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- PDB-9n36: CryoEM structure Of Respiratory Syncytial Virus Polymerase with n... -

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Basic information

Entry
Database: PDB / ID: 9n36
TitleCryoEM structure Of Respiratory Syncytial Virus Polymerase with novel non-nucleoside inhibitor compound 22
Components
  • Phosphoprotein
  • RNA-directed RNA polymerase L
KeywordsTRANSFERASE/INHIBITOR / Non-Nucleoside Inhibitor / complex / Polymerase / RSV / VIRAL PROTEIN / TRANSFERASE-INHIBITOR complex
Function / homology
Function and homology information


Respiratory syncytial virus genome transcription / NNS virus cap methyltransferase / Translation of respiratory syncytial virus mRNAs / GDP polyribonucleotidyltransferase / negative stranded viral RNA replication / Respiratory syncytial virus genome replication / RSV-host interactions / Maturation of hRSV A proteins / Assembly and release of respiratory syncytial virus (RSV) virions / Respiratory syncytial virus (RSV) attachment and entry ...Respiratory syncytial virus genome transcription / NNS virus cap methyltransferase / Translation of respiratory syncytial virus mRNAs / GDP polyribonucleotidyltransferase / negative stranded viral RNA replication / Respiratory syncytial virus genome replication / RSV-host interactions / Maturation of hRSV A proteins / Assembly and release of respiratory syncytial virus (RSV) virions / Respiratory syncytial virus (RSV) attachment and entry / Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides / viral life cycle / virion component / symbiont-mediated suppression of host NF-kappaB cascade / host cell cytoplasm / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA-directed RNA polymerase / RNA-directed RNA polymerase activity / GTPase activity / ATP binding / metal ion binding
Similarity search - Function
Phosphoprotein, pneumoviral / Pneumovirus phosphoprotein / RNA-directed RNA polymerase L methyltransferase domain, rhabdovirus / Virus-capping methyltransferase, MT domain / RNA-directed RNA polymerase, paramyxovirus / Mononegavirus L protein 2-O-ribose methyltransferase / RNA-directed RNA polymerase L, C-terminal / Mononegavirus L protein 2'-O-ribose methyltransferase domain profile. / Mononegavirales RNA-directed RNA polymerase catalytic domain / Mononegavirales mRNA-capping domain V ...Phosphoprotein, pneumoviral / Pneumovirus phosphoprotein / RNA-directed RNA polymerase L methyltransferase domain, rhabdovirus / Virus-capping methyltransferase, MT domain / RNA-directed RNA polymerase, paramyxovirus / Mononegavirus L protein 2-O-ribose methyltransferase / RNA-directed RNA polymerase L, C-terminal / Mononegavirus L protein 2'-O-ribose methyltransferase domain profile. / Mononegavirales RNA-directed RNA polymerase catalytic domain / Mononegavirales mRNA-capping domain V / Mononegavirales RNA dependent RNA polymerase / Mononegavirales mRNA-capping region V / RdRp of negative ssRNA viruses with non-segmented genomes catalytic domain profile.
Similarity search - Domain/homology
: / Phosphoprotein / RNA-directed RNA polymerase L
Similarity search - Component
Biological specieshuman respiratory syncytial virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.72 Å
AuthorsYin, Y. / Yu, X. / Kalin, J.H. / Tran, M.T. / Sharma, S.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: J Virol / Year: 2025
Title: Discovery of a non-nucleoside inhibitor that binds to a novel site in the palm domain of the respiratory syncytial virus RNA-dependent RNA polymerase.
Authors: Jay H Kalin / Yanting Yin / Minh T Tran / Madison Piassek / Amy Fung / Sandrine Grosse / Edgar Jacoby / Anusarka Bhaumik / Suraj Adhikary / Robyn Miller / Cynthia Lemmens / Ferdinand H ...Authors: Jay H Kalin / Yanting Yin / Minh T Tran / Madison Piassek / Amy Fung / Sandrine Grosse / Edgar Jacoby / Anusarka Bhaumik / Suraj Adhikary / Robyn Miller / Cynthia Lemmens / Ferdinand H Lutter / Serge Pieters / Ludwig Cooymans / Geert Rombouts / Daniel Oehlrich / Sonia Tomaso / Kate Lozada / Miguel Osorio Garcia / Brandon Anson / Suzanne De Bruyn / Constance Smith-Monroy / Jean-Marc Neefs / Nádia Conceição-Neto / Bart Stoops / Herman van Vlijmen / Aaron Patrick / Xiaodi Yu / Victoria Wong / Daniel Krosky / Pravien Abeywickrema / Stephen Mason / Zhinan Jin / Tim H M Jonckers / Sujata Sharma /
Abstract: Respiratory syncytial virus (RSV) is a major cause of severe respiratory tract infections in infants, young children, and the elderly. We report herein the discovery and characterization of a novel ...Respiratory syncytial virus (RSV) is a major cause of severe respiratory tract infections in infants, young children, and the elderly. We report herein the discovery and characterization of a novel RSV polymerase (RSVpol) non-nucleoside inhibitor (NNI) chemotype that binds to a previously undescribed, highly conserved site in the palm domain of the L protein. Consistent with the observed mode of inhibition, cryogenic electron microscopy (cryo-EM) revealed the site to be adjacent to the nucleotide binding site. Minireplicon assays confirmed on-target activity against RSVpol, and cell-based antiviral assays showed that the lead compound effectively inhibited viral mRNA transcription and replication in clinically relevant A and B strains. Together, our data provides valuable insights into the molecular basis of inhibition for a novel mechanism of action and paves the way for structure-based design to deliver effective therapeutics against RSV.IMPORTANCERespiratory syncytial virus (RSV) is a negative-sense, single-stranded RNA virus belonging to the family of the order . Currently, monoclonal antibody treatments are only approved for infants, and vaccines are reserved for pregnant women and adults aged 60 years and older. Prophylaxis is also limited to the pediatric patient population, and there are currently no direct antiviral therapies for post-exposure treatment. Viral polymerases are considered well-validated drug targets due to their critical role in transcription and genome replication. Herein, we disclose the discovery of a spiro-indolinone series as polymerase inhibitors and describe the preliminary structure-activity relationship (SAR). A cryogenic electron microscopy (cryo-EM) structure obtained with an optimized lead revealed a novel binding site located in the palm domain, which will enable future structure-based drug design efforts. Novel RSV antivirals could be beneficial both as therapeutics following diagnosis and as a prophylactic in patients less likely to respond to vaccines.
History
DepositionJan 30, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 28, 2025Provider: repository / Type: Initial release
Revision 1.0May 28, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 28, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 28, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 28, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0May 28, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Dec 10, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update

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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)371,0466
Polymers370,6145
Non-polymers4321
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
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: 254482.750 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) human respiratory syncytial virus / 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: 29032.844 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) human respiratory syncytial virus / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P03421
#3: Chemical ChemComp-A1BVR / 5-(5-bromo-1-methyl-2-oxo-1,2-dihydrospiro[indole-3,4'-piperidin]-1'-yl)-3-chloropyridine-2-carbonitrile


Mass: 431.714 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C19H16BrClN4O / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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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: CryoEM map of Respiratory Syncytial Virus Polymerase with Novel Non-Nucleoside Inhibitor compound 22
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: human respiratory syncytial virus
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: DIFFRACTION / Nominal defocus max: 2000 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 1 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.72 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1546578 / Symmetry type: POINT

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