生物技术通报 ›› 2016, Vol. 32 ›› Issue (7): 194-199.doi: 10.13560/j.cnki.biotech.bull.1985.2016.07.028

• 研究报告 • 上一篇    下一篇

肺炎链球菌TCSs中WalR的克隆表达、保守性及抗原表位分析

韩道宾1, 骆诗露1, 黄健2, 朱杰华2, 陈泽慧2, 闵迅1   

  1. 1. 遵义医学院医学检验系,遵义 563000;
    2. 遵义医学院附属医院检验科,遵义 563000
  • 收稿日期:2015-12-02 出版日期:2016-07-25 发布日期:2016-07-25
  • 作者简介:韩道宾,男,硕士研究生,研究方向:细菌致病分子机制研究;E-mail:you15865885832@126.com
  • 基金资助:
    国家自然科学基金资助项目(81460317),贵州省科技攻关项目(黔科合SY字(2012)3092号)

Clone and Expression of WalR in Streptococcus pneumonia TCSs and Analyzation of Conservation and Antigenic Epitope

HAN Dao-bin1, LUO Shi-lu1, HUANG Jian2, ZHU Jie-hua2, CHEN Ze-hui2, MIN Xun1   

  1. 1. Department of Medical Laboratory of Zunyi Medical University,Zunyi 563000;
    2. Clinical Laboratory Department of Zunyi Medical University Affiliated Hospital,Zunyi 563000
  • Received:2015-12-02 Published:2016-07-25 Online:2016-07-25

摘要: 通过构建PET28a-WalR表达载体并在大肠杆菌BL21中表达WalR重组蛋白,以评价其对C57小鼠的免疫原性;并分析其在不同血清型肺炎链球菌中的保守性和B细胞的抗原表位。以肺炎链球菌D39血清型WalR基因为模板,构建重组质粒PET28a-WalR并转入BL21诱导表达目的蛋白质。采用ClustalX 2.1软件对WalR蛋白在不同血清型S.pn中的保守性进行分析;利用DNASTAR软件对其B细胞抗原表位进行分析。结果显示,成功构建PET28a-WalR重组表达载体,经IPTG诱导后有大量高纯度的目的蛋白质,但其主要以包涵体形式存在;WalR蛋白在不同血清型肺炎链球菌中高达99.4%,其B细胞抗原表位可能位于9-16、35-42、95-111、113-135、150-161、200-218等氨基酸序列位点。成功获得大量以包涵体形式表达的肺炎链球菌WalR重组蛋白,并对其保守性和抗原表位进行了系统分析。

关键词: 肺炎链球菌, WalR, 重组蛋白, 保守性, 抗原性

Abstract: This work aims to express WalR protein in Escherichia coli BL21 through constructing recombinant expression vector PET28a-WalR and to analyze the immunogenicity in the experimental animal C57 mice,as well as to test the conservation in differentStreptococcus pneumonia serotypes and B cell antigenic epitopes. Using the WalR gene of S. pneumonia D39 as the template,the recombinant expression vector PET28a-WalR was constructed and then transferred into Escherichia coli BL21 for induced expressing target protein. The conservation of WalR protein in varied S. pneumonia serotypes was analyzed by ClustalX 2.1 software,and the B cell antigenic epitopes was analyzed by DNASTAR Lasergene v7.1. As result,recombinant expression vector PET28a-WalR was constructed successfully and much target protein was obtained by inducement of IPTG,however mainly in inclusion body. The conservation of WalR protein was up to 99.4% among different S. pneumonia serotypes,and the antigenic epitopes of WalR protein were likely located in 9-16,35-42,95-111,113-135,150-161,and 200-218 of amino acid sequence. In conclusion,recombinant S. pneumonia WalR protein in the form of inclusion body was successfully acquired,and the conservation and antigenic epitope were analyzed.

Key words: Streptococcus pneumonia, WalR, recombinant protein, conservation, antigenicity