Gamma-aminobutyric acid type A receptor alpha-1 beta-2 gamma-2 (GABAA receptor α1β2γ2) (GABAA receptor α1β2γ2)

The Gamma-aminobutyric acid type A receptor alpha-1 beta-2 gamma-2 (GABAA receptor α1β2γ2) is the most abundant isoform of the ionotropic GABA receptor in the mammalian brain [UniProt P14867, P47870, P18507]. It is a pentameric protein complex that functions as a ligand-gated chloride channel, primarily responsible for mediating fast inhibitory neurotransmission in the central nervous system [IUPHAR/BPS Guide to Pharmacology]. The benzodiazepine binding site is a distinct allosteric pocket located at the interface of the α1 and γ2 subunits [Sigel & Steinmann, 2012]. When occupied by agonists like benzodiazepines, the receptor's affinity for GABA increases, leading to enhanced chloride influx and neuronal hyperpolarization [StatPearls: Benzodiazepines]. This specific α1-containing subtype is particularly associated with the sedative, hypnotic, and anticonvulsant effects of these drugs [PubMed: PMC3324001]. Consequently, it serves as a critical therapeutic target for treating insomnia, anxiety, and status epilepticus. However, chronic modulation of this receptor can lead to significant safety concerns, including tolerance, dependence, and cognitive side effects [StatPearls: Benzodiazepines].

Other names

α1β2γ2 GABAA receptorBenzodiazepine receptorGABA(A) receptor alpha-1 beta-2 gamma-2GABRA1/GABRB2/GABRG2 complex

Positive allosteric modulation of the GABA-induced chloride current. Drugs bind to the benzodiazepine site at the α1/γ2 subunit interface, increasing the frequency of channel opening when GABA is present [StatPearls: Benzodiazepines, Sigel & Steinmann 2012].