Abstract
Ethylene glycol (EG) is an important platform chemical with steadily expanding global demand. Its commercial production is currently limited to fossil resources; no biosynthesis route has been delineated. Herein, a biosynthesis route for EG production from d-xylose is reported. This route consists of four steps: d-xylose → d-xylonate → 2-dehydro-3-deoxy-d-pentonate → glycoaldehyde → EG. Respective enzymes, d-xylose dehydrogenase, d-xylonate dehydratase, 2-dehydro-3-deoxy-d-pentonate aldolase, and glycoaldehyde reductase, were assembled. The route was implemented in a metabolically engineered Escherichia coli, in which the d-xylose → d-xylulose reaction was prevented by disrupting the d-xylose isomerase gene. The most efficient construct produced 11.7 g L−1 of EG from 40.0 g L−1 of d-xylose. Glycolate is a carbon-competing by-product during EG production in E. coli; blockage of glycoaldehyde → glycolate reaction was also performed by disrupting the gene encoding aldehyde dehydrogenase, but from this approach, EG productivity was not improved but rather led to d-xylonate accumulation. To channel more carbon flux towards EG than the glycolate pathway, further systematic metabolic engineering and fermentation optimization studies are still required to improve EG productivity.
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Acknowledgments
This work was supported by Priority Research Centers Program through the National Research Foundation of Korea funded by the Ministry of Education, Science, and Technology (2012–0006693). The authors would like to thank Professor Chankyu Park from Korea Advanced Institute of Science and Technology (KAIST) for generously providing the pET15a-yqhD plasmid and Professor Jaejoon Han from Sungkyunkwan University for kindly providing a reagent for the enzyme activity assays.
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Liu, H., Ramos, K.R.M., Valdehuesa, K.N.G. et al. Biosynthesis of ethylene glycol in Escherichia coli . Appl Microbiol Biotechnol 97, 3409–3417 (2013). https://doi.org/10.1007/s00253-012-4618-7
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DOI: https://doi.org/10.1007/s00253-012-4618-7