Abstract
Salmonella is an important foodborne pathogen, and it is unable to produce the quorum sensing signaling molecules called acyl-homoserine lactones (AHLs). However, it synthesizes the SdiA protein, detecting AHL molecules, also known as autoinducer-1 (AI-1), in the external environment. Exogenous AHLs can regulate specific genes related to virulence and stress response in Salmonella. Thus, interfering with quorum sensing can be a strategy to reduce virulence and help elucidate the cell-to-cell communication role in the pathogens' response to extracellular signals. This study aimed to evaluate the influence of the quorum sensing inhibitors furanone and phytol on phenotypes regulated by N-dodecanoyl homoserine lactone (C12-HSL) in Salmonella enterica serovar Enteritidis. The furanone C30 at 50 nM and phytol at 2 mM canceled the alterations promoted by C12-HSL on glucose consumption and the levels of free cellular thiol in Salmonella Enteritidis PT4 578 under anaerobic conditions. In silico analysis suggests that these compounds can bind to the SdiA protein of Salmonella Enteritidis and accommodate in the AHL binding pocket. Thus, furanone C30 and phytol act as antagonists of AI-1 and are likely inhibitors of the quorum sensing mechanism mediated by AHL in Salmonella.
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Acknowledgements
Erika Lorena Giraldo Vargas was supported by a fellowship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and this research has also been supported by CAPES. The authors acknowledge the CLC bio of the QIAGEN Company by the license of the CLC Drug Discovery Workbench 4.0 software.
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This work was financially supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, code 001) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).
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Erika Lorena Giraldo Vargas was responsible for conceptualization, methodology, investigation, writing, and preparing the original draft. Felipe Alves de Almeida was involved in conceptualization, investigation, writing, and reviewing. Leonardo Luiz de Freitas carried out investigation. Uelinton Manoel Pinto wrote and prepared the original draft and reviewed the manuscript. Maria Cristina Dantas Vanetti participated in conceptualization, supervision, project administration, writing-reviewing, and editing.
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Vargas, E.L.G., Almeida, F.A., de Freitas, L.L. et al. Furanone and phytol influence metabolic phenotypes regulated by acyl-homoserine lactone in Salmonella. Braz J Microbiol 53, 2133–2144 (2022). https://doi.org/10.1007/s42770-022-00809-y
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DOI: https://doi.org/10.1007/s42770-022-00809-y