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- EMDB-60351: Local CryoEM structure of the SARS-CoV-2 BA.5 in complex with ORB... -

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Basic information

Entry
Database: EMDB / ID: EMD-60351
TitleLocal CryoEM structure of the SARS-CoV-2 BA.5 in complex with ORB10 Fab
Map dataORB10 & RBD
Sample
  • Complex: SARS-CoV-2 BA.5 Spike in complex with ORB10 Fab
    • Protein or peptide: Spike glycoprotein,Fibritin
    • Protein or peptide: variable heavy chain of ORB10 Fab
    • Protein or peptide: variable light chain of ORB10 Fab
KeywordsSARS-CoV-2 / antibody / complex / VIRAL PROTEIN
Function / homology
Function and homology information


virion component / symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / viral translation / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion ...virion component / symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / viral translation / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / entry receptor-mediated virion attachment to host cell / membrane fusion / Attachment and Entry / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / positive regulation of viral entry into host cell / receptor-mediated virion attachment to host cell / host cell surface receptor binding / symbiont-mediated suppression of host innate immune response / receptor ligand activity / endocytosis involved in viral entry into host cell / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / symbiont entry into host cell / virion attachment to host cell / SARS-CoV-2 activates/modulates innate and adaptive immune responses / host cell plasma membrane / virion membrane / identical protein binding / membrane / plasma membrane
Similarity search - Function
Fibritin C-terminal / Fibritin C-terminal region / Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal / Spike glycoprotein, betacoronavirus / Spike glycoprotein, N-terminal domain superfamily / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. ...Fibritin C-terminal / Fibritin C-terminal region / Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal / Spike glycoprotein, betacoronavirus / Spike glycoprotein, N-terminal domain superfamily / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / 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 1 (HR1) region profile. / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 2 (HR2) region profile. / Spike glycoprotein S2 superfamily, coronavirus / Spike glycoprotein S2, coronavirus / Coronavirus spike glycoprotein S2
Similarity search - Domain/homology
Spike glycoprotein / Fibritin
Similarity search - Component
Biological speciesSevere acute respiratory syndrome coronavirus 2 / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsCao S / Leng C / Hu H
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)XDB0490401 China
CitationJournal: J Virol / Year: 2025
Title: Structural insights into hybridoma-derived neutralizing monoclonal antibodies against Omicron BA.5 and XBB.1.16 variants of SARS-CoV-2.
Authors: Hengrui Hu / Chao Leng / Yanni Shu / Lu Peng / Fan Wu / Jia Liu / Xiaolu Zhang / Wei Zhou / Qinghong Xiao / Yufeng Li / Bihao Wu / Jiamei Shen / Jiang Li / Rui Gong / Bing Yan / Fei Deng / ...Authors: Hengrui Hu / Chao Leng / Yanni Shu / Lu Peng / Fan Wu / Jia Liu / Xiaolu Zhang / Wei Zhou / Qinghong Xiao / Yufeng Li / Bihao Wu / Jiamei Shen / Jiang Li / Rui Gong / Bing Yan / Fei Deng / Zhihong Hu / Sheng Cao / Manli Wang /
Abstract: The emergence of novel variants of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) continues to pose an ongoing challenge for global public health services, highlighting the urgent need ...The emergence of novel variants of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) continues to pose an ongoing challenge for global public health services, highlighting the urgent need for effective therapeutic interventions. Neutralizing monoclonal antibodies (mAbs) are a major therapeutic strategy for the treatment of COVID-19 and other viral diseases. In this study, we employed hybridoma technology to generate mAbs that target the BA.5 receptor-binding domain (RBD) of the SARS-CoV-2 spike protein. Through a comprehensive screening process, we identified four mAbs capable of effectively neutralizing BA.5, XBB.1.16, and related variant infections , among which ORB10 was found to neutralize BA.5 variants with a plaque reduction neutralization test (PRNT) of 8.7 ng/mL. Additionally, competitive binding assays, sequencing of heavy and light chain variable regions, and binding kinetics characterization provided insights into the epitopes and binding affinities of the identified mAbs. Moreover, experiments in the K18-hACE2 mouse model demonstrated the protective efficacy of ORB10 against both BA.5 and XBB.1.16 variants. Finally, cryo-electron microscopy structural analysis of the ORB10-RBD complex identified key residues involved in the antibody-antigen interactions, providing insights into the molecular mechanisms of neutralization and immune escape of SARS-CoV-2 Omicron variants from mAbs.
IMPORTANCE: The ongoing evolution of SARS-CoV-2 has led to the emergence of variants capable of evading immune responses elicited by natural infection and vaccination, especially the highly ...IMPORTANCE: The ongoing evolution of SARS-CoV-2 has led to the emergence of variants capable of evading immune responses elicited by natural infection and vaccination, especially the highly transmissible and immune-evasive Omicron variants. This study generated and characterized a panel of monoclonal antibodies (mAbs) specifically targeting the RBD of the Omicron BA.5 variant, of which the ORB10 showed efficacy against Omicron BA.5 and XBB.1.16 variants both and . Cryo-EM structural analysis further elucidated the binding epitope interactions and neutralization mechanism between ORB10 and the BA.5 RBD protein. This study enhances our understanding of antibody-mediated neutralization of SARS-CoV-2 and provides valuable insights into the development of effective therapeutic strategies to combat ongoing SARS-CoV-2 variant infections.
History
DepositionMay 30, 2024-
Header (metadata) releaseDec 25, 2024-
Map releaseDec 25, 2024-
UpdateJul 16, 2025-
Current statusJul 16, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_60351.png

