中国寄生虫学与寄生虫病杂志 ›› 2009, Vol. 27 ›› Issue (6): 18-533.

• 研究简报 • 上一篇    下一篇

微小牛蜱Bm86基因的原核表达与表达条件的优化

马米玲,关贵全,李有全,刘爱红,任巧云,牛庆丽,殷宏,罗建勋*   

  1. 家畜疫病病原生物国家重点实验室,甘肃省动物寄生虫病重点实验室,中国农业科学院兰州兽医研究所,兰州 730046
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-12-30 发布日期:2009-12-30

Prokaryotic Expression of Bm86 Gene of Boophilus microplus and Optimization of the Expression Condition

MA Mi-ling,GUAN Gui-quan,LI You-quan,LIU Ai-hong,REN Qiao-yun,NIU Qing-li,YIN Hong,LUO Jian-xun*   

  1. State Key Laboratory of Veterinary Etiological Biology,Key Laboratory of Veterinary Parasitology of Gansu Province,Lanzhou Veterinary Research Institute,Chinese Academy of Agricultural Sciences,Lanzhou 730046,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-12-30 Published:2009-12-30

摘要: 根据微小牛蜱Bm86基因序列设计引物,在重组质粒pMD18-T-Bm86中克隆,并将其定向亚克隆入原核表达载体pGEX-4T-1,转化至大肠埃希菌BL21(DE3)株,用不同浓度异丙基-β-D-硫代半乳糖苷(IPTG)在不同时间进行诱导表达。十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)检测结果表明,37 ℃条件下经1 mmol/L IPTG诱导8 h后,目的重组蛋白表达量最大,表达相对分子质量(Mr)约为94 000的包涵体蛋白,与预期大小一致,目的蛋白约占蛋白总量的29%。蛋白质印迹(Western blotting)分析表明,该重组蛋白可被兔抗微小牛蜱全蜱阳性血清所识别。

关键词: 微小牛蜱, Bm86基因, 表达

Abstract: A pair of specific primers was designed based on the reported Bm86 gene of Boophilus microplus,the Bm86 gene was cloned by PCR using the plasmid pMD18-T-Bm86 as templates,and subcloned into the prokaryotic plasmid pGEX-4T-1. The recombined plasmid was transformed into E. coli BL21(DE3) and followed by expression of the protein induced by different concentration of IPTG for different time. SDS-PAGE showed that the recombinant plasmid pGEX-4T-1/Bm86 expressed a fusion protein Bm86-GST (Mr 94 000) after being induced with IPTG. High level expression of Bm86-GST was found at 1 mmol/L IPTG condition after incubation for 8 h at 37 ℃, and the expression level of the recombinant Bm86-GST reached up to 29% of total E. coli proteins. Western blotting analysis showed that the recombinant Bm86-GST was recognized by the rabbit anti-B. microplus positive serum.

Key words: Boophilus microplus, Bm86 gene, Expression