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- EMDB-20019: EEEV glycoproteins bound with heparan sulfate -

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Basic information

Entry
Database: EMDB / ID: EMD-20019
TitleEEEV glycoproteins bound with heparan sulfate
Map dataEEEV-Hp
SampleEEEV glycoproteins bound with heparan != Eastern equine encephalitis virus

EEEV glycoproteins bound with heparan

  • Virus: Eastern equine encephalitis virus
    • Protein or peptide: E1
    • Protein or peptide: E2
Function / homology
Function and homology information


togavirin / T=4 icosahedral viral capsid / symbiont-mediated suppression of host toll-like receptor signaling pathway / host cell cytoplasm / symbiont entry into host cell / symbiont-mediated suppression of host gene expression / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / host cell nucleus / virion attachment to host cell ...togavirin / T=4 icosahedral viral capsid / symbiont-mediated suppression of host toll-like receptor signaling pathway / host cell cytoplasm / symbiont entry into host cell / symbiont-mediated suppression of host gene expression / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / host cell nucleus / virion attachment to host cell / host cell plasma membrane / virion membrane / structural molecule activity / proteolysis / RNA binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
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 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 E-set / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
Structural polyprotein / Structural polyprotein / Structural polyprotein
Similarity search - Component
Biological speciesEastern equine encephalitis virus
Methodsingle particle reconstruction / cryo EM / Resolution: 5.8 Å
AuthorsRossmann MG / Chen CL
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)R01AI095366 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2020
Title: Cryo-EM structure of eastern equine encephalitis virus in complex with heparan sulfate analogues.
Authors: Chun-Liang Chen / S Saif Hasan / Thomas Klose / Yingyuan Sun / Geeta Buda / Chengqun Sun / William B Klimstra / Michael G Rossmann /
Abstract: Eastern equine encephalitis virus (EEEV), a mosquito-borne icosahedral alphavirus found mainly in North America, causes human and equine neurotropic infections. EEEV neurovirulence is influenced by ...Eastern equine encephalitis virus (EEEV), a mosquito-borne icosahedral alphavirus found mainly in North America, causes human and equine neurotropic infections. EEEV neurovirulence is influenced by the interaction of the viral envelope protein E2 with heparan sulfate (HS) proteoglycans from the host's plasma membrane during virus entry. Here, we present a 5.8-Å cryoelectron microscopy (cryo-EM) structure of EEEV complexed with the HS analog heparin. "Peripheral" HS binding sites were found to be associated with the base of each of the E2 glycoproteins that form the 60 quasi-threefold spikes (q3) and the 20 sites associated with the icosahedral threefold axes (i3). In addition, there is one HS site at the vertex of each q3 and i3 spike (the "axial" sites). Both the axial and peripheral sites are surrounded by basic residues, suggesting an electrostatic mechanism for HS binding. These residues are highly conserved among EEEV strains, and therefore a change in these residues might be linked to EEEV neurovirulence.
History
DepositionMar 26, 2019-
Header (metadata) releaseApr 3, 2019-
Map releaseApr 1, 2020-
UpdateJul 29, 2020-
Current statusJul 29, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 1
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  • Surface view colored by radius
  • Surface level: 1
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  • Surface view with fitted model
  • Atomic models: PDB-6odf
  • Surface level: 1
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6odf
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Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20019.png

Downloads & links

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Map

FileDownload / File: emd_20019.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationEEEV-Hp
Voxel sizeX=Y=Z: 1.73 Å
Density
Contour LevelBy AUTHOR: 1 / Movie #1: 1
Minimum - Maximum-6.766335 - 11.763959
Average (Standard dev.)0.00000000150 (±1)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-256-256-256
Dimensions512512512
Spacing512512512
CellA=B=C: 885.76 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.731.731.73
M x/y/z512512512
origin x/y/z0.0000.0000.000
length x/y/z885.760885.760885.760
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ280280280
MAP C/R/S123
start NC/NR/NS-256-256-256
NC/NR/NS512512512
D min/max/mean-6.76611.7640.000

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Supplemental data

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Sample components

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Entire : EEEV glycoproteins bound with heparan

EntireName: EEEV glycoproteins bound with heparan
Components
  • Virus: Eastern equine encephalitis virus
    • Protein or peptide: E1
    • Protein or peptide: E2

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Supramolecule #1: Eastern equine encephalitis virus

SupramoleculeName: Eastern equine encephalitis virus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / NCBI-ID: 11021 / Sci species name: Eastern equine encephalitis virus / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: Yes
Host systemOrganism: Cricetinae gen. sp. (mammal) / Recombinant cell: BHK-15

