Kinafluorenone, a benzo[b]fluorenone isolated from the kinamycin producer Streptomyces murayamaensis
摘要:
A strain of Streptomyces murayamaensis blocked in the biosynthesis of the kinamycin antibiotics was obtained by nitrosoguanidine mutagenesis. The major colored metabolite of the mutant strain was characterized by NMR spectroscopy and X-ray crystallography as a benzo[b]fluorenone, the first of this class obtained from a natural source. A rationale is presented for kinafluorenone biogenesis and for its relationship to kinamycin biosynthesis.