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Open data
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Basic information
Entry | Database: PDB / ID: 8q6p | ||||||||||||||||||
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Title | X. laevis CMG dimer bound to dimeric DONSON - MCM ATPase | ||||||||||||||||||
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![]() | REPLICATION / DNA replication initiation / Xenopus egg extract / primordial dwarfism / replicative helicase / genome stability | ||||||||||||||||||
Function / homology | ![]() single-stranded 3'-5' DNA helicase activity / nuclear DNA replication / premeiotic DNA replication / mitotic 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 ...single-stranded 3'-5' DNA helicase activity / nuclear DNA replication / premeiotic DNA replication / mitotic 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 / 3'-5' DNA helicase activity / 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 damage checkpoint signaling / replication fork / single-stranded DNA binding / DNA helicase / DNA replication / cell division / chromatin binding / chromatin / ATP hydrolysis activity / ATP binding / nucleus / metal ion binding Similarity search - Function | ||||||||||||||||||
Biological species | ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.53 Å | ||||||||||||||||||
![]() | Butryn, A. / Cvetkovic, M.A. / Costa, A. | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() 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
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 519.2 KB | Display | ![]() |
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PDB format | ![]() | 323.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 18192MC ![]() 8q6oC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Assembly
Deposited unit | ![]()
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1 |
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Components
-DNA replication licensing factor ... , 4 types, 4 molecules 2457
#1: Protein | Mass: 100397.648 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#3: Protein | Mass: 97256.305 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#4: Protein | Mass: 82556.414 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#6: Protein | Mass: 81841.539 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Maternal DNA replication licensing factor ... , 2 types, 2 molecules 36
#2: Protein | Mass: 90536.500 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#5: Protein | Mass: 92752.969 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Protein / Non-polymers , 2 types, 6 molecules L![](data/chem/img/ATP.gif)
![](data/chem/img/ATP.gif)
#7: Protein | Mass: 63864.559 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#8: Chemical | ChemComp-ATP / |
-Details
Has ligand of interest | N |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: X. laevis CMG dimer bound to dimeric DONSON / Type: COMPLEX / Entity ID: #1-#7 / Source: NATURAL |
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Molecular weight | Value: 1.54 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 3400 nm / Nominal defocus min: 1300 nm |
Image recording | Electron dose: 33 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 3.53 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 144989 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
Displacement parameters | Biso mean: 121.67 Å2 | ||||||||||||||||||||||||
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