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Identification and Rescue of Congenital Hyperinsulinism-Associated ABCC8 Mutations that Impair KATP Channel Trafficking
Abstract ATP-sensitive potassium (KATP) channels composed of Kir6.2 and sulfonylurea receptor 1 (SUR1) couple glucose metabolism with insulin secretion in pancreatic β-cells and are vital to glucose homeostasis. Loss-of-function mutations in SUR1 and Kir6.2, encoded by ABCC8 and KCNJ11, respectively are the commonest causes of severe persistent hypoglycemia in infants and children seen in the rare disease congenital hyperinsulinism (HI).
Structure of an open KATP channel reveals tandem PIP2 binding sites mediating the Kir6.2 and SUR1 regulatory interface
Abstract ATP-sensitive potassium (KATP) channels, composed of four pore-lining Kir6.2 subunits and four regulatory sulfonylurea receptor 1 (SUR1) subunits, control insulin secretion in pancreatic β-cells. KATP channel opening is stimulated by PIP2 and inhibited by ATP. Mutations that increase channel opening by PIP2 reduce ATP inhibition and cause neonatal diabetes.
Structure of an open KATP channel reveals tandem PIP2 binding sites mediating the Kir6.2 and SUR1 regulatory interface
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