title: The role of Yap1p and Skn7p-mediated oxidative stress response in the defence of Saccharomyces cerevisiae against singlet oxygen.
abstract: The production of the reactive oxygen species superoxide and hydrogen peroxide in Saccharomyces cerevisiae induces the expression of various defence genes involved in an oxidative stress response. Expression of many of these genes has been shown to be coordinated by two transcriptional regulators, Yap1p and Skn7p, either alone or in concert. Here, we investigated the role of the Yap1p and Skn7p-mediated stress response in the defence against singlet oxygen, a non-radical reactive oxygen species produced mainly by photosensitized reactions in illuminated cells. Both, a yap1 and skn7 mutant were highly sensitive to Rose Bengal, an exogenous photosensitizer producing singlet oxygen in the light. The expression of a Yap1p-dependent reporter gene was induced by increased singlet oxygen production, showing that singlet oxygen activates general oxidative stress response mechanisms required for the resistance against Rose Bengal treatment. This response was also slightly stimulated by light in the absence of the photosensitizer, possibly due to singlet oxygen production by endogenous photosensitizers. The expression pattern of four oxidative stress genes in a yap1, skn7 and wild-type strain and the sensitivity of the corresponding mutants exposed to different oxidative stress conditions proved a role of Yap1p and Skn7p in the defence against singlet oxygen. Similarities in the genetic responses against singlet oxygen and hydroperoxides suggest an overlap in the oxidative stress response against these reactive oxygen species.
authors.affiliation: Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Environmental Toxicology, Ueberlandstrasse 133, 8600 Dübendorf, Switzerland.
authors.forename: Katrin
authors.initials: K
authors.lastname: Brombacher
authors.forename: Beat B
authors.initials: BB
authors.lastname: Fischer
authors.forename: Karin
authors.initials: K
authors.lastname: Rüfenacht
authors.forename: Rik I L
authors.initials: RI
authors.lastname: Eggen
mesh_terms: D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D015971:Gene Expression Regulation, Enzymologic; D015966:Gene Expression Regulation, Fungal; D005721:Glutamate-Cysteine Ligase / Q000235:genetics / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D018384:Oxidative Stress / Q000502:physiology; D010544:Peroxidases / Q000235:genetics / Q000378:metabolism; D017319:Photosensitizing Agents / Q000494:pharmacology; D012331:RNA, Fungal / Q000737:chemistry / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012395:Rose Bengal / Q000494:pharmacology; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D026082:Singlet Oxygen / Q000378:metabolism*; D013880:Thioredoxin-Disulfide Reductase / Q000235:genetics / Q000378:metabolism; D013879:Thioredoxins / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D024483:Vitamin K 3 / Q000494:pharmacology
chemical_list: D004268:DNA-Binding Proteins; D008565:Membrane Proteins; D017319:Photosensitizing Agents; D012331:RNA, Fungal; C083962:SKN7 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; C516110:TRX2 protein, S cerevisiae; D014157:Transcription Factors; C086677:YAP1 protein, S cerevisiae; D026082:Singlet Oxygen; D012395:Rose Bengal; D013879:Thioredoxins; D024483:Vitamin K 3; D006861:Hydrogen Peroxide; D010544:Peroxidases; C496253:Tsa1 protein, S cerevisiae; D013880:Thioredoxin-Disulfide Reductase; C490862:GSH1 protein, S cerevisiae; D005721:Glutamate-Cysteine Ligase