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Anti-quorum sensing activity of Forsythia suspense extract against Chromobacterium violaceum by targeting CviR receptor

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Abstract

The increasing incidence of antimicrobial-resistant bacterial pathogens has focused researchers on quorum sensing inhibition strategies instead of those conventional approaches to fight bacterial infections. Anti-quorum sensing (QS) activity of aqueous extract from Forsythia suspense (FSE) was assessed, and its potential QS inhibition mechanisms were also analyzed. The minimal inhibitory concentration (MIC) of FSE to Chromobacterium violaceum 12472 is 0.5 mg mL−1. Inhibition of QS-regulated violacein production and biofilm formation in C. violaceum 12472 by FSE occurred in a concentration-dependent manner at sub-MIC, with > 70.12 and > 85.31% inhibition at 0.25 mg mL−1, respectively. N-Acyl homoserine lactones (AHLs) extracted from cultures of C. violaceum 31532 grown in the presence of FSE could not change the violacein production in C. violaceum 026, which indicated that FSE did not inhibit AHL synthesis. We also found that FSE cannot degrade AHLs. Finally, in silico molecular docking was conducted. The computed binding energy data suggested that components of F. suspense have a tendency to inhibit CviR with varying binding affinities and the energy score of Pinoresinol (− 26.02 kcal/mol) is higher than that of C6-HSL (− 16.09 kcal mol−1). We concluded that FSE acts as an antagonist of bacterial quorum sensing by competing with AHL receptor binding site.

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Acknowledgments

This work was financed by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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  1. Department of Pharmaceutical Microbiology, School of Life Science and Technology, China Pharmaceutical University, Nanjing, 210009, China

    Xiyi Zhuang, An Zhang & Weihua Chu

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  1. Xiyi Zhuang
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Zhuang, X., Zhang, A. & Chu, W. Anti-quorum sensing activity of Forsythia suspense extract against Chromobacterium violaceum by targeting CviR receptor. Int Microbiol 23, 215–224 (2020). https://doi.org/10.1007/s10123-019-00091-3

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