Kinetics of the coupled reaction catalysed by a fusion protein of yeast mitochondrial malate dehydrogenase and citrate synthase: Kinetics of a fusion protein of MDH and CS

Henrik Pettersson, Peter Olsson, Leif Bülow, Gösta Pettersson

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanistic implications of the kinetic behaviour of a fusion protein of mitochondrial malate dehydrogenase and citrate synthase have been reanalysed in view of predictions based on experimentally determined kinetic parameter values for the dehydrogenase and synthase activities of the protein. The results show that the time-course of citrate formation from malate in the coupled reaction catalysed by the fusion protein can be most satisfactorily accounted for in terms of a free-diffusion mechanism when consideration is taken to the inhibitory effects of NADH and oxaloacetate on the malate dehydrogenase activity. The effect of aspartate aminotransferase on the coupled reaction is likewise fully consistent with that expected for a free-diffusion mechanism. It is concluded that no tenable kinetic evidence is available to support the proposal that the fusion protein catalyses citrate formation from malate by a mechanism involving channelling of the intermediate oxaloacetate.
Original languageEnglish
Pages (from-to)5041-5046
Number of pages6
JournalEuropean Journal of Biochemistry
Volume267
Issue number16
DOIs
Publication statusPublished - 2000

Subject classification (UKÄ)

  • Theoretical Chemistry (including Computational Chemistry)
  • Biological Sciences

Free keywords

  • fusion protein
  • channelling
  • malate dehydrogenase
  • Citrate (si)-Synthase
  • Oxaloacetic Acid
  • Recombinant Fusion Proteins
  • Saccharomyces cerevisiae
  • NAD
  • Models, Chemical
  • Mitochondria
  • Kinetics

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