Potassium Channel Subunit Alpha (KCa)

Potassium channel subunit alpha refers to the primary pore-forming subunit of potassium (K+) channels, which are integral membrane proteins that facilitate the selective transport of potassium ions across cell membranes. These channels are crucial for numerous physiological processes including neuronal signaling, cardiac function, and cellular homeostasis. They form tetrameric structures to create a functional ion-conducting pore and are classified into several families based on their gating mechanisms and structure, including voltage-gated (Kv), calcium-activated (BK), inward rectifier (Kir), and two-pore domain (K2P) channels. Dysfunction of potassium channels is implicated in a variety of diseases, making them important drug targets.

Other names

K+ channel alpha subunitVoltage-gated potassium channel alpha subunitCalcium-activated potassium channel alpha subunitInward rectifier potassium channel alpha subunitTwo-pore domain potassium channel alpha subunitKv alpha subunitKir alpha subunitK2P alpha subunit

Ion channel blockade, channel modulation (activation or inhibition)