Telomere-associated protein RIF1 (Rif1)

Key regulator of TP53BP1 that plays a key role in the repair of double-strand DNA breaks (DSBs) in response to DNA damage: functions by promoting non-homologous end joining (NHEJ)- mediated repair of DSBs (PubMed:23333305, PubMed:23306437, PubMed:23306439). In response to DNA damage, interacts with ATM- phosphorylated TP53BP1 (PubMed:23333305, PubMed:23306437, PubMed:23306439).

Interaction with TP53BP1 contributes to dissociate the interaction between NUDT16L1/TIRR and TP53BP1, thereby unmasking the tandem Tudor-like domain of TP53BP1 and allowing recruitment to DNA DSBs (By similarity). Once recruited to DSBs, RIF1 and TP53BP1 act by boosting NHEJ-mediated repair of DSBs (PubMed:23333305, PubMed:23306437).