inward rectifying potassium channel KCNJ11-SUR complex inward rectifying K+ channel GO:0008282 Kir6.2-SUR complex A protein complex that comprises four pore-forming (Kir6.x) and four regulatory sulphonylurea receptor (SURx) subunits and forms a transmembrane channel through which ions may pass. The opening and closing of the channel is regulated by ATP: binding of ATP to the Kir6.x subunit inhibits channel activity, whereas binding of Mg2+-complexed ATP or ADP to the SURx subunit stimulates channel activity. Kir6.1-SUR complex KCNJ8-SUR complex Kir6.1-SURx complex ATP-sensitive potassium channel complex KCNJ11-SURx complex KCNJ8-SURx complex Kir6.x-SURx complex Kir6.2-SURx complex cellular_component Kir6-SUR complex Kir6.x complex potassium channel complex plasma membrane protein complex