Physiological properties of a mutant of Pachysolen tannophilus deficient in NADPH-dependent D-xylose reductase
- National Research Council of Canada, Ottawa, Ontario (Canada)
- Technische Universitaet Wien, Vienna (Austria)
A D-xylose reductase mutant of Pachysolen tannophilus was isolated on the basis of its poor growth on D-xylose but normal growth on xylitol and D-glucose. Fractionation of cell extracts indicated that the mutant was deficient in D-cylose reductase activity that used NADPH exclusively as a cofactor, but not in activity that used both NADH and NADPH. Mutant cultures grown on D-xylose as the sole carbon source exhibited some properties that would be desired in improved strains. Growth rate, growth yield, and D-xylose consumption rate of the mutant were less sensitive than those of the wild type to changes in aeration rate. D-Xylose was utilized more efficiently in that less of a by-product, xylitol, was produced. In addition, under low aeration conditions, more ethanol was produced. A disadvantage was a relatively slow rate of D-xylose utilization.
- OSTI ID:
- 6122041
- Journal Information:
- Applied and Environmental Microbiology; (USA), Journal Name: Applied and Environmental Microbiology; (USA) Vol. 55:11; ISSN 0099-2240; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
090900* -- Biomass Fuels-- Processing-- (1990-)
ALCOHOLS
ALDEHYDES
BIOSYNTHESIS
CARBOHYDRATES
COENZYMES
ENZYMES
ETHANOL
EUMYCOTA
FUNGI
HYDROXY COMPOUNDS
METABOLISM
MICROORGANISMS
MONOSACCHARIDES
NADP
NUCLEOTIDES
ORGANIC COMPOUNDS
OXIDOREDUCTASES
PENTOSES
PHYSIOLOGY
PLANTS
SACCHARIDES
SYNTHESIS
XYLOSE
YEASTS