Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density

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

Biological assembly 2 assigned by authors.

Biological Assembly 3  

 3D View: Structure | Electron Density

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

Biological assembly 3 assigned by authors.

Macromolecule Content

• Total Structure Weight: 70.87 kDa 
• Atom Count: 4048 
• Residue Count: 475 
• Unique protein chains: 1

2B2A

Crystal Structure of the TEN domain of the Telomerase Reverse Transcriptase

• DOI: 10.2210/pdb2B2A/pdb

• Classification: TRANSFERASE
• Organism(s): Tetrahymena thermophila
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2005-09-18 Released: 2006-02-07 
• Deposition Author(s): Jacobs, S.A., Podell, E.R., Cech, T.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.22 Å
• R-Value Free: 0.258 
• R-Value Work: 0.238 
• R-Value Observed: 0.238 

Literature

Crystal structure of the essential N-terminal domain of telomerase reverse transcriptase.

Jacobs, S.A., Podell, E.R., Cech, T.R.

(2006) Nat Struct Mol Biol 13: 218-225

• PubMed: 16462747 
• DOI: 10.1038/nsmb1054
• Primary Citation of Related Structures:  
  2B2A


• PubMed Abstract: 
  

Telomerase, a ribonucleoprotein enzyme, adds telomeric DNA repeats to the ends of linear chromosomes. Here we report the first high-resolution structure of any portion of the telomerase reverse transcriptase, the telomerase essential N-terminal (TEN) domain from Tetrahymena thermophila. The structure, which seems to represent a novel protein fold, shows phylogenetically conserved amino acid residues in a groove on its surface. These residues are crucial for telomerase catalytic activity, and several of them are required for sequence-specific binding of a single-stranded telomeric DNA primer. The positively charged C terminus, which becomes ordered upon interaction with other macromolecules, is involved in binding RNA in a non-sequence-specific manner. The TEN domain's ability to bind both RNA and telomeric DNA, coupled with the notably strong effects on activity upon mutagenesis of single surface residues, suggest how this domain contributes to telomerase catalysis.

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Organizational Affiliation: 

Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Telomerase reverse transcriptase	A, B, C	199	Tetrahymena thermophila	Mutation(s): 1  Gene Names: TERT EC: 2.7.7.49
Find proteins for O77448 (Tetrahymena thermophila (strain SB210)) Explore O77448  Go to UniProtKB:  O77448

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.22 Å
• R-Value Free: 0.258 
• R-Value Work: 0.238 
• R-Value Observed: 0.238 
• Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 111.1	α = 90
b = 111.1	β = 90
c = 42.16	γ = 120

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-09-18 
• Released Date: 2006-02-07 
Deposition Author(s): Jacobs, S.A., Podell, E.R., Cech, T.R.

Revision History 

• Version 1.0: 2006-02-07
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance