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Two members of the ATP-dependent class of phosphoenolpyruvate carboxykinases (PEPCKs) (Saccharomyces cerevisiae and Anaerobiospirillum succiniciproducens) have been comparatively studied with regard to their oxaloacetate (OAA) decarboxylase and pyruvate kinase-like activities. The pyruvate kinase-like activities were dependent on the presence of Mn2+; at the same concentrations Mg2+ was not effective...
Anaerobiospirillum succiniciproducens His225Gln, Asp262Asn, Asp263Asn, and Thr249Asn phosphoenolpyruvate carboxykinases were analyzed for their oxaloacetate decarboxylase, and pyruvate kinase–like activities. The His225Gln and Asp263Asn enzymes showed increased Km values for Mn2+ and PEP compared with the native enzyme, suggesting a role of His225 and Asp263 in Mn2+ and PEP binding. No mayor alterations...
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