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- EMDB-65168: Cryo-EM structure of SARS-CoV-2 XBB.1.5 S trimer in the early fus... -

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Entry
Database: EMDB / ID: EMD-65168
TitleCryo-EM structure of SARS-CoV-2 XBB.1.5 S trimer in the early fusion intermediate conformation (E-FIC) complexed with ACE2 and 76E1-Fab
Map data
Sample
  • Complex: the XBB.1.5 E-FIC-76E1 structure
    • Protein or peptide: Spike glycoprotein
    • Protein or peptide: Angiotensin-converting enzyme 2
    • Protein or peptide: heavy chain of 76E1 Fab
    • Protein or peptide: light chain of 76E1 Fab
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
KeywordsSpike / ACE2 / and 76E1-Fab complex / VIRAL PROTEIN / HYDROLASE / VIRAL PROTEIN-HYDROLASE complex
Function / homology
Function and homology information


positive regulation of amino acid transport / angiotensin-converting enzyme 2 / positive regulation of L-proline import across plasma membrane / Hydrolases; Acting on peptide bonds (peptidases); Metallocarboxypeptidases / angiotensin-mediated drinking behavior / positive regulation of gap junction assembly / tryptophan transport / regulation of systemic arterial blood pressure by renin-angiotensin / maternal process involved in female pregnancy / regulation of cardiac conduction ...positive regulation of amino acid transport / angiotensin-converting enzyme 2 / positive regulation of L-proline import across plasma membrane / Hydrolases; Acting on peptide bonds (peptidases); Metallocarboxypeptidases / angiotensin-mediated drinking behavior / positive regulation of gap junction assembly / tryptophan transport / regulation of systemic arterial blood pressure by renin-angiotensin / maternal process involved in female pregnancy / regulation of cardiac conduction / peptidyl-dipeptidase activity / regulation of vasoconstriction / transporter activator activity / Metabolism of Angiotensinogen to Angiotensins / carboxypeptidase activity / angiotensin maturation / viral life cycle / receptor-mediated endocytosis of virus by host cell / Attachment and Entry / metallocarboxypeptidase activity / positive regulation of cardiac muscle contraction / regulation of cytokine production / blood vessel diameter maintenance / negative regulation of smooth muscle cell proliferation / brush border membrane / negative regulation of ERK1 and ERK2 cascade / positive regulation of reactive oxygen species metabolic process / metallopeptidase activity / endocytic vesicle membrane / regulation of cell population proliferation / virus receptor activity / regulation of inflammatory response / symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / endopeptidase activity / host cell surface / host extracellular region / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / Potential therapeutics for SARS / positive regulation of viral entry into host cell / membrane fusion / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / Attachment and Entry / entry receptor-mediated virion attachment to host cell / receptor-mediated virion attachment to host cell / apical plasma membrane / host cell surface receptor binding / symbiont-mediated suppression of host innate immune response / cilium / endocytosis involved in viral entry into host cell / membrane raft / endoplasmic reticulum lumen / receptor ligand activity / 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 / host cell plasma membrane / SARS-CoV-2 activates/modulates innate and adaptive immune responses / virion membrane / cell surface / negative regulation of transcription by RNA polymerase II / : / extracellular exosome / extracellular region / zinc ion binding / membrane / identical protein binding / plasma membrane
Similarity search - Function
Collectrin domain / Renal amino acid transporter / Collectrin-like domain profile. / Peptidase M2, peptidyl-dipeptidase A / Angiotensin-converting enzyme / Peptidase family M2 domain profile. / Neutral zinc metallopeptidases, zinc-binding region signature. / 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 ...Collectrin domain / Renal amino acid transporter / Collectrin-like domain profile. / Peptidase M2, peptidyl-dipeptidase A / Angiotensin-converting enzyme / Peptidase family M2 domain profile. / Neutral zinc metallopeptidases, zinc-binding region signature. / 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, N-terminal domain superfamily / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus / Spike glycoprotein, betacoronavirus / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Spike glycoprotein S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Betacoronavirus spike glycoprotein S1, receptor binding / Spike glycoprotein S2 superfamily, coronavirus / 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, coronavirus / Coronavirus spike glycoprotein S2
Similarity search - Domain/homology
Spike glycoprotein / Angiotensin-converting enzyme 2
Similarity search - Component
Biological speciesSevere acute respiratory syndrome coronavirus 2 / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 5.65 Å
AuthorsLiu ZM / Bao ZH / Sun XY / Sun L
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32100751, 92469108 China
CitationJournal: Nature / Year: 2026
Title: Steric hindrance of antibody binding in an Omicron spike fusion intermediate.
Authors: Zhiheng Bao / Zhimin Liu / Zhaoyong Zhang / Xuanjia Wang / Xiaohui Jin / Jiaxiu Bai / Hanwen Ma / Yaxin Li / Chunyan Yi / Zhiyang Ling / Zhong Huang / Lu Zhang / Zhenguo Chen / Youhua Xie / ...Authors: Zhiheng Bao / Zhimin Liu / Zhaoyong Zhang / Xuanjia Wang / Xiaohui Jin / Jiaxiu Bai / Hanwen Ma / Yaxin Li / Chunyan Yi / Zhiyang Ling / Zhong Huang / Lu Zhang / Zhenguo Chen / Youhua Xie / Yanqun Wang / Lei Sun / Xiaoyu Sun /
Abstract: Understanding conformational changes of the coronavirus spike protein is critical for developing broad-spectrum therapies. The pan-coronavirus epitope spike residues 815-825 (centred on the S2' site) ...Understanding conformational changes of the coronavirus spike protein is critical for developing broad-spectrum therapies. The pan-coronavirus epitope spike residues 815-825 (centred on the S2' site) are buried in the prefusion spike but are transiently exposed upon ACE2 binding. Here, using integrated functional and structural analyses, we demonstrate that 76E1, an antibody targeting spike residues 815-825, specifically recognizes an open early fusion intermediate conformation in which this epitope adopts a helical conformation, designated the S2'-helix. SARS-CoV-2 Omicron variants evade such antibodies via steric hindrance resulting from S2'-helix shifts and restricted S1-ACE2 distancing in the early fusion intermediate conformation, together with increased reliance on cathepsin-mediated entry that impairs 76E1 inhibition of S2' cleavage. The H655Y mutation is central to this evasion. Antibody size directly affects its access to the S2'-helix. Crucially, antibody size minimization reversed the evasion mechanisms and significantly enhanced neutralizing activity against authentic Omicron variants and other human coronaviruses, including SARS-CoV-1 and HCoV-229E. These findings establish small-molecule targeting of the S2'-helix as a strategy for pan-coronavirus therapies.
History
DepositionJun 26, 2025-
Header (metadata) releaseApr 22, 2026-
Map releaseApr 22, 2026-
UpdateMay 20, 2026-
Current statusMay 20, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_65168.png

