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- EMDB-23147: The structure of an infectious immature flavivirus redefines vira... -

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Basic information

Entry
Database: EMDB / ID: EMD-23147
TitleThe structure of an infectious immature flavivirus redefines viral architecture and maturation
Map dataLocal-resolution filtered map
Sample
  • Virus: Binjari virus
    • Protein or peptide: Envelope protein E
    • Protein or peptide: prM protein
KeywordsFlavivirus / glycoprotein / fusion / VIRUS
Function / homology
Function and homology information


: / ribonucleoside triphosphate phosphatase activity / viral capsid / double-stranded RNA binding / methyltransferase cap1 activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA helicase activity / protein dimerization activity / host cell endoplasmic reticulum membrane / symbiont-mediated suppression of host innate immune response ...: / ribonucleoside triphosphate phosphatase activity / viral capsid / double-stranded RNA binding / methyltransferase cap1 activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA helicase activity / protein dimerization activity / host cell endoplasmic reticulum membrane / symbiont-mediated suppression of host innate immune response / symbiont entry into host cell / serine-type endopeptidase activity / viral RNA genome replication / RNA-directed RNA polymerase activity / fusion of virus membrane with host endosome membrane / virion attachment to host cell / host cell nucleus / virion membrane / structural molecule activity / proteolysis / extracellular region / ATP binding / metal ion binding / membrane
Similarity search - Function
Flavivirus non-structural protein NS2B / Flavivirus capsid protein C superfamily / Genome polyprotein, Flavivirus / : / Flavivirus non-structural protein NS4A / Flavivirus non-structural protein NS2B / Flavivirus non-structural protein NS4B / mRNA cap 0/1 methyltransferase / Flavivirus non-structural protein NS4B / Flavivirus non-structural protein NS4A ...Flavivirus non-structural protein NS2B / Flavivirus capsid protein C superfamily / Genome polyprotein, Flavivirus / : / Flavivirus non-structural protein NS4A / Flavivirus non-structural protein NS2B / Flavivirus non-structural protein NS4B / mRNA cap 0/1 methyltransferase / Flavivirus non-structural protein NS4B / Flavivirus non-structural protein NS4A / Flavivirus NS2B domain profile. / mRNA cap 0 and cap 1 methyltransferase (EC 2.1.1.56 and EC 2.1.1.57) domain profile. / Flavivirus non-structural protein NS2A / Flavivirus non-structural protein NS2A / Flavivirus NS3, petidase S7 / Peptidase S7, Flavivirus NS3 serine protease / Flavivirus NS3 protease (NS3pro) domain profile. / RNA-directed RNA polymerase, thumb domain, Flavivirus / Flavivirus RNA-directed RNA polymerase, thumb domain / RNA-directed RNA polymerase, flavivirus / Flavivirus RNA-directed RNA polymerase, fingers and palm domains / Flavivirus capsid protein C / Flavivirus capsid protein C / Flavivirus non-structural Protein NS1 / Flavivirus non-structural protein NS1 / Envelope glycoprotein M, flavivirus / Envelope glycoprotein M superfamily, flavivirus / Flavivirus envelope glycoprotein M / Flavivirus polyprotein propeptide / Flavivirus polyprotein propeptide superfamily / Flavivirus polyprotein propeptide / Flavivirus envelope glycoprotein E, stem/anchor domain / : / Flavivirus NS3 helicase, C-terminal helical domain / Flavivirus envelope glycoprotein E, Stem/Anchor domain / Flavivirus envelope glycoprotein E, Stem/Anchor domain