phosphatidylinositol bisphosphate and fatty acid esters can regulate the activity of these structures in muscle cells. Activation of these channels under ischemic conditions underlies their cytoprotective action, which results in prevention of Ca2+ overload in cytosol. In contrast to ATP-sensitive K(+)-channels of plasma membranes, the data regarding the structure and function of ATP-sensitive K(+)-channels of mitochondrial membrane are contradictory. Pore-forming subunits of this channel have not been firmly identified yet. ATP-sensitive K+ transport through the mitochondrial membrane is easily tested by different methods, which are briefly reviewed in this paper. Interaction of mitoK(ATP) with physiological and pharmacological ligands is discussed as well." @default.
- W2422826377 created "2016-06-24" @default.
- W2422826377 creator A5072481986 @default.
- W2422826377 date "2014-06-27" @default.
- W2422826377 modified "2023-10-18" @default.
- W2422826377 title "ATP-sensitive K(+)-channels in muscle cells: features and physiological role" @default.
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- W2422826377 doi "https://doi.org/10.15407/ubj86.03.005" @default.
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