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- PDB-8gap: Structure of LARP7 protein p65-telomerase RNA complex in telomerase -

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Basic information

Entry
Database: PDB / ID: 8gap
TitleStructure of LARP7 protein p65-telomerase RNA complex in telomerase
Components
  • (Telomerase holoenzyme ...) x 3
  • Telomerase La-related protein p65
  • Telomerase RNA
  • Telomerase associated protein p50
  • Telomerase reverse transcriptase
  • telomere DNA
KeywordsRNA BINDING PROTEIN / La protein / La-related protein / telomerase / ribonucleoprotein
Function / homology
Function and homology information


telomerase catalytic core complex assembly / telomerase RNA stabilization / telomerase catalytic core complex / : / DNA replication factor A complex / single-stranded telomeric DNA binding / telomerase holoenzyme complex / telomerase RNA binding / telomeric DNA binding / telomere maintenance via telomerase ...telomerase catalytic core complex assembly / telomerase RNA stabilization / telomerase catalytic core complex / : / DNA replication factor A complex / single-stranded telomeric DNA binding / telomerase holoenzyme complex / telomerase RNA binding / telomeric DNA binding / telomere maintenance via telomerase / RNA-directed DNA polymerase / DNA recombination / DNA replication / chromosome, telomeric region / DNA repair / DNA binding / zinc ion binding / metal ion binding
Similarity search - Function
: / Telomerase reverse transcriptase TEN domain / Replication factor A protein 3 / Replication factor A protein 3 / xRRM domain profile. / La protein, xRRM domain / La domain containing protein / La domain / Domain in the RNA-binding Lupus La protein; unknown function / La-type HTH domain ...: / Telomerase reverse transcriptase TEN domain / Replication factor A protein 3 / Replication factor A protein 3 / xRRM domain profile. / La protein, xRRM domain / La domain containing protein / La domain / Domain in the RNA-binding Lupus La protein; unknown function / La-type HTH domain / La-type HTH domain profile. / Telomerase ribonucleoprotein complex - RNA binding domain / : / Telomerase reverse transcriptase / Telomerase ribonucleoprotein complex - RNA-binding domain / Telomerase ribonucleoprotein complex - RNA binding domain / Replication factor A, C-terminal / Replication factor-A C terminal domain / RNA recognition motif / RNA recognition motif / Eukaryotic RNA Recognition Motif (RRM) profile. / RNA recognition motif domain / RNA-binding domain superfamily / Reverse transcriptase (RNA-dependent DNA polymerase) / Reverse transcriptase domain / Reverse transcriptase (RT) catalytic domain profile. / Winged helix DNA-binding domain superfamily / Nucleotide-binding alpha-beta plait domain superfamily / Winged helix-like DNA-binding domain superfamily / Nucleic acid-binding, OB-fold
Similarity search - Domain/homology
: / DNA / DNA (> 10) / RNA / RNA (> 10) / RNA (> 100) / Replication protein A 32 kDa subunit / Replication protein A 14 kDa subunit / Telomeric repeat-binding subunit 1 / Telomerase-associated protein of 50 kDa ...: / DNA / DNA (> 10) / RNA / RNA (> 10) / RNA (> 100) / Replication protein A 32 kDa subunit / Replication protein A 14 kDa subunit / Telomeric repeat-binding subunit 1 / Telomerase-associated protein of 50 kDa / Telomerase reverse transcriptase / La-related protein 7 homolog
Similarity search - Component
Biological speciesTetrahymena thermophila (eukaryote)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsWang, Y. / He, Y. / Wang, Y. / Yang, Y. / Singh, M. / Eichhorn, C.D. / Zhou, Z.H. / Feigon, J.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM131901 United States
National Science Foundation (NSF, United States)MCB2016540 United States
CitationJournal: J Mol Biol / Year: 2023
Title: Structure of LARP7 Protein p65-telomerase RNA Complex in Telomerase Revealed by Cryo-EM and NMR.
Authors: Yaqiang Wang / Yao He / Yanjiao Wang / Yuan Yang / Mahavir Singh / Catherine D Eichhorn / Xinyi Cheng / Yi Xiao Jiang / Z Hong Zhou / Juli Feigon /
Abstract: La-related protein 7 (LARP7) are a family of RNA chaperones that protect the 3'-end of RNA and are components of specific ribonucleoprotein complexes (RNP). In Tetrahymena thermophila telomerase, ...La-related protein 7 (LARP7) are a family of RNA chaperones that protect the 3'-end of RNA and are components of specific ribonucleoprotein complexes (RNP). In Tetrahymena thermophila telomerase, LARP7 protein p65 together with telomerase reverse transcriptase (TERT) and telomerase RNA (TER) form the core RNP. p65 has four known domains-N-terminal domain (NTD), La motif (LaM), RNA recognition motif 1 (RRM1), and C-terminal xRRM2. To date, only the xRRM2 and LaM and their interactions with TER have been structurally characterized. Conformational dynamics leading to low resolution in cryo-EM density maps have limited our understanding of how full-length p65 specifically recognizes and remodels TER for telomerase assembly. Here, we combined focused classification of Tetrahymena telomerase cryo-EM maps with NMR spectroscopy to determine the structure of p65-TER. Three previously unknown helices are identified, one in the otherwise intrinsically disordered NTD that binds the La module, one that extends RRM1, and another preceding xRRM2, that stabilize p65-TER interactions. The extended La module (αN, LaM and RRM1) interacts with the four 3' terminal U nucleotides, while LaM and αN additionally interact with TER pseudoknot, and LaM with stem 1 and 5' end. Our results reveal the extensive p65-TER interactions that promote TER 3'-end protection, TER folding, and core RNP assembly and stabilization. The structure of full-length p65 with TER also sheds light on the biological roles of genuine La and LARP7 proteins as RNA chaperones and core RNP components.
History
DepositionFeb 23, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 28, 2023Provider: repository / Type: Initial release
Revision 1.1Jul 19, 2023Group: Database references / Category: citation / citation_author / Item: _citation.journal_volume / _citation_author.name
Revision 1.2Jun 19, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Telomerase reverse transcriptase
D: Telomerase holoenzyme Teb1 subunit
E: Telomerase holoenzyme Teb2 subunit
F: Telomerase holoenzyme Teb3 subunit
G: Telomerase associated protein p50
C: telomere DNA
B: Telomerase RNA
H: Telomerase La-related protein p65
hetero molecules


