8OUF

The H/ACA RNP lobe of human telomerase with the dyskerin thumb loop in an open conformation


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

2.7 angstrom cryo-EM structure of human telomerase H/ACA ribonucleoprotein.

Ghanim, G.E.Sekne, Z.Balch, S.van Roon, A.M.Nguyen, T.H.D.

(2024) Nat Commun 15: 746-746

  • DOI: https://doi.org/10.1038/s41467-024-45002-x
  • Primary Citation of Related Structures:  
    8OUE, 8OUF

  • PubMed Abstract: 

    Telomerase is a ribonucleoprotein (RNP) enzyme that extends telomeric repeats at eukaryotic chromosome ends to counterbalance telomere loss caused by incomplete genome replication. Human telomerase is comprised of two distinct functional lobes tethered by telomerase RNA (hTR): a catalytic core, responsible for DNA extension; and a Hinge and ACA (H/ACA) box RNP, responsible for telomerase biogenesis. H/ACA RNPs also have a general role in pseudouridylation of spliceosomal and ribosomal RNAs, which is critical for the biogenesis of the spliceosome and ribosome. Much of our structural understanding of eukaryotic H/ACA RNPs comes from structures of the human telomerase H/ACA RNP. Here we report a 2.7 Å cryo-electron microscopy structure of the telomerase H/ACA RNP. The significant improvement in resolution over previous 3.3 Å to 8.2 Å structures allows us to uncover new molecular interactions within the H/ACA RNP. Many disease mutations are mapped to these interaction sites. The structure also reveals unprecedented insights into a region critical for pseudouridylation in canonical H/ACA RNPs. Together, our work advances understanding of telomerase-related disease mutations and the mechanism of pseudouridylation by eukaryotic H/ACA RNPs.


  • Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK.


Macromolecules

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
H/ACA ribonucleoprotein complex subunit DKC1B [auth C],
F [auth G]
514Homo sapiensMutation(s): 0 
EC: 5.4.99
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PHAROS:  O60832
GTEx:  ENSG00000130826 
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UniProt GroupO60832
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
H/ACA ribonucleoprotein complex subunit 1C [auth D],
G [auth H]
217Homo sapiensMutation(s): 0 
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Find proteins for Q9NY12 (Homo sapiens)
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PHAROS:  Q9NY12
GTEx:  ENSG00000109534 
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UniProt GroupQ9NY12
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
H/ACA ribonucleoprotein complex subunit 2D [auth E],
H [auth I]
153Homo sapiensMutation(s): 0 
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PHAROS:  Q9NX24
GTEx:  ENSG00000145912 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
H/ACA ribonucleoprotein complex subunit 3E [auth F],
I [auth J]
64Homo sapiensMutation(s): 0 
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Find proteins for Q9NPE3 (Homo sapiens)
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PHAROS:  Q9NPE3
GTEx:  ENSG00000182117 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Telomerase Cajal body protein 1J [auth K]548Homo sapiensMutation(s): 0 
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PHAROS:  Q9BUR4
GTEx:  ENSG00000141499 
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Entity ID: 1
MoleculeChains LengthOrganismImage
Human telomerase RNAA [auth B]451Homo sapiens
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION4
MODEL REFINEMENTREFMAC5.8
MODEL REFINEMENTPHENIX1.20-4459

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
UK Research and Innovation (UKRI)United KingdomMC_UP_1201/19
Jane Coffin Childs (JCC) FundUnited States--
European Molecular Biology Organization (EMBO)European Union--

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-31
    Type: Initial release
  • Version 1.1: 2024-02-07
    Changes: Database references