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The kinetic affinity for CO2 of phosphoenolpyruvate PEP5 carboxykinase from Anaerobiospirillum succiniciproducens, an obligate anaerobe which PEP carboxykinase catalyzes the carboxylation of PEP in one of the final steps of succinate production from glucose, is compared with that of the PEP carboxykinase from Saccharomyces cerevisiae, which catalyzes the decarboxylation of oxaloacetate in one of the...
Escherichia coli and Saccharomyces cerevisiae phosphoenolpyruvate carboxykinases (PEPCKs), were inactivated by pyridoxal 5 -phosphate followed by reduction with sodium borohydride. Concomitantly with the inactivation, one pyridoxyl group was incorporated in each enzyme monomer. The modification and loss of activity was prevented in the presence of ADP plus Mn 2+ . After digestion of...
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