SWR1 complex poises heterochromatin boundaries for antisilencing activity propagation.

In eukaryotes, chromosomal processes are usually modulated through chromatin-modifying complexes that are dynamically targeted to specific regions of chromatin. In this study, we show that the chromatin-remodeling complex SWR1 (SWR1-C) uses a distinct strategy to regulate heterochromatin spreading. Swr1 binds in a stable manner near heterochromatin to prepare specific chromosomal ...
regions for H2A.Z deposition, which can be triggered by NuA4-mediated acetylation of histone H4. We also demonstrate through experiments with Swc4, a module shared by NuA4 and SWR1-C, that the coupled actions of NuA4 and SWR1-C lead to the efficient incorporation of H2A.Z into chromatin and thereby synergize heterochromatin boundary activity. Our results support a model where SWR1-C resides at the heterochromatin boundary to maintain and amplify antisilencing activity of histone H4 acetylation through incorporating H2A.Z into chromatin.
Mesh Terms:
Adenosine Triphosphatases, Gene Expression Regulation, Fungal, Gene Silencing, Heterochromatin, Histones, Models, Genetic, Protein Subunits, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins
Mol. Cell. Biol.
Date: May. 01, 2010
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