Theoretical massNumber of molelcules
Total (without water)435,1789
Polymers435,1138
Non-polymers651
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 3 types, 3 molecules AGH

#1: Protein Telomerase reverse transcriptase / Telomerase catalytic subunit / Telomerase subunit P133


Mass: 133486.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: UniProt: O77448, RNA-directed DNA polymerase
#5: Protein Telomerase associated protein p50 / p50


Mass: 50049.688 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: UniProt: D2CVN8
#8: Protein Telomerase La-related protein p65 / Telomerase-associated protein of 65 kDa / p65


Mass: 64207.363 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: UniProt: W7X6T2

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Telomerase holoenzyme ... , 3 types, 3 molecules DEF

#2: Protein Telomerase holoenzyme Teb1 subunit


Mass: 82040.289 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: UniProt: D2CVN6
#3: Protein Telomerase holoenzyme Teb2 subunit


Mass: 30993.035 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: UniProt: A0A0U8TRG9
#4: Protein Telomerase holoenzyme Teb3 subunit


Mass: 14007.626 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: UniProt: A0A0U8UFF4

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DNA chain / RNA chain / Non-polymers , 3 types, 3 molecules CB

#6: DNA chain telomere DNA


Mass: 9581.087 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#7: RNA chain Telomerase RNA


Mass: 50746.984 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Tetrahymena thermophila (eukaryote) / References: GenBank: 15148878
#9: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: tetrahymena telomerase holoenzyme / Type: COMPLEX / Entity ID: #1-#8 / Source: NATURAL
Source (natural)Organism: Tetrahymena thermophila (eukaryote)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 4000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 48 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 162358 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00221294
ELECTRON MICROSCOPYf_angle_d0.54529462
ELECTRON MICROSCOPYf_dihedral_angle_d16.6654215
ELECTRON MICROSCOPYf_chiral_restr0.0383371
ELECTRON MICROSCOPYf_plane_restr0.0033128

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