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Molecular and Cellular Biology, February 2002, p. 693-703, Vol. 22, No. 3
0270-7306/01/$04.00+0     DOI: 10.1128/MCB.22.3.693-703.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Histone-Dependent Association of Tup1-Ssn6 with Repressed Genes In Vivo

Judith K. Davie,1 Robert J. Trumbly,2 and Sharon Y. R. Dent1*

Department of Biochemistry and Molecular Biology, University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030,1 Department of Biochemistry and Molecular Biology, Medical College of Ohio, Toledo, Ohio 436142

Received 26 July 2001/ Returned for modification 10 September 2001/ Accepted 9 November 2001

The Tup1-Ssn6 complex regulates diverse classes of genes in Saccharomyces cerevisiae and serves as a model for corepressor functions in many organisms. Tup1-Ssn6 does not directly bind DNA but is brought to target genes through interactions with sequence-specific DNA binding factors. Full repression by Tup1-Ssn6 appears to require interactions with both the histone tails and components of the general transcription machinery, although the relative contribution of these two pathways is not clear. Here, we map Tup1 locations on two classes of Tup1-Ssn6-regulated genes in vivo via chromatin immunoprecipitations. Distinct profiles of Tup1 are observed on a cell-specific genes and DNA damage-inducible genes, suggesting that alternate repressive architectures may be created on different classes of repressed genes. In both cases, decreases in acetylation of histone H3 colocalize with Tup1. Strikingly, although loss of the Srb10 mediator protein had no effect on Tup1 localization, both histone tail mutations and histone deacetylase mutations crippled the association of Tup1 with target loci. Together with previous findings that Tup1-Ssn6 physically associates with histone deacetylase activities, these results indicate that the repressor complex alters histone modification states to facilitate interactions with histones and that these interactions are required to maintain a stable repressive state.

* Corresponding author. Mailing address: Department of Biochemistry and Molecular Biology, Box 117, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030. Phone: (713) 794-4908. Fax: (713) 794-5068. E-mail: syr{at}mdacc.tmc.edu.

Molecular and Cellular Biology, February 2002, p. 693-703, Vol. 22, No. 3
0022-538X/01/$04.00+0     DOI: 10.1128/MCB.22.3.693-703.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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