Specific derivatization of the active site tyrosine in dUTPase perturbs ligand binding to the active site

Beata G. Vertessy, Rebecca Persson, Anna Maria Rosengren, Michael Zeppezauer, Per Olof Nyman

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Selective modification of one (of three) tyrosine residue per enzyme monomer lends to inactivation of dUTPase of the retrovirus equine infectious anemia virus (EIAV). The substrate dUMP and the cofactor Mg2+ protects against inactivation and modification, in agreement with the study on E. coli dUTPase. Amino acid analyses of nitrated dUTPases confirmed Tyr-selectivity of modification. The nitrated residue in E. coli dUTPase was identified as the evolutionary highly conserved Tyr-93. The modifiable residue is shown to be the only Tyr exposed in both E. coli and EIAV dUTPases. As a consequence of Tyr-93 derivatization, the Mg2+-dependent interaction between the substrate-analogue dUDP and E. coli dUTPase becomes impaired as shown by circular dichroism spectroscopy, here presented as a tool for monitoring ligand binding to the active site.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalBiochemical and biophysical research communications
Issue number2
Publication statusPublished - Feb 15 1996


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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