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- EMDB-27438: Cryo-EM structure of SARS-CoV-2 Beta (B.1.351) spike protein in c... -

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Basic information

Entry
Database: EMDB / ID: EMD-27438
TitleCryo-EM structure of SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6
Map data
Sample
  • Complex: SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6
    • Complex: SARS-CoV-2 Beta (B.1.351) spike protein
      • Protein or peptide: SARS-CoV-2 Beta (B.1.351) spike protein
    • Complex: VH F6
      • Protein or peptide: VH F6
Biological speciesSevere acute respiratory syndrome coronavirus 2 / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.83 Å
AuthorsZhu X / Saville JW / Mannar D / Berezuk AM / Subramaniam S
Funding support Canada, 2 items
OrganizationGrant numberCountry
Canada Excellence Research Chair AwardPrecision Cancer Drug Design Canada
Other governmentCOVID-19 research Canada
CitationJournal: iScience / Year: 2022
Title: Potent and broad neutralization of SARS-CoV-2 variants of concern (VOCs) including omicron sub-lineages BA.1 and BA.2 by biparatopic human VH domains.
Authors: Chuan Chen / James W Saville / Michelle M Marti / Alexandra Schäfer / Mary Hongying Cheng / Dhiraj Mannar / Xing Zhu / Alison M Berezuk / Anupam Banerjee / Michele D Sobolewski / Andrew Kim ...Authors: Chuan Chen / James W Saville / Michelle M Marti / Alexandra Schäfer / Mary Hongying Cheng / Dhiraj Mannar / Xing Zhu / Alison M Berezuk / Anupam Banerjee / Michele D Sobolewski / Andrew Kim / Benjamin R Treat / Priscila Mayrelle Da Silva Castanha / Nathan Enick / Kevin D McCormick / Xianglei Liu / Cynthia Adams / Margaret Grace Hines / Zehua Sun / Weizao Chen / Jana L Jacobs / Simon M Barratt-Boyes / John W Mellors / Ralph S Baric / Ivet Bahar / Dimiter S Dimitrov / Sriram Subramaniam / David R Martinez / Wei Li /
Abstract: The emergence of SARS-CoV-2 variants of concern (VOCs) requires the development of next-generation biologics with high neutralization breadth. Here, we characterized a human V domain, F6, which we ...The emergence of SARS-CoV-2 variants of concern (VOCs) requires the development of next-generation biologics with high neutralization breadth. Here, we characterized a human V domain, F6, which we generated by sequentially panning large phage-displayed V libraries against receptor binding domains (RBDs) containing VOC mutations. Cryo-EM analyses reveal that F6 has a unique binding mode that spans a broad surface of the RBD and involves the antibody framework region. Attachment of an Fc region to a fusion of F6 and ab8, a previously characterized V domain, resulted in a construct (F6-ab8-Fc) that broadly and potently neutralized VOCs including Omicron. Additionally, prophylactic treatment using F6-ab8-Fc reduced live Beta (B.1.351) variant viral titers in the lungs of a mouse model. Our results provide a new potential therapeutic against SARS-CoV-2 variants including Omicron and highlight a vulnerable epitope within the spike that may be exploited to achieve broad protection against circulating variants.
History
DepositionJun 28, 2022-
Header (metadata) releaseAug 24, 2022-
Map releaseAug 24, 2022-
UpdateAug 24, 2022-
Current statusAug 24, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_27438.png

Downloads & links

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Map

FileDownload / File: emd_27438.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1 Å
Density
Contour LevelBy AUTHOR: 0.123
Minimum - Maximum-0.49213362 - 1.0293423
Average (Standard dev.)-0.00034906747 (±0.024623388)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 400.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_27438_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_27438_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6

EntireName: SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6
Components
  • Complex: SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6
    • Complex: SARS-CoV-2 Beta (B.1.351) spike protein
      • Protein or peptide: SARS-CoV-2 Beta (B.1.351) spike protein
    • Complex: VH F6
      • Protein or peptide: VH F6

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Supramolecule #1: SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6

SupramoleculeName: SARS-CoV-2 Beta (B.1.351) spike protein in complex with VH domain F6
type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2

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Supramolecule #2: SARS-CoV-2 Beta (B.1.351) spike protein

SupramoleculeName: SARS-CoV-2 Beta (B.1.351) spike protein / type: complex / Chimera: Yes / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Recombinant expressionOrganism: Homo sapiens (human)

