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1. The reaction catalysed by glucose 6-phosphate dehydrogenase (D-glucose 6-phosphate-NADP+ oxidoreductase, EC 1.1.1.49) from baker's yeast was studied in 42mM-glycylglycine buffer, pH7.4 at 25 degrees C, by initial-velocity studies and by the use of NADPH as a product inhibitor. 2. The reactions catalysed by both the soluble enzyme and a stable enzyme covalently attached to CNBr-activated Sepharose 4B probably follow an ordered reaction mechanism with NADP+ and NADPH as the leading reactants. 3. The kinetic constants obtained for the soluble enzyme lere: KNADP+m, 19 muM; KNADP+s, 23 muM; KNADPHs, 15 muM. Similar values were obtained for the immobilized enzyme. 4. The assay of the immobilized enzyme was done by using a micro packed-bed recirculation reactor, and the advantages of this technique are discussed.

biochemical journal

Kinetic mechanism from steady-state kinetics of the reaction catalysed by baker's-yeast glucose 6-phosphate dehydrogenase in solution and covalently attached to sepharose