5YZ0 image
Entry Detail
PDB ID:
5YZ0
EMDB ID:
Keywords:
Title:
Cryo-EM Structure of human ATR-ATRIP complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-12-11
Release Date:
2018-01-31
Method Details:
Experimental Method:
Resolution:
4.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Serine/threonine-protein kinase ATR
Chain IDs:A, B
Chain Length:2644
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:ATR-interacting protein
Chain IDs:C, D
Chain Length:791
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Cryo-EM structure of human ATR-ATRIP complex.
Cell Res. 28 143 156 (2018)
PMID: 29271416 DOI: 10.1038/cr.2017.158

Abstact

ATR (ataxia telangiectasia-mutated and Rad3-related) protein kinase and ATRIP (ATR-interacting protein) form a complex and play a critical role in response to replication stress and DNA damage. Here, we determined the cryo-electron microscopy (EM) structure of the human ATR-ATRIP complex at 4.7 Å resolution and built an atomic model of the C-terminal catalytic core of ATR (residues 1 521-2 644) at 3.9 Å resolution. The complex adopts a hollow "heart" shape, consisting of two ATR monomers in distinct conformations. The EM map for ATRIP reveals 14 HEAT repeats in an extended "S" shape. The conformational flexibility of ATR allows ATRIP to properly lock the N-termini of the two ATR monomers to favor ATR-ATRIP complex formation and functional diversity. The isolated "head-head" and "tail-tail" each adopts a pseudo 2-fold symmetry. The catalytic pockets face outward and substrate access is not restricted by inhibitory elements. Our studies provide a structural basis for understanding the assembly of the ATR-ATRIP complex and a framework for characterizing ATR-mediated DNA repair pathways.

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Primary Citation of related structures