4JOI

Crystal structure of the human telomeric Stn1-Ten1 complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


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


Literature

Structure of the human telomeric stn1-ten1 capping complex.

Bryan, C., Rice, C., Harkisheimer, M., Schultz, D.C., Skordalakes, E.

(2013) PLoS One 8: e66756-e66756

  • DOI: 10.1371/journal.pone.0066756
  • Primary Citation of Related Structures:  
    4JOI, 4JQF

  • PubMed Abstract: 

    • The identification of the human homologue of the yeast CST in 2009 posed a new challenge in our understanding of the mechanism of telomere capping in higher eukaryotes. The high-resolution structure of the human Stn1-Ten1 (hStn1-Ten1) complex presented here reveals that hStn1 consists of an OB domain and tandem C-terminal wHTH motifs, while hTen1 consists of a single OB fold ...

    The identification of the human homologue of the yeast CST in 2009 posed a new challenge in our understanding of the mechanism of telomere capping in higher eukaryotes. The high-resolution structure of the human Stn1-Ten1 (hStn1-Ten1) complex presented here reveals that hStn1 consists of an OB domain and tandem C-terminal wHTH motifs, while hTen1 consists of a single OB fold. Contacts between the OB domains facilitate formation of a complex that is strikingly similar to the replication protein A (RPA) and yeast Stn1-Ten1 (Ten1) complexes. The hStn1-Ten1 complex exhibits non-specific single-stranded DNA activity that is primarily dependent on hStn1. Cells expressing hStn1 mutants defective for dimerization with hTen1 display elongated telomeres and telomere defects associated with telomere uncapping, suggesting that the telomeric function of hCST is hTen1 dependent. Taken together the data presented here show that the structure of the hStn1-Ten1 subcomplex is conserved across species. Cell based assays indicate that hTen1 is critical for the telomeric function of hCST, both in telomere protection and downregulation of telomerase function.

    Organizational Affiliation: 

    Gene Expression and Regulation Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CST complex subunit STN1A, B166Homo sapiensMutation(s): 0 
Gene Names: OBFC1, STN1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H668 (Homo sapiens)
Explore Q9H668 
Go to UniProtKB:  Q9H668
PHAROS:  Q9H668
GTEx:  ENSG00000107960 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H668
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CST complex subunit TEN1D [auth C],
C [auth D]		122Homo sapiensMutation(s): 0 
Gene Names: TEN1, C17orf106
UniProt & NIH Common Fund Data Resources
Find proteins for Q86WV5 (Homo sapiens)
Explore Q86WV5 
Go to UniProtKB:  Q86WV5
GTEx:  ENSG00000257949 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ86WV5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.613α = 90
b = 58.101β = 90
c = 87.458γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
SOLVEphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-29
    Type: Initial release
  • Version 1.1: 2013-06-05
    Changes: Other
  • Version 1.2: 2013-07-24
    Changes: Database references