河南农业科学 ›› 2020, Vol. 49 ›› Issue (6): 137-142.DOI: 10.15933/j.cnki.1004-3268.2020.06.018

• 畜牧·兽医 • 上一篇    下一篇

猪圆环病毒2b型表位嵌合病毒样颗粒E.coli中的制备及鉴定

冯华1,刘晴坤1,2,任春晓1,2,刘运超1,张改平1,2   

  1. (1.河南省农业科学院 动物免疫学重点实验室/河南省动物免疫学重点实验室/农业部动物免疫学重点实验室,河南 郑州 450002; 2.河南农业大学 生命科学学院,河南 郑州450002)
  • 收稿日期:2019-10-24 出版日期:2020-06-15 发布日期:2020-06-15
  • 通讯作者: 张改平(1960-),男,河南内黄人,研究员,中国工程院院士,博士,主要从事动物疫病免疫机制与疫苗研究。E-mail:zhanggaiping2003@163.com
  • 作者简介:冯华(1983-),男,河南安阳人,助理研究员,博士,主要从事动物疫病及免疫学研究。
  • 基金资助:
    河南省重点研发与推广专项(182102110087)

Production and Characterization of PCV2b Epitope Chimeric Virus-like Particles Expressed in E.coli

FENG Hua1,LIU Qingkun1,2,REN Chunxiao1,2,LIU Yunchao1,ZHANG Gaiping1,2   

  1. (1.Key Laboratory of Animal Immunology,Henan Academy of Agricultural Sciences/Henan Provincial Key Laboratory of Animal Immunology/Key Laboratory of Animal Immunology of Ministry of Agriculture,Zhengzhou 450002,China;2.College of Life Sciences,Henan Agricultural University,Zhengzhou 450002,China)
  • Received:2019-10-24 Published:2020-06-15 Online:2020-06-15

摘要: 为了研究一种更为高效、廉价的猪圆环病毒2型(PCV2)亚单位疫苗,针对PCV2b型Cap基因核酸序列进行优化,将其编码中和表位226LKDPPLNP233的基因序列连接于Cap基因C端(Capc),并插入PE-Sumo载体,借助大肠杆菌表达系统对Capc蛋白进行表达;利用SDS-PAGE、Western blot、动态光散射和透射电镜观察等手段,对纯化后的目的蛋白活性及其形成的结构进行初步鉴定。结果显示,嵌合Capc基因片段成功插入PE-Sumo载体,并转化到大肠杆菌BL21(DE3)中; Sumo-Capc重组蛋白在26 ℃下诱导12 h能够以可溶形式大量表达;经纯化的Capc蛋白能够与PCV2单克隆抗体特异结合,并能够自组装形成直径约为18 nm的病毒样颗粒。综上,成功构建了能够表达PCV2b型中和表位嵌合Cap的大肠杆菌表达系统,纯化得到的Capc蛋白具有良好的免疫反应性,且能够自组装成病毒样颗粒。

关键词: 猪圆环病毒2型, 中和表位, Cap蛋白, 病毒样颗粒, 候选疫苗

Abstract: To develop a high efficient and economic PCV2b subunit vaccine,the codons of PCV2 Cap gene were optimized for E.coli expression system,and the gene sequence of PCV2 neutralizing epitope 226LKDPPLNP233was conjugated at its C-terminus(Capc).After the recombinant sequence was constructed on PE-Sumo vector,recombinant chimeric Capc was expressed in E.coli.By using SDS-PAGE,Western blot,Dynamic light scattering and TEM,the immune reactivity and the structure of Capc protein were preliminarily identified.The results showed PE-Sumo-Capc vector was successfully constructed and transferred into E.coli BL21(DE3);Sumo-Capc protein was mostly expressed in soluble form after 12 h induction under 26℃ .The final purified Capc protein was able to specifically react with PCV2 Cap monoclonal antibody,and self-assembly into virus-like particles with the diameter around 18 nm.The current study successfully constructed an E.coli expression system for PCV2b neutralizing epitope chimeric Cap protein,which showed a good immunogenic reactivity and could self-assembly into virus-like particles.

Key words: Porcine circovirus type 2, Neutralizing epitope, Cap protein, Virus-like particle, Candidate vaccine

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