Structure and mechanism of action of the BRCA2 breast cancer tumor suppressor.

Structure and mechanism of action of the BRCA2 breast cancer tumor suppressor.
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DOI:
10.1038/nsmb.2899
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发表时间:
2014-11
影响因子:
16.8
通讯作者:
Zhang X
Zhang X
中科院分区:
生物学1区
文献类型:
--
作者:
Shahid T;Soroka J;Kong E;Malivert L;McIlwraith MJ;Pape T;West SC;Zhang X

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BRCA2突变增加了患乳腺癌、卵巢癌和前列腺癌的易感性。人类BRCA2的产物BRCA2蛋白通过rad51介导的同源重组在DNA双链断裂和链间交联修复中起关键作用。在这里,我们提出了全长(3,418个氨基酸)BRCA2,单独和与RAD51复合物的生化和结构表征。我们发现BRCA2在单链DNA的多个位点促进RAD51细丝的成核。三维电子显微镜重建显示BRCA2以二聚体的形式存在,并且两组取向相反的RAD51分子与二聚体结合。单链DNA沿着BRCA2的长轴结合,因此只有一组RAD51单体可以与DNA形成生产复合体并建立丝的形成。我们的数据定义了这种肿瘤抑制因子促进rad51介导的同源重组修复的分子机制。
Mutations in BRCA2 increase susceptibility to breast, ovarian and prostate cancers. The product of human BRCA2, BRCA2 protein, plays a key role in the repair of DNA double strand breaks and interstrand crosslinks by RAD51-mediated homologous recombination. Here, we present a biochemical and structural characterization of full length (3,418 amino acid) BRCA2, alone and in complex with RAD51. We show that BRCA2 facilitates nucleation of RAD51 filaments at multiple sites on single-stranded DNA. Three-dimensional electron microscopy reconstructions revealed that BRCA2 exists as a dimer and that two oppositely-oriented sets of RAD51 molecules bind the dimer. Single stranded DNA binds along the long axis of BRCA2, such that only one set of RAD51 monomers can form a productive complex with DNA and establish filament formation. Our data define the molecular mechanism by which this tumor suppressor facilitates RAD51-mediated homologous recombinational repair.
DOI: 10.1093/emboj/16.17.5198
发表时间: 1997-09-01
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