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: 78.11 kDa 
• Atom Count: 5,535 
• Modelled Residue Count: 620 
• Deposited Residue Count: 620 
• Unique protein chains: 1
• Unique hybrid chains: 1

 3KYL

Structure of the catalytic subunit of telomerase bound to its RNA template and telomeric DNA

• PDB DOI: 10.2210/pdb3KYL/pdb
• NDB: NA0403

• Classification: NUCLEIC ACID BINDING PROTEIN/DNA/RNA
• Organism(s): Tribolium castaneum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-12-06 Released: 2010-03-31 
• Deposition Author(s): Skordalakes, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.287 
• R-Value Work: 0.242 
• R-Value Observed: 0.245 

Literature

Structural basis for telomerase catalytic subunit TERT binding to RNA template and telomeric DNA.

Mitchell, M., Gillis, A., Futahashi, M., Fujiwara, H., Skordalakes, E.

(2010) Nat Struct Mol Biol 17: 513-518

• PubMed: 20357774 
• DOI: 10.1038/nsmb.1777
• Primary Citation of Related Structures:  
  3KYL


• PubMed Abstract: 
  

Telomerase is a specialized DNA polymerase that extends the 3' ends of eukaryotic linear chromosomes, a process required for genomic stability and cell viability. Here we present the crystal structure of the active Tribolium castaneum telomerase catalytic subunit, TERT, bound to an RNA-DNA hairpin designed to resemble the putative RNA-templating region and telomeric DNA. The RNA-DNA hybrid adopts a helical structure, docked in the interior cavity of the TERT ring. Contacts between the RNA template and motifs 2 and B' position the solvent-accessible RNA bases close to the enzyme active site for nucleotide binding and selectivity. Nucleic acid binding induces rigid TERT conformational changes to form a tight catalytic complex. Overall, TERT-RNA template and TERT-telomeric DNA associations are remarkably similar to those observed for retroviral reverse transcriptases, suggesting common mechanistic aspects of DNA replication between the two families of enzymes.

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Organizational Affiliation: 

Gene Expression and Regulation Program, The Wistar Institute, Philadelphia, Pennsylvania, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Telomerase reverse transcriptase	A	596	Tribolium castaneum	Mutation(s): 0  Gene Names: TERT, TcasGA2_TC010963 EC: 2.7.7.49
UniProt
Find proteins for Q0QHL8 (Tribolium castaneum) Explore Q0QHL8  Go to UniProtKB:  Q0QHL8

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA/RNA (5'-R(*CP*UP*GP*AP*CP*CP*UP*GP*AP*C)-D(P*TP*TP*CP*GP*GP*TP*CP*AP*GP*GP*TP*CP*AP*G)-3')	B [auth E]	24	N/A

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.287 
• R-Value Work: 0.242 
• R-Value Observed: 0.245 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.231	α = 90
b = 52.782	β = 101.9
c = 101.609	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PHASER	phasing
ELVES	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-03-31 
Deposition Author(s): Skordalakes, E.

Revision History  

• Version 1.0: 2010-03-31
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2012-02-22
  Changes: Database references
• Version 1.3: 2017-11-01
  Changes: Refinement description
• Version 1.4: 2019-07-17
  Changes: Data collection, Refinement description