XB-ART-49196
Nat Struct Mol Biol
2014 Jul 01;217:617-25. doi: 10.1038/nsmb.2845.
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Nucleosomal regulation of chromatin composition and nuclear assembly revealed by histone depletion.
Zierhut C
,
Jenness C
,
Kimura H
,
Funabiki H
.
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Nucleosomes are the fundamental unit of chromatin, but analysis of transcription-independent nucleosome functions has been complicated by the gene-expression changes resulting from histone manipulation. Here we solve this dilemma by developing Xenopus laevis egg extracts deficient for nucleosome formation and by analyzing the proteomic landscape and behavior of nucleosomal chromatin and nucleosome-free DNA. We show that although nucleosome-free DNA can recruit nuclear-envelope membranes, nucleosomes are required for spindle assembly and for formation of the lamina and of nuclear pore complexes (NPCs). We show that, in addition to the Ran G-nucleotide exchange factor RCC1, ELYS, the initiator of NPC formation, fails to associate with naked DNA but directly binds histone H2A-H2B dimers and nucleosomes. Tethering ELYS and RCC1 to DNA bypasses 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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Species referenced: Xenopus laevis
Genes referenced: ahctf1 h2ac21 h2bc21 ran rcc1
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