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  • Title: SWR1 complex poises heterochromatin boundaries for antisilencing activity propagation.
    Author: Zhou BO, Wang SS, Xu LX, Meng FL, Xuan YJ, Duan YM, Wang JY, Hu H, Dong X, Ding J, Zhou JQ.
    Journal: Mol Cell Biol; 2010 May; 30(10):2391-400. PubMed ID: 20308321.
    Abstract:
    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.
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