Mre11 regulates CtIP–dependent double strand break repair by interaction with CDK2

Homologous recombination (HR) facilitates accurate repair of DNA double strand breaks (DSBs) during S and G2 phases of the cell cycle by using intact sister chromatids as sequence templates. HR capacity is maximized in S and G2 by Cyclin–Dependent Kinase (CDK) phosphorylation of CtIP, which subsequently interacts with BRCA1 and the Mre11–Rad50–NBS1 (MRN) complex. Here we show that Mre11 controls these events through a direct interaction with CDK2 that is required for CtIP phosphorylation and BRCA1 interaction in normally dividing cells. CDK2 binds the C–terminus of Mre11, which is absent in an inherited allele causing Ataxia–Telangiectasia Like Disorder. This newly uncovered role for Mre11 does not require ATM activation or nuclease activities. Therefore, functions of MRN are not restricted to DNA damage responses, but include regulating HR capacity during the normal mammalian cell cycle.