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FEMS Microbiol Lett. 2000 Sep 1;190(1):39-43.

The role of xylulokinase in Saccharomyces cerevisiae xylulose catabolism.

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1
VTT Biotechnology, Espoo, Finland. peter.richard@vtt.fi

Abstract

Many yeast species have growth rates on D-xylulose of 25-130% of those on glucose, but for Saccharomyces cerevisiae this ratio is only about 6%. The xylulokinase reaction has been proposed to be the rate-limiting step in the D-xylulose fermentation with S. cerevisiae. Over-expression of xylulokinase encoding XKS1 stimulated growth on D-xylulose in a S. cerevisiae strain to about 20% of the growth rate on glucose and deletion of the gene prevented growth on D-xylulose and D-xylulose metabolism. We have partially purified the xylulokinase and characterised its kinetic properties. It is reversible and will also accept D-ribulose as a substrate.

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