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重组人的GABAA受体复合物A21 148异亮氨酸突变为缬氨酸),(151天冬氨酸突变为天冬酰胺和149苏氨酸突变为谷氨酰胺)β2γ2s的药理学特征

王秀坤   

  1. 北京中医药大学, 北京 100029
  • 收稿日期:2000-03-04 修回日期:2000-11-27 出版日期:2001-03-15 发布日期:2001-03-15

Characterization of the Pharmacology of Recombinant Human GABAA Receptor Complexes Containing A2(α1 isoleucin 148 to valine) or A2(α1 asparatic acid 151 to asparagin) ……

Wang Xiukun   

  1. Beijing University of Traditional Chinese Medicine, 100029
  • Received:2000-03-04 Revised:2000-11-27 Online:2001-03-15 Published:2001-03-15

摘要: 为了研究重组人的GABAA受体复合物A2β2γ2s (A2亚基是α1亚基148氨基酸由异亮氨酸突变为缬氨酸)的药理学特征, 阐明哪一个氨基酸是影响受体亲和性的关键, 通过定向位点突变, 我们构建了A2亚基151天冬氨酸突变为天冬酰胺和A2亚基149苏氨酸突变为谷氨酰胺, 并通过baculovirus病毒-Sf-9昆虫表达系统重组了A2亚基151天冬氨酸突变为天冬酰胺和A2亚基149苏氨酸突变为谷氨酰胺与β2, γ2s 亚基的GABAA 受体复合物, 测定了6GABAA受体GABA位点活性化合物。发现拮抗剂pitrazepine亲和力下降了约10, 本研究结果表明, 149151位氨基酸很有可能是影响pitrazepine对含有α1亚基的GABAA 受体复合物亲和性、药效的关键。

关键词: 重组人的GABAA受体, 药理学, α1亚基, 突变, Pitrazepine

Abstract: Recombinant human GABAA receptors were investigated in vitro by coexpression of cDNAs coding for α1, β2 and γ2 subunits in the baculovirus/Sf-9 insect cell system. A single amino acid exchange α1 (asparatic acid 151 to asparagin or α1 (threonine 149 to glutamine) in the N-terminal, extracellular part of the α1 subunit induced about 10 fold decrease in an antagonist pitrazepine affinity. Other GABAA receptor ligands had little difference in their affinity. It was likely that 151 and 149 amino acid residues were essential for the binding affinity and efficacy of pitrazepine to GABAA receptor combinations containing an α1 subunit.

Key words: Recombinant human GABAA receptor, α1 subunit, Mutation, Pitrazepine

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