Abraxas and RAP80 Form a BRCA1 Protein Complex Required for the DNA Damage Response
2007; American Association for the Advancement of Science; Volume: 316; Issue: 5828 Linguagem: Inglês
10.1126/science.1139476
ISSN1095-9203
AutoresBin Wang, Shuhei Matsuoka, Bryan A. Ballif, Dong Zhang, Agata Smogorzewska, Steven P. Gygi, Stephen J. Elledge,
Tópico(s)BRCA gene mutations in cancer
ResumoThe BRCT repeats of the breast and ovarian cancer predisposition protein BRCA1 are essential for tumor suppression. Phosphopeptide affinity proteomic analysis identified a protein, Abraxas, that directly binds the BRCA1 BRCT repeats through a phospho-Ser-X-X-Phe motif. Abraxas binds BRCA1 to the mutual exclusion of BACH1 (BRCA1-associated C-terminal helicase) and CtIP (CtBP-interacting protein), forming a third type of BRCA1 complex. Abraxas recruits the ubiquitin-interacting motif (UIM)-containing protein RAP80 to BRCA1. Both Abraxas and RAP80 were required for DNA damage resistance, G(2)-M checkpoint control, and DNA repair. RAP80 was required for optimal accumulation of BRCA1 on damaged DNA (foci) in response to ionizing radiation, and the UIM domains alone were capable of foci formation. The RAP80-Abraxas complex may help recruit BRCA1 to DNA damage sites in part through recognition of ubiquitinated proteins.
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