Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (12): 5207-5217.doi: 10.11843/j.issn.0366-6964.2023.12.030

• BASIC VETERINARY MEDICINE • Previous Articles     Next Articles

Regulatory Role of STM1827 in the Biofilm Formation and Environmental Stress of Salmonella Typhimurium

LI Lili1, CHEN Kaifeng1, CHEN Bing2, ZHOU Zhouping1, WANG Nanwei1, QU Xiaoyun1, XU Chenggang1, LIAO Ming1,3, ZHANG Jianmin1*   

  1. 1. Key Laboratory of Veterinary Vaccine Creation of Ministry of Agriculture, Key Laboratory of Zoonotic Diseases, Guangdong Key Laboratory of Zoonotic Diseases of Animal Origin, National Joint Engineering Laboratory of Zoonotic and Disease Control Agents, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China;
    2. Shenzhen Customs Animal and Plant Inspection and Quarantine Technology Center, Shenzhen 518045, China;
    3. Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
  • Received:2023-04-24 Online:2023-12-23 Published:2023-12-26

Abstract: The aim was to study the regulation of the c-di-GMP pathway metabolic gene STM1827 on the biofilm of Salmonella Typhimurium and its related biological functions. Firstly, we analyzed the effect of STM1827 on the content of c-di-GMP by measuring the level of c-di-GMP; Further analyzed the effect of STM1827 on biofilm formation through experiments such as biofilm and motility; Finally, the effects of STM1827 on the adaptability of Salmonella Typhimurium to environmental stress were analyzed through experiments such as oxygen stress and disinfectant stress. The results showed that the intracellular c-di-GMP level of the mutant strain 269ΔSTM1827 was 33.16% higher than that of wild strain. In terms of biofilm formation, compared with the wild strain, the mutant strain 269ΔSTM1827 had a 2.19-fold increase in the ability of biofilm formation, a 1.3-fold increase in the content of biofilm related extracellular polysaccharide, and a significant increase in the expression of extracellular polysaccharide synthesis genes (P<0.000 1). In terms of motility, the motility of 269ΔSTM1827 was decreased by 13%, and the expression of flagella-related genes was significantly decreased (P<0.05). And STM1827 gene mutant enhanced the adaptive ability of Salmonella Typhimurium under oxygen stress and disinfectant stress. The study showed that STM1827 can degrade c-di-GMP, inhibit the formation of biofilm by inhibiting the synthesis of extracellular polysaccharide and promoting bacterial motility, and ultimately lead to the decrease of bacterial tolerance under oxygen and disinfectant stress. This study provides a theoretical basis for the screening of salmonellosis targets and the development of prevention and control measures.

Key words: Salmonella Typhimurium, c-di-GMP, STM1827, biofilm, motility, adapting

CLC Number: