Abstract
Erythritol as a four-carbon polyol has been widely used in food, pharmaceutical and daily chemical industries with characteristics of low caloric value and high chemical stability. Here, a system metabolic engineering strategy was used to increase the yield of erythritol from glycerol in Yarrowia lipolytica by enhancing the substrate transformation and restricting the by-product synthesis. Specifically, we determined that over-expression of a newly identified erythrose reductase YPR1 was able to improve the erythritol production as same as the well-known erythrose reductase ER27. Instead of its up-regulation, knockout of erythrose reductase ER10 was effective to improve erythritol synthesis. Moreover, both over-expression of YPR1 and deletion of ER10 significantly accelerated the glycerol utilization in response to high osmotic stress. To further decrease the by-product accumulation, a restriction and recycling strategy was implemented by knockout of mannitol dehydrogenase MDH2 and enhancement of arabitol dehydrogenase ADH1 and fructokinase HXK1. The engineered strain YL13 produced a titer of 25 g/L erythritol and less than 0.5 g/L mannitol and arabitol. By over-expression of transketolase TKL1, the final strain YL14 produced 28.5 g/L erythritol and none of mannitol and arabitol. This study provides a new idea for reducing the production of by-products and improving the glycerol conversion to erythritol.
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Acknowledgements
This study was supported by the National Natural Science Fund for Young Scholars (32001035), the National Key R&D Program of China (2017YFE0115600, 2019YFA0904302) and the 111 Project (B18022).
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Ya-Ting Wang and Ling-Xuan Zhao designed and carried out the experiments to construct engineered strains. Liu-Jing Wei, Jun Chen and Zhijie Liu designed and carried out the fermentation. Feng Liu and Qiang Hua drafted the work and revised. Ya-Ting Wang, Ling-Xuan Zhao, Liu-Jing Wei, Jun Chen, Zhijie Liu and Feng Liu, Qiang Hua contributed to final approval of the version to be published.
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Wang, YT., Zhao, LX., Wei, LJ. et al. Metabolic engineering of erythritol production from glycerol by Yarrowia lipolytica. Biotechnol Bioproc E 29, 119–127 (2024). https://doi.org/10.1007/s12257-024-00005-9
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DOI: https://doi.org/10.1007/s12257-024-00005-9