Potassium voltage-gated channel subfamily G member 3 (KCNG3)

Potassium voltage-gated channel subfamily G member 3 (KCNG3, Kv6.3) is a regulatory “electrically silent” subunit of the voltage-gated potassium channel family. It does not form functional channels on its own but coassembles with functional pore-forming subunits (such as KCNB1/Kv2.1) to modulate the kinetics of potassium currents in excitable cells. KCNG3 is expressed in both neuronal and non-neuronal tissues and contributes to the fine-tuning of excitability, action potential repolarization, and related physiological functions. Altered expression of KCNG3 has been implicated in several disease contexts, including neuropsychiatric disorders, cardiovascular pathologies, and certain cancers. There are currently no drugs or approved selective modulators targeting KCNG3 directly, but its regulatory effects on channel function underline its relevance as a molecular target in pathophysiological processes.

Other names

KCNG3Kv6.3Potassium channel, voltage-gated, modifier subfamily G, member 3

KCNG3 acts as a regulatory (gamma) subunit and modifies the gating, inactivation, and deactivation kinetics of heterotetrameric Kv channels containing functional alpha subunits (such as Kv2.1). It does not form functional channels alone, but in combination with other Kv subunits, alters ion flux and cell excitability.