中国寄生虫学与寄生虫病杂志

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恶性疟原虫裂殖子表膜蛋白MSPDBL2-DBL2结构域的克隆表达和抗原性分析

仰梦佳1,王素蓉1,诸葛洪祥1 *,陈军虎2   

  1. 1 苏州大学基础医学与生命科学学院,苏州 215123;2 中国疾病预防控制中心寄生虫病预防控制所,卫生部寄生虫病原与媒介生物学重点实验室,世界卫生组织疟疾、血吸虫病和丝虫病合作中心,上海 200025
  • 出版日期:2014-10-30 发布日期:2015-01-06

Cloning,Expression and Antigenic Analysis of Merozoite Surface Protein MSPDBL2-DBL2 Domain from Plasmodium falciparum

YANG Meng-jia1,WANG Su-rong1,ZHUGE Hong-xiang1 *,CHEN Jun-hu2   

  1. 1 School of Biology and Basic Medical Sciences,Soochow University,Suzhou 215123,China;2 National Institute of Parasitic Diseases,Chinese Center for Disease Control and Prevention;the Key Laboratory of Parasite and Vector Biology,Ministry of Health;WHO Collaborating Center for Malaria,Schistosomiasis and Filariasis,Shanghai 200025,China
  • Online:2014-10-30 Published:2015-01-06

摘要:

目的  克隆、表达恶性疟原虫(Plasmodium falciparum)疫苗候选分子-裂殖子表膜蛋白MSPDBL2 (PF10_0355)的DBL2结构域,并分析其抗原性。 方法  PCR扩增实验室培养的恶性疟原虫标准株3D7的基因组DNA,采用无缝克隆技术快速连接目的片段和质粒载体,构建重组表达质粒pET28a-DBL2,转化至大肠埃希菌BL2l(DE3)中,异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达并经亲和层析获得纯化的重组蛋白rDBL2。分别以恶性疟患者血清、健康者血清、恶性疟患者混合血清和健康者混合血清作为一抗,蛋白质印迹(Western blotting)分析该重组蛋白的抗原性。 结果  PCR扩增恶性疟原虫疫苗候选分子-裂殖子表膜蛋白MSPDBL2 的DBL2基因,获得长约950 bp片段,与理论值相符。菌落PCR鉴定和测序结果均显示,重组质粒pET28a-DBL2构建成功。十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)结果显示,经IPTG诱导并经亲和层析纯化后获得相对分子质量(Mr)约为34 000的包涵体蛋白。Western blotting分析结果显示,重组蛋白rDBL2可被恶性疟患者血清识别,而与健康者血清无特异反应。 结论  克隆和表达了恶性疟原虫裂殖子表膜蛋白MSPDBL2-DBL2结构域,重组蛋白rDBL2有良好的抗原性。

关键词: 恶性疟原虫, 裂殖子, 原核表达, 抗原性

Abstract:

Objective  To clone and express the DBL domain of Plasmodium falciparum merozoite surface protein MSPDBL2(DBL2), and investigate its antigenicity.  Methods  The DBL2 fragment was amplified by PCR and cloned into pET28a vector. The recombinant pET28a-DBL2 plasmid was transformed into E. coli BL21(DE3) and protein expression was induced by IPTG. The expressed product was purified by Ni-NTA affinity chromatography, and analyzed by SDS-PAGE and Western blotting.  Results  DBL2 gene fragment of Plasmodium falciparum merozoite surface protein MSPDBL2(950 bp) was obtained by PCR. The recombinant pET28a-DBL2 plasmid was identified by PCR, double enzyme digestion, and DNA sequencing. The recombinant DBL2 protein was expressed in an inclusion body form with Mr 340 000 after being induced with IPTG. Moreover, the purified recombinant DBL2 protein was recognized by sera from patients with falciparum malaria.  Conclusion  The recombinant pET28a-DBL2 plasmid has been constructed. The purified rDBL2 protein shows adequate antigenicity.

Key words: Plasmodium falciparum, Merozoite, Prokaryotic expression, Antigenicity