Abstract:
:Ssn6-Tup1 regulates multiple genes in yeast, providing a paradigm for corepressor functions. Tup1 interacts directly with histones H3 and H4, and mutation of these histones synergistically compromises Ssn6-Tup1-mediated repression. In vitro, Tup1 interacts preferentially with underacetylated isoforms of H3 and H4, suggesting that histone acetylation may modulate Tup1 functions in vivo. Here we report that histone hyperacetylation caused by combined mutations in genes encoding the histone deacetylases (HDACs) Rpd3, Hos1, and Hos2 abolishes Ssn6-Tup1 repression. Unlike HDAC mutations that do not affect repression, this combination of mutations causes concomitant hyperacetylation of both H3 and H4. Strikingly, two of these class I HDACs interact physically with Ssn6-Tup1. These findings suggest that Ssn6-Tup1 actively recruits deacetylase activities to deacetylate adjacent nucleosomes and promote Tup1-histone interactions.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Watson AD,Edmondson DG,Bone JR,Mukai Y,Yu Y,Du W,Stillman DJ,Roth SYdoi
10.1101/gad.829100subject
Has Abstractpub_date
2000-11-01 00:00:00pages
2737-44issue
21eissn
0890-9369issn
1549-5477journal_volume
14pub_type
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