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5-Keto-d-fructose

V. PHOSPHORYLATION BY YEAST HEXOKINASE

From the ¹ From the Department of Biological Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel, and the Department of Biochemistry, Albert Einstein College of Medicine, Yeshiva University, New York, New York 10461

Yeast hexokinase was shown to catalyze the phosphorylation of 5-keto-d-fructose (d-threo-2,5-hexodiulose) in the presence of ATP. The product was identified as a monophosphate ester. A procedure for the preparation of this ester and some of its properties are described. Reduction of the monophosphate ester by the NADPH-5-keto-d-fructose reductase from Gluconobacter cerinus yielded fructose 1-phosphate.

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