Fructose 2-phosphate, an intermediate of the dephosphorylation of fructose 2,6-bisphosphate with a purified yeast enzyme
- 1 April 1987
- journal article
- Published by Wiley in European Journal of Biochemistry
- Vol. 164 (1), 27-30
- https://doi.org/10.1111/j.1432-1033.1987.tb10987.x
Abstract
A fructose-2,6-bisphosphate dephosphorylating enzyme was 3000-fold purified to electrophoretic homogeneity from Saccharomyces cerevisiae. Half-maximal activity was obtained at pH 6.0 with 6 microM fructose 2,6-bisphosphate and 0.15 mM Mg2+. On incubation for 90 min with fructose 2,6-bisphosphate, about 80% of the substrate appears with an almost linear time dependence as fructose. In the first 30 min a substance accumulates to about 40% of the consumed fructose 2,6-bisphosphate which forms free fructose on mild acid treatment. Formation of fructose 6-phosphate was negligible. The mild-acid-labile intermediate was identified as fructose 2-phosphate by comparative ion-exchange chromatography with authentic fructose 2-phosphate synthesized from fructose 1-phosphate [Pontis, H.G. & Fischer, C.L. (1963) Biochem. J. 89, 452-459]. The data suggest the reaction sequence fructose 2,6-bisphosphate----fructose 2-phosphate----fructose. The designation fructose-2,6-bisphosphate 6-phosphohydrolase is proposed for the enzyme described here.Keywords
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