Journal
NEUROCHEMISTRY INTERNATIONAL
Volume 50, Issue 1, Pages 61-68Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuint.2006.07.004
Keywords
GABA-A receptors; ionophore; channel chemoconvulsants; binding sites; point mutagenesis
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Funding
- Intramural NIH HHS [NIH0012391104] Funding Source: Medline
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Gamma-aminobutyric acid (GABA) type A receptors play a key role in brain inhibitory neurotransmission, and are ligand-activated chloride channels blocked by numerous convulsant ligands. Here we summarize data on binding of picrotoxin, tetrazoles, beta-lactams, bicyclophosphates, butyrolactones and neurotoxic pesticides to GABA-A ionophore, and discuss functional and structural overlapping of their binding sites. The paper reviews data on convulsants' binding sensitivity to different point mutations in ionophore-lining second trans-membrane domains of GABA-A subunits, and maps possible location of convulsants' sites within the chloride ionophore. We also discuss data on inhibition of glycine, glutamate, serotonin (5-HT3) and N-acetylcholine receptors by GABA-A channel blockers, and examine the applicability of this model to other homologous ionotropic receptors. Positioning various convulsant-binding sites within ionophore of GABA-A receptors, this model enables a better understanding of complex architectonics of ionotropic receptors, and may be used for developing new channel-modulating drugs. Published by Elsevier Ltd.
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