5C9H

Structural Basis of Template Boundary Definition in Tetrahymena Telomerase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.244 

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This is version 1.4 of the entry. See complete history. 


Literature

Structural basis of template-boundary definition in Tetrahymena telomerase.

Jansson, L.I., Akiyama, B.M., Ooms, A., Lu, C., Rubin, S.M., Stone, M.D.

(2015) Nat Struct Mol Biol 22: 883-888

  • DOI: https://doi.org/10.1038/nsmb.3101
  • Primary Citation of Related Structures:  
    5C9H

  • PubMed Abstract: 

    Telomerase is required to maintain repetitive G-rich telomeric DNA sequences at chromosome ends. To do so, the telomerase reverse transcriptase (TERT) subunit reiteratively uses a small region of the integral telomerase RNA (TER) as a template. An essential feature of telomerase catalysis is the strict definition of the template boundary to determine the precise TER nucleotides to be reverse transcribed by TERT. We report the 3-Å crystal structure of the Tetrahymena TERT RNA-binding domain (tTRBD) bound to the template boundary element (TBE) of TER. tTRBD is wedged into the base of the TBE RNA stem-loop, and each of the flanking RNA strands wraps around opposite sides of the protein domain. The structure illustrates how the tTRBD establishes the template boundary by positioning the TBE at the correct distance from the TERT active site to prohibit copying of nontemplate nucleotides.

    • Organizational Affiliation: 

    Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Telomerase reverse transcriptase
A, B
303Tetrahymena thermophilaMutation(s): 0 
Gene Names: TERT
EC: 2.7.7.49
UniProt
Find proteins for O77448 (Tetrahymena thermophila (strain SB210))
Explore O77448 
Go to UniProtKB:  O77448
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO77448
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
RNA (5'-R(P*AP*GP*AP*AP*CP*UP*GP*UP*CP*A)-3')C [auth D],
E		13Tetrahymena thermophila
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
RNA (5'-R(P*UP*CP*AP*UP*UP*CP*AP*GP*UP*UP*CP*U)-3')D [auth C],
F [auth G]		13Tetrahymena thermophila
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.244 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.53α = 90
b = 117.77β = 90
c = 131.18γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

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 StatesR01 GM095850
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesT32GM008646-16

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-12-02
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence, Derived calculations
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description