遗传 ›› 2010, Vol. 32 ›› Issue (11): 1187-1194.doi: 10.3724/SP.J.1005.2010.01187

• 研究报告 • 上一篇    下一篇

中国红豆杉细胞色素P450还原酶的基因克隆、表达与活性分析

阮仁余1, 2, 孔建强1, 郑晓东1, 张书香1, 秦咸蕴1, 程克棣1, 王建明2, 王伟1   

  1. 1. 中国医学科学院北京协和医学院药物研究所, 卫生部天然药物生物合成重点实验室, 中草药物质基础与资源利用教育部重点实验室, 北京 100050; 2. 黑龙江中医药大学中医药研究院, 哈尔滨 150040
  • 收稿日期:2010-03-31 修回日期:2010-06-18 出版日期:2010-11-20 发布日期:2010-11-25
  • 通讯作者: 王伟 E-mail:wwang@imm.ac.cn
  • 基金资助:

    国家自然科学基金项目(编号:30772677)和北京市自然科学基金项目(编号:5072038)资助

cDNA cloning, heterologous overexpression and activity analysis of cytochrome P450 reductase of Taxus Chinensis

RUAN Ren-Yu1, 2, KONG Jian-Qiang1, ZHENG Xiao-Dong1, ZHANG Shu-Xiang1, QIN Xian-Yun1, CHENG Ke-Di1, WANG Jian-Ming2, WANG Wei1   

  1. 1. Key Laboratory of Biosynthesis of Natural Products, Ministry of Health of PRC, Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education of PRC, Institute of Materia Medica, chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; 2. Academy of Traditional Chinese Medicine, Heilongjiang University of Chinese Medicine, Harbin 150040, China
  • Received:2010-03-31 Revised:2010-06-18 Online:2010-11-20 Published:2010-11-25
  • Contact: WANG Wei E-mail:wwang@imm.ac.cn

摘要: 细胞色素P450还原酶(Cytochrome P450 reductase, CPR)是细胞色素P450羟基化酶电子传递链的组成部分, 在生物体内起着重要的电子传递作用。文章从中国红豆杉(Taxus wallichiana var. Chinensis)愈伤组织细胞中克隆CPR基因(TchCPR), TchCPR含有一个2 154 bp碱基的阅读框, 编码717个氨基酸残基; 在氨基酸水平上它与裸子植物细胞色素P450还原酶的同源性(>82%)高于其他被子植物的细胞色素P450还原酶(<74%)。在大肠杆菌BL21(DE3)中诱导表达了全长和从N-端截短不同数目氨基酸残基的6个融合肽段, 经亲和层析纯化, 分析了表达的不同长度融合蛋白的电子传递效率。结果表明截短长度大于61个氨基酸残基肽段的胞色素P450还原酶都能够诱导表达, 在表达水平上无显著差异, 而截短61个氨基酸的CPR融合蛋白电子传递的催化活性(1.6057 nmol Cyt Cred/min/?g TchCPR融合蛋白)高于其他4个融合蛋白。

关键词: 中国红豆杉, 细胞色素P450还原酶, 诱导表达

Abstract: NADPH-cytochrome P450 reductase (CPR), a partner for P450 monooxygenases, serves as the electron donor to almost all eukaryotic cytochrome P450s. One cDNA (TchCPR) encoding cytochrome P450 reductase of T. chinensis was isolated from callus cells. The cDNA contains an open reading frame of 2 154 nucleotides which encodes a protein of 717 amino acid residues. The TchCPR has higher similarity to other CPRs of gumnosperms (>82%) than that of angiosperms (<74%). The recombinant full-length TchCPR and a series of N-terminal truncated constructs with N-terminal fusion of His Tag were obtained and induced to express in E. coli Bl21(DE3), and then purified using affinity chromatography. The truncated forms of N-terminal more than 61 amino acid residues could be efficiently expressed while the truncated mutant of N-terminal 48 amino acid residues and the wild-type TchCPR were not successfully expressed in E. coli cells. The activity of the truncated TchCPR was assayed by measuring the reduction of cytochrome C. The electron transfer activity of the recombinantly purified CPRT61 was 1.6057 nmol of cytochrome C reduced per min per ?g TchCPR reductase, and it is higher than that of the other four truncated forms.

Key words: T. chinensis, cytochrome P450 reductase, induced expression