Engineered P450 BM3 and cpADH5 coupled cascade reaction for β-oxo fatty acid methyl ester production in whole cells

Enzyme and Microbial Technology
Yunus EnsariUlrich Schwaneberg

Abstract

Hydroxy- or ketone- functionalized fatty acid methyl esters (FAMEs) are important compounds for production of pharmaceuticals, vitamins, cosmetics or dietary supplements. Biocatalysis through enzymatic cascades has drawn attention to the efficient, sustainable, and greener synthetic processes. Furthermore, whole cell catalysts offer important advantages such as cofactor regeneration by cell metabolism, omission of protein purification steps and increased enzyme stability. Here, we report the first whole cell catalysis employing an engineered P450 BM3 variant and cpADH5 coupled cascade reaction for the biosynthesis of hydroxy- and keto-FAMEs. Firstly, P450 BM3 was engineered through the KnowVolution approach yielding P450 BM3 variant YE_M1_2, (R47S/Y51W/T235S/N239R/I401 M) which exhibited boosted performance toward methyl hexanoate. The initial oxidation rate of YE_M1_2 toward methyl hexanoate was determined to be 23-fold higher than the wild type enzyme and a 1.5-fold increase in methyl 3-hydroxyhexanoate production was obtained (YE_M1_2; 2.75 mM and WT; 1.8 mM). Subsequently, the whole cell catalyst for the synthesis of methyl 3-hydroxyhexanoate and methyl 3-oxohexanoate was constructed by combining the engineered P450 BM3 and...Continue Reading

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Dec 18, 2020·Chemical Communications : Chem Comm·Ansgar BokelVlada B Urlacher

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