Downloads & links

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Map

FileDownload / File: emd_65168.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

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AxesZ (Sec.)Y (Row.)X (Col.)
0.93 Å/pix.
x 400 pix.
= 372.8 Å		0.93 Å/pix.
x 400 pix.
= 372.8 Å		0.93 Å/pix.
x 400 pix.
= 372.8 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.932 Å
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Contour LevelBy AUTHOR: 0.09
Minimum - Maximum-0.722107 - 1.4324412
Average (Standard dev.)0.0025500886 (±0.032417115)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 372.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_65168_additional_1.map
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Half map: #2

Fileemd_65168_half_map_1.map
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Half map: #1

Fileemd_65168_half_map_2.map
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Sample components

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Entire : the XBB.1.5 E-FIC-76E1 structure

EntireName: the XBB.1.5 E-FIC-76E1 structure
Components
  • Complex: the XBB.1.5 E-FIC-76E1 structure
    • Protein or peptide: Spike glycoprotein
    • Protein or peptide: Angiotensin-converting enzyme 2
    • Protein or peptide: heavy chain of 76E1 Fab
    • Protein or peptide: light chain of 76E1 Fab
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: the XBB.1.5 E-FIC-76E1 structure

SupramoleculeName: the XBB.1.5 E-FIC-76E1 structure / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2

