Crystal structure of telomere capping protein Stn1 from Saccharomyces cerevisiae

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.301 
  • R-Value Work: 0.246 

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Telomere capping proteins are structurally related to RPA with an additional telomere-specific domain.

Gelinas, A.D.Paschini, M.Reyes, F.E.Heroux, A.Batey, R.T.Lundblad, V.Wuttke, D.S.

(2009) Proc Natl Acad Sci U S A 106: 19298-19303

  • DOI: https://doi.org/10.1073/pnas.0909203106
  • Primary Citation of Related Structures:  
    3K0X, 3K10

  • PubMed Abstract: 

    Telomeres must be capped to preserve chromosomal stability. The conserved Stn1 and Ten1 proteins are required for proper capping of the telomere, although the mechanistic details of how they contribute to telomere maintenance are unclear. Here, we report the crystal structures of the C-terminal domain of the Saccharomyces cerevisiae Stn1 and the Schizosaccharomyces pombe Ten1 proteins. These structures reveal striking similarities to corresponding subunits in the replication protein A complex, further supporting an evolutionary link between telomere maintenance proteins and DNA repair complexes. Our structural and in vivo data of Stn1 identify a new domain that has evolved to support a telomere-specific role in chromosome maintenance. These findings endorse a model of an evolutionarily conserved mechanism of DNA maintenance that has developed as a result of increased chromosomal structural complexity.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Colorado, UCB 215, Boulder, CO 80309-0125, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein STN1179Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: D4456STN1YD8554.15YDR082W
Find proteins for P38960 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P38960 
Go to UniProtKB:  P38960
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38960
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.301 
  • R-Value Work: 0.246 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.709α = 90
b = 52.709β = 90
c = 186.552γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description