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- EMDB-8792: MERS S ectodomain trimer in complex with Fab of neutralizing anti... -

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Basic information

Entry
Database: EMDB / ID: EMD-8792
TitleMERS S ectodomain trimer in complex with Fab of neutralizing antibody G4
Map dataMERS S ectodomain trimer in complex with variable domain of neutralizing antibody G4
Sample
  • Complex: MERS S ectodomain trimer in complex with Fab of neutralizing antibody G4
Function / homology
Function and homology information


endocytosis involved in viral entry into host cell / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / membrane fusion / positive regulation of viral entry into host cell / receptor-mediated virion attachment to host cell / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / host cell plasma membrane / virion membrane / membrane
Similarity search - Function
Spike (S) protein S1 subunit, receptor-binding domain, MERS-CoV / Spike (S) protein S1 subunit, N-terminal domain, MERS-CoV-like / Spike glycoprotein S2, coronavirus, C-terminal / Coronavirus spike glycoprotein S2, intravirion / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Spike glycoprotein, N-terminal domain superfamily / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike glycoprotein, betacoronavirus / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus ...Spike (S) protein S1 subunit, receptor-binding domain, MERS-CoV / Spike (S) protein S1 subunit, N-terminal domain, MERS-CoV-like / Spike glycoprotein S2, coronavirus, C-terminal / Coronavirus spike glycoprotein S2, intravirion / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Spike glycoprotein, N-terminal domain superfamily / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike glycoprotein, betacoronavirus / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus / Betacoronavirus spike glycoprotein S1, receptor binding / Spike glycoprotein S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / Spike glycoprotein S2, coronavirus, heptad repeat 1 / Spike glycoprotein S2, coronavirus, heptad repeat 2 / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 2 (HR2) region profile. / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 1 (HR1) region profile. / Spike glycoprotein S2 superfamily, coronavirus / Spike glycoprotein S2, coronavirus / Coronavirus spike glycoprotein S2 / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal
Similarity search - Domain/homology
Spike glycoprotein / Spike glycoprotein
Similarity search - Component
Biological speciesMiddle East respiratory syndrome coronavirus
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsPallesen J / Ward AB
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P20GM113132 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01AI127521 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2017
Title: Immunogenicity and structures of a rationally designed prefusion MERS-CoV spike antigen.
Authors: Jesper Pallesen / Nianshuang Wang / Kizzmekia S Corbett / Daniel Wrapp / Robert N Kirchdoerfer / Hannah L Turner / Christopher A Cottrell / Michelle M Becker / Lingshu Wang / Wei Shi / Wing- ...Authors: Jesper Pallesen / Nianshuang Wang / Kizzmekia S Corbett / Daniel Wrapp / Robert N Kirchdoerfer / Hannah L Turner / Christopher A Cottrell / Michelle M Becker / Lingshu Wang / Wei Shi / Wing-Pui Kong / Erica L Andres / Arminja N Kettenbach / Mark R Denison / James D Chappell / Barney S Graham / Andrew B Ward / Jason S McLellan /
Abstract: Middle East respiratory syndrome coronavirus (MERS-CoV) is a lineage C betacoronavirus that since its emergence in 2012 has caused outbreaks in human populations with case-fatality rates of ∼36%. ...Middle East respiratory syndrome coronavirus (MERS-CoV) is a lineage C betacoronavirus that since its emergence in 2012 has caused outbreaks in human populations with case-fatality rates of ∼36%. As in other coronaviruses, the spike (S) glycoprotein of MERS-CoV mediates receptor recognition and membrane fusion and is the primary target of the humoral immune response during infection. Here we use structure-based design to develop a generalizable strategy for retaining coronavirus S proteins in the antigenically optimal prefusion conformation and demonstrate that our engineered immunogen is able to elicit high neutralizing antibody titers against MERS-CoV. We also determined high-resolution structures of the trimeric MERS-CoV S ectodomain in complex with G4, a stem-directed neutralizing antibody. The structures reveal that G4 recognizes a glycosylated loop that is variable among coronaviruses and they define four conformational states of the trimer wherein each receptor-binding domain is either tightly packed at the membrane-distal apex or rotated into a receptor-accessible conformation. Our studies suggest a potential mechanism for fusion initiation through sequential receptor-binding events and provide a foundation for the structure-based design of coronavirus vaccines.
History
DepositionJun 23, 2017-
Header (metadata) releaseJul 19, 2017-
Map releaseAug 16, 2017-
UpdateJan 29, 2020-
Current statusJan 29, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_8792.png

Downloads & links

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Map

FileDownload / File: emd_8792.map.gz / Format: CCP4 / Size: 107.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMERS S ectodomain trimer in complex with variable domain of neutralizing antibody G4
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.02 Å/pix.
x 304 pix.
= 310.08 Å		1.02 Å/pix.
x 304 pix.
= 310.08 Å		1.02 Å/pix.
x 304 pix.
= 310.08 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.02 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.015 / Movie #1: 0.015
Minimum - Maximum-0.041694004 - 0.094860636
Average (Standard dev.)0.00000091767 (±0.0037811648)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions304304304
Spacing304304304
CellA=B=C: 310.08 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.021.021.02
M x/y/z304304304
origin x/y/z0.0000.0000.000
length x/y/z310.080310.080310.080
α/β/γ90.00090.00090.000
start NX/NY/NZ-38-19-20
NX/NY/NZ858082
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS304304304
D min/max/mean-0.0420.0950.000

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Supplemental data

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Half map: MERS S ectodomain trimer in complex with variable...

Fileemd_8792_half_map_1.map
AnnotationMERS S ectodomain trimer in complex with variable domain of neutralizing antibody G4
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: MERS S ectodomain trimer in complex with variable...

Fileemd_8792_half_map_2.map
AnnotationMERS S ectodomain trimer in complex with variable domain of neutralizing antibody G4
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : MERS S ectodomain trimer in complex with Fab of neutralizing anti...

EntireName: MERS S ectodomain trimer in complex with Fab of neutralizing antibody G4
Components
  • Complex: MERS S ectodomain trimer in complex with Fab of neutralizing antibody G4

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Supramolecule #1: MERS S ectodomain trimer in complex with Fab of neutralizing anti...

SupramoleculeName: MERS S ectodomain trimer in complex with Fab of neutralizing antibody G4
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Middle East respiratory syndrome coronavirus
Recombinant expressionOrganism: Homo sapiens (human)
Molecular weightTheoretical: 600 KDa

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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

Concentration1 mg/mL
BufferpH: 7.4 / Component - Name: TBS
GridModel: C-flat / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Atmosphere: OTHER
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.7 µm / Nominal magnification: 29000
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: COUNTING / Digitization - Sampling interval: 5.0 µm / Digitization - Frames/image: 1-35 / Number grids imaged: 1 / Average exposure time: 0.2 sec. / Average electron dose: 1.89 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 37180
CTF correctionSoftware - Name: CTFFIND3
Startup modelType of model: OTHER / Details: negative stain reconstruction.
Initial angle assignmentType: PROJECTION MATCHING / Software - Name: RELION (ver. 1.4)
Final 3D classificationSoftware - Name: RELION (ver. 1.4)
Final angle assignmentType: PROJECTION MATCHING / Software - Name: RELION (ver. 1.4)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 1.4) / Number images used: 37180
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: OTHER

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