Gamma-Aminobutyric Acid Type A Receptor Alpha4-Beta3-Gamma Subunit

The gamma-aminobutyric acid type A (GABA_A) receptor is a ligand-gated ion channel and the principal mediator of fast inhibitory neurotransmission in the central nervous system (CNS). The specific target described—alpha4-beta3-gamma subunit—refers to a pentameric assembly typically composed of two α4, two β3, and one γ (usually γ2) subunits. This combination determines the receptor’s localization, pharmacology, and physiological function. When activated by GABA binding, these receptors open their intrinsic chloride ion channel. Chloride influx hyperpolarizes neurons, inhibiting action potential firing. Alterations in expression or function of specific GABA_A receptor assemblies have been implicated in epilepsy, anxiety disorders, sleep disturbances, autism spectrum disorders, among others.

Ligand-gated chloride channel activity; Chloride influx hyperpolarizes neurons, inhibiting action potential firing.