Resorculins: hybrid polyketide macrolides from Streptomyces sp. MST-91080
Heather J Lacey1,2, Rachel Chen1, Daniel Vuong1
1Microbial Screening Technologies, Smithfield, NSW 2164, Australia.
Abstract:
Fourteen-membered macrolides are a class of compounds with significant clinical value as antibacterial agents. As part of our ongoing investigation into the metabolites of Streptomyces sp. MST-91080, we report the discovery of resorculins A and B, unprecedented 3,5-dihydroxybenzoic acid (α-resorcylic acid)-containing 14-membered macrolides. We sequenced the genome of MST-91080 and identified the putative resorculin biosynthetic gene cluster (rsn BGC). The rsn BGC is hybrid of type I and type III polyketide synthases. Bioinformatic analysis revealed that the resorculins are relatives of known hybrid polyketides: kendomycin and venemycin. Resorculin A exhibited antibacterial activity against Bacillus subtilis (MIC 19.8 μg mL-1), while resorculin B showed cytotoxic activity against the NS-1 mouse myeloma cell line (IC50 3.6 μg mL-1).
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