Crystal structure of a human GABA(A) receptor

Article

关键词: NICOTINIC ACETYLCHOLINE-RECEPTORS;    SIZE-EXCLUSION CHROMATOGRAPHY;    LIGAND-BINDING DOMAIN;    X-RAY-STRUCTURE;    EXTRACELLULAR DOMAIN;    ALPHA-BUNGAROTOXIN;    ION SELECTIVITY;    CHANNEL;    MUTATION;    EXPRESSION;   

DOI  :  10.1038/nature13293

来源: SCIE

【 摘 要 】

Type-A gamma-aminobutyric acid receptors (GABA(A)Rs) are the principal mediators of rapid inhibitory synaptic transmission in the human brain. A decline in GABA(A)R signalling triggers hyperactive neurological disorders such as insomnia, anxiety and epilepsy. Here we present the first three-dimensional structure of a GABA(A)R, the human beta 3homopentamer, at 3 angstrom resolution. This structure reveals architectural elements unique to eukaryotic Cys-loop receptors, explains the mechanistic consequences of multiple human disease mutations and shows an unexpected structural role for a conserved N-linked glycan. The receptor was crystallized bound to a previously unknown agonist, benzamidine, opening a new avenue for the rational design of GABA(A)R modulators. The channel region forms a closed gate at the base of the pore, representative of a desensitized state. These results offer new insights into the signalling mechanisms of pentameric ligand-gated ion channels and enhance current understanding of GABAergic neurotransmission.

【 授权许可】

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