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Quorum sensing inhibition and tobramycin acceleration in Chromobacterium violaceum by two natural cinnamic acid derivatives

  • Applied microbial and cell physiology
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Abstract

Chromobacterium violaceum, one free-living Gram-negative bacterium, is abundantly presented in tropics and sub-tropics soil and aquatic environment; it is also an opportunistic human pathogen. Here, two cinnamic acid derivatives, i.e., 4-dimethylaminocinnamic acid (DCA) and 4-methoxycinnamic acid (MCA), were identified as potential quorum sensing (QS) and biofilm inhibitors in C. violaceum ATCC12472. Both DCA (100 μg/mL) and MCA (200 μg/mL) inhibited the levels of N-decanoyl-homoserine lactone (C10-HSL) and reduced the production of certain virulence factors in C. violaceum, including violacein, hemolysin, and chitinase. Metabolomics analysis indicated that QS-related metabolites, such as ethanolamine and L-methionine, were down-regulated after treatment with DCA and MCA. Quantitative real-time polymerase chain reaction (qRT-PCR) demonstrated that DCA and MCA markedly suppressed the expression of two QS-related genes (cviI and cviR). In addition, DCA and MCA also inhibited biofilm formation and enhanced the susceptibility of biofilms to tobramycin, which was evidenced by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). Our results indicated that DCA and MCA can serve as QS-based agent for controlling pathogens.

Key Points

DCA and MCA inhibited QS and biofilm formation in C. violaceum.

• The combination of DCA or MCA and tobramycin removed the preformed biofilm of C. violaceum.

DCA or MCA inhibited virulence factors and expressions of cviI and cviR of C. violaceum.

DCA or MCA are potential antibiotic accelerants for treating C. violaceum infection.

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Funding

This study was funded by the National Key Research and Development Program of China (2017YFD0201401), National Natural Science Foundation of China (41766006), and Six Talent Peaks Project in Jiangsu Province.

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Contributions

AQJ and JWZ conceived and designed research. AQJ and JWZ conducted experiments. WJC, PPZ, and HZL performed the experiments. WJC and AQJ wrote the paper. ST, JJL, and SMD provided technical supports. AQJ, WJC, and HZL analyzed data. All authors read and approved the paper.

Corresponding authors

Correspondence to Jin-Wei Zhou or Ai-Qun Jia.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Cheng, WJ., Zhou, JW., Zhang, PP. et al. Quorum sensing inhibition and tobramycin acceleration in Chromobacterium violaceum by two natural cinnamic acid derivatives. Appl Microbiol Biotechnol 104, 5025–5037 (2020). https://doi.org/10.1007/s00253-020-10593-0

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  • DOI: https://doi.org/10.1007/s00253-020-10593-0

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