J4

• 基础研究 • 上一篇    下一篇

p21waf1基因的克隆及在大肠杆菌中的高效表达

姜艳芳1,谭 岩1,赵平伟2,刘力华1,方艳秋1,许淑芬1   

  1. 1. 吉林大学第一医院中心实验室,吉林 长春130021;2. 吉林大学第四医院肝胆外科,吉林 长春130011
  • 收稿日期:2004-05-31 修回日期:1900-01-01 出版日期:2005-03-28 发布日期:2005-03-28

Cloning of p21waf1 gene and its high expression in E.coli JM109

JIANG Yan-fang1, TAN Yan1, ZHAO Ping-wei2, LIU Li-hua1, FANG Yan-qiu1, Xu Shu-fen1   

  1. 1. Department of Central Laboratory, First Hospital, Jilin University, Changchun130021, China;2 Department of Hepatobiliary Surgery, Fourth Hospital,Jilin University, Changchun 130011, China
  • Received:2004-05-31 Revised:1900-01-01 Online:2005-03-28 Published:2005-03-28

摘要: 目的:构建人p21waf1基因的原核表达载体并在大肠杆菌JM109中高效表达。方法:从人肝细胞中分离总RNA,经逆转录多聚酶链反应(RT-PCR)得到p21waf1全基因。用原核细胞表达载体构建了pBV220/p21waf1重组质粒,经DNA测序确认后,将其转化到大肠杆菌JM109进行表达、初步纯化。 结果:SDS-PAGE凝胶电泳分离显示在分子量21 000处有一诱导蛋白带,薄层扫描显示表达产物在诱导5 h时可达细菌总蛋白的38%,Western blotting证明表达产物与抗人P21waf1单克隆抗体有特异性免疫反应。 结论:成功构建出p21waf1表达载体,诱导产生蛋白经检测证实为P21waf1蛋白。

关键词: 克隆, 分子, 基因表达

Abstract: Objective To construct the pronucleus expression vector of human p21waf1and express it in E.coli strain of JM109. Methods The total RNA was isolated from human hepatocytes, and p21waf1 was cloned by RT-PCR, the PCR product was ligated with PGEM-T vector and sequenced. Then the target sequence was inserted into an temperature-sensitive expression vector pBV220 and expressed in E.coli JM109.The recombinant protein was identified by immunoblot. Results DNA sequencing confirmed that the sequence of cloned p21waf1 was identical to the published sequence. The recombinant plasmid pBV220/p21waf1 was transformed into E.coli JM109 and over- expressed during 42℃ induction. After induction for 5 h, the expression products showed a high expression level of recombinant protein with 21 000, and was more than 38% of the total bacterial protein. Western blotting analysis indicated that the the recombinant protein could react specifically with anti-P21waf1 antibody. Conclusion The p21waf1 expression vector is constructed successfully, and the induced-protein is confirmed as P21waf1 protein by detection.

Key words: cloning, molecular, gene expression

中图分类号: 

  • Q78