SWR1 Complex Poises Heterochromatin Boundaries for Antisilencing Activity Propagation
SWR1 Complex Poises Heterochromatin Boundaries for Antisilencing Activity Propagation
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SWR1复合体平衡异染色质边界以实现抗沉默活性传播
DOI:
10.1128/mcb.01106-09
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发表时间:
2010-03
影响因子:
5.3
通讯作者:
Dong, Xianchi
中科院分区:
文献类型:
--
作者:
Zhou, Bo O.;Ding, Jianping;Zhou, Jin-Qiu;Wang, Shan-Shan;Xu, Lu-Xia;Meng, Fei-Long;Xuan, Yao-Ji;Duan, Yi-Min;Wang, Jian-Yong;Hu, Hao;Dong, Xianchi
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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