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Supramolecule #3: VH F6

SupramoleculeName: VH F6 / type: complex / Chimera: Yes / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Escherichia coli (E. coli)

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Macromolecule #1: SARS-CoV-2 Beta (B.1.351) spike protein

MacromoleculeName: SARS-CoV-2 Beta (B.1.351) spike protein / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
SequenceString: MFVFLVLLPL VSSQCVNFTT RTQLPPAYTN SFTRGVYYPD KVFRSSVLHS TQDLFLPFFS NVTWFHAIHV SGTNGTKRFA NPVLPFNDGV YFASTEKSNI IRGWIFGTTL DSKTQSLLIV NNATNVVIKV CEFQFCNDPF LGVYYHKNNK SWMESEFRVY SSANNCTFEY ...String:
MFVFLVLLPL VSSQCVNFTT RTQLPPAYTN SFTRGVYYPD KVFRSSVLHS TQDLFLPFFS NVTWFHAIHV SGTNGTKRFA NPVLPFNDGV YFASTEKSNI IRGWIFGTTL DSKTQSLLIV NNATNVVIKV CEFQFCNDPF LGVYYHKNNK SWMESEFRVY SSANNCTFEY VSQPFLMDLE GKQGNFKNLR EFVFKNIDGY FKIYSKHTPI NLVRGLPQGF SALEPLVDLP IGINITRFQT LLALHISYLT PGDSSSGWTA GAAAYYVGYL QPRTFLLKYN ENGTITDAVD CALDPLSETK CTLKSFTVEK GIYQTSNFRV QPTESIVRFP NITNLCPFGE VFNATRFASV YAWNRKRISN CVADYSVLYN SASFSTFKCY GVSPTKLNDL CFTNVYADSF VIRGDEVRQI APGQTGNIAD YNYKLPDDFT GCVIAWNSNN LDSKVGGNYN YLYRLFRKSN LKPFERDIST EIYQAGSTPC NGVKGFNCYF PLQSYGFQPT YGVGYQPYRV VVLSFELLHA PATVCGPKKS TNLVKNKCVN FNFNGLTGTG VLTESNKKFL PFQQFGRDIA DTTDAVRDPQ TLEILDITPC SFGGVSVITP GTNTSNQVAV LYQGVNCTEV PVAIHADQLT PTWRVYSTGS NVFQTRAGCL IGAEHVNNSY ECDIPIGAGI CASYQTQTNS PGSASSVASQ SIIAYTMSLG VENSVAYSNN SIAIPTNFTI SVTTEILPVS MTKTSVDCTM YICGDSTECS NLLLQYGSFC TQLNRALTGI AVEQDKNTQE VFAQVKQIYK TPPIKDFGGF NFSQILPDPS KPSKRSPIED LLFNKVTLAD AGFIKQYGDC LGDIAARDLI CAQKFNGLTV LPPLLTDEMI AQYTSALLAG TITSGWTFGA GPALQIPFPM QMAYRFNGIG VTQNVLYENQ KLIANQFNSA IGKIQDSLSS TPSALGKLQD VVNQNAQALN TLVKQLSSNF GAISSVLNDI LSRLDPPEAE VQIDRLITGR LQSLQTYVTQ QLIRAAEIRA SANLAATKMS ECVLGQSKRV DFCGKGYHLM SFPQSAPHGV VFLHVTYVPA QEKNFTTAPA ICHDGKAHFP REGVFVSNGT HWFVTQRNFY EPQIITTDNT FVSGNCDVVI GIVNNTVYDP LQPELDSFKE ELDKYFKNHT SPDVDLGDIS GINASVVNIQ KEIDRLNEVA KNLNESLIDL QELGKYEQGS GYIPEAPRDG QAYVRKDGEW VLLSTFLGRS LEVLFQGPGH HHHHHHHSAW SHPQFEKGGG SGGGGSGGSA WSHPQFEK

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Macromolecule #2: VH F6

MacromoleculeName: VH F6 / type: protein_or_peptide / ID: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
SequenceString:
EVQLVESGGG LVQPGGSLRL SCAASDFDFY DYEMSWVRQA PGKALEWIGN IYYSGDTFYN PSLKSRVTIS RDNSKNTLYL QMNSLRAEDT ATYYCARVES GSGWLDFWGQ GTLVTVSS

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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

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.5 µm
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 40.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.83 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 57496
FSC plot (resolution estimation)

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