title: Improved mutasynthetic approaches for the production of modified aminocoumarin antibiotics.
abstract: This study reports improved mutasynthetic approaches for the production of aminocoumarin antibiotics. Previously, the mutasynthetic production of aminocoumarins with differently substituted benzoyl moieties was limited by the substrate specificity of the amide synthetase CloL. We expressed two amide synthetases with different substrate specificity, CouL and SimL, in appropriately engineered producer strains. After feeding of precursor analogs that were not accepted by CloL, but by SimL or CouL, a range of aminocoumarins, unattainable in our previous experiments, was produced and isolated in preparative amounts. Further, we developed a two-stage mutasynthesis procedure for the production of hybrid antibiotics that showed the substitution pattern of novobiocin in the aminocoumarin moiety and that of clorobiocin in the deoxysugar moiety. The substitution pattern of the benzoyl moiety was determined by external addition of an appropriate precursor. Twenty-five aminocoumarin compounds were prepared by these methods, and their structures were elucidated with mass and 1H-NMR spectroscopy.
authors: Pharmazeutische Biologie, Pharmazeutisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany.
authors: Christine
authors: C
authors: Anderle
authors: Susanne
authors: S
authors: Hennig
authors: Bernd
authors: B
authors: Kammerer
authors: Shu-Ming
authors: SM
authors: Li
authors: Ludger
authors: L
authors: Wessjohann
authors: Bertolt
authors: B
authors: Gust
authors: Lutz
authors: L
authors: Heide
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D003374:Coumarins / Q000737:chemistry*; D017931:DNA Primers; D008826:Microbial Sensitivity Tests; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D021241:Spectrometry, Mass, Electrospray Ionization; D013211:Staphylococcus aureus / Q000187:drug effects; D013379:Substrate Specificity
chemical_list: D000900:Anti-Bacterial Agents; D003374:Coumarins; D017931:DNA Primers