副溶血弧菌与肝素结合相关黏附蛋白的鉴定

Screening and identification of the heparin-binding associated adhesive proteins of Vibrio parahaemolyticus

  • 摘要: 黏附因子在病原菌的致病过程中发挥了重要作用,鉴定新的黏附因子是了解病原菌致病机制的重要手段。本研究中首次发现游离肝素能够竞争性抑制副溶血弧菌与Hela细胞的黏附,表明细胞外基质中的肝素可能是细菌重要的细胞表面黏附受体。进一步利用肝素亲和层析技术垂钓到6种副溶血弧菌的外膜蛋白,并通过基因克隆和原核表达技术成功获得重组的外膜蛋白并对其进行了深入研究。重组蛋白IMPDH、EF-Tu和OppA可黏附Hela细胞,并可以显著抑制副溶血弧菌与Hela细胞的黏附,说明这3种蛋白可能是其重要的潜在黏附因子。

     

    Abstract: Adhesins are critical to the infectious pathogens, thus identification of novel adhesins is very crucial to understanding the pathogen’s infection mechanism. In this study, we demonstrated that heparin can competitively inhibits the adhesion of Vibrio parahaemolyticus (VP) to Hela cells, which indicates heparin in ECM could be the cell receptor of VP. Using heparin-sepharose affinity chromatography, six heparin-binding VP out-membrane proteins (OMPs) are selected. The six corresponding recombinant proteins were expressed and purified. According to the result of function verification test, recombinant protein IMPDH、EF-Tu and OppA are capable of binding to the Hela cells surface. Furthermore, they can inhibit the adhesion of VP to Hela cells significantly. Our research shows that the three OMPs are candidates of VP adhesins.

     

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