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- EMDB-39355: Structure of the human endogenous PCNA-FEN1-RNase H2 complex - State C -

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Basic information

Entry
Database: EMDB / ID: EMD-39355
TitleStructure of the human endogenous PCNA-FEN1-RNase H2 complex - State C
Map data
Sample
  • Complex: endogenous state C PCNA-DNA-FEN1-RNase H2 complex
KeywordsFlap endonuclease 1 / RNase H2 / endogenous DNA / PCNA / DNA BINDING PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 5.82 Å
AuthorsYuhui T / Ning G
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: EMBO J / Year: 2025
Title: Structural insight into Okazaki fragment maturation mediated by PCNA-bound FEN1 and RNaseH2.
Authors: Yuhui Tian / Ningning Li / Qing Li / Ning Gao /
Abstract: PCNA is a master coordinator of many DNA-metabolic events. During DNA replication, the maturation of Okazaki fragments involves at least four DNA enzymes, all of which contain PCNA-interacting motifs. ...PCNA is a master coordinator of many DNA-metabolic events. During DNA replication, the maturation of Okazaki fragments involves at least four DNA enzymes, all of which contain PCNA-interacting motifs. However, the temporal relationships and functional modulations between these PCNA-binding proteins are unclear. Here, we developed a strategy to purify endogenous PCNA-containing complexes from native chromatin, and characterized their structures using cryo-EM. Two structurally resolved classes (PCNA-FEN1 and PCNA-FEN1-RNaseH2 complexes) have captured a series of 3D snapshots for the primer-removal steps of Okazaki fragment maturation. These structures show that product release from FEN1 is a rate-liming step. Furthermore, both FEN1 and RNaseH2 undergo continuous conformational changes on PCNA that result in constant fluctuations in the bending angle of substrate DNA at the nick site, implying that these enzymes could regulate each other through conformational modulation of the bound DNA. The structures of the PCNA-FEN1-RNaseH2 complex confirm the toolbelt function of PCNA and suggests a potential unrecognized role of RNaseH2, as a dsDNA binding protein, in promoting the 5'-flap cleaving activity of FEN1.
History
DepositionMar 3, 2024-
Header (metadata) releaseDec 4, 2024-
Map releaseDec 4, 2024-
UpdateMar 12, 2025-
Current statusMar 12, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_39355.png

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Map

FileDownload / File: emd_39355.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

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AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 360 pix.
= 298.8 Å		0.83 Å/pix.
x 360 pix.
= 298.8 Å		0.83 Å/pix.
x 360 pix.
= 298.8 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.158
Minimum - Maximum-0.37551355 - 0.8166564
Average (Standard dev.)0.00083208433 (±0.031065458)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 298.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_39355_half_map_1.map
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Half map: #2

Fileemd_39355_half_map_2.map
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Sample components

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Entire : endogenous state C PCNA-DNA-FEN1-RNase H2 complex

EntireName: endogenous state C PCNA-DNA-FEN1-RNase H2 complex
Components
  • Complex: endogenous state C PCNA-DNA-FEN1-RNase H2 complex

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Supramolecule #1: endogenous state C PCNA-DNA-FEN1-RNase H2 complex

SupramoleculeName: endogenous state C PCNA-DNA-FEN1-RNase H2 complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#9
Source (natural)Organism: Homo sapiens (human)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 2.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 5.82 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 9454
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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