1KIX

Dimeric Structure of the O. nova Telomere End Binding Protein Alpha Subunit with Bound ssDNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Dimeric structure of the Oxytricha nova telomere end-binding protein alpha-subunit bound to ssDNA.

Peersen, O.B.Ruggles, J.A.Schultz, S.C.

(2002) Nat Struct Biol 9: 182-187

  • DOI: 10.1038/nsb761
  • Primary Citation of Related Structures:  
    1KIX

  • PubMed Abstract: 
  • Telomeres are the specialized protein--DNA complexes that cap and protect the ends of linear eukaryotic chromosomes. The extreme 3' end of the telomeric DNA in Oxytricha nova is bound by a two-subunit sequence-specific and 3' end-specific protein cal ...

    Telomeres are the specialized protein--DNA complexes that cap and protect the ends of linear eukaryotic chromosomes. The extreme 3' end of the telomeric DNA in Oxytricha nova is bound by a two-subunit sequence-specific and 3' end-specific protein called the telomere end-binding protein (OnTEBP). Here we describe the crystal structure of the alpha-subunit of OnTEBP in complex with T4G4 single-stranded telomeric DNA. This structure shows an (alpha--ssDNA)2 homodimer with a large approximately 7,000 A2 protein--protein interface in which the domains of alpha are rearranged extensively from their positions in the structure of an alpha--beta--ssDNA ternary complex. The (alpha--ssDNA)2 complex can bind two telomeres on opposite sides of the dimer and, thus, acts as a protein mediator of telomere--telomere associations. The structures of the (alpha--ssDNA)2 dimer presented here and the previously described alpha--beta--ssDNA complex demonstrate that OnTEBP forms multiple telomeric complexes that potentially mediate the assembly and disassembly of higher order telomeric structures.


    Related Citations: 
    • Crystal structure of the Oxytricha nova telomere end binding protein complexed with single strand DNA
      Horvath, M.P., Schweiker, V.L., Bevilacqua, J.M., Ruggles, J.A., Schultz, S.C.
      (1998) Cell 95: 963
    • Crystal Structure of the N-terminal Domain of Oxytricha nova Telomere End-binding Protein alpha Subunit both Uncomplexed and Complexed with Telomeric ssDNA
      Classen, S., Ruggles, J.A., Schultz, S.C.
      (2001) J Mol Biol 314: 1113

    Organizational Affiliation

    University of Colorado, Department of Chemistry and Biochemistry, Boulder, Colorado 80309-0215 USA. Olve.Peersen@ColoState.edu



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Telomere-Binding Protein alpha SubunitA495Sterkiella novaMutation(s): 0 
Gene Names: MAC-56AMAC-56KMAC-56S
Find proteins for P29549 (Sterkiella nova)
Explore P29549 
Go to UniProtKB:  P29549
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    5'-D(*T*TP*TP*TP*GP*GP*GP*G)-3'D8N/A
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    SO4
    Query on SO4

    Download Ideal Coordinates CCD File 
    A
    SULFATE ION
    O4 S
    QAOWNCQODCNURD-UHFFFAOYSA-L
     Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.70 Å
    • R-Value Free: 0.240 
    • R-Value Work: 0.208 
    • R-Value Observed: 0.208 
    • Space Group: F 4 3 2
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 284α = 90
    b = 284β = 90
    c = 284γ = 90
    Software Package:
    Software NamePurpose
    X-PLORmodel building
    CNSrefinement
    DENZOdata reduction
    SCALEPACKdata scaling
    X-PLORphasing

    Structure Validation

    View Full Validation Report



    Entry History 

    Deposition Data

    Revision History 

    • Version 1.0: 2002-02-22
      Type: Initial release
    • Version 1.1: 2008-04-27
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance