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- W2125741677 abstract "Summary Because most antibiotics are potentially lethal to the producing organism, there must be mechanisms to ensure that the machinery responsible for export of the mature antibiotic is in place at the time of biosynthesis. Simocyclinone D8 is a potent DNA gyrase inhibitor produced by Streptomyces antibioticus Tü 6040. Within the simocyclinone biosynthetic cluster are two divergently transcribed genes, simR and simX , encoding proteins that resemble the TetR/TetA repressor–efflux pump pair that cause widespread resistance to clinically important tetracyclines. Engineered expression of simX from a strong, heterologous promoter conferred high level simocyclinone D8 resistance on Streptomyces lividans , showing that simX encodes a simocyclinone efflux pump. Transcription of simX is controlled by SimR, which directly represses the simX and simR promoters by binding to two operator sites in the simX–simR intergenic region. Simocyclinone D8 abolishes DNA binding by SimR, providing a mechanism that couples the biosynthesis of simocyclinone to its export. In addition, an intermediate in the biosynthetic pathway, simocyclinone C4, which is essentially inactive as a DNA gyrase inhibitor, also induces simX expression in vivo and relieves simX repression by SimR in vitro ." @default.
- W2125741677 created "2016-06-24" @default.
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- W2125741677 date "2009-06-01" @default.
- W2125741677 modified "2023-09-30" @default.
- W2125741677 title "Coupling of the biosynthesis and export of the DNA gyrase inhibitor simocyclinone in<i>Streptomyces antibioticus</i>" @default.
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- W2125741677 doi "https://doi.org/10.1111/j.1365-2958.2009.06735.x" @default.
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