Mitochondrial K + Transport: Modulation and Functional Consequences.

The existence of a K ⁺ cycle in mitochondria has been predicted since the development of the chemiosmotic theory and has been shown to be crucial for several cellular phenomena, including regulation of mitochondrial volume and redox state. One of the pathways known to participate in K ⁺ cycling is the ATP-sensitive K ⁺ channel, MitoK _ATP . This channel was vastly studied for promoting protection against ischemia reperfusion when pharmacologically activated, although its molecular identity remained unknown for decades. The recent molecular characterization of MitoK _ATP has opened new possibilities for modulation of this channel as a mechanism to control cellular processes. Here, we discuss different strategies to control MitoK _ATP activity and consider how these could be used as tools to regulate metabolism and cellular events.