Biosynthesis of chrysomycins A and B origin of the chromophore.

Abstract
The biosynthetic origin of the C atoms in the chromophores of chrysomycins A and B was investigated in feeding experiments using 13C labeled acetates and propionate. A biosynthetic scheme is proposed involving the condensation and rearrangement of a decaketide intermediate which contains propionate (chrysomycin A) or acetate (chrysomycin B) as the chain initiator. [Streptomyces flaveolus was used.].