Author:
Zhang Yang,Meng Wenchang,He Yuting,Chen Yuhui,Shao Mingyu,Yuan Jifeng
Abstract
Abstract
Background
Whole-cell biocatalysis has been exploited to convert a variety of substrates into high-value bulk or chiral fine chemicals. However, the traditional whole-cell biocatalysis typically utilizes the heterotrophic microbes as the biocatalyst, which requires carbohydrates to power the cofactor (ATP, NAD (P)H) regeneration.
Results
In this study, we sought to harness purple non-sulfur photosynthetic bacterium (PNSB) as the biocatalyst to achieve light-driven cofactor regeneration for cascade biocatalysis. We substantially improved the performance of Rhodopseudomonas palustris-based biocatalysis using a highly active and conditional expression system, blocking the side-reactions, controlling the feeding strategy, and attenuating the light shading effect. Under light-anaerobic conditions, we found that 50 mM ferulic acid could be completely converted to vanillyl alcohol using the recombinant strain with 100% efficiency, and > 99.9% conversion of 50 mM p-coumaric acid to p-hydroxybenzyl alcohol was similarly achieved. Moreover, we examined the isoprenol utilization pathway for pinene synthesis and 92% conversion of 30 mM isoprenol to pinene was obtained.
Conclusions
Taken together, these results suggested that R. palustris could be a promising host for light-powered biotransformation, which offers an efficient approach for synthesizing value-added chemicals in a green and sustainable manner.
Graphical Abstract
Funder
Natural Science Foundation of Fujian Province of China
Fundamental Research Funds for the Central Universities
Xiamen University
Guangdong Basic and Applied Basic Research Foundation
Daan Gene
Publisher
Springer Science and Business Media LLC
Subject
Management, Monitoring, Policy and Law,Energy (miscellaneous),Applied Microbiology and Biotechnology,Renewable Energy, Sustainability and the Environment,Biotechnology