河南农业科学 ›› 2024, Vol. 53 ›› Issue (2): 136-143.DOI: 10.15933/j.cnki.1004-3268.2024.02.015

• 畜牧·兽医 • 上一篇    下一篇

嗜水气单胞菌外膜蛋白TolB 的原核表达及生物信息学分析

陈甜梦,蔡彤璇,王嘉璐,田牧野,赵宝华,刘东   

  1. (河北师范大学生命科学学院,河北 石家庄 050024)
  • 收稿日期:2023-06-15 出版日期:2024-02-15 发布日期:2024-03-20
  • 通讯作者: 刘东(1981-),男,河北石家庄人,副教授,博士,主要从事微生物分子酶学方面研究。E-mail:pqw1234@163.com
  • 作者简介:陈甜梦(2000-),女,河北石家庄人,在读硕士研究生,研究方向:微生物生物化学。E-mail:15076303175@163.com
  • 基金资助:
    河北省自然科学基金项目(C2019205044);河北省高等学校科学技术研究项目(ZD2018070);河北省教育厅优秀青年基金
    项目(YQ2014026);河北师范大学重点基金项目(L2016Z03)

Expression and Bioinformatics Analysis of Aeromonas hydrophila Outer Membrane TolB Protein

CHEN Tianmeng,CAI Tongxuan,WANG Jialu,TIAN Muye,ZHAO Baohua,LIU Dong   

  1. (College of Life Science,Hebei Normal University,Shijiazhuang 050024,China)
  • Received:2023-06-15 Published:2024-02-15 Online:2024-03-20

摘要: 为筛选TolB作为嗜水气单胞菌(Aeromonas hydrophila)渔用疫苗候选抗原,从嗜水气单胞菌中克隆了外膜蛋白tolB 基因并异源表达,采用生物信息学方法预测TolB的理化性质和结构特征。结果显示,tolB 基因片段(去除信号肽)全长1 263 bp,编码1条含有420个氨基酸残基的多肽,分子质量45.78 ku。成功在大肠杆菌E.coli BL21(DE3)中异源表达TolB蛋白,其为稳定的亲水性外膜蛋白。TolB蛋白家族在不同菌株间具有同源性,尤其在气单胞菌间亲缘关系更近。TolB蛋白二级结构以无规则卷曲为主,具有潜在的B细胞、细胞毒性T淋巴细胞(CTL)和辅助T细胞(Th)抗原表位;相互作用网络主要为Tol-Pal系统蛋白。综上,TolB具有成为嗜水气单胞菌亚单位疫苗有效候选抗原的特性。

关键词: 嗜水气单胞菌, TolB, 原核表达, 蛋白质纯化, 生物信息学

Abstract: The purpose of this study is to evaluate the application of TolB as the candidate vaccine antigen to prevent Aeromonas hydrophila infection in fish.Outer membrane protein gene tolB from A.hydrophila was cloned and expressed in Escherichia coli BL21(DE3). Physicochemical properties and advanced structures of TolB protein were analyzed by bioinformatics.The results indicated that tolB gene had an open reading frame of 1 263 bp(exclude signal peptide),encoding a protein(TolB)of 420 amino acids with molecular mass of 45.78 ku.TolB was successfully expressed and purified from Escherichia coli BL21(DE3).TolB was a stable and hydrophilic outer membrane protein.TolB had homology among different bacteria,and was more closely related in Aeromonas.The secondary structure of TolB was dominated by random coil.TolB had potential B,CTL and Th cell antigen epitopes and interacted with other Tol⁃Pal system proteins.In conclusion,TolB could be used as an effective vaccine candidate antigen agaisnt A.hydrophila.

Key words: Aeromonas hydrophila, TolB, Prokaryotic expression, Protein purification, Bioinformatics

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