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- EMDB-42388: Cryo-EM map of the human CTF18-RFC-PCNA-DNA ternary complex with ... -
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Basic information
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Title | Cryo-EM map of the human CTF18-RFC-PCNA-DNA ternary complex with narrow PCNA opening state II (state 6) | |||||||||
![]() | EM sharpen map | |||||||||
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![]() | DNA clamp loader complex / REPLICATION-DNA complex | |||||||||
Function / homology | ![]() response to organophosphorus / Elg1 RFC-like complex / DNA replication factor C complex / Ctf18 RFC-like complex / positive regulation of deoxyribonuclease activity / dinucleotide insertion or deletion binding / PCNA-p21 complex / mitotic telomere maintenance via semi-conservative replication / purine-specific mismatch base pair DNA N-glycosylase activity / MutLalpha complex binding ...response to organophosphorus / Elg1 RFC-like complex / DNA replication factor C complex / Ctf18 RFC-like complex / positive regulation of deoxyribonuclease activity / dinucleotide insertion or deletion binding / PCNA-p21 complex / mitotic telomere maintenance via semi-conservative replication / purine-specific mismatch base pair DNA N-glycosylase activity / MutLalpha complex binding / positive regulation of DNA-directed DNA polymerase activity / nuclear lamina / Polymerase switching / Telomere C-strand (Lagging Strand) Synthesis / Processive synthesis on the lagging strand / PCNA complex / Removal of the Flap Intermediate / Processive synthesis on the C-strand of the telomere / Polymerase switching on the C-strand of the telomere / Mismatch repair (MMR) directed by MSH2:MSH3 (MutSbeta) / Mismatch repair (MMR) directed by MSH2:MSH6 (MutSalpha) / Removal of the Flap Intermediate from the C-strand / Transcription of E2F targets under negative control by DREAM complex / replisome / : / HDR through Single Strand Annealing (SSA) / response to L-glutamate / Impaired BRCA2 binding to RAD51 / histone acetyltransferase binding / DNA synthesis involved in DNA repair / DNA strand elongation involved in DNA replication / DNA polymerase processivity factor activity / G1/S-Specific Transcription / leading strand elongation / replication fork processing / response to dexamethasone / nuclear replication fork / Presynaptic phase of homologous DNA pairing and strand exchange / SUMOylation of DNA replication proteins / ATP-dependent activity, acting on DNA / PCNA-Dependent Long Patch Base Excision Repair / mismatch repair / Activation of ATR in response to replication stress / translesion synthesis / response to cadmium ion / cyclin-dependent protein kinase holoenzyme complex / estrous cycle / DNA polymerase binding / base-excision repair, gap-filling / epithelial cell differentiation / positive regulation of DNA repair / TP53 Regulates Transcription of Genes Involved in G2 Cell Cycle Arrest / Translesion synthesis by REV1 / Translesion synthesis by POLK / liver regeneration / Translesion synthesis by POLI / Gap-filling DNA repair synthesis and ligation in GG-NER / positive regulation of DNA replication / replication fork / male germ cell nucleus / nuclear estrogen receptor binding / Termination of translesion DNA synthesis / Recognition of DNA damage by PCNA-containing replication complex / Translesion Synthesis by POLH / G2/M DNA damage checkpoint / HDR through Homologous Recombination (HRR) / receptor tyrosine kinase binding / Dual Incision in GG-NER / cellular response to hydrogen peroxide / DNA-templated DNA replication / Dual incision in TC-NER / Gap-filling DNA repair synthesis and ligation in TC-NER / cellular response to UV / cellular response to xenobiotic stimulus / response to estradiol / E3 ubiquitin ligases ubiquitinate target proteins / heart development / Processing of DNA double-strand break ends / Regulation of TP53 Activity through Phosphorylation / DNA clamp loader activity / damaged DNA binding / DNA replication / chromosome, telomeric region / nuclear body / DNA repair / centrosome / chromatin binding / protein-containing complex binding / chromatin / enzyme binding / negative regulation of transcription by RNA polymerase II / ATP hydrolysis activity / DNA binding / extracellular exosome / nucleoplasm / ATP binding / identical protein binding / nucleus / membrane / cytosol Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.83 Å | |||||||||
