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- EMDB-52960: Cryo-EM structure of human Mre11-Rad50-Nbs1 complex bound to DNA -
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Open data
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Basic information
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Title | Cryo-EM structure of human Mre11-Rad50-Nbs1 complex bound to DNA | |||||||||
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![]() | Mre11-Rad50-Nbs1 complex / double-strand DNA break repair protein / nuclease / HYDROLASE | |||||||||
Function / homology | ![]() telomere maintenance via telomere trimming / 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 / blastocyst growth / negative regulation of telomere capping / BRCA1-C complex / Sensing of DNA Double Strand Breaks ...telomere maintenance via telomere trimming / 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 / blastocyst growth / negative regulation of telomere capping / BRCA1-C complex / Sensing of DNA Double Strand Breaks / meiotic DNA double-strand break formation / protection from non-homologous end joining at telomere / regulation of mitotic recombination / R-loop processing / Hydrolases; Acting on acid anhydrides / t-circle formation / single-stranded DNA endodeoxyribonuclease activity / chromosome organization involved in meiotic cell cycle / phosphorylation-dependent protein binding / 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 / nuclear inclusion body / 3'-5'-DNA exonuclease activity / DNA double-strand break processing / single-stranded telomeric DNA binding / Impaired BRCA2 binding to PALB2 / double-strand break repair via alternative nonhomologous end joining / chromatin-protein adaptor activity / protein localization to site of double-strand break / telomere maintenance via recombination / isotype switching / 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 / regulation of DNA-templated DNA replication initiation / 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) / neuromuscular process controlling balance / positive regulation of double-strand break repair / Impaired BRCA2 binding to RAD51 / mitotic G2 DNA damage checkpoint signaling / positive regulation of telomere maintenance / telomere maintenance in response to DNA damage / Presynaptic phase of homologous DNA pairing and strand exchange / protein K63-linked ubiquitination / neuroblast proliferation / telomere maintenance via telomerase / positive regulation of double-strand break repair via homologous recombination / 3'-5' exonuclease activity / telomere maintenance / intrinsic apoptotic signaling pathway / DNA damage checkpoint signaling / replication fork / protein serine/threonine kinase activator activity / condensed nuclear chromosome / DNA endonuclease activity / meiotic cell cycle / double-strand break repair via homologous recombination / DNA damage response, signal transduction by p53 class mediator / Nonhomologous End-Joining (NHEJ) / HDR through Homologous Recombination (HRR) / G2/M DNA damage checkpoint / PML body / DNA Damage/Telomere Stress Induced Senescence / double-strand break repair via nonhomologous end joining / Meiotic recombination / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / site of double-strand break / double-strand break repair / manganese ion binding / Processing of DNA double-strand break ends / double-stranded DNA binding / Regulation of TP53 Activity through Phosphorylation / histone binding / protein-macromolecule adaptor activity / DNA recombination / damaged DNA binding / DNA-binding transcription factor binding / Hydrolases; Acting on ester bonds / chromosome, telomeric region / cell population proliferation / regulation of cell cycle / cadherin binding / DNA repair / DNA damage response / negative regulation of apoptotic process / nucleolus Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.79 Å | |||||||||
![]() | Cui HJ / Lammens K / Hopfner KP / Fan YL / Kuybu F | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for DNA break sensing by human MRE11-RAD50-NBS1 and its regulation by telomeric factor TRF2. Authors: Yilan Fan / Filiz Kuybu / Hengjun Cui / Katja Lammens / Jia-Xuan Chen / Michael Kugler / Christophe Jung / Karl-Peter Hopfner / ![]() Abstract: 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. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 91.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 26 KB 26 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.9 KB | Display | ![]() |
Images | ![]() | 124.5 KB | ||
Masks | ![]() | 178 MB | ![]() | |
Filedesc metadata | ![]() | 8.7 KB | ||
Others | ![]() ![]() | 165.4 MB 165.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 21 KB | Display | |
Data in CIF | ![]() | 27.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 9q9iMC ![]() 9q9hC ![]() 9q9jC ![]() 9q9kC ![]() 9q9mC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.727 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Density Histograms |
-Half map: #2
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Density Histograms |
-Half map: #1
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : Mre11-Rad50-Nbs1-DNA complex
+Supramolecule #1: Mre11-Rad50-Nbs1-DNA complex
+Macromolecule #1: DNA (50-MER)
+Macromolecule #2: DNA (50-MER)
+Macromolecule #3: Nibrin
+Macromolecule #4: DNA repair protein RAD50
+Macromolecule #5: Double-strand break repair protein MRE11
+Macromolecule #6: MAGNESIUM ION
+Macromolecule #7: ADENOSINE-5'-DIPHOSPHATE
+Macromolecule #8: BERYLLIUM TRIFLUORIDE ION
+Macromolecule #9: MANGANESE (II) ION
+Macromolecule #10: water
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 Details: 25mM Hepes-NaOH, pH 7.5, 150 mM NaCl, 1 mM DTT, 1 mM ATP, 1mM BeF3, 5 mM MgCl2, 1 mM MnCl2 |
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 12 sec. / Details: 20 mA, 12 s |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 283 K / Instrument: LEICA PLUNGER |
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Electron microscopy
Microscope | TFS KRIOS |
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Specialist optics | Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV |
Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Detector mode: COUNTING / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.6 µm / Nominal defocus min: 0.5 µm |
Sample stage | Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model | Chain - Source name: AlphaFold / Chain - Initial model type: in silico model |
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Refinement | Space: REAL / Protocol: RIGID BODY FIT |
Output model | ![]() PDB-9q9i: |