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- PDB-8qj7: Cryo-EM structure of human DNA polymerase alpha-primase in pre-in... -
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Basic information
Entry | Database: PDB / ID: 8qj7 | ||||||
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Title | Cryo-EM structure of human DNA polymerase alpha-primase in pre-initiation stage 1 | ||||||
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![]() | DNA BINDING PROTEIN / DNA polymerase / complex | ||||||
Function / homology | ![]() positive regulation of DNA primase activity / DNA primase AEP / ribonucleotide binding / DNA replication initiation / DNA/RNA hybrid binding / Telomere C-strand synthesis initiation / Inhibition of replication initiation of damaged DNA by RB1/E2F1 / alpha DNA polymerase:primase complex / regulation of type I interferon production / Polymerase switching ...positive regulation of DNA primase activity / DNA primase AEP / ribonucleotide binding / DNA replication initiation / DNA/RNA hybrid binding / Telomere C-strand synthesis initiation / Inhibition of replication initiation of damaged DNA by RB1/E2F1 / alpha DNA polymerase:primase complex / regulation of type I interferon production / Polymerase switching / Processive synthesis on the lagging strand / DNA primase activity / Removal of the Flap Intermediate / Polymerase switching on the C-strand of the telomere / primosome complex / lagging strand elongation / DNA replication, synthesis of primer / mitotic DNA replication initiation / DNA strand elongation involved in DNA replication / DNA synthesis involved in DNA repair / G1/S-Specific Transcription / leading strand elongation / DNA replication origin binding / Activation of the pre-replicative complex / DNA replication initiation / Defective pyroptosis / nuclear matrix / double-strand break repair via nonhomologous end joining / protein import into nucleus / nuclear envelope / single-stranded DNA binding / 4 iron, 4 sulfur cluster binding / DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA repair / nucleotide binding / chromatin binding / chromatin / nucleolus / protein kinase binding / magnesium ion binding / DNA binding / zinc ion binding / nucleoplasm / membrane / nucleus / metal ion binding / cytosol Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.07 Å | ||||||
![]() | Yin, Z. / Pellegrini, L. | ||||||
Funding support | ![]()
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![]() | ![]() Title: CryoEM insights into RNA primer synthesis by the human primosome. Authors: Zhan Yin / Mairi L Kilkenny / De-Sheng Ker / Luca Pellegrini / ![]() Abstract: Eukaryotic DNA replication depends on the primosome - a complex of DNA polymerase alpha (Pol α) and primase - to initiate DNA synthesis by polymerisation of an RNA-DNA primer. Primer synthesis ...Eukaryotic DNA replication depends on the primosome - a complex of DNA polymerase alpha (Pol α) and primase - to initiate DNA synthesis by polymerisation of an RNA-DNA primer. Primer synthesis requires the tight coordination of primase and polymerase activities. Recent cryo-electron microscopy (cryoEM) analyses have elucidated the extensive conformational transitions required for RNA primer handover between primase and Pol α and primer elongation by Pol α. Because of the intrinsic flexibility of the primosome, however, structural information about the initiation of RNA primer synthesis is still lacking. Here, we capture cryoEM snapshots of the priming reaction to reveal the conformational trajectory of the human primosome that brings DNA primase subunits 1 and 2 (PRIM1 and PRIM2, respectively) together, poised for RNA synthesis. Furthermore, we provide experimental evidence for the continuous association of primase subunit PRIM2 with the RNA primer during primer synthesis, and for how both initiation and termination of RNA primer polymerisation are licenced by specific rearrangements of DNA polymerase alpha catalytic subunit (POLA1), the polymerase subunit of Pol α. Our findings fill a critical gap in our understanding of the conformational changes that underpin the synthesis of the RNA primer by the primosome. Together with existing evidence, they provide a complete description of the structural dynamics of the human primosome during DNA replication initiation. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 915.2 KB | Display | ![]() |
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PDB format | ![]() | 750.2 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 17795MC 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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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein , 2 types, 2 molecules CD
#1: Protein | Mass: 49981.012 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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#4: Protein | Mass: 58890.918 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
-DNA polymerase alpha ... , 2 types, 2 molecules AB
#2: Protein | Mass: 166131.094 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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#3: Protein | Mass: 66015.539 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
-Non-polymers , 4 types, 7 molecules ![](data/chem/img/ZN.gif)
![](data/chem/img/MN.gif)
![](data/chem/img/ATP.gif)
![](data/chem/img/SF4.gif)
![](data/chem/img/MN.gif)
![](data/chem/img/ATP.gif)
![](data/chem/img/SF4.gif)
#5: Chemical | #6: Chemical | #7: Chemical | ChemComp-ATP / | #8: Chemical | ChemComp-SF4 / | |
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-Details
Has ligand of interest | Y |
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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: Tetrameric complex of DNA polymerase alpha-primase bound with nucleotide Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT |
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Molecular weight | Value: 0.2875 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Conc.: 0.29 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | 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: 2600 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 47.78 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 3.07 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1850009 / Symmetry type: POINT | ||||||||||||||||||||||||
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