![]() | Wang F / He Q / Li H | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM reveals a nearly complete PCNA loading process and unique features of the human alternative clamp loader CTF18-RFC. Authors: Qing He / Feng Wang / Michael E O'Donnell / Huilin Li / ![]() Abstract: The DNA sliding clamp PCNA is a multipurpose platform for DNA polymerases and many other proteins involved in DNA metabolism. The topologically closed PCNA ring needs to be cracked open and loaded ...The DNA sliding clamp PCNA is a multipurpose platform for DNA polymerases and many other proteins involved in DNA metabolism. The topologically closed PCNA ring needs to be cracked open and loaded onto DNA by a clamp loader, e.g., the well-studied pentameric ATPase complex RFC (RFC1-5). The CTF18-RFC complex is an alternative clamp loader found recently to bind the leading strand DNA polymerase ε and load PCNA onto leading strand DNA, but its structure and the loading mechanism have been unknown. By cryo-EM analysis of in vitro assembled human CTF18-RFC-DNA-PCNA complex, we have captured seven loading intermediates, revealing a detailed PCNA loading mechanism onto a 3'-ss/dsDNA junction by CTF18-RFC. Interestingly, the alternative loader has evolved a highly mobile CTF18 AAA+ module likely to lower the loading activity, perhaps to avoid competition with the RFC and to limit its role to leading strand clamp loading. To compensate for the lost stability due to the mobile AAA+ module, CTF18 has evolved a unique β-hairpin motif that reaches across RFC2 to interact with RFC5, thereby stabilizing the pentameric complex. Further, we found that CTF18 also contains a separation pin to locally melt DNA from the 3'-end of the primer; this ensures its ability to load PCNA to any 3'-ss/dsDNA junction, facilitated by the binding energy of the E-plug to the major groove. Our study reveals unique structural features of the human CTF18-RFC and contributes to a broader understanding of PCNA loading by the alternative clamp loaders. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 117.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 28.7 KB 28.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 10.6 KB | Display | ![]() |
Images | ![]() | 61.6 KB | ||
Filedesc metadata | ![]() | 8.1 KB | ||
Others | ![]() ![]() ![]() ![]() | 110.8 MB 62.6 MB 116.1 MB 116.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 953.9 KB | Display | ![]() |
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Full document | ![]() | 953.5 KB | Display | |
Data in XML | ![]() | 18.9 KB | Display | |
Data in CIF | ![]() | 24.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8umyMC ![]() 8umtC ![]() 8umuC ![]() 8umvC ![]() 8umwC ![]() 8un0C ![]() 8unjC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | EM sharpen map | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.828 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Additional map: EM sharpen map by DeepEMhancer
File | emd_42388_additional_1.map | ||||||||||||
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Annotation | EM sharpen map by DeepEMhancer | ||||||||||||
Projections & Slices |
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Density Histograms |
-Additional map: Original unsharpen EM map
File | emd_42388_additional_2.map | ||||||||||||
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Annotation | Original unsharpen EM map | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: EM half map A
File | emd_42388_half_map_1.map | ||||||||||||
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Annotation | EM half map A | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: EM half map B
File | emd_42388_half_map_2.map | ||||||||||||
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Annotation | EM half map B | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
+Entire : the human clamp-clamp loader complex PCNA-CTF18
+Supramolecule #1: the human clamp-clamp loader complex PCNA-CTF18
+Macromolecule #1: Chromosome transmission fidelity protein 18 homolog
+Macromolecule #2: Replication factor C subunit 2
+Macromolecule #3: Replication factor C subunit 5
+Macromolecule #4: Replication factor C subunit 4
+Macromolecule #5: Replication factor C subunit 3
+Macromolecule #6: Proliferating cell nuclear antigen
+Macromolecule #7: DNA (40-MER)
+Macromolecule #8: DNA (20-MER)
+Macromolecule #9: MAGNESIUM ION
+Macromolecule #10: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
+Macromolecule #11: ADENOSINE-5'-DIPHOSPHATE
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.3 mg/mL |
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Buffer | pH: 7.5 |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 280 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.9000000000000001 µm / Nominal defocus min: 1.2 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: RIGID BODY FIT / Overall B value: 123 |
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Output model | ![]() PDB-8umy: |