Abstract
Grape juice contains about equal amounts of glucose and fructose, but wine strains of Saccharomyces cerevisiae ferment glucose slightly faster than fructose, leading to fructose concentrations that exceed glucose concentrations in the fermenting must. A high fructose/glucose ratio may contribute to sluggish and stuck fermentations, a major problem in the global wine industry. We evaluated wine yeast strains with different glucose and fructose consumption rates to show that a lower glucose preference correlates with a higher fructose/glucose phosphorylation ratio in cell extracts and a lower K m for both sugars. Hxk1 has a threefold higher V max with fructose than with glucose, whereas Hxk2 has only a slightly higher V max with glucose than with fructose. Overexpression of HXK1 in a laboratory strain of S. cerevisiae (W303–1A) accelerated fructose consumption more than glucose consumption, but overexpression in a wine yeast strain (VIN13) reduced fructose consumption less than glucose consumption. Results with laboratory strains expressing a single kinase showed that total hexokinase activity is inversely correlated with the glucose/fructose (G/F) discrepancy. The latter has been defined as the difference between the rate of glucose and fructose fermentation. We conclude that the G/F discrepancy in wine yeast strains correlates with the kinetic properties of hexokinase-mediated sugar phosphorylation. A higher fructose/glucose phosphorylation ratio and a lower K m might serve as markers in selection and breeding of wine yeast strains with a lower tendency for sluggish fructose fermentation.
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Acknowledgments
We thank Willy Verheyden for technical assistance and Nico Van Goethem for help with the preparation of the figures. This work was supported by grants from the National Research Foundation and Winetech in South Africa to I.S.P., by the Research Fund of the Katholieke Universiteit Leuven (Flanders-South Africa project BIL02/34) to J.M.T. and I.S.P. and Concerted Research Actions to J.M.T.
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Berthels, N.J., Cordero Otero, R.R., Bauer, F.F. et al. Correlation between glucose/fructose discrepancy and hexokinase kinetic properties in different Saccharomyces cerevisiae wine yeast strains. Appl Microbiol Biotechnol 77, 1083–1091 (2008). https://doi.org/10.1007/s00253-007-1231-2
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DOI: https://doi.org/10.1007/s00253-007-1231-2