Gamma-aminobutyric acid type A receptor alpha-2 subunit-containing benzodiazepine site (α2-GABA_A receptor)

The GABA_A receptor benzodiazepine site on α2βxγ2-containing receptors is a specific pharmacological target within the central nervous system responsible for mediating anxiolytic and muscle-relaxant effects (Rudolph & Knoflach, 2011, Nature Reviews Drug Discovery). These receptors are pentameric ligand-gated chloride channels typically composed of two alpha-2 subunits, two beta subunits, and one gamma-2 subunit (Sigel & Steinmann, 2012, Journal of Biological Chemistry). The benzodiazepine binding site is located at the extracellular interface between the α2 and γ2 subunits (Möhler, 2012, Advances in Pharmacology). Activation of this site by positive allosteric modulators (PAMs) enhances the inhibitory effect of the neurotransmitter gamma-aminobutyric acid (GABA), leading to hyperpolarization of the postsynaptic neuron (Olsen, 2018, Pharmacology & Therapeutics). Unlike α1-containing receptors which primarily mediate sedation and amnesia, α2-containing receptors are highly expressed in the limbic system and are key targets for treating anxiety without significant sedative side effects (Engin et al., 2012, Trends in Pharmacological Sciences). Research into subtype-selective ligands, such as darigabat, aims to develop anxiolytics that lack the abuse potential and cognitive impairment associated with traditional non-selective benzodiazepines (Gieringer et al., 2024, Neuropsychopharmacology).

Other names

GABRA2-containing GABA_A receptorAlpha-2 subunit-containing GABA_A receptorBenzodiazepine receptor alpha-2 subtypeα2βγ2 GABA_A receptor

Positive allosteric modulation of GABA-induced chloride currents at the α2-γ2 subunit interface.