Initiating base excision repair in chromatin.

Initiating base excision repair in chromatin.
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DOI:
10.1016/j.dnarep.2018.08.011
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发表时间:
2018-11
期刊:
影响因子:
3.8
通讯作者:
Delaney S
Delaney S
中科院分区:
医学3区
文献类型:
--
作者:
Kennedy EE;Caffrey PJ;Delaney S

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碱基切除修复(BER)途径去除可能对生物体有害的修饰核碱基。 BER 由糖基化酶启动,糖基化酶发现并去除这些修饰的核碱基。大多数糖基化酶活性的表征都是在 DNA 寡聚物底物的背景下进行的。然而,真核生物体内的DNA存在于一个包装环境中,其基本组织单位是核小体核心颗粒(NCP)。 NCP 是一种复杂的修复底物,其中多种因素可以影响糖基化酶活性。在这篇综述中,我们重点关注 NCP 中修饰核碱基的几何定位以及对糖基酶活性和起始 BER 的影响。
The base excision repair (BER) pathway removes modified nucleobases that can be deleterious to an organism. BER is initiated by a glycosylase, which finds and removes these modified nucleobases. Most of the characterization of glycosylase activity has been conducted in the context of DNA oligomer substrates. However, DNA within eukaryotic organisms exists in a packaged environment with the basic unit of organization being the nucleosome core particle (NCP). The NCP is a complex substrate for repair in which a variety of factors can influence glycosylase activity. In this Review, we focus on the geometric positioning of modified nucleobases in an NCP and the consequences on glycosylase activity and initiating BER.
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