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, 6USQ, 6USP, 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

Find similar proteins by: 
(by identity cutoff)  |  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
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • 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
    • Find similar nucleic acids by:  Sequence   |   Structure
      • 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

      View Full Validation Report


      View more in-depth experimental data

      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