New Insights into the Glycosylation Steps in the Biosynthesis of Sch47554 and Sch47555.

Sch47554 and Sch47555 are antifungal compounds from Streptomyces sp. SCC-2136. The availability of the biosynthetic gene cluster made it possible to track genes that encode biosynthetic enzymes responsible for the structural features of these two angucyclines.

Specific 5-hydroxylation of piperlongumine by Beauveria bassiana ATCC 7159.

A new hydroxylated derivative was efficiently prepared by transforming the natural anti-cancer product, piperlongumine, with Beauveria bassiana ATCC 7159. Its structure was determined to be 5-hydroxylpiperlongumine on the basis of the spectroscopic data. The absolute configuration at C-5 was established as R by Mosher's method.