Structural highlights
Disease
[GBRB3_HUMAN] Autism;Childhood absence epilepsy. Disease susceptibility is associated with variations affecting the gene represented in this entry.
Function
[GBRB3_HUMAN] GABA, the major inhibitory neurotransmitter in the vertebrate brain, mediates neuronal inhibition by binding to the GABA/benzodiazepine receptor and opening an integral chloride channel.
Publication Abstract from PubMed
Type-A gamma-aminobutyric acid receptors (GABAARs) are the principal mediators of rapid inhibitory synaptic transmission in the human brain. A decline in GABAAR signalling triggers hyperactive neurological disorders such as insomnia, anxiety and epilepsy. Here we present the first three-dimensional structure of a GABAAR, the human beta3 homopentamer, at 3 A 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 GABAAR 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.
Crystal structure of a human GABA receptor.,Miller PS, Aricescu AR Nature. 2014 Jun 8. doi: 10.1038/nature13293. PMID:24909990[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Miller PS, Aricescu AR. Crystal structure of a human GABA receptor. Nature. 2014 Jun 8. doi: 10.1038/nature13293. PMID:24909990 doi:http://dx.doi.org/10.1038/nature13293
