Mitochondrial ATP-sensitive potassium channel and plasma membrane ATP-sensitive potassium channel (K_ATP channel (the term is applied to both mitochondrial and plasma membrane forms, with mitoK_ATP for the mitochondrial type and pmK_ATP for the plasma membrane type)[3][8][7])

The ATP-sensitive potassium channels (K_ATP channels) are **octameric ion channels** comprised of inward-rectifying potassium channel (Kir6.x) subunits and regulatory sulfonylurea receptor (SURx) subunits, which link the state of cellular metabolism to membrane potential or mitochondrial homeostasis[8][1][3]. - **Plasma membrane K_ATP channels** (e.g., Kir6.2/SUR1 in pancreatic β-cells) regulate excitability in response to metabolic cues, playing an essential role in insulin secretion, cardiovascular tone, and neuronal/glial excitability[8][4]. - **Mitochondrial K_ATP channels** (mitoK_ATP), recently defined by the pore-forming CCDC51 (MITOK) and regulatory MITOSUR subunits, control mitochondrial potassium influx, contributing to the maintenance of mitochondrial volume, energy production, and protection against ischemic or metabolic stress[3][5][1]. Both channel types are important therapeutic targets, with modulators impacting diseases ranging from diabetes and cardiovascular disorders to migraines and pulmonary hypertension[8][4][2]. If more specific annotation is needed for either mitochondrial or plasma membrane K_ATP channel, these should be documented as distinct targets due to their partially distinct molecular identity, localization, pharmacology, and disease relevance.

Other names

Mitochondrial K_ATP channel (mitoK_ATP)Plasma membrane K_ATP channel (pmK_ATP)ATP-sensitive potassium channelK_ATP channelKir6.x/SURx complexATP-regulated potassium channelKir6.1/SUR1, Kir6.2/SUR1, Kir6.1/SUR2A or SUR2B (for plasma membrane subtypes)MITOK (for mitoK_ATP pore subunit)[3]

Channel blockers (e.g., sulfonylureas) inhibit K_ATP, promoting depolarization and stimulating insulin release in pancreatic β-cells[8]. Channel openers (e.g., diazoxide, levcromakalim) increase K^+ efflux, hyperpolarize membrane, and decrease cellular excitability or provide cardioprotection during stress[1][3][4]. Selective modulation of Kir6.x or SUR subunits underlies specificity for tissue and therapeutic indication[6][8]. For mitoK_ATP, channel opening helps regulate matrix volume and protect against ischemic injury through effects on mitochondrial homeostasis[3][7].