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Identification of novel genes associated with anti-phagocytic functions in Streptococcus equi subsp. zooepidemicus

文献类型： 外文期刊

作者： Xu, Bin 2 ; Zhang, Ping 1 ; Zhou, Hong 1 ; Sun, Yu 1 ; Tang, Jinsheng 1 ; Fan, Hongjie 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Vet Med, MOE Joint Int Res Lab Anim Hlth & Food Safety, Nanjing, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Vet Med, Natl Res Ctr Vet Biol Engn & Technol, Nanjing, Jiangsu, Peoples R China

3.Chinese Acad Agr Sci, Poultry Inst, Yangzhou, Jiangsu, Peoples R China

4.Jiangsu Coinnovat Ctr Prevent & Control Important, Yangzhou, Jiangsu, Peoples R China

关键词： Streptococcus equi subsp. zooepidemicus; Insertion mutation; Anti-phagocytosis; Secreted enzymes

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）

ISSN： 0378-1135

年卷期： 2019 年 233 卷

页码：

收录情况： SCI

摘要： The anti-phagocytic abilities of bacteria often affect bacterial pathogenicity. Here, random mutant library of Streptococcus equi subsp. zooepidemicus (SEZ) was constructed using transposon mutagenesis. After careful screening, 30 transposon mutants with different transposon insertion sites were identified by conducting, quantitative phagocytosis and insertion-site confirmation assays, whose anti-phagocytic abilities were significantly reduced relative to the wild-type strain. Insertion sites of 19 strains were monocistronic, including genes coding membrane proteins, transporters, and enzymes with unknown pathological function, such as sadM, adhP, purD, guaA, alpha-galactosidase coding gene, ABC transporter permease coding gene, metallo-beta-lac-tamase coding gene, and three secreted enzyme coding genes spuZ, slaB, and endoS, as well as known virulence, factor coding genes, such as hasA and szM. The insertion sites of another 11 strains were polycistronic. We focused on four monocistronic-mutant strains: MhtpZ, MspuZ, MslaB, and MendoS. The anti-phagocytic abilities, of not only the mutants that were precoincubated with the recombinant proteins, but also the complement strains were significantly more pronounced than those of all four corresponding mutants. The polyclonal serum against SlaB or EndoS also significantly decreased the anti-phagocytic capacity of wild-type SEZ. All four mutants exhibited significantly decreased viability in whole blood and reduced lethality in mice relative to the, wild-type strain. Thus, we identified a variety of new anti-phagocytic factors, particularly multiple SEZ secreted enzymes. These factors are instrumental in the phagocytic resistance of SEZ in the absence of opsonin. Our, results provide a framework for further studies of SEZ pathogenesis and relevant vaccine development for novel potential targets.

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