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PMID: 9321405 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

Interplay of yeast global transcriptional regulators Ssn6p-Tup1p and Swi-Snf and their effect on chromatin structure.

The EMBO journal ·Vol. 16 ·No. 20 ·1997-10-15 ·Pages 6263-71

Gavin IM, Simpson RT

Abstract

Transcriptional regulation in yeast involves a number of general trans-acting factors affecting chromatin structure. The Swi-Snf complex is required for expression of a large number of genes and has the ability to remodel chromatin in vitro. The Ssn6p-Tup1p repressor complex may be involved in chromatin organization through the interaction with pathway-specific DNA-binding proteins. To study the interplay of these factors and their effect on chromatin we have analyzed SUC2 chromatin structure in wild-type cells and in strains bearing combinations of ssn6/tup1 and swi1 mutations. We have mapped nucleosome positioning of the repressed gene in wild-type cells using primer extension methodology, allowing base pair resolution, and have analyzed details of chromatin remodeling in the derepressed state. In ssn6 or tup1 mutants under repressing conditions the observed changes in SUC2 chromatin structure may be suppressed by the swi1 mutation, suggesting that Ssn6p-Tup1p is not required for the establishment of nucleosome positioning at the SUC2 promoter. Our data indicate the involvement of chromatin remodeling factors distinct from the Swi-Snf complex in SUC2 transcriptional regulation and suggest that Swi-Snf may antagonize Ssn6p-Tup1p by controlling remodeling activity. We also show that a relatively high level of SUC2 transcription can coexist with positioned nucleosomes.

MeSH Terms
Chromatin/metabolism,ultrastructure Chromosomal Proteins, Non-Histone DNA Footprinting DNA-Binding Proteins/metabolism Fungal Proteins/metabolism Gene Expression Regulation, Fungal Glycoside Hydrolases/genetics Nuclear Proteins Promoter Regions, Genetic Repressor Proteins Saccharomyces cerevisiae/genetics Saccharomyces cerevisiae Proteins Transcription Factors/metabolism Transcription, Genetic beta-Fructofuranosidase
Chemicals
CYC8 protein, S cerevisiae Chromatin Chromosomal Proteins, Non-Histone DNA-Binding Proteins Fungal Proteins Nuclear Proteins Repressor Proteins SWI1 protein, S cerevisiae Saccharomyces cerevisiae Proteins TUP1 protein, S cerevisiae Transcription Factors Glycoside Hydrolases beta-Fructofuranosidase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Gavin I M
Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA.
Simpson R T
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Article Info
Journal
The EMBO journal
Abbr.
EMBO J
ISSN
0261-4189
DOI
10.1093/emboj/16.20.6263
Published
1997-10-15
Pages
6263-71
Language
English
Region
England
NLM ID
8208664
PMCID
PMC1326310
Subset
IM
Grants
NIGMS NIH HHS · GM52311 · United States
External Links
PubMed source DOI: 10.1093/emboj/16.20.6263 PMC Full Text View journal details
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