chromosomal region / telomeric 3' overhang formation / mitochondrial double-strand break repair via homologous recombination / Mre11 complex / negative regulation of double-strand break repair via nonhomologous end joining / negative regulation of telomere capping / BRCA1-C complex / Sensing of DNA Double Strand Breaks / meiotic DNA double-strand break formation / regulation of mitotic recombination ...chromosomal region / telomeric 3' overhang formation / mitochondrial double-strand break repair via homologous recombination / Mre11 complex / negative regulation of double-strand break repair via nonhomologous end joining / negative regulation of telomere capping / BRCA1-C complex / Sensing of DNA Double Strand Breaks / meiotic DNA double-strand break formation / regulation of mitotic recombination / R-loop processing / 加水分解酵素; 酸無水物に作用 / single-stranded DNA endodeoxyribonuclease activity / chromosome organization involved in meiotic cell cycle / homologous chromosome pairing at meiosis / double-stranded telomeric DNA binding / DNA strand resection involved in replication fork processing / nuclease activity / homologous recombination / G-quadruplex DNA binding / 3'-5'-DNA exonuclease activity / DNA double-strand break processing / single-stranded telomeric DNA binding / Impaired BRCA2 binding to PALB2 / telomere maintenance via recombination / Cytosolic sensors of pathogen-associated DNA / mitotic G2/M transition checkpoint / HDR through MMEJ (alt-NHEJ) / IRF3-mediated induction of type I IFN / reciprocal meiotic recombination / mitotic intra-S DNA damage checkpoint signaling / sister chromatid cohesion / Homologous DNA Pairing and Strand Exchange / Defective homologous recombination repair (HRR) due to BRCA1 loss of function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA1 binding function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA2/RAD51/RAD51C binding function / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / Resolution of D-loop Structures through Holliday Junction Intermediates / HDR through Single Strand Annealing (SSA) / positive regulation of double-strand break repair / Impaired BRCA2 binding to RAD51 / mitotic G2 DNA damage checkpoint signaling / positive regulation of telomere maintenance / Presynaptic phase of homologous DNA pairing and strand exchange / telomere maintenance via telomerase / 3'-5' exonuclease activity / telomere maintenance / replication fork / protein serine/threonine kinase activator activity / condensed nuclear chromosome / DNA endonuclease activity / Nonhomologous End-Joining (NHEJ) / double-strand break repair via homologous recombination / G2/M DNA damage checkpoint / PML body / DNA Damage/Telomere Stress Induced Senescence / HDR through Homologous Recombination (HRR) / double-strand break repair via nonhomologous end joining / Meiotic recombination / double-strand break repair / manganese ion binding / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / site of double-strand break / Processing of DNA double-strand break ends / double-stranded DNA binding / protein-macromolecule adaptor activity / DNA recombination / Regulation of TP53 Activity through Phosphorylation / 加水分解酵素; エステル加水分解酵素 / chromosome, telomeric region / cell population proliferation / cadherin binding / DNA repair / DNA damage response / negative regulation of apoptotic process / ATP hydrolysis activity / DNA binding / nucleoplasm / ATP binding / metal ion binding / identical protein binding / nucleus / membrane / cytosol / cytoplasm 類似検索 - 分子機能
ジャーナル: Nat Commun / 年: 2025 タイトル: Structural basis for DNA break sensing by human MRE11-RAD50-NBS1 and its regulation by telomeric factor TRF2. 著者: Yilan Fan / Filiz Kuybu / Hengjun Cui / Katja Lammens / Jia-Xuan Chen / Michael Kugler / Christophe Jung / Karl-Peter Hopfner / 要旨: The MRE11-RAD50-NBS1 (MRN) complex is a central, multifunctional factor in the detection, signaling and nucleolytic processing of DNA double-strand breaks (DSBs). To clarify how human MRN binds ...The MRE11-RAD50-NBS1 (MRN) complex is a central, multifunctional factor in the detection, signaling and nucleolytic processing of DNA double-strand breaks (DSBs). To clarify how human MRN binds generic and telomeric DNA ends and can separate DNA end sensing from nuclease activities, we determined cryo-electron microscopy (cryo-EM) structures of human MRN bound to DNA and to DNA and the telomere protection factor TRF2. MRN senses DSBs through a tight clamp-like sensing state with closed coiled-coil domains, but auto-inhibited MRE11 nuclease. NBS1 wraps around the MRE11 dimer, with NBS1's ATM recruitment motif sequestered by binding to the regulatory RAD50 S site, necessitating a switch in the NBS1 C helix for ATM activation. At telomeric DNA, TRF2 blocks the second S site via the iDDR motif to prevent nuclease and ATM activation. Our results provide a structural framework for DNA sensing via a gating mechanism and separation of sensing, signaling and processing activities of mammalian MRN.
名称: Double-strand break repair protein MRE11 / タイプ: protein_or_peptide / ID: 2 詳細: Following residue R708 is a short GS linker, a PreScission cleavage site, and two FLAG tags. コピー数: 2 / 光学異性体: LEVO EC番号: 加水分解酵素; エステル加水分解酵素