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Co-regulation of CodY and (p)ppGpp synthetases on morphology and pathogenesis of Streptococcus suis

文献类型： 外文期刊

作者： Zhu, Jiawen 1 ; Zhang, Tengfei 1 ; Su, Zhipeng 1 ; Feng, Liping 1 ; Liu, Hanyang 2 ; Xu, Zhenying 2 ; Wu, Yongsheng 2 ; G 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Vet Med, State Key Lab Agr Microbiol, Wuhan 430070, Peoples R China

2.Chengdu Acad Agr & Forestry Sci, Inst Anim Sci, Chengdu 611130, Peoples R China

3.Hubei Acad Agr Sci, Inst Anim & Vet Sci, Key Lab Prevent & Control Agents Anim Bacteriosis, Wuhan 430064, Peoples R China

4.Sichuan Dekang Husb Sci & Technol Co Ltd, Chengdu 610200, Peoples R China

5.Cooperat Innovat Ctr Sustainable Pig Prod, Wuhan 430070, Peoples R China

6.Anim Res Ctr, Shanghai Lab, Shanghai 201203, Peoples R China

7.China Minist Sci & Technol, Int Res Ctr Anim Dis, Wuhan 430070, Peoples R China

关键词： CodY; (p)ppGpp synthetase; Morphology; Pathogenesis; Streptococcus suis

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：5.415； 五年影响因子：6.038 ）

ISSN： 0944-5013

年卷期： 2019 年 223 卷

页码：

收录情况： SCI

摘要： CodY and (p)ppGpp synthetases are two important global regulators of bacteria. In some pathogens, such as Listeria monocytogenes, the GTP pool links these two regulatory systems, and introducing a codY mutant into the Delta relA strain restored the pathogenicity of the attenuated Delta relA mutant. In previous studies, we identified the (p) ppGpp synthetases (RelA and RelQ) and CodY of Streptococcus suis. To understand the interrelationships between these two regulators in S. suis, a Delta relA Delta relQ Delta codY mutant was constructed, and its growth, morphology, and pathogenicity were evaluated. Compared with Delta relA Delta relQ, Delta codY, its growth was very slow, but its chain length was partly restored to the wild-type length and its capsule became thick and rough. The adherence, invasion ability, and resistance to whole-blood killing in vitro of Delta relA Delta relQ Delta codY and its lethality and colonization ability in mice were clearly reduced, which differs from the effects of these mutations in L. monocytogenes. An analysis of gene expression showed that CodY interacted with the relA promoter in a GTP-independent manner to positively regulate the expression of relA. The introduction of a codY mutant into the Delta relA Delta relQ strain further reduced the expression of virulence factors, which suggests a novel interaction between the (p)ppGpp synthetases and CodY. This study extends our understanding of the relationship between the (p)ppGpp-mediated stringent response and the regulation of CodY in S. suis.

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