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. Author manuscript; available in PMC: 2020 Feb 6.
Published in final edited form as: J Am Chem Soc. 2019 Jan 24;141(5):1961–1969. doi: 10.1021/jacs.8b10521

Scheme 2.

Scheme 2.

Single module extender unit competition assay. The fusion protein PikAIIITE or the final module of the DEBS PKS, Ery6TE, are incubated with the synthetic pentaketide chain mimic 10 and a mixture of the native extender 8 and an equimolar amount of 9a in vitro. NADPH was produced in situ with an NADPH regeneration system. Error was ± 5% of indicated value. Percentages are shown for wild-type systems.