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- PDB-8uw3: Human LINE-1 retrotransposon ORF2 protein engaged with template R... -

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Basic information

Entry
Database: PDB / ID: 8uw3
TitleHuman LINE-1 retrotransposon ORF2 protein engaged with template RNA in elongation state
Components
  • Complementary DNA
  • LINE-1 retrotransposable element ORF2 protein
  • Template RNA
KeywordsRNA BINDING PROTEIN/RNA/DNA / LINE-1 / retrotransposon / reverse transcriptase / retroelement / RNA BINDING PROTEIN / RNA / RNA BINDING PROTEIN-RNA-DNA complex
Function / homology
Function and homology information


retrotransposition / nucleic acid metabolic process / type II site-specific deoxyribonuclease activity / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / RNA-directed DNA polymerase / RNA-directed DNA polymerase activity / DNA recombination / RNA binding / metal ion binding
Similarity search - Function
Endonuclease/exonuclease/phosphatase / Endonuclease/Exonuclease/phosphatase family / Endonuclease/exonuclease/phosphatase superfamily / Reverse transcriptase (RNA-dependent DNA polymerase) / Reverse transcriptase domain / Reverse transcriptase (RT) catalytic domain profile. / DNA/RNA polymerase superfamily
Similarity search - Domain/homology
THYMIDINE-5'-TRIPHOSPHATE / DNA / DNA (> 10) / RNA / RNA (> 10) / LINE-1 retrotransposable element ORF2 protein
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsThawani, A. / Florez Ariza, A.J. / Collins, K. / Nogales, E.
Funding support United States, 2items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)DP1HL156819 United States
CitationJournal: Nature / Year: 2024
Title: Template and target-site recognition by human LINE-1 in retrotransposition.
Authors: Akanksha Thawani / Alfredo Jose Florez Ariza / Eva Nogales / Kathleen Collins /
Abstract: The long interspersed element-1 (LINE-1, hereafter L1) retrotransposon has generated nearly one-third of the human genome and serves as an active source of genetic diversity and human disease. L1 ...The long interspersed element-1 (LINE-1, hereafter L1) retrotransposon has generated nearly one-third of the human genome and serves as an active source of genetic diversity and human disease. L1 spreads through a mechanism termed target-primed reverse transcription, in which the encoded enzyme (ORF2p) nicks the target DNA to prime reverse transcription of its own or non-self RNAs. Here we purified full-length L1 ORF2p and biochemically reconstituted robust target-primed reverse transcription with template RNA and target-site DNA. We report cryo-electron microscopy structures of the complete human L1 ORF2p bound to structured template RNAs and initiating cDNA synthesis. The template polyadenosine tract is recognized in a sequence-specific manner by five distinct domains. Among them, an RNA-binding domain bends the template backbone to allow engagement of an RNA hairpin stem with the L1 ORF2p C-terminal segment. Moreover, structure and biochemical reconstitutions demonstrate an unexpected target-site requirement: L1 ORF2p relies on upstream single-stranded DNA to position the adjacent duplex in the endonuclease active site for nicking of the longer DNA strand, with a single nick generating a staggered DNA break. Our research provides insights into the mechanism of ongoing transposition in the human genome and informs the engineering of retrotransposon proteins for gene therapy.
History
DepositionNov 6, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 20, 2023Provider: repository / Type: Initial release
Revision 1.1Dec 27, 2023Group: Database references / Category: citation / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Feb 14, 2024Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: LINE-1 retrotransposable element ORF2 protein
B: Template RNA
C: Complementary DNA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)177,6914
Polymers177,2083
Non-polymers4821
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein LINE-1 retrotransposable element ORF2 protein


Mass: 149300.391 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: O00370
#2: RNA chain Template RNA


Mass: 23956.451 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#3: DNA chain Complementary DNA /


Mass: 3951.586 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#4: Chemical ChemComp-TTP / THYMIDINE-5'-TRIPHOSPHATE / Thymidine triphosphate


Mass: 482.168 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H17N2O14P3 / Feature type: SUBJECT OF INVESTIGATION
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: Human LINE-1 retrotransposon ORF2 protein in elongation stage
Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightValue: 0.175 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenConc.: 0.1 mg/ml / Embedding 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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 105000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 2 / Num. of real images: 23878
Image scansWidth: 11520 / Height: 8184

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Processing

EM softwareName: RELION / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 111564 / Symmetry type: POINT

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