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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-1832 | |||||||||
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Title | Drosophila melanogaster CMG complex bound to ADP.BeF3 | |||||||||
![]() | Volume file of the ADP.BeF3-bound CMG complex | |||||||||
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![]() | AAA+ ATPase / Helicase / DNA replication | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / Resolution: 28.0 Å | |||||||||
![]() | Costa A / Ilves I / Tamberg N / Petojevic T / Nogales E / Botchan MR / Berger JM | |||||||||
![]() | ![]() Title: The structural basis for MCM2-7 helicase activation by GINS and Cdc45. Authors: Alessandro Costa / Ivar Ilves / Nele Tamberg / Tatjana Petojevic / Eva Nogales / Michael R Botchan / James M Berger / ![]() Abstract: Two central steps for initiating eukaryotic DNA replication involve loading of the Mcm2-7 helicase onto double-stranded DNA and its activation by GINS-Cdc45. To better understand these events, we ...Two central steps for initiating eukaryotic DNA replication involve loading of the Mcm2-7 helicase onto double-stranded DNA and its activation by GINS-Cdc45. To better understand these events, we determined the structures of Mcm2-7 and the CMG complex by using single-particle electron microscopy. Mcm2-7 adopts two conformations--a lock-washer-shaped spiral state and a planar, gapped-ring form--in which Mcm2 and Mcm5 flank a breach in the helicase perimeter. GINS and Cdc45 bridge this gap, forming a topologically closed assembly with a large interior channel; nucleotide binding further seals off the discontinuity between Mcm2 and Mcm5, partitioning the channel into two smaller pores. Together, our data help explain how GINS and Cdc45 activate Mcm2-7, indicate that Mcm2-7 loading may be assisted by a natural predisposition of the hexamer to form open rings, and suggest a mechanism by which the CMG complex assists DNA strand separation. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 348.4 KB | ![]() | |
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Header (meta data) | ![]() ![]() | 17.5 KB 17.5 KB | Display Display | ![]() |
Images | ![]() | 135.1 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 208.9 KB | Display | ![]() |
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Full document | ![]() | 208 KB | Display | |
Data in XML | ![]() | 4.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Volume file of the ADP.BeF3-bound CMG complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 5.7 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
+Entire : Drosophila melanogaster CMG complex bound to ADP.BeF3
+Supramolecule #1000: Drosophila melanogaster CMG complex bound to ADP.BeF3
+Macromolecule #1: Mcm2
+Macromolecule #2: Mcm3
+Macromolecule #3: Mcm4
+Macromolecule #4: Mcm5
+Macromolecule #5: Mcm6
+Macromolecule #6: Mcm7
+Macromolecule #7: Psf1
+Macromolecule #8: Psf2
+Macromolecule #9: Psf3
+Macromolecule #10: Sld5
+Macromolecule #11: Cdc45
-Experimental details
-Structure determination
![]() | single particle reconstruction |
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Aggregation state | particle |
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Sample preparation
Vitrification | Cryogen name: NONE / Instrument: OTHER |
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Electron microscopy
Microscope | FEI TECNAI 12 |
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Image recording | Category: CCD / Film or detector model: GENERIC GATAN / Average electron dose: 20 e/Å2 / Bits/pixel: 8 |
Electron beam | Acceleration voltage: 120 kV / Electron source: LAB6 |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal magnification: 30000 |
Sample stage | Specimen holder: Eucentric / Specimen holder model: SIDE ENTRY, EUCENTRIC |
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Image processing
Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 28.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: Spider |
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