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• W2049276472 abstract "Various GABAA receptor subunits share four highly homologous putative transmembrane domains (M1 to M4) and have been proposed to form an ion channel of pentameric structure with M2 lining the pore. The carboxyl terminal side of M2 contains three amino acid residues containing a hydroxyl group, which are Thr 265, 266 and serine 268 in the alpha 6 subunit. In order to study their functional role, we generated mutants of the alpha 6 subunit carrying a single point mutation of threonine 265 or 266 to alanine, or serine 268 to glycine. Co-expression of the mutants with beta 2 and gamma 2 subunits in human embryonic kidney cells produced functional receptors which are similar to the wild type in their sensitivity to a benzodiazepine agonist (U-92330), insensitivity to Zn, anion permeability, and GABA dose-response profiles as monitored with the whole cell patch clamp technique. Only in the alpha 6T266A beta 2 gamma 2 subtype, however, GABA-induced Cl- currents decayed much more rapidly than the wild type (about 10 times faster). Analysis of the GABA dependency of desensitization indicates that the T266A mutation enhanced the desensitization rate with little effect on the recovery rate from desensitization or on the half-maximal GABA concentration. We conclude that threonine 266 in the alpha 6 subunit plays a pivotal role in desensitization processes of GABAA receptors." @default.
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• W2049276472 date "1995-02-01" @default.
• W2049276472 modified "2023-10-13" @default.
• W2049276472 title "Acceleration of GABA-dependent desensitization by mutating threonine 266 to alanine of the α6 subunit of rat GABAA receptors" @default.
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• W2049276472 doi "https://doi.org/10.1016/0304-3940(95)11293-6" @default.
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