Multisite Substrate Recognition in Asf1-Dependent Acetylation of Histone H3 K56 by Rtt109.

Multisite Substrate Recognition in Asf1-Dependent Acetylation of Histone H3 K56 by Rtt109.
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Rtt109 对 Asf1 依赖性组蛋白 H3 K56 乙酰化的多位点底物识别

DOI:
10.1016/j.cell.2018.07.005
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发表时间:
2018-08-09
期刊:
影响因子:
64.5
通讯作者:
Xu RM
Xu RM
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang L;Serra-Cardona A;Zhou H;Wang M;Yang N;Zhang Z;Xu RM

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Rtt 109是一种独特的组蛋白乙酰转移酶,乙酰化组蛋白H3赖氨酸56(H3 K56),这是DNA复制偶联核小体组装和基因组稳定性的关键修饰。在细胞中,组蛋白伴侣蛋白Asf 1是H3 K56乙酰化所必需的,但H3 K56特异性和Asf 1需求的机制仍然未知。我们已经确定了Rtt 109-Asf 1-H3-H4复合物的晶体结构,并发现组蛋白H3 αN(K56通常位于其中)的解旋以及Asf 1对组蛋白H4的C端β链的稳定是H3 K56乙酰化的先决条件。出乎意料的是,Rtt 109和组蛋白H3的中心螺旋之间的相互作用也是必需的。观察到的多蛋白,多位点底物识别机制之间的组蛋白修饰酶提供了机制的理解Rtt 109和Asf 1在H3 K56乙酰化,以及有价值的见解底物识别组蛋白修饰酶一般。作为组蛋白修饰酶的完整底物的组蛋白伴侣Asf 1和H3和H4的多蛋白复合物
Rtt109 is a unique histone acetyltransferase acetylating histone H3 lysine 56 (H3K56), a modification critical for DNA replication-coupled nucleosome assembly and genome stability. In cells, histone chaperone Asf1 is essential for H3K56 acetylation, yet the mechanisms for H3K56 specificity and Asf1 requirement remain unknown. We have determined the crystal structure of the Rtt109-Asf1-H3-H4 complex, and found that unwinding of histone H3 αN, where K56 is normally located, and stabilization of the very C-terminal β-strand of histone H4 by Asf1 are prerequisites for H3K56 acetylation. Unexpectedly, an interaction between Rtt109 and the central helix of histone H3 is also required. The observed multiprotein, multisite substrate recognition mechanism among histone modification enzymes provides mechanistic understandings of Rtt109 and Asf1 in H3K56 acetylation, as well as valuable insights into substrate recognition by histone modification enzymes in general. A multiprotein complex of histone chaperone Asf1 and H3 and H4 as an intact substrate for a histone-modifying enzyme
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