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- EMDB-28531: Cryo-EM structure of SARS-CoV-2 Spike trimer S2D14 in the 3-RBD D... -

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Basic information

Entry
Database: EMDB / ID: EMD-28531
TitleCryo-EM structure of SARS-CoV-2 Spike trimer S2D14 in the 3-RBD Down conformation
Map dataDesigned SARS-CoV-2 Spike antigen, S2D14, with three RBDs in the down conformation.
Sample
  • Complex: SARS-CoV-2 Spike trimer
    • Protein or peptide: Spike glycoproteinSpike protein
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
KeywordsGlycoprotein / trimer / VIRAL PROTEIN
Function / homology
Function and homology information


Maturation of spike protein / viral translation / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / suppression by virus of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / entry receptor-mediated virion attachment to host cell ...Maturation of spike protein / viral translation / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / suppression by virus of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / entry receptor-mediated virion attachment to host cell / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / receptor-mediated endocytosis of virus by host cell / Attachment and Entry / membrane fusion / positive regulation of viral entry into host cell / receptor-mediated virion attachment to host cell / receptor ligand activity / host cell surface receptor binding / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / virion attachment to host cell / SARS-CoV-2 activates/modulates innate and adaptive immune responses / host cell plasma membrane / virion membrane / membrane / identical protein binding / plasma membrane
Similarity search - Function
Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / 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 ...Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / 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
Biological speciesSevere acute respiratory syndrome coronavirus 2
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsWilliams JA / Harshbarger W
Funding support United States, 1 items
OrganizationGrant numberCountry
Other private United States
CitationJournal: Sci Adv / Year: 2023
Title: Structural and computational design of a SARS-CoV-2 spike antigen with improved expression and immunogenicity.
Authors: James A Williams / Marco Biancucci / Laura Lessen / Sai Tian / Ankita Balsaraf / Lynn Chen / Chelsy Chesterman / Giulietta Maruggi / Sarah Vandepaer / Ying Huang / Corey P Mallett / Ann- ...Authors: James A Williams / Marco Biancucci / Laura Lessen / Sai Tian / Ankita Balsaraf / Lynn Chen / Chelsy Chesterman / Giulietta Maruggi / Sarah Vandepaer / Ying Huang / Corey P Mallett / Ann-Muriel Steff / Matthew James Bottomley / Enrico Malito / Newton Wahome / Wayne D Harshbarger /
Abstract: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern challenge the efficacy of approved vaccines, emphasizing the need for updated spike antigens. Here, we use an ...Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern challenge the efficacy of approved vaccines, emphasizing the need for updated spike antigens. Here, we use an evolutionary-based design aimed at boosting protein expression levels of S-2P and improving immunogenic outcomes in mice. Thirty-six prototype antigens were generated in silico and 15 were produced for biochemical analysis. S2D14, which contains 20 computationally designed mutations within the S2 domain and a rationally engineered D614G mutation in the SD2 domain, has an ~11-fold increase in protein yield and retains RBD antigenicity. Cryo-electron microscopy structures reveal a mixture of populations in various RBD conformational states. Vaccination of mice with adjuvanted S2D14 elicited higher cross-neutralizing antibody titers than adjuvanted S-2P against the SARS-CoV-2 Wuhan strain and four variants of concern. S2D14 may be a useful scaffold or tool for the design of future coronavirus vaccines, and the approaches used for the design of S2D14 may be broadly applicable to streamline vaccine discovery.
History
DepositionOct 6, 2022-
Header (metadata) releaseJun 21, 2023-
Map releaseJun 21, 2023-
UpdateJun 21, 2023-
Current statusJun 21, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28531.png

Downloads & links

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Map

FileDownload / File: emd_28531.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationDesigned SARS-CoV-2 Spike antigen, S2D14, with three RBDs in the down conformation.
Voxel sizeX=Y=Z: 0.67 Å
Density
Contour LevelBy AUTHOR: 0.012
Minimum - Maximum-0.03541102 - 0.09153267
Average (Standard dev.)0.00006340893 (±0.0023680567)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 343.04 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half1 - Designed SARS-CoV-2 Spike antigen, S2D14, with...

Fileemd_28531_half_map_1.map
AnnotationHalf1 - Designed SARS-CoV-2 Spike antigen, S2D14, with three RBDs in the down conformation.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half1 - Designed SARS-CoV-2 Spike antigen, S2D14, with...

