Properties of cloned ATP-sensitive K+ currents expressed in Xenopus oocytes.
1. We have studied the electrophysiological properties of cloned ATP-sensitive K+ channels (KATP channels) heterologously expressed in Xenopus oocytes. This channel comprises a sulphonylurea receptor subunit (SUR) and an inwardly rectifying K+ channel subunit (Kir). 2. Oocytes injected with SUR1 and either Kir6.2 or Kir6.1 exhibited large inwardly rectifying K+ currents when cytosolic ATP levels were lowered by the metabolic inhibitors azide or FCCP. No currents were observed in response to a...Expand abstract
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