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  • Title: Enhancement of xylitol production by attenuation of intracellular xylitol dehydrogenase activity in Candida tropicalis.
    Author: Ko BS, Kim DM, Yoon BH, Bai S, Lee HY, Kim JH, Kim IC.
    Journal: Biotechnol Lett; 2011 Jun; 33(6):1209-13. PubMed ID: 21331586.
    Abstract:
    To construct Candida tropicalis strains that produce a high yield of xylitol with no requirement for co-substrates, we engineered the yeast with an attenuated xylitol dehydrogenase (XDH) and then assessed the efficiency of xylitol production The mutants, strains XDH-5 (with only one copy of the XDH gene), and ARSdR-16 (with a mutated XDH gene) showed 70 and 40% of wild type (WT) XDH activity, respectively. Conversions of xylose to xylitol by WT, XDH-5, and ARSdR-16 were 62, 64, and 75%, respectively, with productivities of 0.52, 0.54, and 0.62 g l(-1) h(-1), respectively. The ARSdR-16 mutant strain produced xylitol with high yield and high productivity in a simple process that required no co-substrates, such as glycerol. This strain represents a promising alternative for efficient and cost-effective xylitol production.
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