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Metabolism and Enzymology

Ion-Exchange Chromatography Separates Activities Synthesizing and Degrading Fructose 2,6-Bisphosphate from C₃ and C₄ Leaves but Not from Rat Liver ¹

Division of Molecular Plant Biology, Hilgard Hall, University of California, Berkeley, California 94720

Fructose-6-phosphate,2-kinase and fructose-2,6-bisphosphatase were separated on the basis of charge from leaves of C₃ (spinach, lettuce, and pea) and C₄ (sorghum and amaranthus) plants but not from rat liver—a tissue known to contain a bifunctional enzyme with both activities. [2-³²P]Fructose 2,6-bisphosphate binding experiments also suggest that the major forms of these activities reside on different proteins in leaves.

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