+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-18195 | ||||||||||||||||||
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Title | Single CMG purified from replicating Xenopus egg extracts | ||||||||||||||||||
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Sample |
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Keywords | DNA replication initiation / Xenopus egg extract / primordial dwarfism / replicative helicase / genome stability / REPLICATION | ||||||||||||||||||
Function / homology | Function and homology information GINS complex / premeiotic DNA replication / CMG complex / MCM complex / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / regulation of DNA-templated DNA replication initiation / DNA strand elongation involved in DNA replication / DNA unwinding involved in DNA replication ...GINS complex / premeiotic DNA replication / CMG complex / MCM complex / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / regulation of DNA-templated DNA replication initiation / DNA strand elongation involved in DNA replication / DNA unwinding involved in DNA replication / DNA replication origin binding / DNA replication initiation / DNA helicase activity / helicase activity / DNA-templated DNA replication / single-stranded DNA binding / DNA helicase / DNA replication / chromatin binding / chromatin / ATP hydrolysis activity / DNA binding / nucleoplasm / ATP binding / nucleus / metal ion binding / cytoplasm Similarity search - Function | ||||||||||||||||||
Biological species | Xenopus laevis (African clawed frog) | ||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.03 Å | ||||||||||||||||||
Authors | Cvetkovic MA / Costa A | ||||||||||||||||||
Funding support | United Kingdom, European Union, 5 items
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Citation | Journal: Mol Cell / Year: 2023 Title: The structural mechanism of dimeric DONSON in replicative helicase activation. Authors: Milos A Cvetkovic / Paolo Passaretti / Agata Butryn / Alicja Reynolds-Winczura / Georgia Kingsley / Aggeliki Skagia / Cyntia Fernandez-Cuesta / Divyasree Poovathumkadavil / Roger George / ...Authors: Milos A Cvetkovic / Paolo Passaretti / Agata Butryn / Alicja Reynolds-Winczura / Georgia Kingsley / Aggeliki Skagia / Cyntia Fernandez-Cuesta / Divyasree Poovathumkadavil / Roger George / Anoop S Chauhan / Satpal S Jhujh / Grant S Stewart / Agnieszka Gambus / Alessandro Costa / Abstract: The MCM motor of the replicative helicase is loaded onto origin DNA as an inactive double hexamer before replication initiation. Recruitment of activators GINS and Cdc45 upon S-phase transition ...The MCM motor of the replicative helicase is loaded onto origin DNA as an inactive double hexamer before replication initiation. Recruitment of activators GINS and Cdc45 upon S-phase transition promotes the assembly of two active CMG helicases. Although work with yeast established the mechanism for origin activation, how CMG is formed in higher eukaryotes is poorly understood. Metazoan Downstream neighbor of Son (DONSON) has recently been shown to deliver GINS to MCM during CMG assembly. What impact this has on the MCM double hexamer is unknown. Here, we used cryoelectron microscopy (cryo-EM) on proteins isolated from replicating Xenopus egg extracts to identify a double CMG complex bridged by a DONSON dimer. We find that tethering elements mediating complex formation are essential for replication. DONSON reconfigures the MCM motors in the double CMG, and primordial dwarfism patients' mutations disrupting DONSON dimerization affect GINS and MCM engagement in human cells and DNA synthesis in Xenopus egg extracts. | ||||||||||||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_18195.map.gz | 398.4 MB | EMDB map data format | |
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Header (meta data) | emd-18195-v30.xml emd-18195.xml | 27.2 KB 27.2 KB | Display Display | EMDB header |
Images | emd_18195.png | 95.6 KB | ||
Filedesc metadata | emd-18195.cif.gz | 8.8 KB | ||
Others | emd_18195_half_map_1.map.gz emd_18195_half_map_2.map.gz | 391.9 MB 391.9 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-18195 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-18195 | HTTPS FTP |
-Validation report
Summary document | emd_18195_validation.pdf.gz | 1.1 MB | Display | EMDB validaton report |
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Full document | emd_18195_full_validation.pdf.gz | 1.1 MB | Display | |
Data in XML | emd_18195_validation.xml.gz | 17.9 KB | Display | |
Data in CIF | emd_18195_validation.cif.gz | 21.3 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-18195 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-18195 | HTTPS FTP |
-Related structure data
Related structure data | 8q6oC 8q6pC C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_18195.map.gz / Format: CCP4 / Size: 421.9 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: 0.95 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #1
File | emd_18195_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_18195_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Sample components
+Entire : Single CMG purified from replicating Xenopus egg extracts
+Supramolecule #1: Single CMG purified from replicating Xenopus egg extracts
+Macromolecule #1: DNA replication licensing factor Mcm2 - Xenopus laevis
+Macromolecule #2: DNA replication licensing factor Mcm3 - Xenopus laevis
+Macromolecule #3: DNA replication licensing factor Mcm4 - Xenopus laevis
+Macromolecule #4: DNA replication licensing factor Mcm5 - Xenopus laevis
+Macromolecule #5: DNA replication licensing factor Mcm6 - Xenopus laevis
+Macromolecule #6: DNA replication licensing factor Mcm7 - Xenopus laevis
+Macromolecule #7: DNA replication complex GINS protein Psf1 - Xenopus laevis
+Macromolecule #8: DNA replication complex GINS protein Psf2 - Xenopus laevis
+Macromolecule #9: DNA replication complex GINS protein Psf3 - Xenopus laevis
+Macromolecule #10: DNA replication complex GINS protein Sld5 - Xenopus laevis
+Macromolecule #11: Cell division control protein 45 - Xenopus laevis
-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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Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 33.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.4 µm / Nominal defocus min: 1.3 µm |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Startup model | Type of model: NONE |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.03 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 137591 |
Initial angle assignment | Type: PROJECTION MATCHING |
Final angle assignment | Type: PROJECTION MATCHING |