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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A point mutation in the γ_2 subunit of γ-aminobutyric acid type A receptors results in altered benzodiazepine binding site specificity
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A point mutation in the γ_2 subunit of γ-aminobutyric acid type A receptors results in altered benzodiazepine binding site specificity

机译:γ-氨基丁酸A型受体的γ_2亚基中的点突变导致苯二氮卓结合位点特异性改变

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摘要

Benzodiazepines allosterically modulate γ- aminobutyric acid (GABA) evoked chloride currents of γ- aminobutyric acid type A (GABAA) receptors. Coexpression of either rat γ_2 or γ_3, in combination with α1 and β2 subunits, results both in receptors displaying high [~3H]Ro 15-1788 affinity. However, receptors containing a γ_3 subunit display a 178-fold reduced affinity to zolpidem as compared with γ_2- containing receptors. Eight chimeras between γ_2 and γ_3 were constructed followed by nine different point mutations in γ_2, each to the homologous amino acid residue found in γ_3. Chimeric or mutantγ subunits were coexpressed with α_1 and β_2 in human embryonic kidney 293 cells to localize amino acid residues responsible for the reduced zolpidem affinity.
机译:苯二氮卓类药物会变构地调节γ-氨基丁酸(GABAA)受体引起的γ-氨基丁酸(GABA)诱发的氯离子电流。大鼠γ_2或γ_3与α1和β2亚基的共表达会导致受体均显示高[〜3H] Ro 15-1788亲和力。然而,与含有γ_2的受体相比,含有γ_3亚基的受体对唑吡坦的亲和力降低了178倍。构建了γ_2和γ_3之间的八个嵌合体,随后在γ_2中存在九个不同的点突变,每个突变都与在γ_3中发现的同源氨基酸残基相同。嵌合或突变的γ亚基在人胚胎肾293细胞中与α_1和β_2共表达,以定位造成唑吡坦亲和力降低的氨基酸残基。

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