中国畜牧兽医

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猪流行性腹泻病毒S蛋白的截短表达、活性检测及多克隆抗体制备

王领兄1,张婕2   

  1. 1.青海省大通县城关镇畜牧兽医站,青海大通  8101022.青海省大通县桥头镇新城畜牧兽医站,青海大通  810199

  • 收稿日期:2013-08-12 出版日期:2014-05-20 发布日期:2014-06-25
  • 作者简介:王领兄(1982—),女,青海人,学士,助理兽医师,研究方向:畜牧兽医。

Truncated Expression and Activity Detection of Porcine Epidemic Diarrhea Virus S Protein,and Preparation of its Polyclonal Antibody

WANG Ling-xiong1,ZHANG Jie2   

  1. 1.Chengguan Animal Husbandry and Veterinary Station Datong CountyQinghai ProvinceDatong 810102China;2.Qiaotou Animal Husbandry and Veterinary Station Datong CountyQinghai Province Datong 810199China

  • Received:2013-08-12 Online:2014-05-20 Published:2014-06-25

摘要: 为高效表达猪流行性腹泻病毒(porcine epidemic diarrhea virus,PEDV)S蛋白并制备特异性的多克隆抗体,本研究利用RT-PCR方法扩增PEDV S基因主要抗原区域,将其亚克隆至pET30a(+)原核表达载体,转化BL21(DE3)表达菌,IPTG诱导表达重组蛋白,亲和层析法纯化重组蛋白,免疫印迹检测重组蛋白的活性,将重组蛋白免疫新西兰大白兔制备多克隆抗体,间接ELISA测定其抗体效价。经BamHⅠ/Hind Ⅲ双酶切鉴定获得了pET30a-S原核表达重组质粒,用终浓度为1 mmol/L IPTG诱导表达4 h后,获得了以包涵体形式表达的重组S蛋白,重组S蛋白纯化后免疫印迹检测结果显示具有良好的活性和特异性,间接ELISA测定制备的兔抗S蛋白多克隆抗体的效价为1∶25600。本研究截短表达了PEDV S蛋白并制备了多克隆抗体,为进一步开发猪流行性腹泻(porcine epidemic diarrhea,PED)免疫学快速检测试剂奠定了基础,为S蛋白的结构与功能的研究及抗原表位的鉴定提供了条件。

关键词: 猪流行性腹泻病毒; S蛋白; 截短表达; 活性检测; 多克隆抗体

Abstract: In order to highly express S protein of porcine epidemic diarrhea virus (PEDV) and prepare its specific polyclonal antibody,the main antigen region of S gene was amplified by PCR method,subcloned into pET30a(+) prokaryotic expression vector,transformed into BL21(DE3) expression bacteria,and induced by IPTG.The recombinant S protein was purified by affinity chromatography,its activity was detected by Western blotting,New Zealand White rabbits were immuned using the recombinant S protein to prepare polyclonal antibody,and detection of the antibody titer by indirect ELISA was conducted. After BamHⅠ/HindⅢ double enzyme digestion, we obtained pET30a-S recombinant plasmid,with induction of 1 mmol/L IPTG for 4 h,the recombinant S protein were expressed in inclusion body form,after purification and Western blotting,the protein showed good activity and specificity,antibody titer of polyclonal antibody against S protein was 1∶25600 detected by indirect ELISA. In this study PEDV S protein was successfully truncated expressed and its polyclonal antibody was also prepared,which layed a foundation for further development of rapid immunology detection kit of porcine epidemic diarrhea,and provided a condition for the study of structure and function of S protein and identification of the antigenic epitopes.

Key words:

porcine epidemic diarrhea virus; S protein; truncated expression; activity detection; polyclonal antibody