Recruitment of the NuA4 complex poises the PHO5 promoter for chromatin remodeling and activation.
The remodeling of the promoter chromatin structure is a key event for the induction of the PHO5 gene. Two DNA-binding proteins Pho2 and Pho4 are critical for this step. We found that the NuA4 histone acetyltransferase complex is essential for PHO5 transcriptional induction without affecting Pho4 translocation upon phosphate starvation. Our data also indicate that NuA4 is critical for the chromatin remodeling event that occurs over the PHO5 promoter prior to activation. Using Chromatin IP analysis, we found that Esa1-dependent histone H4 acetylation at the PHO5 promoter correlates with specific recruitment of the NuA4 complex to this locus under repressing conditions. We demonstrate that the homeodomain transcriptional activator Pho2 is responsible for this recruitment in vivo and interacts directly with the NuA4 complex. Finally, we show that Pho4 is unable to bind the PHO5 promoter without prior action of NuA4. These results indicate that, before induction, NuA4 complex recruitment by Pho2 is an essential event that presets the PHO5 promoter for subsequent binding by Pho4, chromatin remodeling and transcription.
Nourani
Amine
A
Laval University Cancer Research Center, Hôtel-Dieu de Québec (CHUQ), Quebec City, Canada.
Utley
Rhea T
RT
Allard
Stéphane
S
Côté
Jacques
J
D000107:Acetylation; D000123:Acetyltransferases / Q000235:genetics / Q000378:metabolism*; D000135:Acid Phosphatase; D002467:Cell Nucleus / Q000378:metabolism; D002843:Chromatin / Q000378:metabolism*; D047369:Chromatin Immunoprecipitation; D004268:DNA-Binding Proteins / Q000378:metabolism; D004789:Enzyme Activation; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D051548:Histone Acetyltransferases; D006657:Histones / Q000378:metabolism; D018398:Homeodomain Proteins / Q000378:metabolism; D009154:Mutation; D011401:Promoter Regions, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism*; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism
D002843:Chromatin; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D006657:Histones; D018398:Homeodomain Proteins; C051611:PHO2 protein, S cerevisiae; C060292:PHO4 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; C477280:YAF9 protein, S cerevisiae; D000123:Acetyltransferases; C496551:Esa1 protein, S cerevisiae; D051548:Histone Acetyltransferases; D000135:Acid Phosphatase; C488916:PHO5 protein, S cerevisiae