Transient kinetics of ligand binding and role of the C-terminus in the dUTPase from equine infectious anemia virus

Johan Nord, Martin Kiefer, Hans-Werner Adolph, Michael M Zeppezauer, Per-Olof Nyman

Research output: Contribution to journalArticlepeer-review

24 Citations (SciVal)

Abstract

Transient kinetics of the equine infectious anemia virus deoxyuridine 5'-triphosphate nucleotide hydrolase were characterized by monitoring the fluorescence of the protein. Rate constants for the association and dissociation of substrate and inhibitors were determined and found to be consistent with a one-step mechanism for substrate binding. A C-terminal part of the enzyme presumed to be flexible was removed by limited trypsinolysis. As a result, the activity of the dUTPase was completely quenched, but the rate constants and fluorescent signal of the truncated enzyme were affected only to a minor degree. We conclude that the flexible C-terminus is not a prerequisite for substrate binding, but indispensable for catalysis.
Original languageEnglish
Pages (from-to)312-316
JournalFEBS Letters
Volume472
Issue number2-3
DOIs
Publication statusPublished - 2000

Subject classification (UKÄ)

  • Biological Sciences

Keywords

  • C-terminus
  • Deoxyuridine 5'-triphosphate nucleotide hydrolase
  • Deoxyuridine
  • Equine infectious anemia virus
  • Ligand binding
  • Pre-steady-state kinetics
  • Rate constant

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