中国畜牧兽医

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猪α干扰素与白介素-18融合基因的克隆、原核表达及其抗病毒活性的初步研究

张盼盼,何静,康银峰,向斌,任涛   

  1. (华南农业大学兽医学院,广东广州  510642

  • 修回日期:2014-03-04 出版日期:2014-06-20 发布日期:2014-07-24
  • 通讯作者: 任涛(1968—),男,湖北人,教授, 博士生导师。E-mail:rentao@scau.edu.cn;Tel:020-85283054
  • 作者简介:张盼盼(1988—),女,安徽人,硕士生,研究方向:预防兽医学。
  • 基金资助:

    公益性行业(农业)科研专项(201303033);广东省科技计划项目(2012A020800006)。

Cloning and Prokaryotes Expression of Porcine Interferon-α and Interleukin-18 Fusion Gene and Detection of its Antiviral Activity

ZHANG Pan-pan, HE Jing, KANG Yin-feng, XIANG Bin, REN Tao   

  1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China

  • Revised:2014-03-04 Online:2014-06-20 Published:2014-07-24

摘要: 为探索猪α干扰素(poIFN-α)与白介素-18(poIL-18)融合基因的抗病毒效果,本研究通过融合PCR,以质粒pMD18-T/poIFN-α和pMD18-T/poIL-18为模板扩增猪IFNα-IL18(poIFNα-IL18)融合基因。将poIFNα-IL18融合基因插入原核表达载体pET-28b(+)构建重组表达质粒pET-28b/poIFNα-IL18,转化大肠杆菌BL21感受态细胞进行诱导表达,SDS-PAGE分析重组表达蛋白;经镍琼脂糖凝胶柱亲和层析纯化后,用微量细胞病变抑制法在PK-15/VSV系统上进行抗病毒活性测定。结果表明成功构建重组表达质粒pET-28b/poIFNα-IL18;SDS-PAGE可检测到分子质量为37 ku左右的蛋白条带,与目的蛋白大小相近;经镍琼脂糖凝胶柱亲和层析纯化,获得高纯度重组蛋白;用微量细胞病变抑制法在PK-15/VSV系统上检测到重组蛋白poIFNα-IL18比单一蛋白poIFN-α和poIL-18的抗病毒活性显著,其抗水疱性口炎病毒(vesicular stomatitis virus,VSV)活性分别为1.03×105、1.28×104及0.11×104 U/mg。

关键词: 融合基因; 克隆; 表达; 抗病毒活性

Abstract: In order to explore the antiviral effect of porcine interferon-α and interleukin-18 fusion gene (poIFN-α-IL-18), poIFN-α-IL-18 was amplified from pMD18-T/IFN-α and pMD18-T/IL-18 by using fusion-PCR in this study. The recombinant expression plasmid pET-28b/IFNα-IL18 was constructed by inserting poIFNα-IL18 into vector pET-28b(+) separately. SDS-PAGE was used for analyzing the protein after induced by IPTG. The protein was purified by Ni2+-NTA. Antiviral activities of the purified protein were tested by cytopathogenic effect inhibition assay. Results showed that the recombinant expression plasmid pET-28b/IFNα-IL18 was successfully constructed. SDS-PAGE could detect the protein bands about 37 ku. After Ni2+-NTA affinity chromatography purification, the activity of purified fusion protein against astrovirus was better than the single protein. Antiviral activities of the purified proteins, poIFN-α-IL-18, poIFN-α and poIL-18, were about 1.03×105,1.28×104 and 0.11×104 U/mg.

Key words: fusion gene; cloning; expression; antiviral activity