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• W2232952557 abstract "Genome mining of cyslabdan-producing Streptomyces cyslabdanicus K04-0144 revealed that a set of four genes, cldA, cldB, cldC, and cldD (the cld cluster), which formed a single transcriptional unit, were involved in the biosynthesis of cyslabdan that potentiates imipenem activity against methicillin-resistant Staphylococcus aureus. Experimental studies supported the heterologous expression of the cld cluster of S. cyslabdanicus K04-0144 in S. avermitilis SUKA22, and transformants carrying the cld cluster produced not only cyslabdan A (1), but also its new derivatives, 17-hydroxyl-1 (2) and 2-hydroxyl-1 (3), in the culture broth. An analysis of diterpene metabolites in the mycelia showed that a large amount of a novel intermediate had accumulated and its structure was elucidated as (7S, 8S, 12E)-8,17-epoxy-7-hydroxylabda-12,14-diene (4). The cld-like cluster (rmn cluster) was also detected in the genome of S. anulatus GM95 by searching our in-house genome databases, and the heterologous expression of the rmn cluster in S. avermitilis SUAK22 demonstrated that the rmn cluster was involved in the biosynthesis of the labdane-type bicyclic diterpene, raimonol (7). CldA/RmnA catalyzed the generation of geranylgeranyl diphosphate (GGPP) from dimethylallyl diphosphate and isopentenyl diphosphate. CldB/RmnB converted GGPP to (+)-copalyl diphosphate, and CldD/RmnD generated labda-8(17),12(E),14-triene (5). CldC introduced two oxygen atoms at C-7 and C-8,17 to generate 4, while RmnC hydroxylated 5 at C-7 to generate 7. The heterologous expression of the cld cluster suggested that four gene products catalyzed to generate 4, but not 1. The deletion mutant of the gene encoding the mycothiol (MSH)-S-conjugate amidase (mca) of S. avermitilis SUKA22 carrying the cld cluster failed to produce 1, but accumulated 4 in the mycelia, whereas S. avermitilis SUKA22 and its mca-deletion mutant carrying the cld cluster both produced the MSH-S-conjugate of 4. The intermediate 4 was converted into the MSH-S-conjugate with MSH, which was achieved through a non-enzymatic nucleophilic reaction. The MSH-S-conjugate of 4 generated was further hydrolyzed to generate the mercapturic acid derivative, 1, by MSH-S-conjugate amidase and 1 was excreted from the mycelia." @default.
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• W2232952557 date "2016-03-01" @default.
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• W2232952557 title "Biosynthesis of mercapturic acid derivative of the labdane-type diterpene, cyslabdan that potentiates imipenem activity against methicillin-resistant <i>Staphylococcus aureus</i>: cyslabdan is generated by mycothiol-mediated xenobiotic detoxification" @default.
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• W2232952557 doi "https://doi.org/10.1007/s10295-015-1694-6" @default.
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