Archives of Microbiology

, 191:837

Response to different oxidants of Saccharomyces cerevisiaeure2Δ mutant

  • Tatina T. Todorova
  • Ventsislava Y. Petrova
  • Stéphane Vuilleumier
  • Anna V. Kujumdzieva
Original Paper

Abstract

Growth of Saccharomyces cerevisiaeure2Δ mutant strain was investigated in the presence of diverse oxidant compounds. The inability of the strain to grow on a medium supplemented with H2O2 was confirmed and a relationship between diminishing levels of glutathione (GSH) and peroxide sensitivity was established. Data for the lack of significant effect of URE2 disruption on the cellular growth in the presence of paraquat and menadione were obtained. The possible role of Ure2p in acquiring sensitivity to oxidative stress by means of its regulatory role in the GATA signal transduction pathway was discussed. It was suggested that the susceptibility of ure2Δ mutant to the exogenous hydrogen peroxide can result from increased GSH degradation due to the deregulated localization of the γ-glutamyl transpeptidase activating factors Gln3/Gat1. The important role of Ure2p in in vivo glutathione-mediated reactive oxygen species (ROS) scavenging was shown by measuring the activity of antioxidant enzymes glutathione peroxidase, superoxide dismutase (SOD) and catalase in an URE2 disrupted strain. A time-dependent increase in SOD and catalase activity was observed. More importantly, it was shown that the ure2 mutation could cause significant disturbance in cellular oxidant balance and increased ROS level.

Keywords

Ure2p Glutathione transferase SOD Catalase Oxidative stress Yeasts 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Tatina T. Todorova
    • 2
  • Ventsislava Y. Petrova
    • 1
  • Stéphane Vuilleumier
    • 2
  • Anna V. Kujumdzieva
    • 1
  1. 1.Department “General and Industrial Microbiology”, Faculty of BiologyThe Sofia University “St. Kliment Ohridski”SofiaBulgaria
  2. 2.University of Strasbourg UMR 7156 CNRSStrasbourg CedexFrance

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