Downloads & links

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Map

FileDownload / File: emd_60351.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationORB10 & RBD
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.95 Å/pix.
x 400 pix.
= 380. Å		0.95 Å/pix.
x 400 pix.
= 380. Å		0.95 Å/pix.
x 400 pix.
= 380. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.95 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.303
Minimum - Maximum-3.0158696 - 5.4723883
Average (Standard dev.)-0.0014765734 (±0.05069281)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 380.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: half A map

Fileemd_60351_half_map_1.map
Annotationhalf_A_map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half B map

Fileemd_60351_half_map_2.map
Annotationhalf_B_map
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 BA.5 Spike in complex with ORB10 Fab

EntireName: SARS-CoV-2 BA.5 Spike in complex with ORB10 Fab
Components
  • Complex: SARS-CoV-2 BA.5 Spike in complex with ORB10 Fab
    • Protein or peptide: Spike glycoprotein,Fibritin
    • Protein or peptide: variable heavy chain of ORB10 Fab
    • Protein or peptide: variable light chain of ORB10 Fab

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Supramolecule #1: SARS-CoV-2 BA.5 Spike in complex with ORB10 Fab

SupramoleculeName: SARS-CoV-2 BA.5 Spike in complex with ORB10 Fab / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2

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Macromolecule #1: Spike glycoprotein,Fibritin

MacromoleculeName: Spike glycoprotein,Fibritin / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 139.437578 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MFVFLVLLPL VSSQCVNLIT RTQSYTNSFT RGVYYPDKVF RSSVLHSTQD LFLPFFSNVT WFHAISGTNG TKRFDNPVLP FNDGVYFAS TEKSNIIRGW IFGTTLDSKT QSLLIVNNAT NVVIKVCEFQ FCNDPFLDVY YHKNNKSWME SEFRVYSSAN N CTFEYVSQ ...String:
MFVFLVLLPL VSSQCVNLIT RTQSYTNSFT RGVYYPDKVF RSSVLHSTQD LFLPFFSNVT WFHAISGTNG TKRFDNPVLP FNDGVYFAS TEKSNIIRGW IFGTTLDSKT QSLLIVNNAT NVVIKVCEFQ FCNDPFLDVY YHKNNKSWME SEFRVYSSAN N CTFEYVSQ PFLMDLEGKQ GNFKNLREFV FKNIDGYFKI YSKHTPINLG RDLPQGFSAL EPLVDLPIGI NITRFQTLLA LH RSYLTPG DSSSGWTAGA AAYYVGYLQP RTFLLKYNEN GTITDAVDCA LDPLSETKCT LKSFTVEKGI YQTSNFRVQP TES IVRFPN ITNLCPFDEV FNATRFASVY AWNRKRISNC VADYSVLYNF APFFAFKCYG VSPTKLNDLC FTNVYADSFV IRGN EVSQI APGQTGNIAD YNYKLPDDFT GCVIAWNSNK LDSKVGGNYN YRYRLFRKSN LKPFERDIST EIYQAGNKPC NGVAG VNCY FPLQSYGFRP TYGVGHQPYR VVVLSFELLH APATVCGPKK STNLVKNKCV NFNFNGLTGT GVLTESNKKF LPFQQF GRD IADTTDAVRD PQTLEILDIT PCSFGGVSVI TPGTNTSNQV AVLYQGVNCT EVPVAIHADQ LTPTWRVYST GSNVFQT RA GCLIGAEYVN NSYECDIPIG AGICASYQTQ TKSHGSASSV ASQSIIAYTM SLGAENSVAY SNNSIAIPTN FTISVTTE I LPVSMTKTSV DCTMYICGDS TECSNLLLQY GSFCTQLKRA LTGIAVEQDK NTQEVFAQVK QIYKTPPIKY FGGFNFSQI LPDPSKPSKR SPIEDLLFNK VTLADAGFIK QYGDCLGDIA ARDLICAQKF NGLTVLPPLL TDEMIAQYTS ALLAGTITSG WTFGAGPAL QIPFPMQMAY RFNGIGVTQN VLYENQKLIA NQFNSAIGKI QDSLSSTPSA LGKLQDVVNH NAQALNTLVK Q LSSKFGAI SSVLNDILSR LDPPEAEVQI DRLITGRLQS LQTYVTQQLI RAAEIRASAN LAATKMSECV LGQSKRVDFC GK GYHLMSF PQSAPHGVVF LHVTYVPAQE KNFTTAPAIC HDGKAHFPRE GVFVSNGTHW FVTQRNFYEP QIITTDNTFV SGN CDVVIG IVNNTVYDPL QPELDSFKEE LDKYFKNHTS PDVDLGDISG INASVVNIQK EIDRLNEVAK NLNESLIDLQ ELGK YEQGS GYIPEAPRDG QAYVRKDGEW VLLSTFLGRS LEVLFQGPGG GGGSGGGGSH HHHHH

UniProtKB: Spike glycoprotein, Fibritin

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Macromolecule #2: variable heavy chain of ORB10 Fab

MacromoleculeName: variable heavy chain of ORB10 Fab / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 13.172421 KDa
SequenceString:
QVQLQQSGAE LVRPGSSVKI SCKASGYAFS NYWMNWVKQR PGEGLEWIGQ IYPGDGDTDY NGKFKGRATL TADKSSSTAY MQLSSLTSE DSAVYFCARG DDGYYVYFDY WGQGTTLTVS

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Macromolecule #3: variable light chain of ORB10 Fab

MacromoleculeName: variable light chain of ORB10 Fab / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 11.486725 KDa
SequenceString:
EIVLTQSPAL MAASPGEKVT ITCSVSSSIG SNNLHWYQQK SETSPKPWIY GTSNLASGVP VRFSGSGSGT SYSLTISTME AEDAATYYC QQWSGYPLTF GGGTKLEIK

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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: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeJEOL CRYO ARM 300
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 219826
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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