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- W1657090468 abstract "The pharmacological significance and structural basis of the gamma-aminobutyrate (GABAA) receptor heterogeneity was investigated in situ by an immunobiochemical analysis of receptor populations characterized by the delta- and alpha 5-subunit. Using an antiserum specific for the delta-subunit, a population of GABAA receptors (21 +/- 2% of solubilized receptors) was immunoprecipitated from rat brain extracts which contained high affinity benzodiazepine binding sites. They were distinguished from those immunoprecipitated by the alpha 1- and alpha 3-subunit antisera by a 4-5-fold and 5-10-fold higher affinity for diazepam and beta CCM, respectively. Using the delta-antiserum in immunoaffinity chromatography the delta-subunit was found to be associated with the alpha 1-, alpha 3-, beta 2/3-, and gamma 2-subunits, suggesting that the latter conveys benzodiazepine receptor sensitivity also to GABAA receptors containing the delta-subunit. The receptor population immunoprecipitated by the alpha 5-subunit antiserum (10 +/- 2% of receptors solubilized from whole brain extracts) was characterized by affinities for zolpidem, beta CCM, and CL 218872 which distinguished it from all other known receptor populations. The alpha 5-subunit was associated with the alpha 1-, alpha 3-, beta 2/3- and gamma 2-subunits pointing to differential subunit combinations. Indeed, when receptor populations were immunoprecipitated by the alpha 5-subunit antiserum from different brain regions, zolpidem displayed striking differences in affinity pointing to the role of subunits other than alpha 5 in determining receptor affinity." @default.
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- W1657090468 date "1993-03-01" @default.
- W1657090468 modified "2023-10-18" @default.
- W1657090468 title "GABAA receptor populations with novel subunit combinations and drug binding profiles identified in brain by alpha 5- and delta-subunit-specific immunopurification." @default.
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- W1657090468 doi "https://doi.org/10.1016/s0021-9258(18)53413-x" @default.
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