The Three-Dimensional Structure of the C-terminal DNA Binding Domain of Human Ku70

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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The three-dimensional structure of the C-terminal DNA-binding domain of human Ku70.

Zhang, Z.Zhu, L.Lin, D.Chen, F.Chen, D.J.Chen, Y.

(2001) J Biol Chem 276: 38231-38236

  • DOI: https://doi.org/10.1074/jbc.M105238200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The proteins Ku70 (69.8 kDa) and Ku80 (82.7 kDa) form a heterodimeric complex that is an essential component of the nonhomologous end joining DNA double-strand break repair pathway in mammalian cells. Interaction of Ku with DNA is central for the functions of Ku. Ku70, which is mainly responsible for the DNA binding activity of the Ku heterodimer, contains two DNA-binding domains. We have solved the solution structure of the Ku80-independent DNA-binding domain of Ku70 encompassing residues 536-609 using nuclear magnetic resonance spectroscopy. Residues 536-560 are highly flexible and have a random structure but form specific interactions with DNA. Residues 561-609 of Ku70 form a well defined structure with 3 alpha-helices and also interact with DNA. The three-dimensional structure indicates that all conserved hydrophobic residues are in the hydrophobic core and therefore may be important for structural integrity. Most of the conserved positively charged residues are likely to be critical for DNA recognition. The C-terminal DNA-binding domain of Ku70 contains a helix-extended strand-helix motif, which occurs in other nucleic acid-binding proteins and may represent a common nucleic acid binding motif.

  • Organizational Affiliation

    Division of Immunology, Beckman Research Institute of the City of Hope, Duarte, California 91010, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
THYROID AUTOANTIGEN151Homo sapiensMutation(s): 0 
Gene Names: Ku70
UniProt & NIH Common Fund Data Resources
Find proteins for P12956 (Homo sapiens)
Explore P12956 
Go to UniProtKB:  P12956
GTEx:  ENSG00000196419 
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UniProt GroupP12956
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection