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
Dong, Xianchi
中科院分区:
生物学2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

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摘要在真核生物中,染色体过程通常通过染色质修饰复合物来调节,这些复合物动态地靶向染色质的特定区域。在这项研究中,我们表明,染色质重塑复合物SWR 1(SWR 1-C)使用一种独特的策略来调节异染色质扩散。Swr 1以稳定的方式在异染色质附近结合,为H2 A. Z沉积准备特定的染色体区域,这可以通过NuA 4介导的组蛋白H4的乙酰化来触发。我们还证明,通过实验与Swc 4,NuA 4和SWR 1-C共享的模块,NuA 4和SWR 1-C的耦合作用导致H2A.Z有效地掺入染色质,从而协同异染色质边界活性。我们的研究结果支持了一个模型,SWR 1-C驻留在异染色质边界,以维持和放大组蛋白H4乙酰化的抗沉默活性,通过将H2A.Z纳入染色质。
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.
组蛋白脱乙酰酶 Rpd3 拮抗 Sir2 依赖性沉默染色质增殖。
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