Sequence analysis of ketosynthase domain amplicons from Streptomyces bicolor NBRC 12746T revealed the presence of previously unreported type I polyketide synthases (PKS-I) genes. The clustering of these genes with the reference PKS-1 sequences suggested the possibility to produce a polyene compound similar to pimaricin. Thus, the cultured sample from NBRC 12746T was analyzed for the production of polyene compounds. The strain produced an antifungal compound which displayed the UV absorption spectrum of tetraene macrolides. The structure determination based on the spectroscopic analysis of the purified compound resulted in the identification of a novel pimaricin analog JBIR-13 (1). This study therefore strongly suggested that a careful analysis of PKS-I genes can provide valuable information in the search of novel bioactive compounds within a class predicted from phylogenetic analysis.
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We are grateful to Dr. Tetsuo Suemoto, Ms. Natsumi Kuwahara, and Ms. Rieko Suzuki for their technical assistance. This work was supported by the grant from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.
H. Komaki and M. Izumikawa contributed equally to this work.
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Komaki, H., Izumikawa, M., Ueda, J. et al. Discovery of a pimaricin analog JBIR-13, from Streptomyces bicolor NBRC 12746 as predicted by sequence analysis of type I polyketide synthase gene. Appl Microbiol Biotechnol 83, 127–133 (2009). https://doi.org/10.1007/s00253-008-1849-8
- Type I polyketide synthase
- Streptomyces bicolor
- Polyene macrolide