KirCII- promising tool for polyketide diversification

Ewa Maria Musiol-Kroll, Thomas Härtner, Andreas Kulik, Wolfgang Wohlleben, Tilmann Weber, Sang Yup Lee

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review


Kirromycin is produced by Streptomyces collinus Tü 365. This compound is synthesized by a large assembly line of type I polyketide synthases and non-ribosomal peptide synthetases (PKS I/NRPS), encoded by the genes kirAI-kirAVI and kirB. The PKSs KirAI-KirAV have no acyltransferase domains integrated into the PKS modules. This type of PKS is named trans-AT-PKS. The KirAVI belongs to the classical cis-AT-type PKS, where the ATs are part of the PKS protein. In the gene cluster of kirromycin two separate AT-like genes, kirCI and kirCII, were identified. The proteins KirCI and KirCII were characterized by genetic and biochemical approaches. While KirCI is a malonyl-CoA specific AT and loads malonate on the assembly line, the discrete AT KirCII is introducing ethylmalonate into the kirromycin structure. Recently, the substrate preference of KirCII was described (1-3). In vitro assays showed that besides ethylmalonyl-CoA, KirCII accepts other non-malonyl-CoA substrates (e.g. allylmalonyl-CoA or propagylmalonyl-CoA). Feeding of the kirromycin producer strain carrying a Co-A-synthetase led to the production of kirromycin derivatives: allyl- and propagyl-kirromycin and demonstrate that KirCII is also introducing the non-native substrates in an in vivo context. Thus, KirCII represents a promising tool for polyketide diversification.
Original languageEnglish
Title of host publicationAbstract Book - DTU Sustain Conference 2014
Number of pages1
Place of PublicationKgs. Lyngby
PublisherTechnical University of Denmark
Publication date2014
Publication statusPublished - 2014
EventDTU Sustain Conference 2014 - Technical University of Denmark, Lyngby, Denmark
Duration: 17 Dec 201417 Dec 2014


ConferenceDTU Sustain Conference 2014
LocationTechnical University of Denmark
Internet address


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