Voltage-gated potassium channel protein (VGKC)

Voltage-gated potassium channel proteins (VGKCs) are membrane-spanning ion channels selective for potassium ions and activated by changes in the cell’s membrane potential[1][3][6][7]. Structurally, they are tetramers composed of four α-subunits, each with six transmembrane segments (S1–S6), including a voltage sensor (mainly in S4) and a selectivity filter that permits K+ passage while excluding smaller ions such as Na+[1][4][6]. VGKCs play a central role in repolarizing the cell membrane after action potentials in excitable tissues, regulating neuronal firing, cardiac rhythm, and muscle contraction[1][3][4]. Mutations or functional disruptions of these channels are implicated in disorders affecting the nervous system (such as epilepsy and encephalopathy) and the cardiovascular system (including arrhythmias and periodic paralysis)[3][7]. VGKCs are a clinically validated drug target for antiarrhythmic, anticonvulsant, and neuromodulatory agents; however, pharmacological modulation carries a risk of adverse effects such as cardiac arrhythmias, neurotoxicity, and muscle weakness[3][7].

Other names

Voltage-gated potassium channel (single or plural)VGK channelKv channelPotassium voltage-gated channel

Blockade of potassium currents to prolong action potential (antiarrhythmics) - Inhibition of neuronal repolarization (anticonvulsants, neurotoxins) - Openers/enhancers to promote potassium efflux and reduce neuronal firing - Modulation of channel gating or selectivity