7LMA

Tetrahymena telomerase T3D2 structure at 3.3 Angstrom


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of telomerase at several steps of telomere repeat synthesis.

He, Y.Wang, Y.Liu, B.Helmling, C.Susac, L.Cheng, R.Zhou, Z.H.Feigon, J.

(2021) Nature 593: 454-459

  • DOI: 10.1038/s41586-021-03529-9
  • Primary Citation of Related Structures:  
    7LMB, 7LMA

  • PubMed Abstract: 
  • Telomerase is unique among the reverse transcriptases in containing a noncoding RNA (known as telomerase RNA (TER)) that includes a short template that is used for the processive synthesis of G-rich telomeric DNA repeats at the 3' ends of most eukaryotic chromosomes 1 ...

    Telomerase is unique among the reverse transcriptases in containing a noncoding RNA (known as telomerase RNA (TER)) that includes a short template that is used for the processive synthesis of G-rich telomeric DNA repeats at the 3' ends of most eukaryotic chromosomes 1 . Telomerase maintains genomic integrity, and its activity or dysregulation are critical determinants of human longevity, stem cell renewal and cancer progression 2,3 . Previous cryo-electron microscopy structures have established the general architecture, protein components and stoichiometries of Tetrahymena and human telomerase, but our understandings of the details of DNA-protein and RNA-protein interactions and of the mechanisms and recruitment involved remain limited 4-6 . Here we report cryo-electron microscopy structures of active Tetrahymena telomerase with telomeric DNA at different steps of nucleotide addition. Interactions between telomerase reverse transcriptase (TERT), TER and DNA reveal the structural basis of the determination of the 5' and 3' template boundaries, handling of the template-DNA duplex and separation of the product strand during nucleotide addition. The structure and binding interface between TERT and telomerase protein p50 (a homologue of human TPP1 7,8 ) define conserved interactions that are required for telomerase activation and recruitment to telomeres. Telomerase La-related protein p65 remodels several regions of TER, bridging the 5' and 3' ends and the conserved pseudoknot to facilitate assembly of the TERT-TER catalytic core.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, USA. feigon@mbi.ucla.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase La-related protein p65A [auth H]542Tetrahymena thermophilaMutation(s): 0 
Find proteins for W7X6T2 (Tetrahymena thermophila (strain SB210))
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Go to UniProtKB:  W7X6T2
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase reverse transcriptaseB [auth A]1117Tetrahymena thermophilaMutation(s): 0 
EC: 2.7.7.49
Find proteins for O77448 (Tetrahymena thermophila (strain SB210))
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Go to UniProtKB:  O77448
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase holoenzyme Teb1 subunitC [auth D]701Tetrahymena thermophilaMutation(s): 0 
Find proteins for D2CVN6 (Tetrahymena thermophila (strain SB210))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase holoenzyme Teb2 subunitD [auth E]269Tetrahymena thermophilaMutation(s): 0 
Find proteins for A0A0U8TRG9 (Tetrahymena thermophila (strain SB210))
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Go to UniProtKB:  A0A0U8TRG9
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase holoenzyme Teb3 subunitE [auth F]121Tetrahymena thermophilaMutation(s): 0 
Find proteins for A0A0U8UFF4 (Tetrahymena thermophila (strain SB210))
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Telomerase associated protein p50F [auth G]422Tetrahymena thermophilaMutation(s): 0 
Find proteins for D2CVN8 (Tetrahymena thermophila (strain SB210))
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  • Reference Sequence
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Entity ID: 7
MoleculeChainsLengthOrganismImage
Telomerase RNAG [auth B]159Tetrahymena thermophila
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Entity ID: 8
MoleculeChainsLengthOrganismImage
telomere DNAH [auth C]30Tetrahymena thermophila
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
I [auth D]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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 StatesR35GM131901
National Science Foundation (NSF, United States)United StatesMCB2016540
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM071940

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-12
    Type: Initial release
  • Version 1.1: 2021-05-26
    Changes: Database references
  • Version 1.2: 2021-06-02
    Changes: Database references