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The three enzymes glucokinase (EC 2.7.1.2), fructokinase (EC 2.7.1.4) and glucose-6-phosphate dehydrogenase (EC 1.1.1.49) were isolated in high yield from extracts of Zymomonas mobilis. The principal steps in the isolation procedures involved the use of selected dye-ligand adsorbent columns, with affinity elution of two of the three enzymes. Glucokinase and fructokinase are dimeric proteins (2 X 33000 Da and 2 X 28000 Da respectively) and glucose-6-phosphate dehydrogenase is a tetramer (4 X 52000 Da). Some similarities in the structural and kinetic parameters of the two kinases were noted, but they have absolute specificity for their substrates. Fructokinase is strongly inhibited by glucose; otherwise non-substrate sugars had little effect on any of the three enzymes.

Simultaneous purification and characterization of glucokinase, fructokinase and glucose-6-phosphate dehydrogenase from Zymomonas mobilis