Abstract
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. These activities were synergistically activated by a combination of both metal ions. V max for these activities in A. succiniciproducens and S. cerevisiae PEPCKs was 0.13% and 1.2% that of the principal reaction, respectively. The OAA decarboxylase activity was nucleotide independent and, with decreasing order of effectiveness, these activities were supported by Mn2+ and Mg2+. AMP is an activator of these reactions. V max for the OAA decarboxylase activities in A. succiniciproducens and S. cerevisiae PEPCKs was 4% and 0.2% that of the PEP-forming reaction, respectively.
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Jabalquinto, A.M., Laivenieks, M., Zeikus, J.G. et al. Characterization of the Oxaloacetate Decarboxylase and Pyruvate Kinase-like Activities of Saccharomyces cerevisiae and Anaerobiospirillum succiniciproducens Phosphoenolpyruvate Carboxykinases. J Protein Chem 18, 659–664 (1999). https://doi.org/10.1023/A:1020602222808
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DOI: https://doi.org/10.1023/A:1020602222808