RAD52 Adjusts Repair of Single-Strand Breaks via Reducing DNA-Damage-Promoted XRCC1/LIG3α Co-localization.

RAD52 Adjusts Repair of Single-Strand Breaks via Reducing DNA-Damage-Promoted XRCC1/LIG3α Co-localization.
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DOI:
10.1016/j.celrep.2020.108625
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发表时间:
2021-01-12
期刊:
影响因子:
8.8
通讯作者:
Wang Y
Wang Y
中科院分区:
生物学1区
文献类型:
--
作者:
Wang J;Oh YT;Li Z;Dou J;Tang S;Wang X;Wang H;Takeda S;Wang Y

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辐射敏感 52 (RAD52) 是双链断裂修复 (DSBR) 的重要因素。然而,脊椎动物/哺乳动物 Rad52 的缺陷没有明显的表型。根本机制仍然难以捉摸。在这里,我们报告 RAD52 缺陷在喜树碱 (CPT) 治疗后增加了细胞存活率。 CPT 会产生单链断裂 (SSB),如果不修复,会进一步转化为双链断裂 (DSB)。 RAD52 通过强单链 DNA (ssDNA) 和/或多聚 (ADP-核糖) (PAR) 结合亲和力抑制 SSB 修复 (SSBR),从而减少 DNA 损伤促进的 X 射线修复交叉互补 1 (XRCC1)/连接酶 IIIα (LIG3α) 共定位。 RAD52 对 SSBR 的抑制作用中和了 RAD52 在 DSBR 中的作用,表明 RAD52 可能维持细胞存活和基因组完整性之间的平衡。此外,我们证明,阻断 RAD52 寡聚化会破坏 RAD52 的 DSBR,同时保留 RAD52 对 SSBR 抑制作用所需的 ssDNA 结合能力,使细胞对不同的 DNA 损伤剂敏感。这一发现为在癌症治疗中开发有效的 RAD52 抑制剂提供了指导。王等人。显示脊椎动物/哺乳动物 RAD52 通过抑制 PARP 介导的 SSBR 促进 CPT 诱导的细胞死亡,这涉及 RAD52 强大的 ssDNA/PAR 结合亲和力,减少 DNA 损伤促进的 XRCC1-LIG3a 相互作用。阻断 RAD52 寡聚化,同时保留 RAD52 的 ssDNA 结合能力,有效地使细胞对不同的 DNA 损伤剂敏感。
Radiation sensitive 52 (RAD52) is an important factor for double-strand break repair (DSBR). However, deficiency in vertebrate/mammalian Rad52 has no apparent phenotype. The underlying mechanism remains elusive. Here, we report that RAD52 deficiency increased cell survival after camptothecin (CPT) treatment. CPT generates single-strand breaks (SSBs) that further convert to double-strand breaks (DSBs) if they are not repaired. RAD52 inhibits SSB repair (SSBR) through strong single-strand DNA (ssDNA) and/or poly(ADP-ribose) (PAR) binding affinity to reduce DNA-damage-promoted X-Ray Repair Cross Complementing 1 (XRCC1)/ligase IIIα (LIG3α) co-localization. The inhibitory effects of RAD52 on SSBR neutralize the role of RAD52 in DSBR, suggesting that RAD52 may maintain a balance between cell survival and genomic integrity. Furthermore, we demonstrate that blocking RAD52 oligomerization that disrupts RAD52’s DSBR, while retaining its ssDNA binding capacity that is required for RAD52’s inhibitory effects on SSBR, sensitizes cells to different DNA-damaging agents. This discovery provides guidance for developing efficient RAD52 inhibitors in cancer therapy. Wang et al. show that vertebrate/mammalian RAD52 promotes CPT-induced cell death via inhibition of PARP-mediated SSBR, which involves RAD52’s strong ssDNA/PAR binding affinity that reduces DNA-damage-promoted XRCC1-LIG3a interaction. Blocking of RAD52 oligomerization, while retaining the ssDNA binding capacity of RAD52, efficiently sensitizes cells to different DNA-damaging agents.
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发表时间: 2017-04
期刊: DNA repair
影响因子: 3.8
作者:
Gravells P;Grant E;Smith KM;James DI;Bryant HE
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发表时间: 2010-07-28
影响因子: 7.8
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发表时间: 2015-11-19
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发表时间: 2017-10
期刊: Nature reviews. Molecular cell biology
影响因子: --
作者:
Ray Chaudhuri A;Nussenzweig A
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酪氨酸磷酸化通过调节其DNA结合来增强RAD52介导的退火。
DOI: 10.1038/emboj.2011.238
发表时间: 2011-07-29
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
Honda, Masayoshi;Okuno, Yusuke;Yoo, Jungmin;Ha, Taekjip;Spies, Maria
通讯作者: Spies, Maria