Nucleosomes can invade DNA territories occupied by their neighbors.

Nucleosomes can invade DNA territories occupied by their neighbors.
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DOI:
10.1038/nsmb.1551
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发表时间:
2009-02
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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核小体是真核生物染色质的基本亚单位。它们不是静态的实体,而是可以经历许多动态的转变,包括沿着DNA的自发重新定位。由于核小体在基因组中间隔很近,因此它们可能偶尔会彼此接近和/或碰撞。在这里,我们已经使用了一个双核体模型系统,以显示两个核小体的147 bp的DNA领土可以广泛重叠。在重叠44 bp或54 bp的情况下,一个组蛋白二聚体丢失,并且所得复合物可以凝聚形成致密的单个颗粒。我们提出了一种途径,其中相邻的核小体促进DNA解开,因为它们彼此接近,这使得它们的147 bp的领土重叠。这些可能代表了通过碰撞去除核小体的途径中的早期步骤。
Nucleosomes are the fundamental subunits of eukaryotic chromatin. They are not static entities, but can undergo a number of dynamic transitions including spontaneous repositioning along DNA. Since nucleosomes are spaced close together within genomes it is likely that on occasion they approach each other and or collide. Here we have used a dinucleosomal model system to show that the 147bp DNA territories of two nucleosomes can overlap extensively. In the situation of an overlap by 44 bp or 54 bp one histone dimer is lost and the resulting complex can condense to form a compact single particle. We propose a pathway in which adjacent nucleosomes promote DNA unraveling as they approach each other and that this permits their 147bp territories to overlap. These may represent early steps in a pathway for nucleosome removal via collision.
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发表时间: 1998-02-13
影响因子: 5.6
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