基础医学与临床 ›› 2009, Vol. 29 ›› Issue (5): 499-503.

• 研究论文 • 上一篇    下一篇

九种冠状病毒核衣壳蛋白的原核表达及纯化

许慧雯 王彦斌 吴超 王健伟 洪涛   

  1. 中国医学科学院 北京协和医学院 病原生物学研究所 中国医学科学院 北京协和医学院 病原生物学研究所
  • 收稿日期:2009-03-02 修回日期:2009-03-13 出版日期:2009-05-25 发布日期:2009-05-25
  • 通讯作者: 王健伟

Expression and purification of nine nucleocapsid proteins from coronaviruses

Hui-wen XU, Yan-bin WANG, Chao WU, Jian-wei WANG, Tao HONG   

  1. Institute of Pathogen Biology,CAMS& PUMC Institute of Pathogen Biology,CAMS& PUMC
  • Received:2009-03-02 Revised:2009-03-13 Online:2009-05-25 Published:2009-05-25
  • Contact: Jian-wei WANG,

摘要: 目的 探索SARS冠状病毒(SARS-CoV)、HCoV-229E、HCoV-OC43、HCoV-NL63、HCoV-HKU1等5种人类冠状病毒以及牛冠状病毒(BCoV)、鼠肝炎病毒(MHV)、猫传染性腹膜炎病毒(FIPV)和禽传染性支气管炎病毒(IBV)4种动物冠状病毒核衣壳(N)蛋白在大肠杆菌中克隆表达及纯化条件。方法 利用原核表达载体pET30a(+)经IPTG诱导表达重组蛋白,并采用离子交换及镍离子螯合亲和层析法对重组蛋白进行纯化,用SDS-PAGE及Western blot对重组蛋白进行鉴定。结果 成功表达、纯化出9种冠状病毒N蛋白,纯度达90%以上。结论 在原核系统中表达得到了高纯度的9种冠状病毒N蛋白,为相关功能性研究奠定了基础。

关键词: 冠状病毒, 核衣壳蛋白, 纯化

Abstract: Objective To explore the conditions of the expression and purification of nucleocapsid proteins of human coronaviruses SARS-CoV, HCoV-229E, HCoV-OC43, HCoV-NL63 and HCoV-HKU1, animal coronaviruses bovine coronavirus, murine hepatitis virus, feline infectious peritonitis virus, and infectious bronchitis virus. Methods The pET-30a-based recombinant plasmids containing full length nucleocapsid(N) protein of coronaviruses were transformed into E.coil BL21(DE3) competent cells and were induced to express N proteins by IPTG. The expression products were purified by ion exchange chromatography and Ni 2+ affinity chromatography, and were verified by SDS-PAGE and Western blot. Results Nine coronavirus nucleocapsid proteins with correct Mr were solubly expressed and highly purified with purity >90%. Conclusion Successfully expressed nine recombinant nucleocapsid proteins with high purity in E. Coli,which provides materials to study the function of these coronavirus N proteins.

Key words: SARS-CoV, Nucleocapsid protein, Purification