Fileemd_28531_half_map_2.map
AnnotationHalf1 - Designed SARS-CoV-2 Spike antigen, S2D14, with three RBDs in the down conformation.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : SARS-CoV-2 Spike trimer

EntireName: SARS-CoV-2 Spike trimer
Components
  • Complex: SARS-CoV-2 Spike trimer
    • Protein or peptide: Spike glycoproteinSpike protein
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: SARS-CoV-2 Spike trimer

SupramoleculeName: SARS-CoV-2 Spike trimer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 550 KDa

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Macromolecule #1: Spike glycoprotein

MacromoleculeName: Spike glycoprotein / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 123.913258 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: AYTNSFTRGV YYPDKVFRSS VLHSTQDLFL PFFSNVTWFH AIHVSGTNGT KRFDNPVLPF NDGVYFASTE KSNIIRGWIF GTTLDSKTQ SLLIVNNATN VVIKVCEFQF CNDPFLGVYY HKNNKSWMES EFRVYSSANN CTFEYVSQPF LMDLEGKQGN F KNLREFVF ...String:
AYTNSFTRGV YYPDKVFRSS VLHSTQDLFL PFFSNVTWFH AIHVSGTNGT KRFDNPVLPF NDGVYFASTE KSNIIRGWIF GTTLDSKTQ SLLIVNNATN VVIKVCEFQF CNDPFLGVYY HKNNKSWMES EFRVYSSANN CTFEYVSQPF LMDLEGKQGN F KNLREFVF KNIDGYFKIY SKHTPINLVR DLPQGFSALE PLVDLPIGIN ITRFQTLLAL HRSYLTPGDS SSGWTAGAAA YY VGYLQPR TFLLKYNENG TITDAVDCAL DPLSETKCTL KSFTVEKGIY QTSNFRVQPT ESIVRFPNIT NLCPFGEVFN ATR FASVYA WNRKRISNCV ADYSVLYNSA SFSTFKCYGV SPTKLNDLCF TNVYADSFVI RGDEVRQIAP GQTGKIADYN YKLP DDFTG CVIAWNSNNL DSKVGGNYNY LYRLFRKSNL KPFERDISTE IYQAGSTPCN GVEGFNCYFP LQSYGFQPTN GVGYQ PYRV VVLSFELLHA PATVCGPKKS TNLVKNKCVN FNFNGLTGTG VLTESNKKFL PFQQFGRDIA DTTDAVRDPQ TLEILD ITP CSFGGVSVIT PGTNTSNQVA VLYQGVNCTE VPVAIHADQL TPTWRVYSTG SNVFQTRAGC LIGAEHVNNS YECDIPI GA GICASYQTQT NSPGSASSVA SQSIIAYTMS LGEENSVAYS NNSIAIPTNF TISVTTEIIP VSMQKVSVDC TMYICGDS E ECSNLLLQYG SFCTQLNRAL HEIAVEQDKN TQEVFAQVKQ IYKTPPIKDF GGFNFSQILP DPSKPSKRSA IEDLLFNKV TLADAGFIKG YGDCLGDIAA RDLICAQKFN GLTVLPPLLT DEMIAAYTSA LLAGTITAGW TFGAGAALQI PFAMQMAYRF NGIGVTQNV LYENQKLIAN QFNKAIGKIQ DGLSSTASAL GKLQDVVNQN AQALNTLVKQ LSSNFGAISS VLNDILSRLD P PEAEVQID RLINGRLQAL NTYVTQQLIR AAEIRASANL AAEKMSECVL GQSKRVDFCG KGYHLMSFPQ SAPHGVVFLH VT YVPTQYK NFTTAPAICH NGKAHFPREG VFVSNGTHWF VTQRNFYEPQ IITTDNTFVS GDCDVVIGIV NNTVYDPLQP ELD S

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Macromolecule #4: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 4 / Number of copies: 15 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine

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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

Concentration0.40 mg/mL
BufferpH: 7.5 / Details: 10mM Tris + 150mM NaCl
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 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: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 120000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Number real images: 6169 / Average exposure time: 12.21 sec. / Average electron dose: 43.45 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 724002
Startup modelType of model: OTHER
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final reconstructionApplied symmetry - Point group: C3 (3 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 33173
FSC plot (resolution estimation)

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