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Purification and characterization of the malate dehydrogenase from Streptomyces aureofaciens. 1998

D Mikulásová, and M Kollárová, and M Miginiac-Maslow, and P Decottignies, and J P Jacquot, and E Kutejová, and N Mernik, and I Egyudová, and R Musrati, and T Horecká
Department of Biochemistry, Faculty of Sciences, Comenius University, Bratislava, Slovak Republic.

The malate dehydrogenase (MDH) from Streptomyces aureofaciens was purified to homogeneity and its physical and biochemical properties were studied. Its amino-terminal sequence perfectly matched the amino-terminal sequence of the MDH from Streptomyces atratus whose biochemical characteristics have never been determined. The molecular mass of the native enzyme, estimated by size-exclusion chromatography, was 70 kDa. The protein was a homodimer, with a 38-kDa subunit molecular mass. It showed a strong specificity for NADH and was much more efficient for the reduction of oxaloacetate than for the oxidation of malate, with a pH optimum of 8. Unlike MDHs from other sources, it was not inhibited by excess oxaloacetate. This first complete functional characterization of an MDH from Streptomyces shows that the enzyme is very similar in many respects to other bacterial MDHs with the notable exception of a lack of inhibition by excess substrate.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D008291 Malate Dehydrogenase An enzyme that catalyzes the conversion of (S)-malate and NAD+ to oxaloacetate and NADH. EC 1.1.1.37. Malic Dehydrogenase,NAD-Malate Dehydrogenase,Dehydrogenase, Malate,Dehydrogenase, Malic,Dehydrogenase, NAD-Malate,NAD Malate Dehydrogenase
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D008970 Molecular Weight The sum of the weight of all the atoms in a molecule. Molecular Weights,Weight, Molecular,Weights, Molecular
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D013304 Streptomyces aureofaciens An actinomycete from which the antibiotic CHLORTETRACYCLINE is obtained.

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