Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

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

Macromolecule Content

• Total Structure Weight: 30.71 kDa 
• Atom Count: 1773 
• Residue Count: 213 
• Unique protein chains: 2

3OIQ

Crystal structure of yeast telomere protein Cdc13 OB1 and the catalytic subunit of DNA polymerase alpha Pol1

• DOI: 10.2210/pdb3OIQ/pdb

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


• Deposited: 2010-08-19 Released: 2010-11-03 
• Deposition Author(s): Sun, J., Yang, Y., Wan, K., Mao, N., Yu, T.Y., Lin, Y.C., DeZwaan, D.C., Freeman, B.C., Lin, J.J., Lue, N.F., Lei, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.273 
• R-Value Work: 0.227 

Literature

Structural bases of dimerization of yeast telomere protein Cdc13 and its interaction with the catalytic subunit of DNA polymerase alpha.

Sun, J., Yang, Y., Wan, K., Mao, N., Yu, T.Y., Lin, Y.C., Dezwaan, D.C., Freeman, B.C., Lin, J.J., Lue, N.F., Lei, M.

(2010) Cell Res 

• PubMed: 20877309 
• DOI: 10.1038/cr.2010.138
• Primary Citation of Related Structures:  
  3OIP, 3OIQ


• PubMed Abstract: 
  

Budding yeast Cdc13-Stn1-Ten1 (CST) complex plays an essential role in telomere protection and maintenance, and has been proposed to be a telomere-specific replication protein A (RPA)-like complex. Previous genetic and structural studies revealed a close resemblance between Stn1-Ten1 and RPA32-RPA14. However, the relationship between Cdc13 and RPA70, the largest subunit of RPA, has remained unclear. Here, we report the crystal structure of the N-terminal OB (oligonucleotide/oligosaccharide binding) fold of Cdc13. Although Cdc13 has an RPA70-like domain organization, the structures of Cdc13 OB folds are significantly different from their counterparts in RPA70, suggesting that they have distinct evolutionary origins. Furthermore, our structural and biochemical analyses revealed unexpected dimerization by the N-terminal OB fold and showed that homodimerization is probably a conserved feature of all Cdc13 proteins. We also uncovered the structural basis of the interaction between the Cdc13 N-terminal OB fold and the catalytic subunit of DNA polymerase α (Pol1), and demonstrated a role for Cdc13 dimerization in Pol1 binding. Analysis of the phenotypes of mutants defective in Cdc13 dimerization and Cdc13-Pol1 interaction revealed multiple mechanisms by which dimerization regulates telomere lengths in vivo. Collectively, our findings provide novel insights into the mechanisms and evolution of Cdc13.

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Organizational Affiliation: 

Howard Hughes Medical Institute, University of Michigan Medical School, 1150 W. Medical Center Drive, Ann Arbor, MI 48109, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cell division control protein 13	A	233	Saccharomyces cerevisiae	Mutation(s): 0  Gene Names: CDC13, YDL220C
Find proteins for P32797 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P32797  Go to UniProtKB:  P32797

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA polymerase alpha catalytic subunit A	B	36	Saccharomyces cerevisiae	Mutation(s): 0  EC: 2.7.7.7
Find proteins for P13382 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P13382  Go to UniProtKB:  P13382

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.273 
• R-Value Work: 0.227 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.698	α = 90
b = 72.169	β = 90
c = 57.046	γ = 90

Software Package:

Software Name	Purpose
PHASER	phasing
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-08-19 
• Released Date: 2010-11-03 
Deposition Author(s): Sun, J., Yang, Y., Wan, K., Mao, N., Yu, T.Y., Lin, Y.C., DeZwaan, D.C., Freeman, B.C., Lin, J.J., Lue, N.F., Lei, M.

Revision History 

• Version 1.0: 2010-11-03
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-11-08
  Changes: Refinement description