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Mol. Cell. Biol., Aug 1997, 4852-4858, Vol 17, No. 8
MM Kasten, S Dorland and DJ Stillman
The SIN3 gene is required for the transcriptional repression of diverse
genes in Saccharomyces cerevisiae. Sin3p does not bind directly to DNA but
is thought to be targeted to promoters by interacting with sequence-
specific DNA-binding proteins. We show here that Sin3p is present in a
large multiprotein complex with an apparent molecular mass, estimated by
gel filtration chromatography, of greater than 2 million Da. Genetic
studies have shown that the yeast RPD3 gene has a function similar to that
of SIN3 in transcriptional regulation, as SIN3 and RPD3 negatively regulate
the same set of genes. The SIN3 and RPD3 genes are conserved from yeasts to
mammals, and recent work suggests that RPD3 may encode a histone
deacetylase. We show that Rpd3p is present in the Sin3p complex and that an
rpd3 mutation eliminates SIN3-dependent repression. Thus, Sin3p may
function as a bridge to recruit the Rpd3p histone deacetylase to specific
promoters.
Copyright © 1997, American Society for Microbiology
A large protein complex containing the yeast Sin3p and Rpd3p transcriptional regulators
Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah Health Sciences Center, Salt Lake City 84132, USA.
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