A comprehensive library of histone mutants identifies nucleosomal residues required for H3K4 methylation.

A comprehensive library of histone mutants identifies nucleosomal residues required for H3K4 methylation.
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DOI:
10.1038/nsmb.1454
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发表时间:
2008-08
影响因子:
16.8
通讯作者:
Shilatifard, Ali
Shilatifard, Ali
中科院分区:
生物学1区
文献类型:
--
作者:
Nakanishi, Shima;Sanderson, Brian W.;Delventhal, Kym M.;Bradford, William D.;Staehling-Hampton, Karen;Shilatifard, Ali

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组蛋白3赖氨酸4(H3K4)在酵母Set1-COMPASS作用下的甲基化需要组蛋白H 2B的单素化。为了确定组蛋白中的其他残基是否也是H3K4甲基化所必需的,我们系统地构建了酿酒酵母中四个核心组蛋白所有残基的丙氨酸取代的完整文库。从这项研究中,我们发现四个组蛋白中的18个残基是在完整的生长介质中生存所必需的。我们还在组蛋白H3N末端尾部发现了几个顺式调节残基,包括组蛋白H3赖氨酸14(H3K14),这是正常水平的H3K4三甲基化所必需的。组蛋白H_2A和H_2B上的几个以前未知的反式调节残基在核小体上形成了一个补丁,是COMPASS介导的甲基化所必需的。这个文库将是一个有价值的工具,用于确定组蛋白残基在需要染色质的过程中的作用。
Methylation of histone 3 lysine 4 (H3K4) by yeast Set1-COMPASS requires prior monoubiquitination of histone H2B. To define whether other residues within the histones are also required for H3K4 methylation, we systematically generated a complete library of the alanine substitutions of all of the residues of the four core histones in Saccharomyces cerevisiae. From this study we discovered that 18 residues within the four histones are essential for viability on complete growth media. We also identified several cis-regulatory residues on the histone H3 N-terminal tail, including histone H3 lysine 14 (H3K14), which are required for normal levels of H3K4 trimethylation. Several previously uncharacterized trans-regulatory residues on histones H2A and H2B form a patch on nucleosomes and are required for methylation mediated by COMPASS. This library will be a valuable tool for defining the role of histone residues in processes requiring chromatin.
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