Nucleosomal regulation of chromatin composition and nuclear assembly revealed by histone depletion.

Nucleosomal regulation of chromatin composition and nuclear assembly revealed by histone depletion.
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DOI:
10.1038/nsmb.2845
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发表时间:
2014-07
影响因子:
16.8
通讯作者:
Funabiki H
Funabiki H
中科院分区:
生物学1区
文献类型:
--
作者:
Zierhut C;Jenness C;Kimura H;Funabiki H

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核小体是染色质的基本单位,但转录独立的核小体功能的分析一直受到组蛋白操纵导致的混淆基因表达变化的阻碍。在这里,我们解决了这个困境,开发非洲爪蟾卵提取物缺乏核小体形成,并分析蛋白质组景观和行为的核小体染色质和核小体游离DNA。我们表明,虽然核小体的DNA可以招募核膜,核小体所需的纺锤体组装,板和核孔复合物(NPC)的形成。除RCC 1外,我们还发现NPC形成的启动子ELYS不能与裸DNA结合,而是直接与组蛋白H2 A-H2 B和核小体结合。将ELYS和RCC 1拴系到DNA以协同方式绕过了NPC形成中对核小体的要求。因此,核小体在NPC形成中的最小基本功能是募集RCC 1和ELYS。
Nucleosomes are the fundamental unit of chromatin, but the analysis of transcription-independent nucleosome functions has been thwarted by the confounding gene expression changes resultant of histone manipulation. Here we solve this dilemma by developing Xenopus laevis egg extracts deficient for nucleosome formation, and analyze the proteomic landscape and behavior of nucleosomal chromatin and nucleosome-free DNA. We show that while nucleosome-free DNA can recruit nuclear envelope membranes, nucleosomes are required for spindle assembly, lamina and nuclear pore complex (NPC) formation. In addition to RCC1, we reveal that ELYS, the initiator of NPC formation, fails to associate with naked DNA, but directly binds histones H2A–H2B and nucleosomes. Tethering ELYS and RCC1 to DNA bypassed the requirement for nucleosomes in NPC formation in a synergistic manner. Thus, the minimal essential function of nucleosomes in NPC formation is to recruit RCC1 and ELYS.
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