Abstract
Vanillin is one of the most commonly used natural-occurring flavors in the world. This study successfully constructed an efficient whole-cell catalytic system for vanillin biosynthesis from ferulic acid by regulating feruloyl-CoA synthetase (FCS) and enoyl-CoA hydratase (ECH). First, we constructed an efficient cell-free catalytic system with FCS-Str (fcs from Streptomyces sp. V-1) and ECH-Str (ech from Streptomyces sp. V-1) combination at 1:1. The efficient cell-free catalytic system provided necessary strategies for optimizing the whole-cell catalytic system. Then, we constructed the recombinant Escherichia coli by heterologously expressing the fcs-Str and ech-Str combination. Moreover, E. coli JM109 was a better recombinant Escherichia coli than E. coli BL21 with higher vanillin production. Finally, we first adjusted the ratio of FCS and ECH in E. coli JM109 to 1:1 using two copies of fcs-Str. For higher vanillin production, we further optimized the induction conditions of E. coli JM109 to increase the amount of FCS and ECH. The optimized E. coli JM109-FE-F constructed in this study has the highest vanillin synthesis rate of converting 20 mM ferulic acid to 15 mM vanillin in 6 h among all of the E. coli catalytic systems. Our study made a significant contribution to the construction of the vanillin biosynthesis system and provided a valuable strategy for increasing vanillin production.
Key points
• The efficient cell-free vanillin biosynthesis system was constructed by FCS-Str and ECH-Str combination at 1:1.
• Escherichia coli JM109 was determined as a better recombinant Escherichia coli than E. coli BL21 with higher vanillin production.
• Escherichia coli JM109-FE-F with two copies of fcs-Str and one copy of ech-Str has the highest catalytic efficiency for vanillin production.
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Data availability
All datasets obtained for this study are included in the manuscript/supplementary material.
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Funding
This research was supported by the 2020 Team Innovation Project from the Fundamental Scientific Research Special Capital Fund of the National Universities, China (100034/1301030160) and the Natural Science Foundation of China (NSFC) Project (grant number 32172145). Fundamental Research Funds for Central Universities of the Central South University,100034/1301030160,Yong Hong Meng,Natural Science Foundation of China (NSFC) Project,32172145,Yong Hong Meng
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QC, DX, SQ, and YM designed the experiments. QC performed the experiments. QC and YM were responsible for data processing and analysis. QC, YM, and CH wrote and revised manuscripts.
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Chen, Q.H., Xie, D.T., Qiang, S. et al. Developing efficient vanillin biosynthesis system by regulating feruloyl-CoA synthetase and enoyl-CoA hydratase enzymes. Appl Microbiol Biotechnol 106, 247–259 (2022). https://doi.org/10.1007/s00253-021-11709-w
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DOI: https://doi.org/10.1007/s00253-021-11709-w