Gamma-aminobutyric acid type A receptor alpha-1 beta-2 subtype (GABA-A receptor α1β2)

The Gamma-aminobutyric acid type A (GABA-A) receptor alpha-1 beta-2 subtype is a ligand-gated chloride channel that plays a fundamental role in mediating fast inhibitory neurotransmission in the mammalian central nervous system [1]. It is a member of the Cys-loop receptor superfamily and typically exists as a pentameric assembly; the α1β2 configuration specifically highlights the interface between alpha-1 and beta-2 subunits, which is a key site for various pharmacological agents [2]. Upon activation by the endogenous neurotransmitter GABA, the receptor undergoes a conformational change that opens a central pore, allowing chloride ions to flow into the cell and hyperpolarize the neuronal membrane [3]. This specific subtype is particularly relevant in the context of general anesthesia, as drugs like etomidate and propofol exert their effects by binding to the α/β subunit interfaces [4]. While the α1 subunit is primarily linked to sedation, anticonvulsant activity, and anterograde amnesia, the α1β2 configuration lacks the γ subunit required for classical benzodiazepine sensitivity [5]. Malfunctions or expression changes in these receptor subunits are associated with pathologies such as epilepsy, insomnia, and chronic anxiety [6]. Understanding the specific pharmacology of the α1β2 configuration is essential for developing targeted neurotherapeutics with reduced side-effect profiles [7]. [1] UniProt: P14867, P47870; [2] Sigel & Steinmann (2012) JBC; [3] PubMed: PMID 21910647; [4] PubMed: PMID 15148151; [5] Olsen & Sieghart (2008) Neuropharmacology; [6] NIH: GeneReviews; [7] PubChem: GABA-A Receptor.

Other names

GABAA receptor alpha1beta2α1β2 GABA-A receptorGABA(A) receptor alpha1/beta2GABRA1/GABRB2 receptor

Positive allosteric modulation of chloride ion influx upon GABA binding, leading to neuronal hyperpolarization and reduced excitability.