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- PDB-8dan: CryoEM structure of Western equine encephalitis virus VLP in comp... -

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Basic information

Entry
Database: PDB / ID: 8dan
TitleCryoEM structure of Western equine encephalitis virus VLP in complex with the avian MXRA8 receptor
Components
  • E1 envelope glycoprotein
  • E2 envelope glycoprotein
  • Matrix remodeling-associated protein 8
KeywordsVIRUS LIKE PARTICLE / WEEV / MXRA8 / Receptor / Alphavirus / Avian / VLP / Structural Genomics / PSI-2 / Protein Structure Initiative / Center for Structural Genomics of Infectious Diseases / CSGID
Function / homology
Function and homology information


T=4 icosahedral viral capsid / host cell cytoplasm / cell differentiation / cell adhesion / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / symbiont entry into host cell / virion attachment to host cell / host cell plasma membrane / virion membrane ...T=4 icosahedral viral capsid / host cell cytoplasm / cell differentiation / cell adhesion / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / symbiont entry into host cell / virion attachment to host cell / host cell plasma membrane / virion membrane / structural molecule activity / cell surface / proteolysis / membrane / plasma membrane
Similarity search - Function
Matrix remodeling-associated protein 8 / Alphavirus E2 glycoprotein, domain B / Peptidase S3, togavirin / Alphavirus E2 glycoprotein / Alphavirus E3 spike glycoprotein / Alphavirus E1 glycoprotein / Alphavirus E2 glycoprotein, domain A / Alphavirus E2 glycoprotein, domain C / Alphavirus E2 glycoprotein / Alphavirus core protein ...Matrix remodeling-associated protein 8 / Alphavirus E2 glycoprotein, domain B / Peptidase S3, togavirin / Alphavirus E2 glycoprotein / Alphavirus E3 spike glycoprotein / Alphavirus E1 glycoprotein / Alphavirus E2 glycoprotein, domain A / Alphavirus E2 glycoprotein, domain C / Alphavirus E2 glycoprotein / Alphavirus core protein / Alphavirus E3 glycoprotein / Alphavirus E1 glycoprotein / Alphavirus core protein (CP) domain profile. / Flavivirus/Alphavirus glycoprotein, immunoglobulin-like domain superfamily / Flavivirus glycoprotein, central and dimerisation domain superfamily / Flaviviral glycoprotein E, dimerisation domain / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Immunoglobulin subtype / Immunoglobulin / Immunoglobulin E-set / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
Matrix remodeling-associated protein 8 / Structural polyprotein
Similarity search - Component
Biological speciesWestern equine encephalitis virus
Asarcornis scutulata (bird)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.74 Å
AuthorsZimmerman, M.I. / Fremont, D.H. / Center for Structural Genomics of Infectious Diseases (CSGID) / Center for Structural Biology of Infectious Diseases (CSBID)
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)HHSN272201700060C United States
CitationJournal: Cell / Year: 2023
Title: Vertebrate-class-specific binding modes of the alphavirus receptor MXRA8.
Authors: Ofer Zimmerman / Maxwell I Zimmerman / Saravanan Raju / Christopher A Nelson / John M Errico / Emily A Madden / Autumn C Holmes / Ahmed O Hassan / Laura A VanBlargan / Arthur S Kim / Lucas J ...Authors: Ofer Zimmerman / Maxwell I Zimmerman / Saravanan Raju / Christopher A Nelson / John M Errico / Emily A Madden / Autumn C Holmes / Ahmed O Hassan / Laura A VanBlargan / Arthur S Kim / Lucas J Adams / Katherine Basore / Bradley M Whitener / Sathvik Palakurty / Hannah G Davis-Adams / Chengqun Sun / Theron Gilliland / James T Earnest / Hongming Ma / Gregory D Ebel / Christian Zmasek / Richard H Scheuermann / William B Klimstra / Daved H Fremont / Michael S Diamond /
Abstract: MXRA8 is a receptor for chikungunya (CHIKV) and other arthritogenic alphaviruses with mammalian hosts. However, mammalian MXRA8 does not bind to alphaviruses that infect humans and have avian ...MXRA8 is a receptor for chikungunya (CHIKV) and other arthritogenic alphaviruses with mammalian hosts. However, mammalian MXRA8 does not bind to alphaviruses that infect humans and have avian reservoirs. Here, we show that avian, but not mammalian, MXRA8 can act as a receptor for Sindbis, western equine encephalitis (WEEV), and related alphaviruses with avian reservoirs. Structural analysis of duck MXRA8 complexed with WEEV reveals an inverted binding mode compared with mammalian MXRA8 bound to CHIKV. Whereas both domains of mammalian MXRA8 bind CHIKV E1 and E2, only domain 1 of avian MXRA8 engages WEEV E1, and no appreciable contacts are made with WEEV E2. Using these results, we generated a chimeric avian-mammalian MXRA8 decoy-receptor that neutralizes infection of multiple alphaviruses from distinct antigenic groups in vitro and in vivo. Thus, different alphaviruses can bind MXRA8 encoded by different vertebrate classes with distinct engagement modes, which enables development of broad-spectrum inhibitors.
History
DepositionJun 13, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 20, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.2Sep 24, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.journal_abbrev / _citation.journal_id_CSD ..._citation.journal_abbrev / _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

Downloads & links

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Assembly

Deposited unit
A: E1 envelope glycoprotein
B: E2 envelope glycoprotein
C: Matrix remodeling-associated protein 8
D: E1 envelope glycoprotein
E: E2 envelope glycoprotein
F: Matrix remodeling-associated protein 8
G: E1 envelope glycoprotein
H: E2 envelope glycoprotein
I: Matrix remodeling-associated protein 8
J: E1 envelope glycoprotein
K: E2 envelope glycoprotein
L: Matrix remodeling-associated protein 8
hetero molecules


Theoretical massNumber of molelcules
Total (without water)498,55724
Polymers495,90212
Non-polymers2,65412
Water00
1


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

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Components

#1: Protein
E1 envelope glycoprotein / p130 / Structural polyprotein


Mass: 47188.562 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Western equine encephalitis virus / Production host: Homo sapiens (human) / References: UniProt: Q1W679
#2: Protein
E2 envelope glycoprotein / p130 / Structural polyprotein


Mass: 46171.617 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Western equine encephalitis virus / Production host: Homo sapiens (human) / References: UniProt: Q1W679
#3: Protein
Matrix remodeling-associated protein 8


Mass: 30615.361 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Asarcornis scutulata (bird) / Gene: Mxra8, ASASCU_R01628 / Production host: Homo sapiens (human) / References: UniProt: A0A7K7KW08
#4: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
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: Western equine encephalitis virus VLP in complex with avian MXRA8 receptor
Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightValue: 495 kDa/nm / Experimental value: NO
Source (natural)Organism: Western equine encephalitis virus
Source (recombinant)Organism: Homo sapiens (human)
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

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2200 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 1.03 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 4.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 250347 / Symmetry type: POINT

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