+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-18191 | ||||||||||||||||||
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Title | X. laevis CMG dimer bound to dimeric DONSON - without ATPase | ||||||||||||||||||
Map data | |||||||||||||||||||
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 / mitotic DNA replication checkpoint signaling / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / replisome / regulation of DNA-templated DNA replication initiation ...GINS complex / premeiotic DNA replication / CMG complex / MCM complex / mitotic DNA replication checkpoint signaling / double-strand break repair via break-induced replication / mitotic DNA replication initiation / single-stranded DNA helicase activity / replisome / regulation of DNA-templated DNA replication initiation / DNA strand elongation involved in DNA replication / DNA unwinding involved in DNA replication / replication fork processing / mitotic G2 DNA damage checkpoint signaling / DNA replication origin binding / DNA replication initiation / DNA helicase activity / DNA damage checkpoint signaling / regulation of DNA-templated transcription elongation / replication fork / helicase activity / DNA-templated DNA replication / single-stranded DNA binding / DNA helicase / DNA replication / cell division / 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: 3.14 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_18191.map.gz | 567.2 MB | EMDB map data format | |
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Header (meta data) | emd-18191-v30.xml emd-18191.xml | 31 KB 31 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_18191_fsc.xml | 17.8 KB | Display | FSC data file |
Images | emd_18191.png | 93.5 KB | ||
Filedesc metadata | emd-18191.cif.gz | 10.1 KB | ||
Others | emd_18191_half_map_1.map.gz emd_18191_half_map_2.map.gz | 557.3 MB 557.3 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-18191 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-18191 | HTTPS FTP |
-Validation report
Summary document | emd_18191_validation.pdf.gz | 1 MB | Display | EMDB validaton report |
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Full document | emd_18191_full_validation.pdf.gz | 1 MB | Display | |
Data in XML | emd_18191_validation.xml.gz | 27.2 KB | Display | |
Data in CIF | emd_18191_validation.cif.gz | 35.6 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-18191 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-18191 | HTTPS FTP |
-Related structure data
Related structure data | 8q6oMC 8q6pC M: atomic model generated by this map 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_18191.map.gz / Format: CCP4 / Size: 600.7 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: #2
File | emd_18191_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_18191_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Sample components
+Entire : X. laevis CMG dimer bound to dimeric DONSON
+Supramolecule #1: X. laevis CMG dimer bound to dimeric DONSON
+Macromolecule #1: DNA replication licensing factor mcm2
+Macromolecule #2: Maternal DNA replication licensing factor mcm3
+Macromolecule #3: DNA replication licensing factor mcm4-B
+Macromolecule #4: DNA replication licensing factor mcm5-A
+Macromolecule #5: Maternal DNA replication licensing factor mcm6
+Macromolecule #6: DNA replication licensing factor mcm7-B
+Macromolecule #7: DNA replication complex GINS protein PSF1
+Macromolecule #8: DNA replication complex GINS protein PSF2
+Macromolecule #9: DNA replication complex GINS protein PSF3
+Macromolecule #10: Cell division control protein 45 homolog
+Macromolecule #11: DNA replication complex GINS protein SLD5
+Macromolecule #12: Protein downstream neighbor of son homolog
+Macromolecule #13: ZINC 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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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 |