2QM4

Crystal structure of human XLF/Cernunnos, a non-homologous end-joining factor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of human XLF/Cernunnos reveals unexpected differences from XRCC4 with implications for NHEJ.

Li, Y.Chirgadze, D.Y.Bolanos-Garcia, V.M.Sibanda, B.L.Davies, O.R.Ahnesorg, P.Jackson, S.P.Blundell, T.L.

(2008) EMBO J 27: 290-300

  • DOI: 10.1038/sj.emboj.7601942
  • Primary Citation of Related Structures:  
    2QM4

  • PubMed Abstract: 
  • The recently characterised 299-residue human XLF/Cernunnos protein plays a crucial role in DNA repair by non-homologous end joining (NHEJ) and interacts with the XRCC4-DNA Ligase IV complex. Here, we report the crystal structure of the XLF (1-233) homodimer at 2 ...

    The recently characterised 299-residue human XLF/Cernunnos protein plays a crucial role in DNA repair by non-homologous end joining (NHEJ) and interacts with the XRCC4-DNA Ligase IV complex. Here, we report the crystal structure of the XLF (1-233) homodimer at 2.3 A resolution, confirming the predicted structural similarity to XRCC4. The XLF coiled-coil, however, is shorter than that of XRCC4 and undergoes an unexpected reverse in direction giving rise to a short distorted four helical bundle and a C-terminal helical structure wedged between the coiled-coil and head domain. The existence of a dimer as the major species is confirmed by size-exclusion chromatography, analytical ultracentrifugation, small-angle X-ray scattering and other biophysical methods. We show that the XLF structure is not easily compatible with a proposed XRCC4:XLF heterodimer. However, we demonstrate interactions between dimers of XLF and XRCC4 by surface plasmon resonance and analyse these in terms of surface properties, amino-acid conservation and mutations in immunodeficient patients. Our data are most consistent with head-to-head interactions in a 2:2:1 XRCC4:XLF:Ligase IV complex.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Cambridge, UK. jessica@cryst.bioc.cam.ac.uk



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Non-homologous end-joining factor 1A, B, C, D235Homo sapiensMutation(s): 9 
Gene Names: NHEJ1XLF
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H9Q4 (Homo sapiens)
Explore Q9H9Q4 
Go to UniProtKB:  Q9H9Q4
PHAROS:  Q9H9Q4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H9Q4
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.736α = 90
b = 92.913β = 106.22
c = 103.693γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ProDCdata collection
DENZOdata reduction
SCALEPACKdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Derived calculations, Version format compliance
  • Version 1.2: 2017-10-18
    Changes: Refinement description