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
中科院分区:
文献类型:
--
作者:
Zierhut C;Jenness C;Kimura H;Funabiki H
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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