1IK9

CRYSTAL STRUCTURE OF A XRCC4-DNA LIGASE IV COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of an Xrcc4-DNA ligase IV complex.

Sibanda, B.L.Critchlow, S.E.Begun, J.Pei, X.Y.Jackson, S.P.Blundell, T.L.Pellegrini, L.

(2001) Nat.Struct.Mol.Biol. 8: 1015-1019

  • DOI: 10.1038/nsb725

  • PubMed Abstract: 
  • A complex of two proteins, Xrcc4 and DNA ligase IV, plays a fundamental role in DNA non-homologous end joining (NHEJ), a cellular function required for double-strand break repair and V(D)J recombination. Here we report the crystal structure of human ...

    A complex of two proteins, Xrcc4 and DNA ligase IV, plays a fundamental role in DNA non-homologous end joining (NHEJ), a cellular function required for double-strand break repair and V(D)J recombination. Here we report the crystal structure of human Xrcc4 bound to a polypeptide that corresponds to the DNA ligase IV sequence linking its two BRCA1 C-terminal (BRCT) domains. In the complex, a single ligase chain binds asymmetrically to an Xrcc4 dimer. The helical tails of Xrcc4 undergo a substantial conformational change relative to the uncomplexed protein, forming a coiled coil that unwinds upon ligase binding, leading to a flat interaction surface. A buried network of charged hydrogen bonds surrounded by extensive hydrophobic contacts explains the observed tightness of the interaction. The strong conservation of residues at the interface between the two proteins provides evidence that the observed mode of interaction has been maintained in NHEJ throughout evolution.


    Organizational Affiliation

    Department of Biochemistry, Cambridge University, Tennis Court Road, Cambridge CB2 1GA, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA REPAIR PROTEIN XRCC4
A, B
213Homo sapiensMutation(s): 4 
Gene Names: XRCC4
Find proteins for Q13426 (Homo sapiens)
Go to Gene View: XRCC4
Go to UniProtKB:  Q13426
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA LIGASE IV
C
37Homo sapiensMutation(s): 0 
Gene Names: LIG4
EC: 6.5.1.1
Find proteins for P49917 (Homo sapiens)
Go to Gene View: LIG4
Go to UniProtKB:  P49917
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.228 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 45.062α = 90.00
b = 79.628β = 90.00
c = 242.142γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHARPphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-11-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance