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Cloning, expression, identification and bioinformatics analysis of Rv3265c gene from Mycobacterium tuberculosis in Escherichia coli

文献类型： 外文期刊

作者： Wu, Qiang 1 ; Zhou, Peng 1 ; Qian, Shiyun 3 ; Qin, Xi 4 ; Fan, Zhigang 3 ; Fu, Qiongyao 3 ; Zhan, Zhinong 3 ; Pei, Hua 3 ;

作者机构： 1.Hainan Univ, Sch Agr, Haikou 571101, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Anal & Testing Ctr 454, Haikou 571101, Peoples R China

3.Hainan Med Univ, Sch Tropt & Lab Med, Haikou 571101, Peoples R China

4.Hainan Med Univ, Affiliated Hosp, Haikou 571101, Peoples R China

关键词： Mycobacterium tuberculosis;L-rhamnosyltransferase;Expression;Identification;Bioinformatics

期刊名称：ASIAN PACIFIC JOURNAL OF TROPICAL MEDICINE （ 影响因子：1.226； 五年影响因子：2.285 ）

ISSN： 1995-7645

年卷期： 2011 年 4 卷 4 期

页码：

收录情况： SCI

摘要： Objective: To clone and express Rv3265c gene of Mycobacterium tuberculosis in Escherichia coli (E. coli) under optimistic conditions, obtain and identify protein expressed, analyze the structure and characteristics of the protein using bioinformatics methods for future applications. Methods: Rv3265c gene from Mycobacterium tuberculosis H37Rv was amplified by polymerase chain reaction, and was cloned into the pET-30a vector after purification and recovery. The recombinant plasmid was sequenced and expressed in E. coli BL21(DE3), and then purified and identified by western blotting. The essential physical-chemical properties of the protein were predicated by bioinformatics tools, including subcellular location, secondary structure, domains, antigenic epitopes, etc. Tertiary structure of the protein based on homology modeling was established, while multi-sequence homological alignment and phylogenetic analysis were proformed. Results: The recombinant protein was obtained in soluble fraction from expression system in E.coli BL21(DE3) carrying pET30- Rv3265c plasmid, and Rv3265c gene was expressed correctly. Bioinformatics analysis showed the protein contained no signal peptide and transmembrane helices, located outside of membrane. Secondary structure analysis revealed it contained alpha-helix, extended strand and random coil, 46.8%, 14.6%, 38.6%, respectively. Furthermore, it possessed six potential antigenic epitopes, one glycosyl transferase domain. A simple three dimensional model of this protein was constructed by Swiss-model sever. Both sequences and structures were conservative and especial either in gene or in protein. Conclusions: Rv3265c gene might be a desirable molecular target for anti-tuberculosis drug and vaccine. The purified protein from expression will be utilized to study the kinetics of L-rhamnosyltransferase and to develope an enzyme assay for screening vaccine or drug.

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