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Updated: Jul 13, 2026

Using an α-Bungarotoxin Binding Site Tag to Study GABA A Receptor Membrane Localization and Trafficking
Published on: March 28, 2014
In Search of GABAA Receptor's Neurosteroid Binding Sites
Lautaro D Alvarez1,2, Adali Pecci1,3, Dario A Estrin4,5
1Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria , Buenos Aires C1428EGA , Argentina.
Abstract:
Neurosteroids (NS) are the main modulators of γ-aminobutyric acid type A receptors (GABAARs), which are the ligand-gated channels target of the major inhibitory neurotransmitter in vertebrates. As a consequence of their ability to modify inhibitory functions in the brain, NS have high physiological and clinical relevance. Accumulated evidence has strongly suggested that NS binding sites were located in the GABAAR transmembrane domain; however the specific localization of these sites has remained an enigma for decades. Fortunately, recent resolution of GABAARs crystal structures, together with computational strategies applied to investigate the NS binding, has paved the way to rationalizing the molecular basis of NS modulation. This work reviews from a historical perspective the road followed for establishing the GABAAR/NS binding mode, from their initial molecular modeling to the latest findings. Furthermore, a comparative analysis describing the NS binding is provided, plus a preliminary analysis of putative NS sites in other assemblies.
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