Component of the MRN complex, which plays a central role in double-strand break repair, DNA recombination, maintenance of telomere integrity and meiosis . The MRN complex is involved in the repair of DNA double-strand breaks via homologous recombination , an error-free mechanism which primarily occurs during S and G2 phases . The complex mediates the end resection of damaged DNA, which generates proper single-stranded DNA, a key initial steps in HR, and is required for the recruitment of other repair factors and efficient activation of ATM and ATR upon DNA damage . 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 . Within the MRN complex, NBN acts as a protein-protein adapter, which specifically recognizes and binds phosphorylated proteins, promoting their recruitment to DNA damage sites . Recruits MRE11 and RAD50 components of the MRN complex to DSBs in response to DNA damage . Promotes the recruitment of PI3/PI4-kinase family members ATM, ATR, and probably DNA-PKcs to the DNA damage sites, activating their functions . Mediates the recruitment of phosphorylated RBBP8/CtIP to DSBs, leading to cooperation between the MRN complex and RBBP8/CtIP to initiate end resection . RBBP8/CtIP specifically promotes the endonuclease activity of the MRN complex to clear DNA ends containing protein adducts . The MRN complex is also required for the processing of R-loops . NBN also functions in telomere length maintenance via its interaction with TERF2: interaction with TERF2 during G1 phase preventing recruitment of DCLRE1B/Apollo to telomeres . NBN also promotes DNA repair choice at dysfunctional telomeres: NBN phosphorylation by CK2 promotes non-homologous end joining repair at telomeres, while unphosphorylated NBN promotes microhomology-mediated end-joining repair . Enhances AKT1 phosphorylation possibly by association with the mTORC2 complex .

Nibrin (Cell cycle regulatory protein p95) (Nijmegen breakage syndrome protein 1) (hNbs1)

o60934

Human,Mouse,Rat

WB,IHC

WB 1:1000-1:5000
IHC 1:100-1:200

~85 kD

Rabbit

50mM Tris-Glycine(pH 7.4), 0.15M NaCl, 40% Glycerol, 0.01% sodium azide and 0.05% BSA.

Store at -20°C. Stable for 12 months from date of receipt.