Acetylation of histone H4 lysine 5 and 12 is required for CENP-A deposition into centromeres.

Acetylation of histone H4 lysine 5 and 12 is required for CENP-A deposition into centromeres.
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DOI:
10.1038/ncomms13465
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发表时间:
2016-11-04
影响因子:
16.6
通讯作者:
Fukagawa, Tatsuo
Fukagawa, Tatsuo
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Shang, Wei-Hao;Hori, Tetsuya;Westhorpe, Frederick G.;Godek, Kristina M.;Toyoda, Atsushi;Misu, Sadahiko;Monma, Norikazu;Ikeo, Kazuho;Carroll, Christopher W.;Takami, Yasunari;Fujiyama, Asao;Kimura, Hiroshi;Straight, Aaron F.;Fukagawa, Tatsuo

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着丝粒通过着丝粒特异性组蛋白 H3 变体 CENP-A 的沉积在表观遗传学上被指定。然而,其他表观遗传特征如何参与着丝粒规范尚不清楚。在这里,我们发现组蛋白 H4 Lys5 和 Lys12 乙酰化(H4K5ac 和 H4K12ac)主要发生在核小体前 CENP-A–H4–HJURP(CENP-A 分子伴侣)复合物中,在着丝粒沉积之前。我们发现 H4K5ac 和 H4K12ac 由 RbAp46/48-Hat1 复合物介导,并且 RbAp48 缺陷的 DT40 细胞无法将 HJURP 招募到着丝粒,并且不会在着丝粒处整合新的 CENP-A。然而,C 端截短的 HJURP 不结合 CENP-A,但确实定位于 RbAp48 缺陷细胞中的着丝粒。乙酰化死亡 H4 突变导致 CENP-A-H4 复合物错误定位到非着丝粒染色质。至关重要的是,即使在 RbAp48 缺陷的 DT40 细胞中,具有乙酰化模拟 H4 的 CENP-A 也能特异性地组装到着丝粒中。我们得出结论,RbAp46/48 介导的 H4K5ac 和 H4K12ac 促进 CENP-A 有效沉积到着丝粒中。 与组蛋白 H4 结合的组蛋白 H3 变体 CENP-A 的沉积是指定染色体着丝粒区域的关键特征。在这里,作者表明,由 RbAp46/48-Hat1 复合物介导的组蛋白 H4 中残基 K5 和 K12 的乙酰化是 CENP-A-H4 沉积到着丝粒中所必需的。
Centromeres are specified epigenetically through the deposition of the centromere-specific histone H3 variant CENP-A. However, how additional epigenetic features are involved in centromere specification is unknown. Here, we find that histone H4 Lys5 and Lys12 acetylation (H4K5ac and H4K12ac) primarily occur within the pre-nucleosomal CENP-A–H4–HJURP (CENP-A chaperone) complex, before centromere deposition. We show that H4K5ac and H4K12ac are mediated by the RbAp46/48–Hat1 complex and that RbAp48-deficient DT40 cells fail to recruit HJURP to centromeres and do not incorporate new CENP-A at centromeres. However, C-terminally-truncated HJURP, that does not bind CENP-A, does localize to centromeres in RbAp48-deficient cells. Acetylation-dead H4 mutations cause mis-localization of the CENP-A–H4 complex to non-centromeric chromatin. Crucially, CENP-A with acetylation-mimetic H4 was assembled specifically into centromeres even in RbAp48-deficient DT40 cells. We conclude that H4K5ac and H4K12ac, mediated by RbAp46/48, facilitates efficient CENP-A deposition into centromeres. The deposition of histone H3 variant CENP-A bound with histone H4 is a key feature designating the centromere region of a chromosome. Here the authors show acetylation on residues K5 and K12 in histone H4, mediated by the RbAp46/48-Hat1 complex, is required for deposition of CENP-A-H4 into centromeres.
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