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- PDB-7oe3: Apo-structure of Lassa virus L protein (well-resolved endonucleas... -

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Basic information

Entry
Database: PDB / ID: 7oe3
TitleApo-structure of Lassa virus L protein (well-resolved endonuclease) [APO-ENDO]
ComponentsRNA-directed RNA polymerase L
KeywordsVIRAL PROTEIN / Lassa virus RNA-dependent RNA polymerase viral RNA
Function / homology
Function and homology information


negative stranded viral RNA replication / cap snatching / virion component / host cell / Hydrolases; Acting on ester bonds / host cell cytoplasm / hydrolase activity / RNA-directed RNA polymerase / nucleotide binding / RNA-directed RNA polymerase activity / metal ion binding
Similarity search - Function
RNA polymerase, arenaviral / RNA endonuclease, cap-snatching / Arenavirus RNA polymerase / Arenavirus cap snatching domain / : / RNA-directed RNA polymerase, negative-strand RNA virus / RdRp of negative ssRNA viruses with segmented genomes catalytic domain profile.
Similarity search - Domain/homology
RNA-directed RNA polymerase L
Similarity search - Component
Biological speciesLassa mammarenavirus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.35 Å
AuthorsKouba, T. / Vogel, D. / Thorkelsson, S. / Quemin, E. / Williams, H.M. / Milewski, M. / Busch, C. / Gunther, S. / Grunewald, K. / Rosenthal, M. / Cusack, S.
Funding support Germany, 2items
OrganizationGrant numberCountry
Leibniz AssociationK27/2017 Germany
Leibniz Association152/777-1 FUGG Germany
CitationJournal: Nat Commun / Year: 2021
Title: Conformational changes in Lassa virus L protein associated with promoter binding and RNA synthesis activity.
Authors: Tomas Kouba / Dominik Vogel / Sigurdur R Thorkelsson / Emmanuelle R J Quemin / Harry M Williams / Morlin Milewski / Carola Busch / Stephan Günther / Kay Grünewald / Maria Rosenthal / Stephen Cusack /
Abstract: Lassa virus is endemic in West Africa and can cause severe hemorrhagic fever. The viral L protein transcribes and replicates the RNA genome via its RNA-dependent RNA polymerase activity. Here, we ...Lassa virus is endemic in West Africa and can cause severe hemorrhagic fever. The viral L protein transcribes and replicates the RNA genome via its RNA-dependent RNA polymerase activity. Here, we present nine cryo-EM structures of the L protein in the apo-, promoter-bound pre-initiation and active RNA synthesis states. We characterize distinct binding pockets for the conserved 3' and 5' promoter RNAs and show how full-promoter binding induces a distinct pre-initiation conformation. In the apo- and early elongation states, the endonuclease is inhibited by two distinct L protein peptides, whereas in the pre-initiation state it is uninhibited. In the early elongation state, a template-product duplex is bound in the active site cavity together with an incoming non-hydrolysable nucleotide and the full C-terminal region of the L protein, including the putative cap-binding domain, is well-ordered. These data advance our mechanistic understanding of how this flexible and multifunctional molecular machine is activated.
History
DepositionMay 1, 2021Deposition site: PDBE / Processing site: PDBE
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Assembly

Deposited unit
L: RNA-directed RNA polymerase L
hetero molecules


Theoretical massNumber of molelcules
Total (without water)253,7473
Polymers253,6571
Non-polymers902
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: native gel electrophoresis
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area100 Å2
ΔGint-10 kcal/mol
Surface area74250 Å2
MethodPISA

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Components

#1: Protein RNA-directed RNA polymerase L / Protein L / Large structural protein / Replicase / Transcriptase


Mass: 253656.938 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Lassa mammarenavirus / Production host: Trichoplusia ni (cabbage looper)
References: UniProt: A0A3S8NV63, RNA-directed RNA polymerase, Hydrolases; Acting on ester bonds
#2: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#3: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
Has ligand of interestN
Has protein modificationY

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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: RNA-directed RNA polymerase L Lassa mammarenavirus / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.253346 MDa / Experimental value: NO
Source (natural)Organism: Lassa mammarenavirus
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
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
Image recordingElectron dose: 49.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.35 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 74000 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00212133
ELECTRON MICROSCOPYf_angle_d0.45716372
ELECTRON MICROSCOPYf_dihedral_angle_d6.0591595
ELECTRON MICROSCOPYf_chiral_restr0.0381854
ELECTRON MICROSCOPYf_plane_restr0.0032075

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