DNA damage-induced cell cycle checkpoint control requires CtIP, a phosphorylation-dependent binding partner of BRCA1 C-terminal domains |
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| Authors: | Yu Xiaochun Chen Junjie |
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| Affiliation: | Department of Oncology, Mayo Clinic and Foundation, Rochester, MN 55905, USA. |
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| Abstract: | The BRCA1 C-terminal (BRCT) domain has recently been implicated as a phospho-protein binding domain. We demonstrate here that a CTBP-interacting protein CtIP interacts with BRCA1 BRCT domains in a phosphorylation-dependent manner. The CtIP/BRCA1 complex only exists in G(2) phase and is required for DNA damage-induced Chk1 phosphorylation and the G(2)/M transition checkpoint. However, the CtIP/BRCA1 complex is not required for the damage-induced G(2) accumulation checkpoint, which is controlled by a separate BRCA1/BACH1 complex. Taken together, these data not only implicate CtIP as a critical player in cell cycle checkpoint control but also provide molecular mechanisms by which BRCA1 controls multiple cell cycle transitions after DNA damage. |
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