Purified human BRCA2 stimulates RAD51-mediated recombination

Article

关键词: REPLICATION PROTEIN-A;    DNA STRAND EXCHANGE;    HUMAN RAD51 PROTEIN;    SUSCEPTIBILITY GENE BRCA2;    HOMOLOGY-DIRECTED REPAIR;    RADIATION HYPERSENSITIVITY;    NUCLEOPROTEIN FILAMENTS;    BINDING SELECTIVITY;    COMPLEX-FORMATION;    RECA PROTEIN;   

DOI  :  10.1038/nature09399

来源: SCIE

【 摘 要 】

Mutation of the breast cancer susceptibility gene, BRCA2, leads to breast and ovarian cancers. Mechanistic insight into the functions of human BRCA2 has been limited by the difficulty of isolating this large protein (3,418 amino acids). Here we report the purification of full-length BRCA2 and show that it both binds RAD51 and potentiates recombinational DNA repair by promoting assembly of RAD51 onto single-stranded DNA (ssDNA). BRCA2 acts by targeting RAD51 to ssDNA over double-stranded DNA, enabling RAD51 to displace replication protein-A (RPA) from ssDNA and stabilizing RAD51-ssDNA filaments by blocking ATP hydrolysis. BRCA2 does not anneal ssDNA complexed with RPA, implying it does not directly function in repair processes that involve ssDNA annealing. Our findings show that BRCA2 is a key mediator of homologous recombination, and they provide a molecular basis for understanding how this DNA repair process is disrupted by BRCA2 mutations, which lead to chromosomal instability and cancer.

【 授权许可】

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