Abstract
Formicamycins and their biosynthetic intermediates the fasamycins are polyketide antibiotics produced by Streptomyces formicae KY5 from a pathway encoded by the for biosynthetic gene cluster. In this work the ability of Streptomyces coelicolor M1146 and the ability of Saccharopolyspora erythraea Δery to heterologously express the for biosynthetic gene cluster were assessed. This led to the identification of eight new glycosylated fasamycins modified at different phenolic groups with either a monosaccharide (glucose, galactose, or glucuronic acid) or a disaccharide comprised of a proximal hexose (either glucose or galactose), with a terminal pentose (arabinose) moiety. In contrast to the respective aglycones, minimal inhibitory screening assays showed these glycosylated congeners lacked antibacterial activity.
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