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出血性大肠杆菌O157eae-stx1/2B融合基因的构建和表达
引用本文:陈萍,刘军,祝令伟,孙洋,郭学军,齐翀,冯书章,郑明光.出血性大肠杆菌O157eae-stx1/2B融合基因的构建和表达[J].中国兽医学报,2005,25(3):270-272.
作者姓名:陈萍  刘军  祝令伟  孙洋  郭学军  齐翀  冯书章  郑明光
作者单位:解放军军事医学科学院,军事兽医研究所,吉林,长春,130062
基金项目:国家自然科学基金资助项目(30270985)
摘    要:构建表达eae和stx1/2B的融合基因,克隆eae基因的C端280个氨基酸残基(Int280)基因部分,以正确地阅读框定向插入到含有stx1/2B融合基因的质粒,构建重组质粒,将其转化于BL21(DE3),用IPTG进行诱导表达,经SDS—PAGE电泳检测,该融合蛋白获得了高效表达。薄层扫描分析表明:目的蛋白表达量占菌体总蛋白含量的50.67%。由于该融合蛋白由eae、stx1B、stx2B等三部分抗原组成,可刺激机体产生针对紧密素和StxB的抗体,在EHEC O157亚单位疫苗设计或单克隆抗体抗制备中具有重要价值。

关 键 词:大肠杆菌O157  融合基因  构建  出血性  融合蛋白  氨基酸残基  总蛋白含量  单克隆抗体  亚单位疫苗  重组质粒  诱导表达  IPTG  电泳检测  PAGE  高效表达  目的蛋白  薄层扫描  e基因  SDS  表达量  分析表  C端
文章编号:1005-4545(2005)03-0270-03
修稿时间:2004年12月22

Construction and Expression of eae-stx1/2B Fusion Gene from EHEC O157:H7
CHEN Ping,LIU Jun,ZHU Ling-wei,SUN Yang,GUO Xue-jun,QI Chong,FENG Shu-zhang,ZHENG Ming-guang.Construction and Expression of eae-stx1/2B Fusion Gene from EHEC O157:H7[J].Chinese Journal of Veterinary Science,2005,25(3):270-272.
Authors:CHEN Ping  LIU Jun  ZHU Ling-wei  SUN Yang  GUO Xue-jun  QI Chong  FENG Shu-zhang  ZHENG Ming-guang
Institution:CHEN Ping,LIU Jun,ZHU Ling-wei,SUN Yang,GUO Xue-jun,QI Chong,FENG Shu-zhang*,ZHENG Ming-guang
Abstract:To construct eae-stx1/2B fusion gene,the DNA fragment encoding C-terminal 280 amino acids(Int280) of intimin was fused in frame with the stx1/2B gene.We created a recombinant plasmid by insertion of eae-stx1B-stx2B fusion gene into pET-28a,the recombinant plasmid was transformed into BL21(DE_3),and the fusion protein was expressed in E.coli BL21 efficiently with IPTG.Analysis of SDS-PAGE and thin layer scanning results showed that amount of expressed fusion protein was 50.67% in total of bacteria protein.Because the fusion protein was consisted of eae Int280,stx1B and stx2B antigens,it can evoke immune responses against Int280,Stx1B and Stx2B.The eae-stx1/2B fusion protein expressed in E.coli could offer an important ingredient that should be consider in construction of recombinant EHEC O157 vaccine or preparation of experimental material for the monoclonal antibody.
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