Benzodiazepine binding site on GABA(A) receptor (BZD binding site)

The benzodiazepine binding site is a specific modulatory site located on the GABA(A) receptor, a major inhibitory neurotransmitter receptor in the central nervous system. This site is distinct from the primary GABA binding sites and plays a crucial role in mediating the pharmacological effects of benzodiazepines and related drugs. It is situated at the interface between an α subunit (usually α1, α2, α3, or α5) and a γ2 subunit within the extracellular domain of the receptor. Benzodiazepines do not activate the channel directly; instead, they act as positive allosteric modulators, enhancing GABA's effect. The pharmacological profile depends on which alpha isoform forms part of the binding pocket, influencing effects such as sedation, anxiolysis, and muscle relaxation.

Other names

Benzodiazepine receptorBDZ receptorGABA(A) receptor benzodiazepine siteBZ binding site

Positive allosteric modulation of GABA(A) receptor, enhancing GABA's effect by increasing its affinity or efficacy at opening the chloride channel, resulting in greater neuronal inhibition through hyperpolarization.