Three-steps in one-pot: whole-cell biocatalytic synthesis of enantiopure (+)- and (−)-pinoresinol via kinetic resolution

Microbial Cell Factories

Research

Vlada B. Urlacher¹  Esther Ricklefs¹  Marco Girhard¹ 

[1] Institute of Biochemistry, Heinrich-Heine University, Universitätsstraße 1, 40225, Düsseldorf, Germany;

关键词: Laccase;    Vanillyl-alcohol oxidase;    Pinoresinol reductase;    Pinoresinol lariciresinol reductase;    Eugenol;    Coniferyl alcohol;    Pinoresinol;    Lignan;    Biocatalysis;    Kinetic resolution;   

DOI  :  10.1186/s12934-016-0472-0

 received in 2016-02-05, accepted in 2016-04-24,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundPinoresinol is a high-value plant-derived lignan with multiple health supporting effects. Enantiomerically pure pinoresinol can be isolated from natural sources, but with low efficiency. Most chemical and biocatalytic approaches that have been described for the synthesis of pinoresinol furnish the racemic mixture. In this study we devised a three-step biocatalytic cascade for the production of enantiomerically pure pinoresinol from the cheap compound eugenol. Two consecutive oxidations of eugenol through vanillyl-alcohol oxidase and laccase are followed by kinetic resolution of racemic pinoresinol by enantiospecific pinoresinol reductases.ResultsThe addition of the enantiospecific pinoresinol reductase from Arabidopsis thaliana for kinetic resolution of (±)-pinoresinol to an in vitro cascade involving the vanillyl-alcohol oxidase from Penicillium simplicissimum and the bacterial laccase CgL1 from Corynebacterium glutamicum resulted in increasing ee values for (+)-pinoresinol; however, an ee value of 34 % was achieved in the best case. The ee value could be increased up to ≥99 % by applying Escherichia coli-based whole-cell biocatalysts. The optimized process operated in a one-pot “two-cell” sequential mode and yielded 876 µM (+)-pinoresinol with an ee value of 98 %. Switching the reductase to the enantiospecific pinoresinol lariciresinol reductase from Forsythia intermedia enabled the production of 610 µM (−)-pinoresinol with an ee value of 97 %.ConclusionA new approach for the synthesis of enantiomerically pure (+)- and (−)-pinoresinol is described that combines three biotransformation steps in one pot. By switching the reductase in the last step, the whole-cell biocatalysts can be directed to produce either (+)- or (−)-pinoresinol. The products of the reductases’ activity, (−)-lariciresinol and (−)-secoisolariciresinol, are valuable precursors that can also be applied for the synthesis of further lignans.

【 授权许可】

CC BY   
© Ricklefs et al. 2016