Pasi Marco, Angelov Dimitar, Bednar Jan, Dimitrov Stefan, Lavery Richard
a Université de Lyon/CNRS UMR 5086, MMSB, Institut de Biologie et Chimie des Protéines , Lyon , France.
b Université de Lyon/CNRS/INRA UMR 5239, LBMC, Ecole Normale Supérieure de Lyon , Lyon , France.
Nucleus. 2016 Nov;7(6):554-559. doi: 10.1080/19491034.2016.1260800.
It has been shown experimentally that the action of the RSC chromatin remodeler leads to the formation of an irregular, partially remodeled nucleosome, termed a remosome. The remosome contains an extra 30-40 base pairs of DNA compared to a canonical nucleosome. Large-scale molecular simulations have provided information on the probable structure of remosomes and have explained why they remain stable in the absence of RSC. Here we explain how these simulations were carried out and what the resulting remosome models imply in terms of the mechanism of action of RSC. We notably show that local kinks within DNA are key in explaining how extra DNA can be in added to nucleosomes without unduly disturbing DNA-histone binding.
实验表明,RSC染色质重塑剂的作用会导致形成一种不规则的、部分重塑的核小体,称为remosome。与经典核小体相比,remosome含有额外的30 - 40个碱基对的DNA。大规模分子模拟提供了关于remosome可能结构的信息,并解释了它们在没有RSC的情况下如何保持稳定。在这里,我们解释了这些模拟是如何进行的,以及由此产生的remosome模型对RSC的作用机制意味着什么。我们特别表明,DNA内的局部扭结是解释如何在不过度干扰DNA - 组蛋白结合的情况下将额外的DNA添加到核小体中的关键。