In vivo and in vitro reconstitution of unique key steps in cystobactamid antibiotic biosynthesis.
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Issue Date
2021-03-16
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Show full item recordAbstract
Cystobactamids are myxobacteria-derived topoisomerase inhibitors with potent anti-Gram-negative activity. They are formed by a non-ribosomal peptide synthetase (NRPS) and consist of tailored para-aminobenzoic acids, connected by a unique α-methoxy-L-isoasparagine or a β-methoxy-L-asparagine linker moiety. We describe the heterologous expression of the cystobactamid biosynthetic gene cluster (BGC) in Myxococcus xanthus. Targeted gene deletions produce several unnatural cystobactamids. Using in vitro experiments, we reconstitute the key biosynthetic steps of linker formation and shuttling via CysB to the NRPS. The biosynthetic logic involves a previously uncharacterized bifunctional domain found in the stand-alone NRPS module CysH, albicidin biosynthesis and numerous BGCs of unknown natural products. This domain performs either an aminomutase (AM) or an amide dehydratase (DH) type of reaction, depending on the activity of CysJ which hydroxylates CysH-bound L-asparagine. Furthermore, CysQ O-methylates hydroxyl-L-(iso)asparagine only in the presence of the AMDH domain. Taken together, these findings provide direct evidence for unique steps in cystobactamid biosynthesis.Citation
Nat Commun. 2021 Mar 16;12(1):1696. doi: 10.1038/s41467-021-21848-3.Affiliation
HIPS, Helmholtz-Institut für Pharmazeutische Forschung Saarland, Universitätscampus E8.1 66123 Saarbrücken, Germany.Publisher
Nature ResearchJournal
Nature communicationsPubMed ID
33727542Type
ArticleLanguage
enEISSN
2041-1723ae974a485f413a2113503eed53cd6c53
10.1038/s41467-021-21848-3
Scopus Count
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- Creative Commons
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