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A silent dibenzoxazepinone (DBP) biosynthetic gene cluster ( myc) was mutagenically activated in Streptomyces olivaceus SCSIO T05, enabling the discovery of mycemycin C (4) and three new analogues [mycemycins F-H (1-3)]. Gene disruption, complementation experiments, and enzymatic assays unveiled salicylic acid and 5-Cl-kynurenine as biosynthetic precursors and shed significant functional insights into MycO, MycB, MycR, and MycJ, enzymes responsible for fine-tuning of the DBP scaffold.
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Zhang et al. (2018) studied this question.
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