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Science 22 September 1989:
Vol. 245. no. 4924, pp. 1389 - 1392
DOI: 10.1126/science.2551039

Articles

Science, Vol 245, Issue 4924, 1389-1392
Copyright © 1989 by American Association for the Advancement of Science


articles

Type I and type II GABAA-benzodiazepine receptors produced in transfected cells

DB Pritchett, H Luddens, and PH Seeburg

Department of Molecular Neuroendocrinology, Zentrum fur Molekulare Biologie, Universitat Heidelberg, Federal Republic of Germany.

GABAA (gamma-aminobutyric acid A)-benzodiazepine receptors expressed in mammalian cells and assembled from one of three different alpha subunit variants (alpha 1, alpha 2, or alpha 3) in combination with a beta 1 and a gamma 2 subunit display the pharmacological properties of either type I or type II receptor subtypes. These receptors contain high-affinity binding sites for benzodiazepines. However, CL 218 872, 2-oxoquazepam, and methyl beta-carboline-3-carboxylate (beta-CCM) show a temperature-modulated selectivity for alpha 1 subunit-containing receptors. There were no significant differences in the binding of clonazepam, diazepam, Ro 15-1788, or dimethoxy-4-ethyl-beta-carboline-3-carboxylate (DMCM) to all three recombinant receptors. Receptors containing the alpha 3 subunit show greater GABA potentiation of benzodiazepine binding than receptors containing the alpha 1 or alpha 2 subunit, indicating that there are subtypes within the type II class. Thus, diversity in benzodiazepine pharmacology is generated by heterogeneity of the alpha subunit of the GABAA receptor.


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Endogenous Phosphorylation of Distinct [IMAGE]-Aminobutyric Acid Type A Receptor Polypeptides by Ser/Thr and Tyr Kinase Activities Associated with the Purified Receptor.
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M. C. O'Donovan, P. R. Buckland, and P. McGuffin (1992)
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