FAAP20: a novel ubiquitin-binding FA nuclear core-complex protein required for functional integrity of the FA-BRCA DNA repair pathway

FAAP20: a novel ubiquitin-binding FA nuclear core-complex protein required for functional integrity of the FA-BRCA DNA repair pathway
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DOI:
10.1182/blood-2011-10-385963
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发表时间:
2012-04-05
期刊:
影响因子:
20.3
通讯作者:
Meetei, Amom Ruhikanta
Meetei, Amom Ruhikanta
中科院分区:
医学1区
文献类型:
--
作者:
Ali, Abdullah Mahmood;Pradhan, Arun;Meetei, Amom Ruhikanta

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范可尼贫血 (FA) 核核心复合物是一种多蛋白复合物,是调节 DNA 修复的 FA-BRCA 途径功能完整性所必需的。该通路在 FA 中失活,FA 是一种破坏性遗传疾病,会导致患者出现血液缺陷和癌症。在这里,我们报告了一种新型 20-kDa FANCA 相关蛋白 (FAAP20) 的分离和表征。我们证明 FAAP20 是 FA 核核心复合体的一个组成部分。我们确定了 FANCA 上与 FAAP20 物理相互作用的区域,并表明 FANCA 调节该蛋白质的稳定性。 FAAP20 包含保守的泛素结合锌指结构域 (UBZ),并在体外结合 K-63 连接的泛素链。 FAAP20-UBZ 结构域不是与 FANCA 相互作用所必需的,但对于 DNA 损伤诱导的 FANCA 染色质负载和 FA 途径的功能完整性是必需的。这些发现揭示了 FAAP20 在 DNA 损伤修复和基因组维护的 FA-BRCA 途径中的关键作用。 (血。2012;119(14):3285-3294)
Fanconi anemia (FA) nuclear core complex is a multiprotein complex required for the functional integrity of the FA-BRCA pathway regulating DNA repair. This pathway is inactivated in FA, a devastating genetic disease, which leads to hematologic defects and cancer in patients. Here we report the isolation and characterization of a novel 20-kDa FANCA-associated protein (FAAP20). We show that FAAP20 is an integral component of the FA nuclear core complex. We identify a region on FANCA that physically interacts with FAAP20, and show that FANCA regulates stability of this protein. FAAP20 contains a conserved ubiquitin-binding zinc-finger domain (UBZ), and binds K-63-linked ubiquitin chains in vitro. The FAAP20-UBZ domain is not required for interaction with FANCA, but is required for DNA-damage-induced chromatin loading of FANCA and the functional integrity of the FA pathway. These findings reveal critical roles for FAAP20 in the FA-BRCA pathway of DNA damage repair and genome maintenance. (Blood. 2012; 119(14): 3285-3294)