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Yorodumi- EMDB-10116: Cutting state of the E. coli Mre11-Rad50 (SbcCD) head complex bou... -
+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-10116 | |||||||||
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Title | Cutting state of the E. coli Mre11-Rad50 (SbcCD) head complex bound to ADP and dsDNA. | |||||||||
Map data | ||||||||||
Sample |
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Keywords | Nuclease / DNA repair / ABC-type ATPase / DNA double-strand breaks / DNA BINDING PROTEIN | |||||||||
Function / homology | Function and homology information double-stranded DNA endonuclease activity / DNA exonuclease activity / DNA replication termination / single-stranded DNA endodeoxyribonuclease activity / 3'-5'-DNA exonuclease activity / DNA repair complex / exonuclease activity / 3'-5' exonuclease activity / double-strand break repair / endonuclease activity ...double-stranded DNA endonuclease activity / DNA exonuclease activity / DNA replication termination / single-stranded DNA endodeoxyribonuclease activity / 3'-5'-DNA exonuclease activity / DNA repair complex / exonuclease activity / 3'-5' exonuclease activity / double-strand break repair / endonuclease activity / DNA recombination / DNA replication / DNA repair / ATP hydrolysis activity / DNA binding / ATP binding Similarity search - Function | |||||||||
Biological species | Escherichia coli (E. coli) / synthetic construct (others) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.2 Å | |||||||||
Authors | Kaeshammer L / Saathoff JH | |||||||||
Funding support | Germany, 2 items
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Citation | Journal: Mol Cell / Year: 2019 Title: Mechanism of DNA End Sensing and Processing by the Mre11-Rad50 Complex. Authors: Lisa Käshammer / Jan-Hinnerk Saathoff / Katja Lammens / Fabian Gut / Joseph Bartho / Aaron Alt / Brigitte Kessler / Karl-Peter Hopfner / Abstract: DNA double-strand breaks (DSBs) threaten genome stability throughout life and are linked to tumorigenesis in humans. To initiate DSB repair by end joining or homologous recombination, the Mre11- ...DNA double-strand breaks (DSBs) threaten genome stability throughout life and are linked to tumorigenesis in humans. To initiate DSB repair by end joining or homologous recombination, the Mre11-nuclease Rad50-ATPase complex detects and processes diverse and obstructed DNA ends, but a structural mechanism is still lacking. Here we report cryo-EM structures of the E. coli Mre11-Rad50 homolog SbcCD in resting and DNA-bound cutting states. In the resting state, Mre11's nuclease is blocked by ATP-Rad50, and the Rad50 coiled coils appear flexible. Upon DNA binding, the two coiled coils zip up into a rod and, together with the Rad50 nucleotide-binding domains, form a clamp around dsDNA. Mre11 moves to the side of Rad50, binds the DNA end, and assembles a DNA cutting channel for the nuclease reactions. The structures reveal how Mre11-Rad50 can detect and process diverse DNA ends and uncover a clamping and gating function for the coiled coils. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_10116.map.gz | 95.2 MB | EMDB map data format | |
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Header (meta data) | emd-10116-v30.xml emd-10116.xml | 17.2 KB 17.2 KB | Display Display | EMDB header |
Images | emd_10116.png | 122.5 KB | ||
Filedesc metadata | emd-10116.cif.gz | 8.2 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-10116 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-10116 | HTTPS FTP |
-Validation report
Summary document | emd_10116_validation.pdf.gz | 533.8 KB | Display | EMDB validaton report |
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Full document | emd_10116_full_validation.pdf.gz | 533.4 KB | Display | |
Data in XML | emd_10116_validation.xml.gz | 6 KB | Display | |
Data in CIF | emd_10116_validation.cif.gz | 6.9 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-10116 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-10116 | HTTPS FTP |
-Related structure data
Related structure data | 6s85MC 6s6vC M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_10116.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.82 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
+Entire : Heterotetrameric complex of full-length Mre11-Rad50 (SbcCD) in co...
+Supramolecule #1: Heterotetrameric complex of full-length Mre11-Rad50 (SbcCD) in co...
+Supramolecule #2: Mre11-Rad50
+Supramolecule #3: dsDNA
+Macromolecule #1: Nuclease SbcCD subunit C
+Macromolecule #2: Nuclease SbcCD subunit D
+Macromolecule #3: DNA (31-MER)
+Macromolecule #4: DNA (32-MER)
+Macromolecule #5: ADENOSINE-5'-DIPHOSPHATE
+Macromolecule #6: MAGNESIUM ION
+Macromolecule #7: MANGANESE (II) ION
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.5 |
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Pretreatment - Type: GLOW DISCHARGE |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 2 / Number real images: 12811 / Average electron dose: 73.6 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Startup model | Type of model: NONE Details: The initial model was calculated de novo using cryoSPARC. |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 152271 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |