Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 46, Issue 5, Pages 366-371Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2009.12.012
Keywords
Biotransformation; Corynebacterium glutamicum; Xylitol; Fed-batch cultivation
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Funding
- Seoul Development Institute [KU080657]
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The product spectrum of a soil bacterium Corynebacterium glutamicum was extended to include a functional sugar xylitol. The recombinant C glutamicum, engineered to express the xylose reductase gene XYL1 of Pichia stipitis, produced xylose reductase with a specific activity of ca. 0.6 U/mg protein. Due to the absence of xylose isomerase and xylitol dehydrogenase genes, loose catabolite repression, high NADPH regeneration capacity, and tolerance against sugar-induced osmotic stress, the recombinant biocatalyst was able to efficiently produce xylitol from D-xylose using glucose as source of reducing equivalents. A fed-batch culture-based biotransformation allowed xylitol to accumulate to a concentration of 34.4 g/L (226 mM) in the medium with the specific productivity and product yield of xylose of 0.092 g/g dry cells/h and over 97%, respectively. The molar yield of xylitol to energy source during the biotransformation reached approximately 1.6 mol of xylose/mol of glucose. (C) 2009 Elsevier Inc. All rights reserved.
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