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AI 77B is a pseudopeptide microbial agent with gastroprotective action.

Amicoumacin B can be produced by actinomycete, strain 04-5195T.. Amicoumacin B increases the expression of bone morphogenetic protein 2 (BMP-2). Amicoumacin B has inhibitory effect against C. violaceum (MIC = 250 μg/mL). Amicoumacin B has quorum sensing inhibitory activity, and reduces the expression of the C. violaceum operons vioA, vioB, vioD, and vioE, but increases the expression of vioC[1][2].

[1] Shi WP, et al. Amicoumacins from a desert bacterium: quorum sensing inhibitor against Chromobacterium violaceum. Nat Prod Res. 2021 Dec;35(23):5508-5512. DOI:10.1080/14786419.2020.1788554
[2] Sun W, et al. Nocardia jinanensis sp. nov., an amicoumacin B-producing actinomycete. Int J Syst Evol Microbiol. 2009 Feb;59(Pt 2):417-20. DOI:10.1099/ijs.0.002899-0