生物技术通报 ›› 2017, Vol. 33 ›› Issue (3): 169-174.doi: 10.13560/j.cnki.biotech.bull.1985.2017.03.024

• 研究报告 • 上一篇    下一篇

猪细小病毒1型VP2基因的原核表达及反应原性分析

欧云文1,2, 马小元2, 张杰2, 丁耀忠2, 张永光2, 贾宁1   

  1. 1. 甘肃农业大学动物医学院,兰州 730070;
    2. 中国农业科学院兰州兽医研究所 家畜疫病病原生物学国家重点实验室,兰州 730046
  • 收稿日期:2016-08-09 出版日期:2017-03-26 发布日期:2017-03-07
  • 作者简介:欧云文,男,硕士,研究方向:人兽共患病及公共卫生学研究;E-mail:oyw813@163.com
  • 基金资助:
    国家国际合作项目(2012DFG31890),国家自然科学基金项目(31072143)

Prokaryotic Expression of Gene VP2 of Porcine Parvovirus Type 1 and the Reactinogenicity Analysis of the Expressed Protein

OU Yun-wen1,2, MA Xiao-yuan2, ZHANG Jie2, DING Yao-zhong2, ZHANG Yong-guang2, JIA Ning1   

  1. 1. College of Veterinary Medicine,Gansu Agricultural University,Lanzhou 730070;
    2. State Key Laboratory of Veterinary Etiological Biology,Lanzhou Veterinary Research Institute,Chinese Academy of Agricultural Sciences,Lanzhou 730046
  • Received:2016-08-09 Published:2017-03-26 Online:2017-03-07

摘要: 旨在研究猪细小病毒1型(PPV1)VP2蛋白(第155-439位氨基酸)的抗原性,为开发PPV1的检测方法奠定基础。以PPV1型AV31株的DNA为模板,扩增获得849 bp的目的片段,扩增产物克隆入pET30a(+)原核表达载体,构建pET30a-PPV1-VP2(155-439 aa)重组质粒,转入大肠杆菌BL21(DE3);在37℃,以1 mmol/L IPTG诱导表达6 h;采用Ni-NTA树脂亲和层析纯化重组蛋白,并用不同浓度的尿素对纯化蛋白进行复性。SDS-PAGE分析表明,该VP2编码基因在大肠杆菌中得到表达,蛋白大小约为39 kD;Western blot检测结果表明,该重组蛋白与PPV1阳性血清发生特异性反应,与NA-PRRSV和PCV2阳性血清不发生交叉反应。该实验成功构建了PPV1-VP2(155-439 aa)原核表达载体,实现了在大肠杆菌中的表达,纯化后的复性蛋白具有较好的反应原性。

关键词: 猪细小病毒1型, VP2基因, 原核表达, 反应原性

Abstract: This experiment is aimed to study the antigenicity of VP2 protein(amino acid 155-439)of porcine parvovirus type 1(PPV1)for laying a base for the development of detecting PPV1. The 849 bp target fragment was amplified using the DNA of strain AV31of PPV1 as the template. The product was cloned into pET30a(+)vector,and recombinant plasmid pET30a-PPV1-VP2(amino acid 155-439)was constructed,then transferred into Escherichia coli BL21(DE3)for the 6 h induced expression by IPTG. The recombinant protein was purified by Ni-NTA,and refolded by different concentration of urea. The results of SDS-PAGE showed that the gene VP2 was successfully expressed in E. coli BL21(DE3)with a relative molecular weight of 39 kD. The results of Western blot showed that this recombined protein specifically reacted with PPV1 positive serum,while no cross reaction with NA-PRRSV and PCV2 positive serum. This study achieved the aims:the recombinant vector pET30a-PPV1-VP2 was successfully constructed,and the gene was successfully expressed in E. coli,and the purified and re-folded protein demonstrated promising reactinogenicity .

Key words: porcine parvovirus type 1(PPV1), VP2 gene, prokaryotic expression, reactinogenicity