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- PDB-8fpi: Co-structure of the Respiratory Syncytial Virus RNA-dependent RNA... -

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Basic information

Entry
Database: PDB / ID: 8fpi
TitleCo-structure of the Respiratory Syncytial Virus RNA-dependent RNA polymerase with MRK-1
Components
  • Phosphoprotein
  • RNA-directed RNA polymerase L
KeywordsREPLICATION / RNA-BINDING PROTEIN / RSV / RDRP / RNA-DEPENDENT RNA POLYMERASE / PRNTASE / POLYRIBONUCLEOTIDYL TRANSFERASE / RNA CAPPING / VIRAL REPLICATION / VIRAL PROTEIN
Function / homology
Function and homology information


NNS virus cap methyltransferase / GDP polyribonucleotidyltransferase / negative stranded viral RNA replication / Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides / viral life cycle / virion component / : / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / host cell cytoplasm / RNA-directed RNA polymerase ...NNS virus cap methyltransferase / GDP polyribonucleotidyltransferase / negative stranded viral RNA replication / Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides / viral life cycle / virion component / : / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / host cell cytoplasm / RNA-directed RNA polymerase / RNA-dependent RNA polymerase activity / GTPase activity / ATP binding / metal ion binding
Similarity search - Function
RNA-directed RNA polymerase, paramyxovirus / Phosphoprotein, pneumoviral / Pneumovirus phosphoprotein / RNA-directed RNA polymerase L methyltransferase domain, rhabdovirus / Virus-capping methyltransferase, MT domain / Mononegavirales RNA-directed RNA polymerase catalytic domain / Mononegavirus L protein 2-O-ribose methyltransferase / Mononegavirales mRNA-capping domain V / RNA-directed RNA polymerase L, C-terminal / Mononegavirales RNA dependent RNA polymerase ...RNA-directed RNA polymerase, paramyxovirus / Phosphoprotein, pneumoviral / Pneumovirus phosphoprotein / RNA-directed RNA polymerase L methyltransferase domain, rhabdovirus / Virus-capping methyltransferase, MT domain / Mononegavirales RNA-directed RNA polymerase catalytic domain / Mononegavirus L protein 2-O-ribose methyltransferase / Mononegavirales mRNA-capping domain V / RNA-directed RNA polymerase L, C-terminal / Mononegavirales RNA dependent RNA polymerase / Mononegavirales mRNA-capping region V / RdRp of negative ssRNA viruses with non-segmented genomes catalytic domain profile. / Mononegavirus L protein 2'-O-ribose methyltransferase domain profile.
Similarity search - Domain/homology
Chem-Y6L / Phosphoprotein / RNA-directed RNA polymerase L
Similarity search - Component
Biological speciesHuman respiratory syncytial virus A2
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.52 Å
AuthorsFischmann, T.O.
Funding support United States, 1items
OrganizationGrant numberCountry
Other private United States
CitationJournal: Commun Biol / Year: 2023
Title: Conserved allosteric inhibitory site on the respiratory syncytial virus and human metapneumovirus RNA-dependent RNA polymerases.
Authors: Victoria A Kleiner / Thierry O Fischmann / John A Howe / Douglas C Beshore / Michael J Eddins / Yan Hou / Todd Mayhood / Daniel Klein / Debbie D Nahas / Bob J Lucas / He Xi / Edward Murray / ...Authors: Victoria A Kleiner / Thierry O Fischmann / John A Howe / Douglas C Beshore / Michael J Eddins / Yan Hou / Todd Mayhood / Daniel Klein / Debbie D Nahas / Bob J Lucas / He Xi / Edward Murray / Daphne Y Ma / Krista Getty / Rachel Fearns /
Abstract: Respiratory syncytial virus (RSV) and human metapneumovirus (HMPV) are related RNA viruses responsible for severe respiratory infections and resulting disease in infants, elderly, and ...Respiratory syncytial virus (RSV) and human metapneumovirus (HMPV) are related RNA viruses responsible for severe respiratory infections and resulting disease in infants, elderly, and immunocompromised adults. Therapeutic small molecule inhibitors that bind to the RSV polymerase and inhibit viral replication are being developed, but their binding sites and molecular mechanisms of action remain largely unknown. Here we report a conserved allosteric inhibitory site identified on the L polymerase proteins of RSV and HMPV that can be targeted by a dual-specificity, non-nucleoside inhibitor, termed MRK-1. Cryo-EM structures of the inhibitor in complexes with truncated RSV and full-length HMPV polymerase proteins provide a structural understanding of how MRK-1 is active against both viruses. Functional analyses indicate that MRK-1 inhibits conformational changes necessary for the polymerase to engage in RNA synthesis initiation and to transition into an elongation mode. Competition studies reveal that the MRK-1 binding pocket is distinct from that of a capping inhibitor with an overlapping resistance profile, suggesting that the polymerase conformation bound by MRK-1 may be distinct from that involved in mRNA capping. These findings should facilitate optimization of dual RSV and HMPV replication inhibitors and provide insights into the molecular mechanisms underlying their polymerase activities.
History
DepositionJan 4, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 14, 2023Provider: repository / Type: Initial release
Revision 1.1Jul 5, 2023Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: RNA-directed RNA polymerase L
B: Phosphoprotein
C: Phosphoprotein
D: Phosphoprotein
E: Phosphoprotein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)289,9986
Polymers289,5205
Non-polymers4791
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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


Mass: 173267.922 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human respiratory syncytial virus A2 / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P28887, RNA-directed RNA polymerase, Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides, GDP polyribonucleotidyltransferase, NNS virus cap methyltransferase
#2: Protein
Phosphoprotein / / Protein P


Mass: 29062.895 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human respiratory syncytial virus A2 / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P03421
#3: Chemical ChemComp-Y6L / 4-(2-aminopropan-2-yl)-N'-[4-(cyclopropyloxy)-3-methoxybenzoyl]-6-(4-fluorophenyl)pyridine-2-carbohydrazide


Mass: 478.515 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C26H27FN4O4 / 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: RESPIRATORY SYNCYTIAL VIRUS POLYMERASE (L) PROTEIN BOUND BY THE TETRAMERIC PHOSPHOPROTEIN (P) AND COMPLEXED WITH MRK-1
Type: COMPLEX / Entity ID: #2 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Human orthopneumovirus
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
SpecimenConc.: 0.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen 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 FIELDBright-field microscopy / Nominal defocus max: 2200 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 34.5 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.52 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 589457 / Num. of class averages: 13 / Symmetry type: POINT
Atomic model buildingSpace: REAL
RefinementHighest resolution: 2.39 Å

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