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- Cloning, Expression, and Characterization of Xylose Reductase with Higher Activity from Candida tropicalis
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Feiwei Zhang , Dairong Qiao , Hui Xu , Chong Liao , Shilin Li , Yi Cao
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J. Microbiol. 2009;47(3):351-357. Published online June 26, 2009
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DOI: https://doi.org/10.1007/s12275-008-0225-9
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Abstract
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Xylose reductase (XR) is a key enzyme in xylose metabolism because it catalyzes the reduction of xylose to xylitol. In order to study the characteristics of XR from Candida tropicalis SCTCC 300249, its XR gene(xyl1) was cloned and expressed in Escherichia coli BL21 (DE3). The fusion protein was purified effectively by Ni2+-chelating chromatography, and the kinetics of the recombinant XR was investigated. The Km values of the C. tropicalis XR for NADPH and NADH were 45.5 uM and 161.9 uM, respectively, which demonstrated that this XR had dual coenzyme specificity. Moreover, this XR showed the highest catalytic efficiency (kcat=1.44x04 min-1) for xylose among the characterized aldose reductases. Batch fermentation was performed with Saccharomyces serivisiae W303-1A:pYES2XR, and resulted in 7.63 g/L cell mass, 93.67 g/L xylitol, and 2.34 g/Lh xylitol productivity. This XR coupled with its dual coenzyme specificity, high activity, and catalytic efficiency proved its utility in in vitro xylitol production.
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Citations
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- Electrochemical Reduction of Xylose to Xylitol by Whole Cells or Crude Enzyme of Candida peltata
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Sun Mi Park , Byung In Sang , Dae Won Park , Doo Hyun Park
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J. Microbiol. 2005;43(5):451-455.
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DOI: https://doi.org/2276 [pii]
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Abstract
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In this study, whole cells and a crude enzyme of Candida peltata were applied to an electrochemical bioreactor, in order to induce an increment of the reduction of xylose to xylitol. Neutral red was utilized as an electron mediator in the whole cell reactor, and a graphite-Mn(IV) electrode was used as a catalyst in the enzyme reactor in order to induce the electrochemical reduction of NAD+ to NADH. The efficiency with which xylose was converted to xylitol in the electrochemical bioreactor was five times higher than that in the conventional bioreactor, when whole cells were employed as a biocatalyst. Meanwhile, the xylose to xylitol reduction efficiency in the enzyme reactor using the graphite-Mn (IV) electrode and NAD+ was twice as high as that observed in the conventional bioreactor which utilized NADH as a reducing power. In order to use the graphite-Mn(IV) electrode as a catalyst for the reduction of NAD+ to NADH, a bioelectrocatalyst was engineered, namely, oxidoreductase (e.g. xylose reductase). NAD+ can function in this biotransformation procedure without any electron mediator or a second oxidoreductase for NAD+/NADH recycling