6USO

Telomerase Reverse Transcriptase prenucleotide binary complex, TERT:DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 

Starting Model: experimental
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This is version 1.2 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: https://doi.org/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. 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 Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, United States.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Telomerase reverse transcriptase597Tribolium castaneumMutation(s): 0 
Gene Names: TERTTcasGA2_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
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*GP*GP*TP*CP*AP*GP*GP*TP*CP*AP*GP*GP*TP*CP*A)-3')B [auth E]15synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
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
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.188α = 90
b = 101.188β = 90
c = 169.321γ = 120
Software Package:
Software NamePurpose
Cootmodel building
PHENIXrefinement
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
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description