数字农科院2.0

A Novel LysR Family Factor STM0859 is Associated with The Responses of Salmonella Typhimurium to Environmental Stress and Biofilm Formation

文献类型： 外文期刊

作者： Ma, Zhongmei;Li, Na;Ning, Chengcheng;Liu, Yucheng;Guo, Yun;Ji, Chunhui;Zhu, Xiaozhen;Meng, Qingling;Xia, Xianzhu;Zhang, Xingxing;Cai, Xuepeng;Cai, Kuojun;Jun, Qiao

作者机构：

关键词： Salmonella Typhimurium; biofilm; environmental stress; STM0859 gene

期刊名称： POLISH JOURNAL OF MICROBIOLOGY

ISSN： 1733-1331

年卷期： 2021 年 70 卷 4 期

页码：

收录情况： JCR（2021版）

摘要： Salmonella enterica subsp. enterica serovar Typhimurium (ST) is an intracellularly parasitic bacterium. This zoonotic pathogen causes food poisoning and thus imposes a severe threat to food safety. Here, to understand the regulatory roles of the novel transcription factor STM0859 on the response of ST to environmental stress and biofilm formation, the STM0859 gene-deficient strain and the complementation strain Delta STM0859/STM0859 were generated, respectively. Then, its capacity of responding to environmental stresses and biofilm (BF) formation ability under different stresses, including acid, alkali, high salt, cholate, and oxidative stresses was tested. We further analyzed the interaction between the STM0859 protein and the promoter of the acid stress response-related gene rcsB by performing an electrophoresis mobility shift assay (EMSA). The results showed that acid resistance and BF formation capacities of ST-Delta STM0859 strain were significantly weaker, as compared with those of Salmonella Typhimurium SL1344 (ST-SL1344) wild strain (p < 0.01). Quantitative qRT-PCR analysis showed that the expression levels of acid stress and BF formation-related genes, rcsB and rpoS, of ST-Delta STM0859 strain were significantly reduced at the transcription levels, while the transcription levels of these genes were fully restored in complementation strain ST-Delta STM0859/STM0859. The results of EMSA [GRAPHICS] showed that STM0859 was capable of binding the promoter DNA fragments of the rcsB gene, suggesting that STM0859 can promote the transcription of the rcsB gene through interaction with its promoter, thereby exerting an indirectly regulatory role on the adaptive responses to acid stress and BF formation of ST. This study provided new insights into the regulatory mechanisms of the LysR family factors on the tolerances of ST under adverse environmental stresses.

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