superfamily / Flavivirus glycoprotein E, immunoglobulin-like domain / Flavivirus glycoprotein, immunoglobulin-like domain / Flavivirus glycoprotein central and dimerisation domain / Flavivirus glycoprotein, central and dimerisation domains / Flaviviral glycoprotein E, central domain, subdomain 1 / Flaviviral glycoprotein E, central domain, subdomain 2 / Ribosomal RNA methyltransferase, FtsJ domain / FtsJ-like methyltransferase / Flavivirus/Alphavirus glycoprotein, immunoglobulin-like domain superfamily / Flavivirus glycoprotein, central and dimerisation domain superfamily / Flaviviral glycoprotein E, dimerisation domain / DEAD box, Flavivirus / Flavivirus DEAD domain / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Immunoglobulin E-set / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / RNA-directed RNA polymerase, catalytic domain / RdRp of positive ssRNA viruses catalytic domain profile. / S-adenosyl-L-methionine-dependent methyltransferase superfamily / Peptidase S1, PA clan / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Biological speciesBinjari virus
Methodsingle particle reconstruction / cryo EM / Resolution: 4.4 Å
AuthorsHardy JM / Venugopal HV
Funding support Australia, 1 items
OrganizationGrant numberCountry
National Health and Medical Research Council (NHMRC, Australia)APP1164216 Australia
CitationJournal: Sci Adv / Year: 2021
Title: The structure of an infectious immature flavivirus redefines viral architecture and maturation.
Authors: Natalee D Newton / Joshua M Hardy / Naphak Modhiran / Leon E Hugo / Alberto A Amarilla / Summa Bibby / Hariprasad Venugopal / Jessica J Harrison / Renee J Traves / Roy A Hall / Jody Hobson- ...Authors: Natalee D Newton / Joshua M Hardy / Naphak Modhiran / Leon E Hugo / Alberto A Amarilla / Summa Bibby / Hariprasad Venugopal / Jessica J Harrison / Renee J Traves / Roy A Hall / Jody Hobson-Peters / Fasséli Coulibaly / Daniel Watterson /
Abstract: Flaviviruses are the cause of severe human diseases transmitted by mosquitoes and ticks. These viruses use a potent fusion machinery to enter target cells that needs to be restrained during viral ...Flaviviruses are the cause of severe human diseases transmitted by mosquitoes and ticks. These viruses use a potent fusion machinery to enter target cells that needs to be restrained during viral assembly and egress. A molecular chaperone, premembrane (prM) maintains the virus particles in an immature, fusion-incompetent state until they exit the cell. Taking advantage of an insect virus that produces particles that are both immature and infectious, we determined the structure of the first immature flavivirus with a complete spike by cryo-electron microscopy. Unexpectedly, the prM chaperone forms a supporting pillar that maintains the immature spike in an asymmetric and upright state, primed for large rearrangements upon acidification. The collapse of the spike along a path defined by the prM chaperone is required, and its inhibition by a multivalent immunoglobulin M blocks infection. The revised architecture and collapse model are likely to be conserved across flaviviruses.
History
DepositionDec 17, 2020-
Header (metadata) releaseMar 10, 2021-
Map releaseMar 10, 2021-
UpdateNov 20, 2024-
Current statusNov 20, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.027
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.027
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7l30
  • Surface level: 0.027
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7l30
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23147.png

