吉林大学学报(医学版)

• 基础研究 • 上一篇    下一篇

殊异韦荣菌sahH基因的克隆、表达和纯化

孙晓宇1,何钟勤2,刘晓红1,高心1,钟丞3,薛莹1   

  • 收稿日期:2013-03-05 出版日期:2013-07-28 发布日期:2013-08-17
  • 通讯作者: 高 心(Tel:0431-85579511, E-mail:ymny870@163.com) E-mail:ymny870@163.com
  • 作者简介:孙晓宇(1987-),女,吉林省长春市人,医学硕士,主要从事殊异韦荣菌基因和牙体牙髓方面的研究。
  • 基金资助:

    吉林省科技厅自然科学基金资助课题(201015204)

Cloning,expression,and purification of S-adenosyl-L-homocysteine hydrolase gene  of  Veillonella dispar

SUN Xiao-yu1,HE Zhong-qin2,LIU Xiao-hong1,GAO Xin1,ZHONG Cheng3,XUE Ying1   

  1. 1.吉林大学口腔医院牙体牙髓病科,吉林 长春130021;2.吉林大学中日联谊医院口腔科,吉林 长春 130033;3.吉林省长春市中心医院口腔科,吉林 长春 130051)
  • Received:2013-03-05 Online:2013-07-28 Published:2013-08-17

摘要:

目的:对殊异韦荣菌S-腺苷同型半胱氨酸水解酶(sahH)基因进行克隆、鉴定、表达和纯化,为研究龋病的微生物致病机制提供理论依据。方法:提取殊异韦荣菌基因组DNA,采用PCR方法扩增sahH基因序列,构建pET28a-sahH重组质粒,转化到大肠杆菌(E.coli)BL21(DE3)感受态细胞中,酶切、PCR鉴定和测序后,IPTG诱导蛋白表达,并进行分离纯化。结果: PCR扩增产物全长为1 410 bp。测序结果经BLAST软件分析,与GenBank中所报道的绿脓假单胞菌sahH基因序列进行对比分析,其同源性为99%。该基因序列已登陆GenBank,序列号为KC477409。SDS-PAGE分析,重组质粒在E.coli JM109中表达并纯化,得到的融合蛋白相对分子质量约为50 000,诱导5 h蛋白表达量最高,浓缩后蛋白浓度为5.4 g/L。Western blotting法得到的蛋白条带与目的蛋白大小相符。结论:成功克隆了殊异韦荣菌sahH基因,并通过基因序列和氨基酸分析证明其具有完整的阅读框架,且重组载体表达出融合蛋白,分离纯化得到目的蛋白。

关键词: 殊异韦荣菌, S-腺苷同型半胱氨酸水解酶, 基因克隆, 基因表达, 纯化

Abstract:

Abstract:Objective To clone,identify,express and purify the S-adenosyl-L-homocysteine hydrolase (sahH) gene of Veillonella dispar and to provide theoretical basis for  the mechanism of dental caries disease. Methods The DNA  exacted from Veillonella dispar sahH gene were amplified by PCR method,and the recombinant plasmid PET28a-sahH was constructed and transformed into E.coil BL21.The sequencing was performed after PCR identification and restriction enzyme digestion.Then the protein expression was induced by IPTG and the protein was purified.Results The PCR product  was 1 410 bp.The sequencing data was analyzed by BLAST software.The homology of the sequencing result was 99 % compared with the sahH gene of Pseudomonas aeruginosa strain PAO1 which was reported in GenBank.The sequence had been submitted to the NCBI GenBank,and the accession number was KC477409.With SDS-PAGE electrophoresis,the recombinant plasmid PET28a-sahH was expressed and purified in  E.coil JM109,and the molecular weight of 50 000 was noted in sahH protein bands.The highest amount of protein expression was generated 5 h after  induction,The protein concentration was 5.4 g/L after concentrated.The size of protein obtained by Western blotting method was corresponded with target  protein.Conclusion The sahH gene of Veillonella dispar is successfully cloned,and it is proved to have a full reading framework through the analysis on gene sequences and amino acids.And the recombinant vector could  express fusion protein,and the interest protein is obtained by isolation and  purification.

Key words: Veillonella dispar, S-adenosyl-L-homocysteine hydrolase, gene cloning, gene expression, purification

中图分类号: 

  • R378.1