Delayed rectifier voltage-gated potassium channel (Kv channel) (Kv channel)

Delayed rectifier voltage-gated potassium channels are a diverse class of transmembrane proteins that open in response to membrane depolarization to allow the efflux of potassium ions, thereby facilitating the repolarization phase of action potentials in excitable cells like neurons and myocytes [1]. These channels are critical for maintaining the resting membrane potential and controlling the frequency and duration of electrical impulses [2]. In the heart, specific subtypes like the rapid (IKr) and slow (IKs) components are essential for cardiac rhythm; mutations or drug-induced inhibition of these channels, particularly the hERG channel (Kv11.1), can lead to Long QT Syndrome and life-threatening arrhythmias [3]. In the nervous system, they regulate neurotransmitter release and neuronal firing patterns, making them therapeutic targets for conditions such as epilepsy and multiple sclerosis [4]. Pharmacological modulation includes blockers used as antiarrhythmics and activators used as anticonvulsants, though off-target inhibition remains a primary safety concern in drug development [5].

Other names

Voltage-gated potassium channelDelayed rectifier K+ channelIK channelVoltage-dependent potassium channelKCNH2KCNQ1KCNB1KCNC1

Drugs targeting these channels primarily function by blocking the pore to delay repolarization and extend the refractory period in cardiac tissue, or by acting as positive allosteric modulators to enhance potassium efflux and reduce neuronal hyperexcitability.