Rck1 and Rck2 MAPKAP kinases and the HOG pathway are required for oxidative stress resistance

• We demonstrate a role in oxidative and metal stress resistance for the MAPK-activated protein kinases Rck1 and Rck2 in Saccharomyces cerevisiae. We show that Hog1 is robustly phosphorylated in a Pbs2-dependent way during oxidative stress, and that Rck2 also is phosphorylated under these circumstances. Hog1 concentrates in the nucleus in oxidative stress. Hog1 localization is partially dependent on Rck2, as rck2 cells have more nuclear Hog1 than wild-type cells. We find several proteins with a role in oxidative stress resistance using Rck1 or Rck2 as baits in a two-hybrid screen. We identify the transcription factor Yap2 as a putative target for Rck1, and the Zn2+ transporter Zrc1 as a target for Rck2. Yap2 is normally cytoplasmic, but rapidly migrates to the nucleus upon exposure to oxidative stress agents. In a fraction of untreated pbs2 cells, Yap2 is nuclear. Zrc1 co-immunoprecipitates with Rck2, and ZRC1 is genetically downstream of RCK2. These data connect activation of the Hog1 MAPK cascade with effectors having a role in oxidative stress resistance.

Ämnesord

NATURVETENSKAP  -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)

Nyckelord

Animals

Cation Transport Proteins/genetics/metabolism

Cell Nucleus/metabolism

Metals/metabolism

Mitogen-Activated Protein Kinase Kinases/metabolism

Mitogen-Activated Protein Kinases/genetics/*metabolism

*Oxidative Stress

Phosphorylation

Protein-Serine-Threonine Kinases/genetics/*metabolism

Saccharomyces cerevisiae/cytology/genetics/metabolism

Saccharomyces cerevisiae Proteins/genetics/*metabolism

Signal Transduction/*physiology

Transcription Factors/metabolism

Two-Hybrid System Techniques

tert-Butylhydroperoxide/metabolism

Publikations- och innehållstyp

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