华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

变形链球菌葡聚糖结合蛋白A真核表达质粒pcDNA3.1/GBD在哺乳动物细胞中的表达

苏凌云1,吴补领1,李福洋2,陆 群1   

  1. 1.第四军医大学口腔医院 牙体病科;2.第四军医大学基础部生化与分子生物学教研室,陕西 西安710032
  • 收稿日期:2004-02-25 修回日期:2004-02-25 出版日期:2004-02-20 发布日期:2004-02-20
  • 通讯作者: 吴补领, Tel:029-3376073
  • 作者简介:苏凌云(1965-),女,陕西人,副主任医师,博士
  • 基金资助:
    高等学校骨干教师资助计划资助项目(2000年)

Expression of GBD Gene ofStreptococcus MutansGlucan Binding Protein A in Mammalian Cells

SULing-yun1,WUBu- ling1,LI Fu-yang2,LUQun1   

  1. 1.Dept.ofOral Medicine,College ofStomatology,The Fourth Military Medical University, Xi’an710032,China;2.Dept.ofBiochemistry,The Fourth MilitaryMedical University,Xi’an710032,China
  • Received:2004-02-25 Revised:2004-02-25 Online:2004-02-20 Published:2004-02-20

摘要:

目的 观察变形链球菌葡聚糖结合蛋白A(GbpA)的葡聚糖结合区(GBD)真核表达质粒pcDNA3·1/GBD在哺乳动物细胞COS-7的表达情况。方法 通过基因重组技术构建真核表达质粒pcDNA3·1/GBD,通过脂质体转染法将其转染至COS-7细胞,通过免疫组化SABC法检测其在COS-7细胞的表达。结果 pcDAN3·1/GBD质粒转染的细胞质呈棕黄色染色,胞核无着色,pcDAN3·1空载体转染的细胞质及胞核无着色,空白对照组也无着色。结论 质粒 pcDAN3·1/GBD转染COS-7后能够在细胞内翻译、表达,表达的蛋白质位于细胞质中,可与抗GbpA抗体特异性结合,具有抗原性,可作为基因疫苗。

关键词: 变形链球菌, 葡聚糖结合蛋白, 哺乳动物细胞, 基因表达

Abstract:

Objective To evaluate the expression of recombinant plasmid pcDNA3·1/GBD of glucan binding protein ofStrepto- coccus mutansin mammalian cells COS-7.Methods Eukaryotic plasmid carrying encoding gene of GBD ofStreptococcus mutans gbpAwas constructed and the plasmid was introduced into COS-7 cells by Lipofectamine reagent. The transient expressed protein in COS-7 cells was detected by immunochemistry technique.Results The positive expression was detected in plasma of the cells which were transfected with recombinant plasmid pcDNA3·1/GBD. The cells which were transfected with pcDNA3·1 were nega- tive.Conclusion GBD can translate and express in COS-7 cells aftertransfectedwith recombinant plasmid pcDNA3·1/GBD. The expressed protein locates in the plasma and the protein is able to combine with anti-GbpA antibody. The expressed protein has the antigenicity and is a candidate gene vaccine.

Key words: Streptococcus mutans, glucan-binding protein, mammalian cells, gene expression