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- EMDB-76984: Consensus reconstruction of ATR-ATRIP-ETAA1 AAD(S95D/S111D) -

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Basic information

Entry
Database: EMDB / ID: EMD-76984
TitleConsensus reconstruction of ATR-ATRIP-ETAA1 AAD(S95D/S111D)
Map data
Sample
  • Complex: ATR-ATRIP-ETAA1 AAD (S95D/S111D)
Keywordskinase / PI3K-related kinase / complex / activator / replication stress response / replication checkpoint / NUCLEAR PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsLi B / Pavletich NP
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)5R01GM149915 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)P30CA008748 United States
CitationJournal: Nat Struct Mol Biol / Year: 2026
Title: Structural mechanism of TOPBP1 activating the ATR-ATRIP replication checkpoint kinase.
Authors: Buren Li / Ayat Yaseen / Nikola P Pavletich /
Abstract: The ATR protein kinase preserves genomic integrity during DNA replication by controlling checkpoints needed for the orderly progression of S phase and for the responses to replication stress. ATR, ...The ATR protein kinase preserves genomic integrity during DNA replication by controlling checkpoints needed for the orderly progression of S phase and for the responses to replication stress. ATR, with its obligate partner ATRIP, is activated by the TOPBP1 and ETAA1 proteins, which control different branches of ATR signaling. TOPBP1 is essential for induction of the S phase checkpoint in response to stalled replication forks, while ETAA1 is required for timely progression to mitosis from an unperturbed S phase. TOPBP1 and ETAA1 contain ATR-activating domains (AADs) of limited homology, but how they activate ATR has not yet been fully elucidated. Here we present the 3.0-Å cryo-EM structure of the human ATR-ATRIP complex bound to the TOPBP1 AAD, showing that TOPBP1 activates ATR by inducing a global conformational change that allosterically realigns active site residues in the kinase domain ~70 Å away. We also present the 3.3-Å structure of the ATR-ATRIP-ETAA1 AAD complex, which reveals a binding mode distinct from TOPBP1. Our data suggest that the distinct binding modes of TOPBP1 and ETAA1 contribute to the different cellular contexts and outcomes of ATR-ATRIP activation.
History
DepositionApr 30, 2026-
Header (metadata) releaseAug 5, 2026-
Map releaseAug 5, 2026-
UpdateAug 5, 2026-
Current statusAug 5, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_76984.png

Downloads & links

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Map

FileDownload / File: emd_76984.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 300 pix.
= 319.2 Å		1.06 Å/pix.
x 300 pix.
= 319.2 Å		1.06 Å/pix.
x 300 pix.
= 319.2 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.064 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.012
Minimum - Maximum-0.09108075 - 0.15923473
Average (Standard dev.)0.00029975586 (±0.00309094)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 319.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_76984_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_76984_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : ATR-ATRIP-ETAA1 AAD (S95D/S111D)

EntireName: ATR-ATRIP-ETAA1 AAD (S95D/S111D)
Components
  • Complex: ATR-ATRIP-ETAA1 AAD (S95D/S111D)

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Supramolecule #1: ATR-ATRIP-ETAA1 AAD (S95D/S111D)

SupramoleculeName: ATR-ATRIP-ETAA1 AAD (S95D/S111D) / type: complex / ID: 1 / Parent: 0
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: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 53.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.7 µm / Nominal defocus min: 0.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 5.0beta) / Number images used: 1340199
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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