›› 2014, Vol. 26 ›› Issue (2): 0-393397.

• 植物保护 •    

新型抗菌蛋白内溶素在大肠杆菌中的融合表达与纯化

李佳1,2,刘伟3, 王华4, 严成其2,王欣3,*,陈剑平2   

  1. 1浙江师范大学 化学与生命科学学院,浙江 金华 321004;2浙江省农业科学院 病毒学与生物技术研究所,浙江 杭州 310021;3浙江省农业科学院 植物保护与微生物研究所,浙江 杭州 310021; 4浙江省农业科学院 作物与核技术利用研究所,浙江 杭州 310021
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2014-03-25 发布日期:2014-07-09

Fusion expression and purification of a novel antimicrobial protein lysin in Escherichia coli

LI Jia;LIU Wei;WANG Hua;YAN Chengqi;Wang Xin;*;CHEN Jianping   

  1. 1 College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China; 2 Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; 3 Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; 4 Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2014-03-25 Published:2014-07-09

摘要: 抗菌蛋白E17G是一种通过基因改造获得的高效杀菌蛋白。为高效表达抗菌蛋白E17G并减少E17G的抗菌活性对大肠杆菌宿主菌的致死作用,将E17G基因克隆到原核表达载体pGEX6P1中,构建的重组原核表达载体pGEX6P1E17G在低温下经IPTG诱导,E17G蛋白在大肠杆菌BL21中以GSTE17G融合蛋白的形式表达,采用GST亲和层析纯化和收集GSTE17G融合蛋白。SDSPAGE和Western blotting检测结果显示,GSTE17G能在大肠杆菌中正确表达,为进一步研究E17G抗菌蛋白的生物学活性奠定了基础。

关键词: 内溶素, 大肠杆菌, 融合表达, 纯化

Abstract: E17G, a genetically modified antimicrobial protein, has high antimicrobial activities against bacteria. To reduce the antibacterial activity lethal to the Escherichia coli host cells during its expression, the E17G gene was cloned into prokaryotic expression vector pGEX6P1 to generate the fusion expression plasmid pGEX6P1E17G(GSTE17G fusion). The GSTE17G fusion protein was expressed in E. coli BL21 induced by IPTG and purified by GST affinity chromatography. GSTE17G fusion protein was detected by SDSPAGE and Western blotting, indicating successful expression of GSTE17G protein in E. coli. This study provides the basis for further analysis of the biological activity of the E17G protein.

Key words: lysin, E. coli, fusion expression, purification