期刊
CHEMBIOCHEM
卷 10, 期 6, 页码 1073-1083出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.200800823
关键词
biosynthesis; methyltransferases; natural products; oxygenases; polyketides
资金
- University of Tubingen
- BMBF
- LGF Baden Wurttemberg
Polyketomycin is a tetracyclic quinone glycoside produced by Streptomyces diastatochromogenes Tu6028. It shows cytotoxic and antibiotic activity, in particular against Gram-positive multi-drug-resistant strains (for example, MRSA). The polyketomycin biosynthetic gene cluster has been sequenced and characterised. Its identity was proven by inactivation of a alpha-ketoacyl synthase gene (pokP1) of the minimal polyketide synthase II system. In order to obtain valuable information about tailoring steps, we performed further gene-inactivation experiments. The generation of mutants with deletions in oxygenase genes (pokO1, pokO2, both in parallel and pokO4) and methyltransferase genes (pokMT1, pokMT2 and pokMT3) resulted in new polyketomycin derivatives, and provided information about the organisation of the biosynthetic pathway.
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