sRNA STnc150 is involved in virulence regulation of Salmonella Typhimurium by targeting fimA mRNA
文献类型： 外文期刊
作者： Li, Jing 1 ; Li, Na 1 ; Ning, Chengcheng 1 ; Guo, Yun 1 ; Ji, Chunhui 1 ; Zhu, Xiaozhen 1 ; Zhang, Xingxing 2 ; Meng, Qingling 1 ; Shang, Yunxia 1 ; Xiao, Chencheng 1 ; Xia, Xianzhu 1 ; Cai, Xuepeng 3 ; Qiao, Jun 1 ;
作者机构： 1.Shihezi Univ, Coll Anim Sci & Technol, North St 4, Shihezi 832003, Xinjiang, Peoples R China
2.Xinjiang Acad Agr & Reclamat Sci, Inst Anim Sci & Vet Res, Shihezi 832000, Xinjiang, Peoples R China
3.Chinese Acad Agr Sci, Lanzhou Vet Res Inst, State Key Lab Vet Etiol Biol, Lanzhou 730046, Gansu, Peoples R China
关键词： STnc150; virulence regulation; Salmonella typhimurium; fimA mRNA
期刊名称：FEMS MICROBIOLOGY LETTERS （ 影响因子：2.82； 五年影响因子：3.248 ）
ISSN： 0378-1097
年卷期： 2021 年 368 卷 18 期
页码：
收录情况： SCI
摘要： Small RNAs (sRNAs) are essential virulent regulators in Salmonella typhimurium (STM). To explore the role of sRNA STnc150 in regulating STM virulence, we constructed a STnc150 deletion strain (Delta STnc150) and its complementary strain (Delta STnc150/C). Then, we compared their characteristics to their original parent strain experimentally, identified the target genes of STnc150 and determined the expression levels of target genes. The results showed that the Delta STnc150 strain exhibited delayed biofilm formation, enhanced adhesion to macrophages, significantly reduced LD50, increased liver and spleen viral loads and more vital pathological damaging ability than its parent and complementary strains. Further, bioinformatics combined with the bacterial dual plasmid reporter system confirmed that the bases 72-88 of STnc150 locating at the secondary stem-loop structure of the STnc150 are complementary with the bases 1-19 in the 5'-terminal of fimA mRNA of the type 1 fimbriae subunit. Western blot analysis showed that fimA protein level was increased in STnc150 strain compared with its parent and complementary strains. Together, this study suggested that STnc150 can down-regulate STM fimA expression at the translation level, which provided insights into the regulatory mechanisms of sRNAs in virulence of STM.
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