Ubiquitin ligase UBR3 regulates cellular levels of the essential DNA repair protein APE1 and is required for genome stability.

Ubiquitin ligase UBR3 regulates cellular levels of the essential DNA repair protein APE1 and is required for genome stability.
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DOI:
10.1093/nar/gkr744
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发表时间:
2012-01
影响因子:
14.9
通讯作者:
Dianov GL
Dianov GL
中科院分区:
生物学2区
文献类型:
--
作者:
Meisenberg C;Tait PS;Dianova II;Wright K;Edelmann MJ;Ternette N;Tasaki T;Kessler BM;Parsons JL;Kwon YT;Dianov GL

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APE 1(Ref-1)是一种参与DNA损伤修复和转录调控的人类必需蛋白质。虽然APE 1的细胞功能和生化特性已被很好地表征,但对这种重要的DNA修复/转录调节酶的细胞水平调节所涉及的机制仍然知之甚少。使用体外泛素化测定,我们现在已经纯化了人E3泛素连接酶UBR 3作为一个主要的活动,聚泛素化APE 1在多个赖氨酸残基上的N-末端尾巴上聚集。我们进一步表明,敲除小鼠胚胎成纤维细胞中的Ubr 3基因导致APE 1蛋白的细胞水平上调和随后的基因组不稳定性。这些数据表明UBR 3在控制APE 1的稳态水平和因此的无错误DNA修复中起重要作用。
APE1 (Ref-1) is an essential human protein involved in DNA damage repair and regulation of transcription. Although the cellular functions and biochemical properties of APE1 are well characterized, the mechanism involved in regulation of the cellular levels of this important DNA repair/transcriptional regulation enzyme, remains poorly understood. Using an in vitro ubiquitylation assay, we have now purified the human E3 ubiquitin ligase UBR3 as a major activity that polyubiquitylates APE1 at multiple lysine residues clustered on the N-terminal tail. We further show that a knockout of the Ubr3 gene in mouse embryonic fibroblasts leads to an up-regulation of the cellular levels of APE1 protein and subsequent genomic instability. These data propose an important role for UBR3 in the control of the steady state levels of APE1 and consequently error free DNA repair.
DOI: 10.1038/ncb2058
发表时间: 2010-06-01
影响因子: 21.3
作者:
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