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Updated: Dec 15, 2025

Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds
Published on: August 8, 2025
Amicoumacins from a desert bacterium: quorum sensing inhibitor against Chromobacterium violaceum
Wen-Pan Shi1, Hong Zeng1, Chuan-Xing Wan1
1Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alaer, P. R. China.
Abstract:
In our study, the anti-quorum sensing (QS) activity of fermentation broth from TRM B-02, a bacterium isolated from Taklimakan desert, was investigated using the biosensor bioassay on Chromobacterium violaceum ATCC12472. TRM B-02 was 100% similar to Bacillus subtilis subsp. Inaquosorum KCTC 13429(T) by genotypic and phenotypic analyses. Based on anti-QS activity tracking, six known amicoumacins, named as AI-77-H (1), AI-77-F (2), amicoumacin B (3), amicoumacin C (4), AI-77-C (5) and bacilosarcins D (6), were isolated and identified. Among them, compounds 1-3 exhibited a better inhibitory effect on C. violaceum ATCC12472. Further research suggested that compounds 1-3 could significantly down-regulate the expressions of violacein operon A (vioA), vioB, vioD and vioE and up-regulate vioC. Docking experiments indicated that compounds 1-3 may act as an inhibitor of violacein biosynthetic pathway competitively inhibiting the binding of flavin adenine dinucleotide (FAD) with the vioD enzyme.[Figure: see text].
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