J4 ›› 2011, Vol. 37 ›› Issue (4): 631-635.

• 基础研究 • 上一篇    下一篇

弓形虫GRA1基因的克隆与原核表达

孙玲1,刘慧颖1|2,李淑红1|宫鹏涛3|张西臣3|宁 静*   

  1. 1.吉林大学白求恩医学院病原生物学教研室|吉林 长春 130021;2.吉林省长春市绿园区疾病预防控制中心|
    吉林 长春 130062;3.吉林大学畜牧兽医学院预防兽医学系|吉林 长春 130062
  • 收稿日期:2010-12-10 出版日期:2011-07-28 发布日期:2011-07-28
  • 通讯作者: 李淑红(Tel:0431-85619574,E-mail:lish@jlu.edu.cn) E-mail:lish@jlu.edu.cn
  • 作者简介:孙 玲(1987-)|女|内蒙古自治区赤峰市人|在读医学硕士|主要从事病原微生物的研究。
  • 基金资助:

    国家科技支撑计划资助课题 (2008BAD96B11-3);吉林省发改委基金资助课题(200603)

Cloning and prokaryotic expression of GRA1 gene of Toxoplasma gondii

SUN Ling1,LIU Hui-ying1,2,LI Shu-hong1,GONG Peng-tao3,ZHANG Xi-chen3,NING Jing*   

  1. 1.Department of Pathogenobiology,Norman Bethune College of Medicine,Jilin University,Changchun
    130021,China;2.Department of Luyuan Center for Disease Control and Prevention,Jilin Province,
    Changchun 130062,China;3.Department of Animal Preventive Veterinary Medicine,School of Animal
    Science and Veterinary Medicine,Jilin University,Changchun 130062,China
  • Received:2010-12-10 Online:2011-07-28 Published:2011-07-28

摘要:

目的:克隆并构建 PET-28a-GRA1 重组表达载体,转化入大肠杆菌 E. coli BL21,诱导表达并鉴定,为进一步研究 GRA1 的生物学特性和免疫保护作用奠定实验基础。方法:根据 GenBank 中编码 GRA1 的已知基因序列设计并合成一对引物,应用 PCR 技术扩增 GRA1 基因,插入原核表达载体 PET-28a 中,构建重组表达质粒 PET-28a-GRA1,转化 E. coli BL21,IPTG 诱导后,进行 SDS-PAGE 和 Western blotting 鉴定。结果:克隆的 GRA1
基因与 GenBank 收录的基因序列同源性为100%。对重组质粒进行酶切和 PCR 鉴定,获得573 bp 大小的目的基因片段,与预期结果相符,成功地构建了重组质粒 PET-28a-GRA1。SDS-PAGE 电泳分析表明重组蛋白条带的相对分子质量约为24 000,Western blotting 显示重组蛋白能被鼠抗弓形虫血清识别。结论:成功获取 GRA1 基因,构建了 PET-28a-GRA1 重组质粒并获得了高效表达。

关键词:  刚地弓形虫;GRA1;克隆;基因表达

Abstract:

Abstract:Objective To clone the GRA1 gene and construct the prokaryotic expression vector PET-28a-GRA1,and to transform the expression vector  into E.coli BL21,then  induce and identiy,and to lay a foundation for the study on the biological characteristics and immune protection of GRA1.Methods A pair of primers were designed according to the sequence of GRA1 from GenBank.The GRA1 gene was amplified by PCR.The amplified GRA1 gene was inserted into prokaryotic expression vector PET-28a,and the constructed recombinant plasmid PET-28a-GRA1 was transformed to E.coli BL21 for expression under induction of IPTG.The expressed product was identified by SDS-PAGE and Western blotting.Results:The sequencing result showed the homology of 100% of the cloned GRA1 gene to that reported in GenBank.The positive recombinant plasmids PET-28a-GRA1 were identified by restriction endonuclease digestion and PCR,the objective gene fragment with the size of 573 bp was acquired,in accordance with the expected results,and the recombinant plasmid PET-28a-GRA1 was constructed successfully.The results of SDS-PAGE  revealed that the molecular  weight of recombinant protein PET-28a-GRA1 was 24 000 and Western blotting proved that the recombinant protein was recognized by murine antisera against Toxoplasma gondii.Conclusion The GRA1 gene has been successfully cloned,the recombinant
 plasmid PET-28a-GRA1 is generated and expressed highly in prokaryote.

Key words: Toxoplasma gondii;GRA1;cloning;gene expression

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