DNA methyltransferase 3b preferentially associates with condensed chromatin.

DNA methyltransferase 3b preferentially associates with condensed chromatin.
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DOI:
10.1093/nar/gkq870
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发表时间:
2011-02
影响因子:
14.9
通讯作者:
Kaneda Y
Kaneda Y
中科院分区:
生物学2区
文献类型:
--
作者:
Kashiwagi K;Nimura K;Ura K;Kaneda Y

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在哺乳动物中,DNA 甲基化由 Dnmt1、Dnmt3a 和 Dnmt3b 编码的 DNA 甲基转移酶 (DNMT) 催化。由于 Dnmts 的调节机制仍然很大程度上未知,因此在体内和体外研究了 Dnmt3b 和染色质之间的物理相互作用。在胚胎干细胞核中,Dnmt3b 优先与含有组蛋白 H1 的异染色质相关,但沉默特异性组蛋白甲基化没有任何显着富集。重组 Dnmt3b 优先与核小体 DNA 而非裸露 DNA 结合。将组蛋白 H1 掺入核小体阵列促进了 Dnmt3b 与染色质的结合,而组蛋白乙酰化则减少了 Dnmt3b 的体外结合。此外,Dnmt3b 与核酸酶抗性染色质中的组蛋白脱乙酰酶 SirT1 相关。这些发现表明 Dnmt3b 优先被招募到低乙酰化和浓缩的染色质中。我们认为 Dnmt3b 是高阶染色质结构的“阅读器”,通过 DNA 甲基化导致基因沉默。
In mammals, DNA methylation is catalyzed by DNA methyltransferases (DNMTs) encoded by Dnmt1, Dnmt3a and Dnmt3b. Since, the mechanisms of regulation of Dnmts are still largely unknown, the physical interaction between Dnmt3b and chromatin was investigated in vivo and in vitro. In embryonic stem cell nuclei, Dnmt3b preferentially associated with histone H1-containing heterochromatin without any significant enrichment of silent-specific histone methylation. Recombinant Dnmt3b preferentially associated with nucleosomal DNA rather than naked DNA. Incorporation of histone H1 into nucleosomal arrays promoted the association of Dnmt3b with chromatin, whereas histone acetylation reduced Dnmt3b binding in vitro. In addition, Dnmt3b associated with histone deacetylase SirT1 in the nuclease resistant chromatin. These findings suggest that Dnmt3b is preferentially recruited into hypoacetylated and condensed chromatin. We propose that Dnmt3b is a ‘reader’ of higher-order chromatin structure leading to gene silencing through DNA methylation.
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