MacroH2A allows ATP-dependent chromatin remodeling by SWI/SNF and ACF complexes but specifically reduces recruitment of SWI/SNF.

MacroH2A allows ATP-dependent chromatin remodeling by SWI/SNF and ACF complexes but specifically reduces recruitment of SWI/SNF.
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DOI:
10.1021/bi8016944
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发表时间:
2008-12-23
期刊:
影响因子:
2.9
通讯作者:
Narlikar, Geeta J.
Narlikar, Geeta J.
中科院分区:
生物学3区
文献类型:
--
作者:
Chang, Evelyn Y.;Ferreira, Helder;Somers, Joanna;Nusinow, Dmitri A.;Owen-Hughes, Tom;Narlikar, Geeta J.

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变体组蛋白macroH 2A有助于维持X失活和基因沉默。以前的工作表明,含有macroH 2A的核小体不能被ISWI和SWI/SNF染色质重塑酶重塑。使用防止macroH 2A核小体错误组装的方法,我们发现macroH 2A核小体是两种酶家族的优良底物。有趣的是,SWI/SNF,这是参与基因激活,优先结合H2 A核小体macroH 2A核小体,但ACF,一个ISWI复合物参与基因阻遏,显示没有偏好。因此,macroH 2A可能有助于调节激活和抑制重塑复合物之间的平衡。
The variant histone macroH2A helps maintain X inactivation and gene silencing. Previous work implied that nucleosomes containing macroH2A cannot be remodeled by ISWI and SWI/SNF chromatin remodeling enzymes. Using approaches that prevent misassembly of macroH2A nucleosomes, we find that macroH2A nucleosomes are excellent substrates for both enzyme families. Interestingly, SWI/SNF, which is involved in gene activation, preferentially binds H2A nucleosomes over macroH2A nucleosomes, but ACF, an ISWI complex implicated in gene repression, shows no preference. Thus, macroH2A may help regulate the balance between activating and repressive remodeling complexes.
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