Mn uptake system affects the virulence of Streptococcus suis by mediating oxidative stress

文献类型： 外文期刊

第一作者： Peng, Wei

作者： Peng, Wei;Yang, Xia;Wang, Yanna;Wang, Ningning;Li, Xiaoyue;Chen, Huanchun;Yuan, Fangyan;Bei, Weicheng;Bei, Weicheng;Yuan, Fangyan;Peng, Wei;Yang, Xia;Wang, Yanna;Wang, Ningning;Li, Xiaoyue;Chen, Huanchun;Bei, Weicheng;Bei, Weicheng

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关键词： Streptococcus suis; Mn uptake system; TroABCD; Oxidative stress; Virulence

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.246； 五年影响因子：3.565 ）

ISSN： 0378-1135

年卷期： 2022 年 272 卷

页码：

收录情况： SCI

摘要： Manganese (Mn) is an important micronutrient that is not readily available to pathogens during infection. Hosts resist the invasion of pathogens through nutritional immunity and oxidative stress. To overcome this nutrient restriction, bacteria utilize high affinity transporters to compete with nutrient-binding proteins (e.g., calpro-tectin). Little is known about the role of Mn in the pathophysiology of Streptococcus suis. Here, we revealed that the tolerance of S. suis to calprotectin and oxidative stress was associated with Mn. Inactivation of Mn uptake system, TroABCD, in S. suis decreased the tolerance to calprotectin and oxidative stress. Furthermore, Mn uptake system mutant strains reduced capacity for bacterial cellular survival, and attenuated virulence in a mouse model. To explore the regulatory mechanism, we determined the transcriptional start site of troABCD using capping rapid amplification of cDNA ends. Furthermore, we revealed that TroR was a transcriptional regulatory repressor of troABCD. In the absence of troR , transcription levels of troA , troB , troC , and troD were not inhibited by low or high Mn levels, and intracellular Mn contents of mutant strains were higher than that of the wild-type strain. Finally, we used electrophoretic mobility shift assay to demonstrate that TroR bound the promoter region of troABCD. Collectively, this study revealed that Mn acquisition was essential for pathogenesis of S. suis and Mn uptake systems should be targets for the development of new antimicrobials.

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