Sulfonylurea Receptors Type 1 and 2A Randomly Assemble to Form Heteromeric KATP Channels of Mixed Subunit Composition

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Sulfonylurea Receptors Type 1 and 2A Randomly Assemble to Form Heteromeric KATP Channels of Mixed Subunit Composition

ATP-sensitive potassium (K(ATP)) channels play important roles in regulating insulin secretion, controlling vascular tone, and protecting cells against metabolic stresses. K(ATP) channels are heterooctamers of four pore-forming inwardly rectifying (Kir6.2) subunits and four sulfonylurea receptor (SUR) subunits. K(ATP) channels containing SUR1 (e.g. pancreatic) and SUR2A (e.g. cardiac) display d...

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The sensitivity of K(ATP) channels to high-affinity block by sulfonylureas and to stimulation by K(+) channel openers and MgADP (PCOs) is conferred by the regulatory sulfonylurea receptor (SUR) subunit, whereas ATP inhibits the channel through interaction with the inward rectifier (Kir6.2) subunit. Phosphatidylinositol 4, 5-bisphosphate (PIP(2)) profoundly antagonized ATP inhibition of K(ATP) c...

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ژورنال

عنوان ژورنال: Journal of General Physiology

سال: 2007

ISSN: 1540-7748,0022-1295

DOI: 10.1085/jgp.200709894