Large-scale ATP-independent nucleosome unfolding by a histone chaperone.

Large-scale ATP-independent nucleosome unfolding by a histone chaperone.
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由组蛋白伴侣展开的大规模 ATP 独立核小体。

DOI:
10.1038/nsmb.3321
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发表时间:
2016-12
影响因子:
16.8
通讯作者:
Feofanov AV
Feofanov AV
中科院分区:
生物学1区
文献类型:
--
作者:
Valieva ME;Armeev GA;Kudryashova KS;Gerasimova NS;Shaytan AK;Kulaeva OI;McCullough LL;Formosa T;Georgiev PG;Kirpichnikov MP;Studitsky VM;Feofanov AV

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DNA对调节蛋白的可及性受到核小体结构和动力学的显着影响。FACT(促进染色质转录)增加核小体DNA的可及性,但这种核小体重组的机制和程度尚不清楚。我们在这里报告的影响,FACT对单个核小体spFRET显微镜显示。FACT结合导致显著的、ATP非依赖性的和可逆的DNA解螺旋,其影响核小体中至少70%的DNA。FACT的突变形式在这种解螺旋中是有缺陷的,并且在体内抑制由这种FACT突变引起的表型的组蛋白突变在体外恢复解螺旋活性。因此,FACT依赖的核小体去折叠调节核小体DNA的可及性,这是FACT在体内的重要功能。
DNA accessibility to regulatory proteins is significantly affected by nucleosome structure and dynamics. FACT (facilitates chromatin transcription) increases the accessibility of nucleosomal DNA but the mechanism and extent of this nucleosome reorganization are unknown. We report here the effects of FACT on single nucleosomes revealed with spFRET microscopy. FACT binding results in a dramatic, ATP-independent, and reversible uncoiling of DNA that affects at least 70% of the DNA in a nucleosome. A mutated version of FACT is defective in this uncoiling, and a histone mutation that suppresses phenotypes caused by this FACT mutation in vivo restores the uncoiling activity in vitro. Thus FACT-dependent nucleosome unfolding modulates the accessibility of nucleosomal DNA, and this is an important function of FACT in vivo.
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