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PMID: 17573544 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Activation of the ADE genes requires the chromatin remodeling complexes SAGA and SWI/SNF.

Eukaryotic cell ·Vol. 6 ·No. 8 ·2007-08-00 ·Pages 1474-85

Koehler RN, Rachfall N, Rolfes RJ

Abstract

The activation of the ADE regulon genes requires the pair of transcription factors Bas1 and Pho2. In a genome-wide screen for additional regulators of the pathway, strains with mutations in multiple subunits of the chromatin remodeling complexes SAGA and SWI/SNF were uncovered. These mutants exhibited decreased expression of an ADE5,7-lacZ reporter and native ADE compared to the wild-type strains, but the expression of the BAS1 and PHO2 genes was not substantially decreased. An unregulated Bas1-Pho2 fusion protein depended upon SAGA and SWI/SNF activity to promote transcription of a reporter. A significant but low-level association of Gcn5-myc and Snf2-myc with the ADE5,7 promoter was independent of adenine growth conditions and independent of the presence of the activator proteins Bas1 and Pho2. However, the increase in occupancy of Bas1 and Pho2 at ADE5,7 depended on both SAGA and SWI/SNF. The loss of catalytic activity of both SAGA and SWI/SNF complexes in the gcn5Delta snf2Delta double mutant was severely detrimental to ADE-lacZ reporter expression and native ADE gene expression, indicating complementary roles for these complexes. We conclude that Bas1 and Pho2 do not recruit the SAGA and SWI/SNF complexes to the ADE5,7 promoter but that the remodeling complexes are necessary to increase the binding of Bas1 and Pho2 in response to the adenine regulatory signal. Our data support the model that the SAGA and SWI/SNF complexes engage in global surveillance that is necessary for the specific response by Bas1 and Pho2.

MeSH Terms
Adenine/analogs & derivatives,pharmacology Chromatin Assembly and Disassembly Gene Expression Regulation, Fungal Nuclear Proteins/genetics,physiology Saccharomyces cerevisiae/genetics,physiology Saccharomyces cerevisiae Proteins/genetics,physiology Signal Transduction Trans-Activators/genetics,physiology Up-Regulation
Chemicals
Nuclear Proteins SAGA complex, S cerevisiae SWI3 protein, S cerevisiae Saccharomyces cerevisiae Proteins Trans-Activators Adenine
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Koehler Rebecca N
Department of Biology, Georgetown University, Washington, DC 20057-1229, USA.
Rachfall Nicole
Rolfes Ronda J
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Article Info
Journal
Eukaryotic cell
Abbr.
Eukaryot Cell
ISSN
1535-9778
DOI
10.1128/EC.00068-07
Published
2007-08-00
Epub
2007-00-15
Pages
1474-85
Language
English
Region
United States
NLM ID
101130731
PMCID
PMC1951130
Subset
IM
External Links
PubMed source DOI: 10.1128/EC.00068-07 PMC Full Text View journal details
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