6USP

Telomerase Reverse Transcriptase product complex, TERT:DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.56 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.263 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Mechanisms of nucleotide selection by telomerase.

Schaich, M.A., Sanford, S.L., Welfer, G.A., Johnson, S.A., Khoang, T.H., Opresko, P.L., Freudenthal, B.D.

(2020) Elife 9

  • DOI: 10.7554/eLife.55438
  • Primary Citation of Related Structures:  
    6USO, 6USP, 6USQ, 6USR

  • PubMed Abstract: 

    • Telomerase extends telomere sequences at chromosomal ends to protect genomic DNA. During this process it must select the correct nucleotide from a pool of nucleotides with various sugars and base pairing properties, which is critically important for the proper capping of telomeric sequences by shelterin ...

    Telomerase extends telomere sequences at chromosomal ends to protect genomic DNA. During this process it must select the correct nucleotide from a pool of nucleotides with various sugars and base pairing properties, which is critically important for the proper capping of telomeric sequences by shelterin. Unfortunately, how telomerase selects correct nucleotides is unknown. Here, we determined structures of Tribolium castaneum telomerase reverse transcriptase (TERT) throughout its catalytic cycle and mapped the active site residues responsible for nucleoside selection, metal coordination, triphosphate binding, and RNA template stabilization. We found that TERT inserts a mismatch or ribonucleotide ~1 in 10,000 and ~1 in 14,000 insertion events, respectively. At biological ribonucleotide concentrations, these rates translate to ~40 ribonucleotides inserted per 10 kilobases. Human telomerase assays determined a conserved tyrosine steric gate regulates ribonucleotide insertion into telomeres. Cumulatively, our work provides insight into how telomerase selects the proper nucleotide to maintain telomere integrity.

    Organizational Affiliation: 

    Department of Cancer Biology, University of Kansas Medical Center, Kansas City, United States.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase reverse transcriptaseA597Tribolium castaneumMutation(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 Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ0QHL8
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*GP*GP*TP*CP*AP*GP*GP*TP*CP*AP*GP*GP*TP*CP*AP*G)-3')B [auth E]16synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA/RNA (5'-R(*CP*UP*GP*AP*CP*CP*UP*GP*AP*C)-D(P*CP*T)-R(P*GP*AP*C)-D(P*C)-3')C [auth F]16synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG
Download Ideal Coordinates CCD File 
D [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.56 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.263 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.378α = 90
b = 100.378β = 90
c = 167.999γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
Blu-Icedata collection
XDSdata scaling
PHENIXphasing
XDSdata processing
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35-GM128562

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-17
    Type: Initial release
  • Version 1.1: 2021-01-06
    Changes: Database references, Derived calculations