1K8G

Crystal Structure of the N-terminal domain of Oxytricha nova telomere end binding protein alpha subunit both uncomplexed and complexed with telomeric ssDNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 

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This is version 1.2 of the entry. See complete history. 


Literature

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: 1113-1125

  • DOI: 10.1006/jmbi.2000.5191
  • Primary Citation of Related Structures:  
    1K8G

  • PubMed Abstract: 

    • Oxytricha nova telomere end-binding protein specifically recognizes and caps single strand (T(4)G(4))(n) telomeric DNA at the very 3'-ends of O. nova macronuclear chromosomes. Proteins homologous to the N-terminal domain of OnTEBP alpha subunit have now been identified in Oxytricha trifallax, Stylonychia mytilis, Euplotes crassus, Schizosaccharomyces pombe, and Homo sapiens, suggesting that this protein is widely distributed in eukaryotes ...

    Oxytricha nova telomere end-binding protein specifically recognizes and caps single strand (T(4)G(4))(n) telomeric DNA at the very 3'-ends of O. nova macronuclear chromosomes. Proteins homologous to the N-terminal domain of OnTEBP alpha subunit have now been identified in Oxytricha trifallax, Stylonychia mytilis, Euplotes crassus, Schizosaccharomyces pombe, and Homo sapiens, suggesting that this protein is widely distributed in eukaryotes. We describe here the crystal structures of the N-terminal single-stranded DNA (ssDNA)-binding domain of O. nova telomere end-binding protein alpha subunit both uncomplexed and complexed with single strand telomeric DNA. These structures show how the N-terminal domain of alpha alone, in the absence of the beta subunit and without alpha dimerization, can bind single-stranded telomeric DNA in a sequence-specific and 3'-end-specific manner. Furthermore, comparison of the uncomplexed and complexed forms of this protein shows that the ssDNA-binding site is largely pre-organized in the absence of ssDNA with modest, but interesting, rearrangements of amino acid side-chains that compose the ssDNA-binding site. The structures described here extend our understanding of structures of O. nova telomeric complexes by adding uncomplexed and complexed forms of monomeric alpha to previously described structures for (alpha 56/ssDNA)(2) dimer and alpha 56/beta 28/ssDNA ternary complexes. We believe that each of these four structures represent intermediates in an ordered assembly/disassembly pathway for O. nova telomeric complexes.

    Organizational Affiliation: 

    Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215, USA. classen@uclink4.berkeley.edu



Macromolecules

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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Telomere-Binding Protein alpha Subunit A, B, C320Sterkiella novaMutation(s): 0 
Gene Names: MAC-56A, MAC-56K, MAC-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(TP*TP*GP*GP*GP*G)-3'D, E6N/A
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.60 Å
    • R-Value Free: 0.285 
    • R-Value Work: 0.246 
    • R-Value Observed: 0.246 
    • Space Group: P 32 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 121.182α = 90
    b = 121.182β = 90
    c = 137.169γ = 120
    Software Package:
    Software NamePurpose
    CNSrefinement
    DENZOdata reduction
    SCALEPACKdata scaling
    CNSphasing

    Structure Validation

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    View more in-depth experimental data

    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2001-12-20
      Type: Initial release
    • Version 1.1: 2008-04-27
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance