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Title: Transcriptional activation of metalloid tolerance genes in Saccharomyces cerevisiae requires the AP-1-like proteins Yap1p and Yap8p
Authors: Wysocki, Robert ×
Fortier, Pierre-Karl
Maciaszczyk, Ewa
Thorsen, Michael
Leduc, Anick
Odhagen, Asa
Owsianik, Grzegorz
Ulaszewski, Stanislaw
Ramotar, Dindial
Tamás, Markus J #
Issue Date: Apr-2004
Series Title: Molecular biology of the cell. vol:15 issue:5 pages:2049-60
Abstract: All organisms are equipped with systems for detoxification of the metalloids arsenic and antimony. Here, we show that two parallel pathways involving the AP-1-like proteins Yap1p and Yap8p are required for acquisition of metalloid tolerance in the budding yeast S. cerevisiae. Yap8p is demonstrated to reside in the nucleus where it mediates enhanced expression of the arsenic detoxification genes ACR2 and ACR3. Using chromatin immunoprecipitation assays, we show that Yap8p is associated with the ACR3 promoter in untreated as well as arsenic-exposed cells. Like for Yap1p, specific cysteine residues are critical for Yap8p function. We further show that metalloid exposure triggers nuclear accumulation of Yap1p and stimulates expression of antioxidant genes. Yap1p mutants that are unable to accumulate in the nucleus during H(2)O(2) treatment showed nearly normal nuclear retention in response to metalloid exposure. Thus, our data are the first to demonstrate that Yap1p is being regulated by metalloid stress and to indicate that this activation of Yap1p operates in a manner distinct from stress caused by chemical oxidants. We conclude that Yap1p and Yap8p mediate tolerance by controlling separate subsets of detoxification genes and propose that the two AP-1-like proteins respond to metalloids through distinct mechanisms.
URI: 
ISSN: 1059-1524
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Ion Channel Research
× corresponding author
# (joint) last author

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