Summary

Name NBN
Full Name Nibrin
Synonyms Cell cycle regulatory protein p95, Nijmegen breakage syndrome protein 1 | NBS, NBS1, P95
Primary ID O60934
Links - -
Type protein
Relations 14
Function Component of the MRE11-RAD50-NBN (MRN complex) which plays a critical role in the cellular response to DNA damage and the maintenance of chromosome integrity. The complex is involved in double-strand break (DSB) repair, DNA recombination, maintenance of telomere integrity, cell cycle checkpoint control and meiosis. The complex possesses single-strand endonuclease activity and double-strand-specific 3'-5' exonuclease activity, which are provided by MRE11. RAD50 may be required to bind DNA ends and hold them in close proximity. NBN modulate the DNA damage signal sensing by recruiting PI3/PI4-kinase family members ATM, ATR, and probably DNA-PKcs to the DNA damage sites and activating their functions. It can also recruit MRE11 and RAD50 to the proximity of DSBs by an interaction with the histone H2AX. NBN also functions in telomere length maintenance by generating the 3' overhang which serves as a primer for telomerase dependent telomere elongation. NBN is a major player in the control of intra-S-phase checkpoint and there is some evidence that NBN is involved in G1 and G2 checkpoints. The roles of NBS1/MRN encompass DNA damage sensor, signal transducer, and effector, which enable cells to maintain DNA integrity and genomic stability. Forms a complex with RBBP8 to link DNA double-strand break sensing to resection. Enhances AKT1 phosphorylation possibly by association with the mTORC2 complex.

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▶Modifications Tables

Relations

Regulator Mechanism target score ℹ
+ ATMup-regulates img/direct-activation.png phosphorylation NBN 0.852
Publications: 5 Organism: Homo Sapiens
+ ATRup-regulates img/direct-activation.png phosphorylation NBN 0.777
Publications: 1 Organism: Homo Sapiens
+ MDC1up-regulates img/direct-activation.png binding NBN 0.829
Publications: 1 Organism: Homo Sapiens
+ RPA2up-regulates img/direct-activation.png binding NBN 0.53
Publications: 1 Organism: Homo Sapiens
+ NBNup-regulates img/direct-activation.png binding ATM 0.852
Publications: 2 Organism: Homo Sapiens
+ NBNform complex img/form-complex.png binding MRE11/RAD50/NBS1 0.911
Publications: 1
+ TCOF1up-regulates activity img/direct-activation.png relocalization NBN 0.324
Publications: 1 Organism: Homo Sapiens
+ MRE11up-regulates img/direct-activation.png binding NBN 0.2
Publications: 1 Organism: Homo Sapiens
+ H2AXup-regulates img/direct-activation.png binding NBN 0.2
Publications: 1 Organism: Homo Sapiens