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Molecular and Cellular Biology, March 2007, p. 2037-2047, Vol. 27, No. 6
0270-7306/07/$08.00+0     doi:10.1128/MCB.02297-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Direct Role for the Rpd3 Complex in Transcriptional Induction of the Anaerobic DAN/TIR Genes in Yeast^,

Odeniel Sertil,^1* Arvind Vemula,¹ Sharon L. Salmon,¹ Randall H. Morse,² and Charles V. Lowry^1,

Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York 12208,¹ Laboratory of Developmental Genetics, Wadsworth Center, New York State Department of Health, and Department of Biomedical Sciences, State University of New York at Albany, School of Public Health, Albany, New York 12201-2002²

Received 8 December 2006/ Accepted 20 December 2006

Saccharomyces cerevisiae adapts to hypoxia by expressing a large group of "anaerobic" genes. Among these, the eight DAN/TIR genes are regulated by the repressors Rox1 and Mot3 and the activator Upc2/Mox4. In attempting to identify factors recruited by the DNA binding repressor Mot3 to enhance repression of the DAN/TIR genes, we found that the histone deacetylase and global repressor complex, Rpd3-Sin3-Sap30, was not required for repression. Strikingly, the complex was instead required for activation. In addition, the histone H3 and H4 amino termini, which are targets of Rpd3, were also required for DAN1 expression. Epistasis tests demonstrated that the Rpd3 complex is not required in the absence of the repressor Mot3. Furthermore, the Rpd3 complex was required for normal function and stable binding of the activator Upc2 at the DAN1 promoter. Moreover, the Swi/Snf chromatin remodeling complex was strongly required for activation of DAN1, and chromatin immunoprecipitation analysis showed an Rpd3-dependent reduction in DAN1 promoter-associated nucleosomes upon induction. Taken together, these data provide evidence that during anaerobiosis, the Rpd3 complex acts at the DAN1 promoter to antagonize the chromatin-mediated repression caused by Mot3 and Rox1 and that chromatin remodeling by Swi/Snf is necessary for normal expression.

Published ahead of print on 8 January 2007.

We dedicate this paper to our friend and mentor Charles V. Lowry, who is greatly missed.

Deceased.

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