3K10 | pdb_00003k10

Crystal structure of telomere capping protein Stn1 from Saccharomyces cerevisiae

• PDB DOI: https://doi.org/10.2210/pdb3K10/pdb

• Classification: PROTEIN BINDING
• Organism(s): Saccharomyces cerevisiae
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-09-25 Released: 2009-10-27 
• Deposition Author(s): Gelinas, A.D., Reyes, F.E., Batey, R.T., Wuttke, D.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 
  0.301 (Depositor), 0.293 (DCC) 
• R-Value Work: 
  0.246 (Depositor), 0.255 (DCC) 

Literature

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

• PubMed: 19884503 
• DOI: https://doi.org/10.1073/pnas.0909203106
• Primary Citation 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.

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

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 20.56 kDa 
• Atom Count: 1,494 
• Modeled Residue Count: 170 
• Deposited Residue Count: 179 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein STN1	A	179	Saccharomyces cerevisiae	Mutation(s): 0  Gene Names: D4456, STN1, YD8554.15, YDR082W
UniProt
Find proteins for P38960 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P38960  Go to UniProtKB:  P38960

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free:  0.301 (Depositor), 0.293 (DCC) 
• R-Value Work:  0.246 (Depositor), 0.255 (DCC) 

Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.709	α = 90
b = 52.709	β = 90
c = 186.552	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
RESOLVE	phasing
CNS	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-10-27 
Deposition Author(s): Gelinas, A.D., Reyes, F.E., Batey, R.T., Wuttke, D.S.

Revision History  

• 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
• Version 1.3: 2024-11-06
  Changes: Data collection, Database references, Structure summary