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寡核小体的 RSC 重塑:原子力显微镜研究。

RSC remodeling of oligo-nucleosomes: an atomic force microscopy study.

机构信息

Université de Lyon, Laboratoire de Physique, CNRS UMR 5672, Lyon Cedex 07, France.

出版信息

Nucleic Acids Res. 2011 Apr;39(7):2571-9. doi: 10.1093/nar/gkq1254. Epub 2010 Dec 7.

Abstract

The 'remodels structure of chromatin' (RSC) complex is an essential chromatin remodeling factor that is required for the control of several processes including transcription, repair and replication. The ability of RSC to relocate centrally positioned mononucleosomes at the end of nucleosomal DNA is firmly established, but the data on RSC action on oligo-nucleosomal templates remains still scarce. By using atomic force microscopy (AFM) imaging, we have quantitatively studied the RSC-induced mobilization of positioned di- and trinucleosomes as well as the directionality of mobilization on mononucleosomal template labeled at one end with streptavidin. AFM imaging showed only a limited set of distinct configurational states for the remodeling products. No stepwise or preferred directionality of the nucleosome motion was observed. Analysis of the corresponding reaction pathways allows deciphering the mechanistic features of RSC-induced nucleosome relocation. The final outcome of RSC remodeling of oligosome templates is the packing of the nucleosomes at the edge of the template, providing large stretches of DNA depleted of nucleosomes. This feature of RSC may be used by the cell to overcome the barrier imposed by the presence of nucleosomes.

摘要

“重塑染色质结构”(RSC)复合物是一种必需的染色质重塑因子,对于包括转录、修复和复制在内的多个过程的控制至关重要。RSC 能够将中央定位的单核小体重新定位到核小体 DNA 的末端,这一点已得到充分证实,但关于 RSC 在寡核小体模板上的作用的数据仍然很少。通过原子力显微镜(AFM)成像,我们定量研究了 RSC 诱导的定位二聚体和三聚体的迁移以及在一端用链霉亲和素标记的单核小体模板上迁移的方向性。AFM 成像仅显示了一组有限的重塑产物的独特构象状态。没有观察到核小体运动的逐步或优先方向性。对相应反应途径的分析可以揭示 RSC 诱导核小体重定位的机制特征。寡核小体模板的 RSC 重塑的最终结果是将核小体包装在模板的边缘,提供了大量缺乏核小体的 DNA 区域。RSC 的这一特性可能被细胞用来克服核小体存在带来的障碍。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7537/3074153/c416c433ffdc/gkq1254f1.jpg

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