Crystal Structure of Human DNA ligase IV

Experimental Data Snapshot

  • Resolution: 2.84 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

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This is version 1.2 of the entry. See complete history


Structure of the catalytic region of DNA ligase IV in complex with an artemis fragment sheds light on double-strand break repair

Ochi, T.Gu, X.Blundell, T.L.

(2013) Structure 21: 672-679

  • DOI: https://doi.org/10.1016/j.str.2013.02.014
  • Primary Citation of Related Structures:  
    3W1B, 3W1G, 3W5O

  • PubMed Abstract: 

    Nonhomologous end joining (NHEJ) is central to the repair of double-stranded DNA breaks throughout the cell cycle and plays roles in the development of the immune system. Although three-dimensional structures of most components of NHEJ have been defined, those of the catalytic region of DNA ligase IV (LigIV), a specialized DNA ligase known to work in NHEJ, and of Artemis have remained unresolved. Here, we report the crystal structure at 2.4 Å resolution of the catalytic region of LigIV (residues 1-609) in complex with an Artemis peptide. We describe interactions of the DNA-binding domain of LigIV with the continuous epitope of Artemis, which, together, form a three-helix bundle. A kink in the first helix of LigIV introduced by a conserved VPF motif gives rise to a hydrophobic pocket, which accommodates a conserved tryptophan from Artemis. We provide structural insights into features of LigIV among human DNA ligases.

  • Organizational Affiliation

    Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK. to237@cam.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA ligase 4
A, B
610Homo sapiensMutation(s): 0 
Gene Names: LIG4
UniProt & NIH Common Fund Data Resources
Find proteins for P49917 (Homo sapiens)
Explore P49917 
Go to UniProtKB:  P49917
GTEx:  ENSG00000174405 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49917
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ATP

Download Ideal Coordinates CCD File 
C [auth A],
Q [auth B]
C10 H16 N5 O13 P3
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
D [auth A]
E [auth A]
F [auth A]
AA [auth B],
BA [auth B],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.84 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.29α = 90
b = 104.36β = 94.08
c = 120.04γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-03
    Type: Initial release
  • Version 1.1: 2013-08-14
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description