Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.224 

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Structure of an XRCC1 BRCT domain: a new protein-protein interaction module.

Zhang, X.Morera, S.Bates, P.A.Whitehead, P.C.Coffer, A.I.Hainbucher, K.Nash, R.A.Sternberg, M.J.Lindahl, T.Freemont, P.S.

(1998) EMBO J 17: 6404-6411

  • DOI: https://doi.org/10.1093/emboj/17.21.6404
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The BRCT domain (BRCA1 C-terminus), first identified in the breast cancer suppressor protein BRCA1, is an evolutionarily conserved protein-protein interaction region of approximately 95 amino acids found in a large number of proteins involved in DNA repair, recombination and cell cycle control. Here we describe the first three-dimensional structure and fold of a BRCT domain determined by X-ray crystallography at 3.2 A resolution. The structure has been obtained from the C-terminal region of the human DNA repair protein XRCC1, and comprises a four-stranded parallel beta-sheet surrounded by three alpha-helices, which form an autonomously folded domain. The compact XRCC1 structure explains the observed sequence homology between different BRCT motifs and provides a framework for modelling other BRCT domains. Furthermore, the established structure of an XRCC1 BRCT homodimer suggests potential protein-protein interaction sites for the complementary BRCT domain in DNA ligase III, since these two domains form a stable heterodimeric complex. Based on the XRCC1 BRCT structure, we have constructed a model for the C-terminal BRCT domain of BRCA1, which frequently is mutated in familial breast and ovarian cancer. The model allows insights into the effects of such mutations on the fold of the BRCT domain.

  • Organizational Affiliation

    Molecular Structure and Function, Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (DNA-REPAIR PROTEIN XRCC1)96Homo sapiensMutation(s): 0 
Gene Names: XRCC1
UniProt & NIH Common Fund Data Resources
Find proteins for P18887 (Homo sapiens)
Explore P18887 
Go to UniProtKB:  P18887
PHAROS:  P18887
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP18887
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.224 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.8α = 90
b = 100.8β = 90
c = 72.5γ = 120
Software Package:
Software NamePurpose
CCP4model building
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-02-28
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance