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Characterization of the multiple catalytic activities of tartrate dehydrogenase.
Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461.
Tartrate dehydrogenase (TDH) has been purified to apparent homogeneity from Pseudomonas putida and has been demonstrated to catalyze three different NAD(+)-dependent reactions. TDH catalyzes the oxidation of (+)-tartrate to form oxaloglycolate and the oxidative decarboxylation of D-malate to form pyruvate and CO2. D-Glycerate and CO2 are formed from meso-tartrate in a reaction that is formally a decarboxylation with no net oxidation or reduction. The steady-state kinetics of the first two reactions have been investigated and found to follow primarily ordered mechanisms. The pH dependence of V and V/K was determined and indicates that catalysis requires that a base on the enzyme with a pK of 6.7 be unprotonated. TDH activity requires a divalent and a monovalent cation. Kinetic data suggest that the cations function in substrate binding and facilitation of the decarboxylation of beta-ketoacid intermediates.
PMID: 2184888 [PubMed - indexed for MEDLINE]
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Cited by 3 PubMed Central articles
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[J Bacteriol. 2008]
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Systems approach to refining genome annotation.
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[Proc Natl Acad Sci U S A. 2006]
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Sequence and mutational analysis of a tartrate utilization operon from Agrobacterium vitis.
Crouzet P, Otten L.
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[J Bacteriol. 1995]