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Macromolecule #1: E1

MacromoleculeName: E1 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO / EC number: togavirin
Source (natural)Organism: Eastern equine encephalitis virus
Molecular weightTheoretical: 47.938141 KDa
Recombinant expressionOrganism: Cricetinae gen. sp. (mammal)
SequenceString: YEHTAVMPNK VGIPYKALVE RPGYAPVHLQ IQLVNTRIIP STNLEYITCK YKTKVPSPVV KCCGATQCTS KPHPDYQCQV FTGVYPFMW GGAYCFCDTE NTQMSEAYVE RSEECSIDHA KAYKVHTGTV QAMVNITYGS VSWRSADVYV NGETPAKIGD A KLIIGPLS ...String:
YEHTAVMPNK VGIPYKALVE RPGYAPVHLQ IQLVNTRIIP STNLEYITCK YKTKVPSPVV KCCGATQCTS KPHPDYQCQV FTGVYPFMW GGAYCFCDTE NTQMSEAYVE RSEECSIDHA KAYKVHTGTV QAMVNITYGS VSWRSADVYV NGETPAKIGD A KLIIGPLS SAWSPFDNKV VVYGHEVYNY DFPEYGTGKA GSFGDLQSRT STSNDLYANT NLKLQRPQAG IVHTPFTQAP SG FERWKRD KGAPLNDVAP FGCSIALEPL RAENCAVGSI PISIDIPDAA FTRISETPTV SDLECKITEC TYASDFGGIA TVA YKSSKA GNCPIHSPSG VAVIKENDVT LAESGSFTFH FSTANIHPAF KLQVCTSAVT CKGDCKPPKD HIVDYPAQHT ESFT SAISA TAWSWLKVLV GGTSAFIVLG LIATAVVALV LFFHRH

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Macromolecule #2: E2

MacromoleculeName: E2 / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO / EC number: togavirin
Source (natural)Organism: Eastern equine encephalitis virus
Molecular weightTheoretical: 47.046953 KDa
Recombinant expressionOrganism: Cricetinae gen. sp. (mammal)
SequenceString: DLDTHFTQYK LARPYIADCP NCGHSRCDSP IAIEEVRGDA HAGVIRIQTS AMFGLKTDGV DLAYMSFMNG KTQKSIKIDN LHVRTSAPC SLVSHHGYYI LAQCPPGDTV TVGFHDGPNR HTCTVAHKVE FRPVGREKYR HPPEHGVELP CNRYTHKRAD Q GHYVEMHQ ...String:
DLDTHFTQYK LARPYIADCP NCGHSRCDSP IAIEEVRGDA HAGVIRIQTS AMFGLKTDGV DLAYMSFMNG KTQKSIKIDN LHVRTSAPC SLVSHHGYYI LAQCPPGDTV TVGFHDGPNR HTCTVAHKVE FRPVGREKYR HPPEHGVELP CNRYTHKRAD Q GHYVEMHQ PGLVADHSLL SIHSAKVKIT VPSGAQVKYY CKCPDVREGI TSSDHTTTCT DVKQCRAYLI DNKKWVYNSG RL PRGEGDT FKGKLHVPFV PVKAKCIATL APEPLVEHKH RTLILHLHPD HPTLLTTRSL GSDANPTRQW IERPTTVNFT VTG EGLEYT WGNHPPKRVW AQESGEGNPH GWPHEVVVYY YNRYPLTTII GLCTCVAIIM VSCVTSVWLL CRTRNLCITP YKLA PNAQV PILLALLCCI KPTRA

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.5 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
25.0 mMC4H11NO3Tris
100.0 mMNaClSodium chloridesodium chloride
0.1 mMC10H16N2O8EDTAEthylenediaminetetraacetic acid

Details: Tris
GridMaterial: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: LACEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.02 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 80 % / Chamber temperature: 298 K / Instrument: GATAN CRYOPLUNGE 3

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 32.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 17022
CTF correctionSoftware - Name: CTFFIND (ver. 4)
Startup modelType of model: OTHER / Details: Used the jspr software to generate initial models.
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: jspr
Final angle assignmentType: PROJECTION MATCHING / Software - Name: jspr
Final reconstructionApplied symmetry - Point group: I (icosahedral) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 5.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: jspr / Number images used: 17022
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6mx4

RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-6odf:
EEEV glycoproteins bound with heparan sulfate

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