Amicoumacins from a desert bacterium: quorum sensing inhibitor against Chromobacterium violaceum.

Wen-Pan Shi, Hong Zeng, Chuan-Xing Wan, Zhong-Bo Zhou

Natural product research 2021 Dec

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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].

Citation

Wen-Pan Shi, Hong Zeng, Chuan-Xing Wan, Zhong-Bo Zhou. Amicoumacins from a desert bacterium: quorum sensing inhibitor against Chromobacterium violaceum. Natural product research. 2021 Dec;35(23):5508-5512