食品科学 ›› 2011, Vol. 32 ›› Issue (7 ): 211-215.doi: 10.7506/spkx1002-6630-201107045

• 生物工程 • 上一篇    下一篇

大肠杆菌中表达Cry1C基因及其重组表达产物的纯化及复性

曹思硕1,许文涛1,2,冉文君1,梁立兴1,贺晓云2,罗云波1,元延芳2,黄昆仑1,2,*   

  1. 1.中国农业大学食品科学与营养工程学院 2.农业部转基因生物食用安全监督检验测试中心(北京)
  • 收稿日期:2010-06-03 修回日期:2011-02-25 出版日期:2011-04-15 发布日期:2011-03-30
  • 通讯作者: 许文涛 E-mail:xuwentao1111@sina.com
  • 基金资助:
    农业部转基因生物重大专项(2008ZX08011-005;2009ZX08011-001B)

Expression in E. coli, Purification and Refolding of Recombinant Cry1C Gene from Bacillus thuringiensis

CAO Si-shuo1,XU Wen-tao1,2,RAN Wen-jun1,LIANG Li-xing1,HE Xiao-yun2,LUO Yun-bo1, YUAN Yan-fang2,HUANG Kun-lun1,2,   

  1. 1.College of Food Science and Nutrition Engineering,China Agricultural University,Beijing 100083,China; 2.Supervision,Inspection and Testing Center of Genetically Modified Food Safety,Ministry of Agriculture,Beijing 100083,China
  • Received:2010-06-03 Revised:2011-02-25 Online:2011-04-15 Published:2011-03-30
  • Contact: XU Wen-TAO E-mail:xuwentao1111@sina.com

摘要: 通过PCR方法将苏云金芽孢杆菌Cry1C基因从原始质粒中克隆出来。由于Cry1C基因携带了大量大肠杆菌稀有密码子,因此用PCR方法对其前86个密码子进行修改,以提高其在大肠杆菌BL21(DE3)中的表达量。Cry1C蛋白在大肠杆菌BL21(DE3)中以包涵体形式大量表达,将包涵体用8mol/L尿素溶解并用His TrapTM FF凝胶柱纯化。所得纯化蛋白在复性缓冲液中复性折叠,最终得到可溶并有生物活性(由三化螟活性实验验证)的蛋白。Cry1C蛋白纯度可达99.2%。

关键词: 纯化, 复性折叠, Cry1C蛋白, 稀有密码子, 包涵体, 抗虫基因, 表达

Abstract: The Cry1C gene from Bacillus thuringiensis (Bt) was cloned by polymerase chain reaction (PCR). Due to a large number of E. coli low-usage codons in the gene, the first 86 bases were optimized by PCR to improve the expression in E. coli. Cry1C protein was highly expressed in E. coli BL21 as inclusion bodies, which can be dissolved in 8 mol/L urea and purified by His TrapTM FF crude column under denaturing conditions. The purified Cry1C protein was dialyzed against the refolding buffer to obtain a soluble and biologically active protein. Finally, the protein was determined to be 99.2% purity.

Key words: Cry1C protein, rare codon, inclusion body, expression, purification, refolding

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