5DOK | pdb_00005dok

Crystal structure of Tetrahymena p45C

• PDB DOI: https://doi.org/10.2210/pdb5DOK/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Tetrahymena thermophila
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2015-09-11 Released: 2015-11-25 
• Deposition Author(s): Wan, B., Tang, T., Wu, J., Lei, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.276 (Depositor), 0.279 (DCC) 
• R-Value Work: 
  0.223 (Depositor), 0.227 (DCC) 
• R-Value Observed: 
  0.226 (Depositor) 

Literature

The Tetrahymena telomerase p75-p45-p19 subcomplex is a unique CST complex

Wan, B., Tang, T., Upton, H., Shuai, J., Zhou, Y., Li, S., Chen, J., Brunzelle, J.S., Zeng, Z., Collins, K., Wu, J., Lei, M.

(2015) Nat Struct Mol Biol 22: 1023-1026

• PubMed: 26551074 
• DOI: https://doi.org/10.1038/nsmb.3126
• Primary Citation Related Structures: 
  5DOF, 5DOI, 5DOK


• PubMed Abstract: 
  

  Tetrahymena telomerase holoenzyme subunits p75, p45 and p19 form a subcomplex (7-4-1) peripheral to the catalytic core. We report structures of p45 and p19 and reveal them as the Stn1 and Ten1 subunits of the CST complex, which stimulates telomerase complementary-strand synthesis. 7-4-1 binds telomeric single-stranded DNA, and mutant p19 overexpression causes telomere 3'-overhang elongation. We propose that telomerase-tethered Tetrahymena CST coordinates telomere G-strand and C-strand synthesis.

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Organizational Affiliation: 
• National Center for Protein Science Shanghai, State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.
Shanghai Science Research Center, Chinese Academy of Sciences, Shanghai, China.
School of Life Science and Technology, ShanghaiTech University, Shanghai, China.
Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, USA.
College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China.
Northwestern University Center for Synchrotron Research, Life Sciences Collaborative Access Team, Argonne, Illinois, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Biological Assembly 3  

Global Symmetry: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 3 generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 48.03 kDa 
• Atom Count: 2,884 
• Modeled Residue Count: 339 
• Deposited Residue Count: 408 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Telomerase associated protein p45	A, B	204	Tetrahymena thermophila	Mutation(s): 0  Gene Names: TAP45
UniProt
Find proteins for Q6JXI5 (Tetrahymena thermophila (strain SB210)) Explore Q6JXI5  Go to UniProtKB:  Q6JXI5

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MG	C [auth A], D [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.276 (Depositor), 0.279 (DCC) 
• R-Value Work:  0.223 (Depositor), 0.227 (DCC) 
• R-Value Observed: 0.226 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 75.999	α = 90
b = 89.051	β = 108.64
c = 75.888	γ = 90

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
Coot	model building
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-11-25 
Deposition Author(s): Wan, B., Tang, T., Wu, J., Lei, M.

Revision History  

• Version 1.0: 2015-11-25
  Type: Initial release
  
• Version 1.1: 2015-12-23
  Changes: Database references
• Version 1.2: 2024-03-20
  Changes: Data collection, Database references, Derived calculations