A Polycomb repressive complex is required for RNAi-mediated heterochromatin formation and dynamic distribution of nuclear bodies.

A Polycomb repressive complex is required for RNAi-mediated heterochromatin formation and dynamic distribution of nuclear bodies.
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RNAi 介导的异染色质形成和核体的动态分布需要 Polycomb 抑制复合物。

DOI:
10.1093/nar/gkaa1262
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发表时间:
2021-06-04
影响因子:
14.9
通讯作者:
Liu Y
Liu Y
中科院分区:
生物学2区
文献类型:
--
作者:
Xu J;Zhao X;Mao F;Basrur V;Ueberheide B;Chait BT;Allis CD;Taverna SD;Gao S;Wang W;Liu Y

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多梳族 (PcG) 蛋白广泛用于真核生物中的转录抑制。在这里,我们表征了原生生物嗜热四膜虫的 EZL1(E(z) 样 1)复合物,其成分在后生动物多梳抑制复合物 1 和 2(PRC1 和 PRC2)中保守。 EZL1 复合体是组蛋白 H3 K27 和 K9 甲基化、异染色质形成、转座元件控制和程序化基因组重排所必需的。 EZL1 复合物与 EMA1 相互作用,EMA1 是 RNA 干扰 (RNAi) 所需的解旋酶。这种相互作用与 EZL1 复合物的共转录招募有关。 PDD1(另一种与 EZL1 复合物相互作用的 PcG 蛋白)与 H3K27 和 H3K9 甲基化的结合增强了其染色质关联。 EZL1 复合体是多梳体的一个组成部分,在四膜虫发育中表现出动态分布:它们的分散是由染色质缔合驱动的,而它们的聚结是由 PDD1 驱动的,可能是通过相分离。我们的结果提供了一种连接 RNAi 和 Polycomb 抑制的分子机制,它协调调节核体并重组基因组。
Polycomb group (PcG) proteins are widely utilized for transcriptional repression in eukaryotes. Here, we characterize, in the protist Tetrahymena thermophila, the EZL1 (E(z)-like 1) complex, with components conserved in metazoan Polycomb Repressive Complexes 1 and 2 (PRC1 and PRC2). The EZL1 complex is required for histone H3 K27 and K9 methylation, heterochromatin formation, transposable element control, and programmed genome rearrangement. The EZL1 complex interacts with EMA1, a helicase required for RNA interference (RNAi). This interaction is implicated in co-transcriptional recruitment of the EZL1 complex. Binding of H3K27 and H3K9 methylation by PDD1—another PcG protein interacting with the EZL1 complex—reinforces its chromatin association. The EZL1 complex is an integral part of Polycomb bodies, which exhibit dynamic distribution in Tetrahymena development: Their dispersion is driven by chromatin association, while their coalescence by PDD1, likely via phase separation. Our results provide a molecular mechanism connecting RNAi and Polycomb repression, which coordinately regulate nuclear bodies and reorganize the genome.
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发表时间: 2014-07-17
期刊: MOLECULAR CELL
影响因子: 16
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