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J Biol Chem. 2003 Aug 15;278(33):30896-904. Epub 2003 May 12.

Ybp1 is required for the hydrogen peroxide-induced oxidation of the Yap1 transcription factor.

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  • 1School of Cell and Molecular Biosciences, Faculty of Medical Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NE2 4HH, United Kingdom.

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  • J Biol Chem. 2004 Nov 19;279(47):49562.


We describe the characterization of Ybp1, a novel protein, in Saccharomyces cerevisiae, that is required for the oxidative stress response to peroxides. Ybp1 is required for H2O2-induced expression of the antioxidant encoding gene TRX2. Our data indicate that the effects of Ybp1 are mediated through the Yap1 transcription factor. Indeed, Ybp1 forms a stress-induced complex with Yap1 in vivo and stimulates the nuclear accumulation of Yap1 in response to H2O2 but not in response to the thiol-oxidizing agent diamide. The H2O2-induced nuclear accumulation of Yap1 is regulated by the oxidation of specific cysteine residues and is dependent on the thiol peroxidase Gpx3. Our data suggest that Ybp1 is required for the H2O2-induced oxidation of Yap1 and acts in the same pathway as Gpx3. Consequently, Ybp1 represents a novel class of stress regulator of Yap1. These data have important implications for the regulation of protein oxidation and stress responses in eukaryotes.

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