Virulence regulation of cel-EIIB protein mediated PTS system in Streptococcus agalactiae in Nile tilapia

文献类型： 外文期刊

第一作者： Xu, Jun

作者： Xu, Jun;Liu, Ling;Guo, Song;Li, An-Xing;Su, You-Lu;Xie, Yun-Dan

作者机构：

关键词： biofilm formation; cel-EIIB protein; colonization; Streptococcus agalactiae; virulence regulation

期刊名称：JOURNAL OF FISH DISEASES （ 影响因子：2.767； 五年影响因子：2.689 ）

ISSN： 0140-7775

年卷期： 2019 年 42 卷 1 期

页码：

收录情况： SCI

摘要： Streptococcus agalactiae is a major pathogen of tilapia causing significant economic losses for the global aquatic industry yearly. To elucidate the role of cel-EIIB protein-mediated phosphotransferase systems (PTS) in the virulence regulation of S. agalactiae, cel-EIIB gene deletion in a virulent strain THN0901 was achieved by homologous recombination. The cellobiose utilization of ocel-EIIB strain was significantly decreased relative to S.a.THN0901 strain incubating in LB with 10 mg/ml cellobiose (p < 0.05). The biofilm formation ability of ocel-EIIB strain was also significantly decreased when cultured in BHI medium (p < 0.05). Under a lower infection dose, the accumulative mortality of tilapia caused by ocel-EIIB strain was dramatically decreased (20%), of which S.a.THN0901 strain and ocel-EIIB::i strain were 53.33% and 50%, respectively. The competition experience using tilapia model indicated the invasion and colonization ability of ocel-EIIB strain was significantly weaker than that of S.a.THN0901 strain (p < 0.05). Compared to ocel-EIIB::i strain, the mRNA expression of csrS, csrR, rgfA, rgfC, bgrR and bgrS was significantly downregulated in ocel-EIIB strain (p < 0.05). In conclusion, cel-EIIB protein-mediated cel-PTS not only contributes to biofilm formation and virulence regulation, but also plays an important role in the invasion and colonization of S. agalactiae.

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