Downloads & links

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Map

FileDownload / File: emd_23147.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationLocal-resolution filtered map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.34 Å/pix.
x 512 pix.
= 686.08 Å		1.34 Å/pix.
x 512 pix.
= 686.08 Å		1.34 Å/pix.
x 512 pix.
= 686.08 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.34 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.027 / Movie #1: 0.027
Minimum - Maximum-0.06158375 - 0.1203755
Average (Standard dev.)0.0007684218 (±0.0075564524)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 686.08 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.341.341.34
M x/y/z512512512
origin x/y/z0.0000.0000.000
length x/y/z686.080686.080686.080
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS512512512
D min/max/mean-0.0620.1200.001

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Supplemental data

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Sample components

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Entire : Binjari virus

EntireName: Binjari virus
Components
  • Virus: Binjari virus
    • Protein or peptide: Envelope protein E
    • Protein or peptide: prM protein

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Supramolecule #1: Binjari virus

SupramoleculeName: Binjari virus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all
Details: M and E from Binjari virus form a complex that assembles into anti-parallel dimers, (M-E)2, in the T=3 icosahedral particle.
NCBI-ID: 2305258 / Sci species name: Binjari virus / Sci species strain: BFTA20 / Virus type: VIRION / Virus isolate: SPECIES / Virus enveloped: Yes / Virus empty: No
Host (natural)Organism: Ochlerotatus normanensis (mosquito)
Molecular weightTheoretical: 22 MDa
Virus shellShell ID: 1 / Diameter: 470.0 Å / T number (triangulation number): 3

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Macromolecule #1: Envelope protein E

MacromoleculeName: Envelope protein E / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Binjari virus
Molecular weightTheoretical: 53.495086 KDa
Recombinant expressionOrganism: Aedes albopictus (Asian tiger mosquito)
SequenceString: NQCLDVQSRD FVQGVSGGTW VDVVLDHDNC ITIVADGKPS FDIRLSKMSM SKFAEYKRYC LQATMSDVTS IVACPGAGDA HNDKSKNHE YICKAVNNDR GWGNGCVLFG KGSMETCGKF ECKKKMAGKL VARENVESVV TVHVHGASAT DTKGVDTAST A KATITPKA ...String:
NQCLDVQSRD FVQGVSGGTW VDVVLDHDNC ITIVADGKPS FDIRLSKMSM SKFAEYKRYC LQATMSDVTS IVACPGAGDA HNDKSKNHE YICKAVNNDR GWGNGCVLFG KGSMETCGKF ECKKKMAGKL VARENVESVV TVHVHGASAT DTKGVDTAST A KATITPKA SVATLNLNDF GSLEVDCSTD VGMDFGEIVV ADMSGKWWIV NKDWFNELAL PWSTASTTAE VWQARDRLVE FG WPHAAKQ NIYDIGDQEG AVTAAIAQAP MAKWESDKVE LISGILKCKV KLGNLKLRGV TYSMCAQTFT TETRPADTGH GTV AFKVKY VGTDVPCRVP LHIIDSDGGV AAGRVITAHP FVMKQNDYII LEVEPPFGDS KIEIGTGTTK LVEAWHRKGS SIGN AFTAT YKGITKLTVL GEHAWDFNSL GGFGASLGKA VHTLFGGVFR VMFGGMGWLT KIFVGAVLVW LGLGAHDKTI ATTMI LVGS ILMYMAVTVG ALS

UniProtKB: Genome polyprotein

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Macromolecule #2: prM protein

MacromoleculeName: prM protein / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Binjari virus
Molecular weightTheoretical: 18.946809 KDa
Recombinant expressionOrganism: Aedes albopictus (Asian tiger mosquito)
SequenceString:
ATLRTVGDLT WLNVSTTDVG KWIRVENRHG KGECFVTATD VGTWCSDSVG YECPQIAPAY DPEDLDCYCR NTSTYVTYGR CKNGRSGRS RSKRAITIAP HGEAGLRVGS TKHWTSRATP QRYLMRVEKW VLRHPLPALV LVVLGWMMGR SHGQRAMYIV L MLLVAPSY G

UniProtKB: Genome polyprotein

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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

Concentration4 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
12.0 mM(HOCH2)3CNH2Tris
120.0 mMNaClsodium chloride
1.0 mMC10H16N2O8Ethylenediaminetetraacetic acid (EDTA)
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
Details: 0 second wait time 2.5 second blot time -4 blot force 1 second drain time.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: SUPER-RESOLUTION / Number grids imaged: 1 / Number real images: 6226 / Average exposure time: 12.8 sec. / Average electron dose: 43.2768 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated defocus max: 4.3 µm / Calibrated defocus min: 0.1 µm / Calibrated magnification: 105000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 55992
Startup modelType of model: EMDB MAP
EMDB ID:

2141

Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: I (icosahedral) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 4.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 26038
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final 3D classificationSoftware - Name: RELION (ver. 3.1)

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Atomic model buiding 1

Initial model
PDB IDChain

6co8

source_name: PDB, initial_model_type: experimental model

4b03

source_name: PDB, initial_model_type: experimental model

5o6v

source_name: PDB, initial_model_type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-7l30:
Binjari virus (BinJV)

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