Current Genetics

, Volume 21, Issue 4–5, pp 269–273 | Cite as

The PAR1 (YAP1/SNQ3) gene of Saccharomyces cerevisiae, ac-jun homologue, is involved in oxygen metabolism

  • Norbert Schnell
  • Bernhard Krems
  • Karl-Dieter Entian
Original Articles

Summary

The PAR1/SNQ3 gene of S. cerevisiae, which increases resistance to iron chelators in multi-copy transformants, is identical to the YAP1 gene, a yeast activator protein isolated as a functional homologue of the human c-jun oncogene by binding specifically to the AP-1 consensus box. The observed H2O2-sensitivity of par1 mutants has been attributed to an increased sensitivity to reduced oxygen intermediates. Accordingly, par1 mutants did not survive an elevated oxygen pressure and were very sensitive to menadione and methylviologene, two chemicals enhancing the deleterious effects of oxygen. The specific activities of enzymes involved in oxygen detoxification, such as superoxide dismutase, glucose 6-phosphate dehydrogenase and glutathione reductase, were decreased in par1 mutants and increased after PAR1 over-expression. As in the case of oxygen detoxification enzymes, the cellular levels of glutathione were similarly affected. These observations indicate that PAR1/YAP1/SNQ3 is involved in the gene regulation of certain oxygen detoxification enzymes. The finding that H2O2 promotes DNA-binding of human c-jun is consistent with a similar function for PAR1/YAP1/SNQ3 and c-jun in cellular metabolism.

Key words

Saccharomyces cerevisiae Transcriptional activator Oxidative stress Glutathione 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Norbert Schnell
    • 1
  • Bernhard Krems
    • 1
  • Karl-Dieter Entian
    • 1
  1. 1.Institut für MikrobiologieJ. W. Goethe-Universität FrankfurtFrankfurt/MainFederal Republic of Germany

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