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- EMDB-24618: Archaeal DNA ligase and heterotrimeric PCNA in complex with non-l... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-24618 | |||||||||
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Title | Archaeal DNA ligase and heterotrimeric PCNA in complex with non-ligatable DNA | |||||||||
![]() | Sharpened map | |||||||||
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![]() | DNA ligase / PCNA / cryo-EM / LIGASE-DNA complex | |||||||||
Function / homology | ![]() DNA ligase (ATP) / DNA ligase (ATP) activity / : / lagging strand elongation / DNA biosynthetic process / DNA polymerase processivity factor activity / leading strand elongation / regulation of DNA replication / DNA recombination / cell division ...DNA ligase (ATP) / DNA ligase (ATP) activity / : / lagging strand elongation / DNA biosynthetic process / DNA polymerase processivity factor activity / leading strand elongation / regulation of DNA replication / DNA recombination / cell division / DNA repair / DNA binding / ATP binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.16 Å | |||||||||
![]() | Sverzhinsky A / Pascal JM | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structures and biochemical insights into heterotrimeric PCNA regulation of DNA ligase. Authors: Aleksandr Sverzhinsky / Alan E Tomkinson / John M Pascal / ![]() ![]() Abstract: DNA ligases act in the final step of many DNA repair pathways and are commonly regulated by the DNA sliding clamp proliferating cell nuclear antigen (PCNA), but there are limited insights into the ...DNA ligases act in the final step of many DNA repair pathways and are commonly regulated by the DNA sliding clamp proliferating cell nuclear antigen (PCNA), but there are limited insights into the physical basis for this regulation. Here, we use single-particle cryoelectron microscopy (cryo-EM) to analyze an archaeal DNA ligase and heterotrimeric PCNA in complex with a single-strand DNA break. The cryo-EM structures highlight a continuous DNA-binding surface formed between DNA ligase and PCNA that supports the distorted conformation of the DNA break undergoing repair and contributes to PCNA stimulation of DNA ligation. DNA ligase is conformationally flexible within the complex, with its domains fully ordered only when encircling the repaired DNA to form a stacked ring structure with PCNA. The structures highlight DNA ligase structural transitions while docked on PCNA, changes in DNA conformation during ligation, and the potential for DNA ligase domains to regulate PCNA accessibility to other repair factors. | |||||||||
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 | ![]() | 21.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 23.6 KB 23.6 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 8.6 KB | Display | ![]() |
Images | ![]() | 144.4 KB | ||
Filedesc metadata | ![]() | 7.2 KB | ||
Others | ![]() | 18.8 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 381.8 KB | Display | ![]() |
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Full document | ![]() | 381.3 KB | Display | |
Data in XML | ![]() | 8.8 KB | Display | |
Data in CIF | ![]() | 11.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7rpoMC ![]() 7rpwC ![]() 7rpxC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Sharpened map | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.5 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: #1
File | emd_24618_additional_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : Ternary complex of DNA Ligase with PCNA1-2-3 and non-ligatable DNA
+Supramolecule #1: Ternary complex of DNA Ligase with PCNA1-2-3 and non-ligatable DNA
+Macromolecule #1: DNA polymerase sliding clamp 1
+Macromolecule #2: DNA polymerase sliding clamp 2
+Macromolecule #3: DNA polymerase sliding clamp 3
+Macromolecule #7: DNA ligase
+Macromolecule #4: Upstream strand DNA
+Macromolecule #5: Downstream strand DNA
+Macromolecule #6: Template strand DNA
+Macromolecule #8: MANGANESE (II) ION
+Macromolecule #9: ADENOSINE MONOPHOSPHATE
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.175 mg/mL |
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Buffer | pH: 7.5 |
Grid | Model: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 15 sec. / Pretreatment - Atmosphere: AIR |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV Details: wait time 0, blot force 1, blot time 1, drain time 0. |
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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) / Number grids imaged: 1 / Number real images: 3014 / Average electron dose: 100.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model |
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Refinement | Protocol: RIGID BODY FIT | ||||||||||||
Output model | ![]() PDB-7rpo: |