Production of xylitol from d-xylose and glucose with recombinant Corynebacterium glutamicum

So Hyun Kim, Ji Yeong Yun, Sung Gun Kim, Jin Ho Seo, Jin Byung Park

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

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 XYL1of 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.

Original languageEnglish
Pages (from-to)366-371
Number of pages6
JournalEnzyme and Microbial Technology
Volume46
Issue number5
DOIs
StatePublished - Apr 2010

Keywords

  • Biotransformation
  • Corynebacterium glutamicum
  • Fed-batch cultivation
  • Xylitol

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