+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-3642 | |||||||||
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Title | Full-length complex of CMG helicase with polymerase epsilon | |||||||||
Map data | ||||||||||
Sample |
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Biological species | Saccharomyces cerevisiae (brewer's yeast) | |||||||||
Method | single particle reconstruction / negative staining / Resolution: 24.4 Å | |||||||||
Authors | Zhou JC / Janska A / Goswami P / Renault L / Abid Ali F / Kotecha A / Diffley JFX / Costa A | |||||||||
Citation | Journal: Proc Natl Acad Sci U S A / Year: 2017 Title: CMG-Pol epsilon dynamics suggests a mechanism for the establishment of leading-strand synthesis in the eukaryotic replisome. Authors: Jin Chuan Zhou / Agnieszka Janska / Panchali Goswami / Ludovic Renault / Ferdos Abid Ali / Abhay Kotecha / John F X Diffley / Alessandro Costa / Abstract: The replisome unwinds and synthesizes DNA for genome duplication. In eukaryotes, the Cdc45-MCM-GINS (CMG) helicase and the leading-strand polymerase, Pol epsilon, form a stable assembly. The ...The replisome unwinds and synthesizes DNA for genome duplication. In eukaryotes, the Cdc45-MCM-GINS (CMG) helicase and the leading-strand polymerase, Pol epsilon, form a stable assembly. The mechanism for coupling DNA unwinding with synthesis is starting to be elucidated, however the architecture and dynamics of the replication fork remain only partially understood, preventing a molecular understanding of chromosome replication. To address this issue, we conducted a systematic single-particle EM study on multiple permutations of the reconstituted CMG-Pol epsilon assembly. Pol epsilon contains two flexibly tethered lobes. The noncatalytic lobe is anchored to the motor of the helicase, whereas the polymerization domain extends toward the side of the helicase. We observe two alternate configurations of the DNA synthesis domain in the CMG-bound Pol epsilon. We propose that this conformational switch might control DNA template engagement and release, modulating replisome progression. | |||||||||
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_3642.map.gz | 6 MB | EMDB map data format | |
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Header (meta data) | emd-3642-v30.xml emd-3642.xml | 7.8 KB 7.8 KB | Display Display | EMDB header |
Images | emd_3642.png | 160.9 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-3642 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-3642 | HTTPS FTP |
-Validation report
Summary document | emd_3642_validation.pdf.gz | 214.1 KB | Display | EMDB validaton report |
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Full document | emd_3642_full_validation.pdf.gz | 213.2 KB | Display | |
Data in XML | emd_3642_validation.xml.gz | 5.4 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-3642 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-3642 | HTTPS FTP |
-Related structure data
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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-Map
File | Download / File: emd_3642.map.gz / Format: CCP4 / Size: 8 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: 3.65 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 : Complex of CMG helicase with full length polymerase epsilon
Entire | Name: Complex of CMG helicase with full length polymerase epsilon |
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Components |
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-Supramolecule #1: Complex of CMG helicase with full length polymerase epsilon
Supramolecule | Name: Complex of CMG helicase with full length polymerase epsilon type: complex / ID: 1 / Parent: 0 |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) |
Recombinant expression | Organism: Saccharomyces cerevisiae (brewer's yeast) |
-Experimental details
-Structure determination
Method | negative staining |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.6 |
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Staining | Type: NEGATIVE / Material: uranyl formate |
-Electron microscopy
Microscope | JEOL 2100 |
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Image recording | Film or detector model: GATAN ULTRASCAN 4000 (4k x 4k) / Average electron dose: 35.0 e/Å2 |
Electron beam | Acceleration voltage: 120 kV / Electron source: LAB6 |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: OTHER |
-Image processing
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 24.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 24697 |
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Initial angle assignment | Type: PROJECTION MATCHING |
Final angle assignment | Type: PROJECTION MATCHING |