Abstract
A C(19) hexaketide stilbene and a C(21) heptaketide chalcone were synthesized by Aloe arborescens octaketide synthase (OKS), a plant-specific type III polyketide synthase (PKS). Remarkably, the C(21) chalcone-forming activity was dramatically increased in a structure-guided OKS N222G mutant that produces a C(20) decaketide SEK15 from 10 molecules of malonyl-CoA. The findings suggested further strategies for production of unnatural polyketides by combination of the precursor-directed biosynthesis and the structure-guided engineering of type III PKS.
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