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- W2044688300 abstract "The biotransformation of d-arabitol into xylitol was investigated with focus on the conversion of d-xylulose into xylitol. This critical conversion was accomplished using Escherichia coli to co-express a xylitol dehydrogenase gene from Gluconobacter oxydans and a cofactor regeneration enzyme gene which was a glucose dehydrogenase gene from Bacillus subtilis for system 1 and an alcohol dehydrogenase gene from G. oxydans for system 2. Both systems efficiently converted d-xylulose into xylitol without the addition of expensive NADH. Approximately 26.91 g/L xylitol was obtained from around 30 g/L d-xylulose within system 1 (E. coli Rosetta/Duet-xdh-gdh), with a 92% conversion yield, somewhat higher than that of system 2 (E. coli Rosetta/Duet-xdh-adh, 24.9 g/L, 85.2%). The xylitol yields for both systems were more than 3-fold higher compared to that of the G. oxydans NH-10 cells (7.32 g/L). The total turnover number (TTN), defined as the number of moles of xylitol formed per mole of NAD+, was 32,100 for system 1 and 17,600 for system 2. Compared with that of G. oxydans NH-10, the TTN increased by 21-fold for system 1 and 11-fold for system 2, hence, the co-expression systems greatly enhanced the NADH supply for the conversion, benefiting the practical synthesis of xylitol." @default.
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- W2044688300 date "2012-07-01" @default.
- W2044688300 modified "2023-10-16" @default.
- W2044688300 title "Construction and co-expression of plasmid encoding xylitol dehydrogenase and a cofactor regeneration enzyme for the production of xylitol from d-arabitol" @default.
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- W2044688300 doi "https://doi.org/10.1016/j.enzmictec.2012.05.002" @default.
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