STnc1280, a trans- coding sRNA is involved in virulence modulation via targeting gldA mRNA in Salmonella Typhimurium

文献类型： 外文期刊

第一作者： Ning, Chengcheng

作者： Ning, Chengcheng;Li, Na;Wang, Lixia;Guo, Yun;Ji, Chunhui;Li, Zhiyuan;Shang, Yunxia;Sun, Yaoqiang;Huang, Xiaoxing;Leng, Qingwen;Meng, Qingling;Qiao, Jun;Ning, Chengcheng;Zhang, Xingxing;Cai, Xuepeng

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关键词： modulation; Salmonella Typhimurium; sRNA; STnc1280; virulence

期刊名称：JOURNAL OF MEDICAL MICROBIOLOGY （ 影响因子：3.0； 五年影响因子：2.7 ）

ISSN： 0022-2615

年卷期： 2024 年 73 卷 2 期

页码：

收录情况： SCI

摘要： Introduction. Salmonella Typhimurium (STM) is a food - borne Gram- negative bacterium, which can infect humans and a wide range of livestock and poultry, causing a variety of diseases such as septicaemia, enteritis and abortion. Hypothesis/Gap Statement. We will decipher the impacts of sRNA STnc1280 on STM virulence and provide a theoretical basis to reveal the regulatory role and molecular mechanism of STnc1280. Aim. The main objective of this study was to clarify whether sRNA STnc1280 exerts regulatory roles on STM pathogenicity. Methodology. The STnc1280 gene was amplified and its molecular characteristics were analysed in this study. Then, STnc1280 gene deletion strain (STM-Delta STnc1280) and the complementary strain (Delta STnc1280/STnc1280) were constructed by lambda-Red homologous recombination method, respectively, to analyse of adhesion and invasive ability and pathogenicity of different strains. Subsequently, the potential target gene regulated by STnc1280 was predicted using target RNA2 software, followed by the verification of the interaction between STnc1280 and target mRNA using the dual plasmid reporter system (DPRS). Furthermore, the mRNA and protein level of target gene was determined using qRT-PCR and Western blot, respectively. Results. The results revealed that the cell adhesion and invasive ability and pathogenicity of STM-Delta STnc1280 were significantly reduced compared to STM- SL1344 strain, indicating that the deficiency of STnc1280 gene significantly influenced STM pathogenicity. The DPRS results showed that STnc1280 can interact with the mRNA of target gene gldA, thus suppressing the expression of lacZ gene. Furthermore, the level of gldA mRNA was not influenced in STM-Delta STnc1280, but the expression of GldA protein decreased significantly. Conclusion. Combining the bioinformatic analysis, these findings suggested that STnc1280 may bind to the SD sequence of gldA mRNA, hindering the binding of ribosomes to gldA mRNA, thereby inhibiting the expression of GldA protein to modulate the virulence of STM.

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