DNA repair and telomere maintenance protein nbs1

UniProtKB accession:  O43070

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Component of the MRN complex, which plays a central role in double-strand break (DSB) repair, DNA recombination, maintenance of telomere integrity and meiosis (PubMed:12944481, PubMed:12944482, PubMed:15964794, PubMed:19804755, PubMed:22705791). The MRN complex is involved in the repair of DNA double-strand breaks (DSBs) via homologous recombination (HR), an error-free mechanism which primarily occurs during S and G2 phases (PubMed:12944481, PubMed:12944482, PubMed:15964794, PubMed:19804755, PubMed:22705791). The complex (1) mediates the end resection of damaged DNA, which generates proper single-stranded DNA, a key initial steps in HR, and is (2) required for the recruitment of other repair factors and efficient activation of tel1/atm upon DNA damage (PubMed:15964794, PubMed:19804755). The MRN complex possesses single-strand endonuclease activity and double-strand-specific 3'-5' exonuclease activity, which are provided by MRE11, to initiate end resection, which is required for single-strand invasion and recombination (By similarity). Within the MRN complex, nbs1 acts as a protein-protein adapter, which specifically recognizes and binds phosphorylated proteins, promoting their recruitment to DNA damage sites (PubMed:19804755, PubMed:22705791). Recruits rad32 and rad50 components of the MRN complex to DSBs in response to DNA damage (By similarity). Promotes the recruitment of tel1/atm to the DNA damage sites, activating tel1/atm function (PubMed:15964794). Mediates the recruitment of phosphorylated ctp1/CtIP to DSBs, leading to cooperation between the MRN complex and ctp1/CtIP to initiate end resection (PubMed:19804755).