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J. Biol. Chem., Vol. 275, Issue 52, 40961-40966, December 29, 2000
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From the a Howard Hughes Medical Institute, Department of
Biochemistry and Molecular Biology, The Pennsylvania State University,
University Park, Pennsylvania 16802-4500, the d Division of
Molecular Biology and Genetics, Department of Oncological Sciences,
University of Utah Health Sciences Center, Salt Lake City, Utah 84132, the f Department of Microbiology, Columbia University, New York,
New York 10032, the g Department of Microbiology, University of
Innsbruck-Medical School, Innsbruck A-6020, Austria, and the
i Department of Molecular Biology, University of Geneva, 30 quai
Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
SDS3 (suppressor of defective
silencing 3) was originally identified in a screen for mutations that
cause increased silencing of a crippled HMR silencer in a
rap1 mutant background. In addition, sds3
mutants have phenotypes very similar to those seen in sin3 and rpd3 mutants, suggesting that it functions in the same
genetic pathway. In this manuscript we demonstrate that Sds3p is an
integral subunit of a previously identified high molecular weight
Rpd3p·Sin3p containing yeast histone deacetylase complex. By
analyzing an sds3
Sds3 (Suppressor of Defective Silencing 3) Is an Integral
Component of the Yeast Sin3·Rpd3 Histone Deacetylase Complex and Is
Required for Histone Deacetylase Activity*
strain we show that, in the absence of
Sds3p, Sin3p can be chromatographically separated from Rpd3p,
indicating that Sds3p promotes the integrity of the complex. Moreover,
the remaining Rpd3p complex in the sds3
strain had
little or no histone deacetylase activity. Thus, Sds3p plays important
roles in the integrity and catalytic activity of the Rpd3p·Sin3p complex.
*
This work was supported in part by a grant from the National
Institute of General Medical Sciences (to J. L. W.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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