1KIX

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.240 
  • R-Value Work: 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.Mol.Biol. 9: 182-187

  • DOI: 10.1038/nsb761

  • 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 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Telomere-Binding Protein alpha Subunit
A
495Sterkiella novaGene Names: MAC-56A, MAC-56K, MAC-56S
Find proteins for P29549 (Sterkiella nova)
Go to UniProtKB:  P29549
Entity ID: 1
MoleculeChainsLengthOrganism
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 SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.208 
  • Space Group: F 4 3 2
Unit Cell:
Length (Å)Angle (°)
a = 284.000α = 90.00
b = 284.000β = 90.00
c = 284.000γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing
X-PLORmodel building
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

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