Yap1 activation by H2O2 or thiol-reactive chemicals elicits distinct adaptive gene responses.
The yeast Saccharomyces cerevisiae transcription factor Yap1 mediates an adaptive response to oxidative stress by regulating protective genes. H(2)O(2) activates Yap1 through the Gpx3-mediated formation of a Yap1 Cys303-Cys598 intramolecular disulfide bond. Thiol-reactive electrophiles can activate Yap1 directly by adduction to cysteine residues in the C-terminal domain containing Cys598, Cys620, and Cys629. H(2)O(2) and N-ethylmaleimide (NEM) showed no cross-protection against each other, whereas another thiol-reactive chemical, acrolein, elicited Yap1-dependent cross-protection against NEM, but not H(2)O(2). Either Cys620 or Cys629 was sufficient for activation of Yap1 by NEM or acrolein; Cys598 was dispensable for this activation mechanism. To determine whether Yap1 activated by H(2)O(2) or thiol-reactive chemicals elicits distinct adaptive gene responses, microarray analysis was performed on the wild-type strain or its isogenic single-deletion strain Δyap1 treated with control buffer, H(2)O(2), NEM, or acrolein. Sixty-five unique H(2)O(2) and 327 NEM and acrolein Yap1-dependent responsive genes were identified. Functional analysis using single-gene-deletion yeast strains demonstrated that protection was conferred by CTA1 and CTT1 in the H(2)O(2)-responsive subset and YDR042C in the NEM- and acrolein-responsive subset. These findings demonstrate that the distinct mechanisms of Yap1 activation by H(2)O(2) or thiol-reactive chemicals result in selective expression of protective genes.
Department of Biological Sciences and W. Harry Feinstone Center for Genomic Research, University of Memphis, Memphis, TN 38152-3560, USA.
Xiaoguang
X
Ouyang
Quynh T
QT
Tran
Shirlean
S
Goodwin
Ryan S
RS
Wible
Carrie Hayes
CH
Sutter
Thomas R
TR
Sutter
D000171:Acrolein / Q000494:pharmacology; D000220:Adaptation, Biological / Q000187:drug effects* / Q000235:genetics*; D019610:Cytoprotection / Q000187:drug effects / Q000235:genetics; D005033:Ethylmaleimide / Q000494:pharmacology; D020869:Gene Expression Profiling; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D046228:Microarray Analysis; D008954:Models, Biological; D030781:Organisms, Genetically Modified; D018384:Oxidative Stress / Q000187:drug effects / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism; D013438:Sulfhydryl Compounds / Q000378:metabolism / Q000494:pharmacology*; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D015533:Transcriptional Activation / Q000187:drug effects
D029701:Saccharomyces cerevisiae Proteins; D013438:Sulfhydryl Compounds; D014157:Transcription Factors; C086677:YAP1 protein, S cerevisiae; D000171:Acrolein; D006861:Hydrogen Peroxide; D005033:Ethylmaleimide