Comparison of D-malate and beta, beta-dimethylmalate dehydrogenases from Pseudomonas fluorescens UK-1

Biochim Biophys Acta. 1980 Jun 13;613(2):266-74. doi: 10.1016/0005-2744(80)90082-0.


D-Malate dehydrogenase (D-malate:NAD+ oxidoreductase (decarboxylating), EC was purified to homogeneity from Pseudomonas fluorescens UK-1 grown on D-malate and some properties of the purified enzyme were compared with those of beta, beta-dimethylmalate dehydrogenase (3,3-dimethyl-D-malate:NAD+ oxidoreductase (decarboxylating), EC D-Malate dehydrogenase has the molecular weight and subunit size of 140 000 and 34 000, respectively (the same as those of beta, beta-dimethylmalate dehydrogenase). The amino acid compositions of the two enzymes are similar as well. D-Malate dehydrogenase cross-reacted with anti-beta, beta-dimethylmalate dehydrogenase and beta, beta-dimethylmalate dehydrogenase cross-reacted with anti-D-malate dehydrogenase. The two dehydrogenases have similar catalytical properties. Both of the dehydrogenases were unaffected by sulphydryl reagents but were inactivated by 1,2-butanedione. NAD provided better protection against inactivation than D-malate or beta,beta-dimethyl-DL-malate.

Publication types

  • Comparative Study

MeSH terms

  • Alcohol Oxidoreductases / immunology
  • Alcohol Oxidoreductases / isolation & purification*
  • Amino Acids / analysis
  • Bacterial Proteins / isolation & purification
  • Catalysis
  • Chemical Phenomena
  • Chemistry
  • Malate Dehydrogenase / immunology
  • Malate Dehydrogenase / isolation & purification*
  • Malates / immunology
  • Malates / isolation & purification
  • Molecular Weight
  • Pseudomonas fluorescens / enzymology*


  • Amino Acids
  • Bacterial Proteins
  • Malates
  • Alcohol Oxidoreductases
  • Malate Dehydrogenase
  • dimethylmalate dehydrogenase