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• W2109406269 abstract "Malic enzymes (MEs) catalyze the oxidative decarboxylation of malate in the presence of a divalent metal ion. In eukaryotes, well-conserved cytoplasmic, mitochondrial, and plastidic MEs have been characterized. On the other hand, distinct groups can be detected among prokaryotic MEs, which are more diverse in structure and less well characterized than their eukaryotic counterparts. In Escherichia coli, two genes with a high degree of homology to ME can be detected: sfcA and maeB. MaeB possesses a multimodular structure: the N-terminal extension shows homology to ME, while the C-terminal extension shows homology to phosphotransacetylases (PTAs). In the present work, a detailed characterization of the products of E. coli sfcA and maeB was performed. The results indicate that the two MEs exhibit relevant kinetic, regulatory, and structural differences. SfcA is a NAD(P) ME, while MaeB is a NADP-specific ME highly regulated by key metabolites. Characterization of truncated versions of MaeB indicated that the PTA domain is not essential for the ME reaction. Nevertheless, truncated MaeB without the PTA domain loses most of its metabolic ME modulation and its native oligomeric state. Thus, the association of the two structural domains in MaeB seems to facilitate metabolic control of the enzyme. Although the PTA domain in MaeB is highly similar to the domains of proteins with PTA activity, MaeB and its PTA domain do not exhibit PTA activity. Determination of the distinct properties of recombinant products of sfcA and maeB performed in the present work will help to clarify the roles of MEs in prokaryotic metabolism." @default.
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• W2109406269 date "2007-08-15" @default.
• W2109406269 modified "2023-10-06" @default.
• W2109406269 title "<i>Escherichia coli</i> Malic Enzymes: Two Isoforms with Substantial Differences in Kinetic Properties, Metabolic Regulation, and Structure" @default.
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• W2109406269 doi "https://doi.org/10.1128/jb.00428-07" @default.
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