Crystal structure of the Helicase domain of human DNA polymerase theta, apo-form

Experimental Data Snapshot

  • Resolution: 3.55 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 

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Structure of the Helicase Domain of DNA Polymerase Theta Reveals a Possible Role in the Microhomology-Mediated End-Joining Pathway.

Newman, J.A.Cooper, C.D.O.Aitkenhead, H.Gileadi, O.

(2015) Structure 23: 2319

  • DOI: https://doi.org/10.1016/j.str.2015.10.014
  • Primary Citation of Related Structures:  
    5A9F, 5A9J, 5AGA

  • PubMed Abstract: 

    DNA polymerase theta (Polθ) has been identified as a crucial alternative non-homologous end-joining factor in mammalian cells. Polθ is upregulated in a range of cancer cell types defective in homologous recombination, and knockdown has been shown to inhibit cell survival in a subset of these, making it an attractive target for cancer treatment. We present crystal structures of the helicase domain of human Polθ in the presence and absence of bound nucleotides, and a characterization of its DNA-binding and DNA-stimulated ATPase activities. Comparisons with related helicases from the Hel308 family identify several unique features. Polθ exists as a tetramer both in the crystals and in solution. We propose a model for DNA binding to the Polθ helicase domain in the context of the Polθ tetramer, which suggests a role for the helicase domain in strand annealing of DNA templates for subsequent processing by the polymerase domain.

  • Organizational Affiliation

    Structural Genomics Consortium, University of Oxford, ORCRB, Roosevelt Drive, Oxford OX3 7DQ, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
896Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O75417 (Homo sapiens)
Explore O75417 
Go to UniProtKB:  O75417
PHAROS:  O75417
GTEx:  ENSG00000051341 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75417
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.55 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.017α = 90
b = 130.531β = 100.77
c = 160.91γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-16
    Type: Initial release
  • Version 1.1: 2024-01-10
    Changes: Data collection, Database references, Other, Refinement description