华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (1): 84-87.

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hlL-2/IFN-γ嵌合基因原核表达质粒的构建与表达

邵亚明1 田泽维2 罗发兴1 陈光明2 杨富强2   

  1. 1.华南理工大学 轻工与食品学院,广东 广州 510640;2.解放军458医院 全军肝病研究中心,广东 广州 510602
  • 收稿日期:2004-04-13 出版日期:2005-01-25 发布日期:2005-01-25
  • 通信作者: 邵亚明(1980-),男,硕士生,主要从事生物制药方面的研究. E-mail:symhhit@sohu.com
  • 作者简介:邵亚明(1980-),男,硕士生,主要从事生物制药方面的研究.
  • 基金资助:

    国家高技术研究发展计划(863计划)资助项目(2001AA217141)

Construction and Expression of the Plasmid of hlL-2/IFN-γ Chimeric Gene

Shao Ya-ming1  Tian Ze-wei2  Luo Fa-xing1  Chert Guang-ming2  Yang Fu-qiang2   

  1. 1.College of Light Chemistry and Food Science,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.PLA Liver Disease Research Center,the 458th Hospital of PLA,Guangzhou 510602,Guangdong,China
  • Received:2004-04-13 Online:2005-01-25 Published:2005-01-25
  • Contact: 邵亚明(1980-),男,硕士生,主要从事生物制药方面的研究. E-mail:symhhit@sohu.com
  • About author:邵亚明(1980-),男,硕士生,主要从事生物制药方面的研究.
  • Supported by:

    国家高技术研究发展计划(863计划)资助项目(2001AA217141)

摘要: 为构建hlL-2/IFN-γ. 嵌合基因原核表达质粒,筛选其高效表达工程茵,设计特异性引物,PCR扩增目的基因并克隆至pPROEX HTb质粒NcoⅠ/Hindn Ⅲ 位点,经双酶切及序列测定筛选阳性克隆,IPTG诱导工程茵后以SDS-PAGE电泳鉴定目的蛋白的表达情况,并测定其抗原性和生物学活性,结果成功构建了工程茵Top10 F’[hlL-2/IFN-γ ],经优化表达条件后,目的蛋白表达量约占茵体总蛋白的30% ,分子质约为34 ku.ELISA和Western—blot实验结果表明,目的蛋白能特异性结合抗IFN-γ 抗体,呈阳性反应,生物学活性测定显示其hlL-2和IFN-γ 比活性分别为1.7×10 7U/mg与3.2×106U/mg.

关键词: 白细胞介素-2, 干扰素-&gamma, 嵌合基因, 表达, 大肠杆菌

Abstract:

In order to construct the plasmid of hlL-2/IFN-γ chimeric gene and screen high-level expressing bacteria,hlL-2/IFN-γ chimeric gene amlzIlifted by PCR with specific primers was cloned into NcoⅠ/Hindn Ⅲ sites of pPROEX HTb plasmid vector,and the recombinant was screened by means of double enzyme digestion and sequencing.The proteins expressed by recombinant E.coli Top10 F’/[hlL-2/IFN-γ ]were analyzed with SDS-PAGE,and tested its antigenecity and biological activity.thus successfully constructing the plasmid.After optimizing the expression conditions.the recombinant strain expresses the target fusion protein with a relative molecular mass of 34 ku and comprises 30% of the total bacteria protein.The results of EHSA and Western-blot analyses indicate that the recombinant strain can specially combine with anti-IFN-γ- antibody.Moreover,the results of activity measuration indicate that the activities of lL-2 and IFN-γ respectively achieve 1.7×107 U/mg and 3.2×106U/mg.

Key words: hlL-2, IFN-&gamma, chimeric gene, expression, E.coli