华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (11): 115-119.

• 生物工程 • 上一篇    下一篇

枯草忏菌纤溶酶基因的克隆及表达

罗文华 郭勇韩双艳   

  1. 华南理工大学 生物科学与工程学院,广东 广州 510640
  • 收稿日期:2006-07-21 出版日期:2007-11-25 发布日期:2007-11-25
  • 通信作者: 郭勇,教授, E-mail: btyguo@ scut. edu. cn E-mail:wenhualuo@126.com
  • 作者简介:罗文华(1975-) ,男,博士生,主要从事酶工程与生物制药研究.
  • 基金资助:

    广东省自然科学基金博士启动基金资助项目(05300230)

Cloning and Expression of Douchi Fibrinolytic Enzyme (DFE) Gene from Bacillus subtilis

Luo Wen-hua  Guo Yong  Han Shuang-yan   

  1. School of Biological Science and Engineering, South China Univ. of Technology , Guangzhou 510640 , Guangdong , China
  • Received:2006-07-21 Online:2007-11-25 Published:2007-11-25
  • Contact: 郭勇,教授, E-mail: btyguo@ scut. edu. cn E-mail:wenhualuo@126.com
  • About author:罗文华(1975-) ,男,博士生,主要从事酶工程与生物制药研究.
  • Supported by:

    广东省自然科学基金博士启动基金资助项目(05300230)

摘要: 为了提高豆政纤溶酶(DFE) 的表达产量,采用PCR 方法从高纤溶活性的枯草芽孢杆菌DC12 的基因组中扩增获得DFE 基因,将含有启动子至3' 非翻译区的全长1400bp基因插入大肠杆菌-枯草杆菌穿梭载体pBE3 ,构建了DFE 基因的表达质粒,化学转化枯草杆菌WB800 获得了DFE 的重组表达菌.试验结果表明:DFE 基因在自身启动子驱动下,在蛋白酶缺陷型的枯草杆菌中获得了高活性的分址表达;重组表达菌株培养30h 后,培养物上清液中的纤溶酶活性最高可达690U/mL.

关键词: 豆政纤溶酶, 枯草杆菌, 基因克隆, 表达

Abstract:

In order to improve the yield of Douchi fibrinolytic enzyme (DFE) , the full DFE gene encoding was amplified and cloned from the chromosome of Bacillus s叫tilis (B. subtilis) DC12 by means of PCR. The full DFE gene including the promoter, the encoding sequence and the 3'UTR was then inserted into the Escherichia coli-B. subtilis shuttle vector pBE3 and chemically transformed into B. subtilis WB800 to construct the recombinant expression strain. The results show that DFE gene is successfully expressed under the driving of its own promoter in B.subtilis WB800 and secreted into the medium , and that , after the cultivation of recombinant strain for 30 h , the activity of fibrinolytic enzyme in the supematant is as high as 690U/mL.

Key words: Douchi fibrinolytic enzyme, Bacillus subtilis, gene cloning, expression