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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 / Strain: XBB.1.5, Omicron
Molecular weightTheoretical: 142.39275 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MFVFLVLLPL VSSQCVNLIT RTQSYTNSFT RGVYYPDKVF RSSVLHSTQD LFLPFFSNVT WFHAIHVSGT NGTKRFDNPA LPFNDGVYF ASTEKSNIIR GWIFGTTLDS KTQSLLIVNN ATNVVIKVCE FQFCNDPFLD VYQKNNKSWM ESEFRVYSSA N NCTFEYVS ...String:
MFVFLVLLPL VSSQCVNLIT RTQSYTNSFT RGVYYPDKVF RSSVLHSTQD LFLPFFSNVT WFHAIHVSGT NGTKRFDNPA LPFNDGVYF ASTEKSNIIR GWIFGTTLDS KTQSLLIVNN ATNVVIKVCE FQFCNDPFLD VYQKNNKSWM ESEFRVYSSA N NCTFEYVS QPFLMDLEGK EGNFKNLREF VFKNIDGYFK IYSKHTPINL ERDLPQGFSA LEPLVDLPIG INITRFQTLL AL HRSYLTP VDSSSGWTAG AAAYYVGYLQ PRTFLLKYNE NGTITDAVDC ALDPLSETKC TLKSFTVEKG IYQTSNFRVQ PTE SIVRFP NITNLCPFHE VFNATTFASV YAWNRKRISN CVADYSVIYN FAPFFAFKCY GVSPTKLNDL CFTNVYADSF VIRG NEVSQ IAPGQTGNIA DYNYKLPDDF TGCVIAWNSN KLDSKPSGNY NYLYRLFRKS KLKPFERDIS TEIYQAGNKP CNGVA GPNC YSPLQSYGFR PTYGVGHQPY RVVVLSFELL HAPATVCGPK KSTNLVKNKC VNFNFNGLTG TGVLTESNKK FLPFQQ FGR DIADTTDAVR DPQTLEILDI TPCSFGGVSV ITPGTNTSNQ VAVLYQGVNC TEVPVAIHAD QLTPTWRVYS TGSNVFQ TR AGCLIGAEYV NNSYECDIPI GAGICASYQT QTKSHRRARS VASQSIIAYT MSLGAENSVA YSNNSIAIPT NFTISVTT E ILPVSMTKTS VDCTMYICGD STECSNLLLQ YGSFCTQLKR ALTGIAVEQD KNTQEVFAQV KQIYKTPPIK YFGGFNFSQ ILPDPSKPSK RSFIEDLLFN KVTLADAGFI KQYGDCLGDI AARDLICAQK FNGLTVLPPL LTDEMIAQYT SALLAGTITS GWTFGAGAA LQIPFAMQMA YRFNGIGVTQ NVLYENQKLI ANQFNSAIGK IQDSLSSTAS ALGKLQDVVN HNAQALNTLV K QLSSKFGA ISSVLNDILS RLDKVEAEVQ IDRLITGRLQ SLQTYVTQQL IRAAEIRASA NLAATKMSEC VLGQSKRVDF CG KGYHLMS FPQSAPHGVV FLHVTYVPAQ EKNFTTAPAI CHDGKAHFPR EGVFVSNGTH WFVTQRNFYE PQIITTDNTF VSG NCDVVI GIVNNTVYDP LQPELDSFKE ELDKYFKNHT SPDVDLGDIS GINASVVNIQ KEIDRLNEVA KNLNESLIDL QELG KYEQG SGYIPEAPRD GQAYVRKDGE WVFLSTFLSG LEVLFQGPGG WSHPQFEKGG GSGGGSGGSA WSHPQFEKGG SHHHH HHHH

UniProtKB: Spike glycoprotein

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Macromolecule #2: Angiotensin-converting enzyme 2

MacromoleculeName: Angiotensin-converting enzyme 2 / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO / EC number: angiotensin-converting enzyme 2
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 72.989047 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSSSSWLLLS LVAVTAAQST IEEQAKTFLD KFNHEAEDLF YQSSLASWNY NTNITEENVQ NMNNAGDKWS AFLKEQSTLA QMYPLQEIQ NLTVKLQLQA LQQNGSSVLS EDKSKRLNTI LNTMSTIYST GKVCNPDNPQ ECLLLEPGLN EIMANSLDYN E RLWAWESW ...String:
MSSSSWLLLS LVAVTAAQST IEEQAKTFLD KFNHEAEDLF YQSSLASWNY NTNITEENVQ NMNNAGDKWS AFLKEQSTLA QMYPLQEIQ NLTVKLQLQA LQQNGSSVLS EDKSKRLNTI LNTMSTIYST GKVCNPDNPQ ECLLLEPGLN EIMANSLDYN E RLWAWESW RSEVGKQLRP LYEEYVVLKN EMARANHYED YGDYWRGDYE VNGVDGYDYS RGQLIEDVEH TFEEIKPLYE HL HAYVRAK LMNAYPSYIS PIGCLPAHLL GDMWGRFWTN LYSLTVPFGQ KPNIDVTDAM VDQAWDAQRI FKEAEKFFVS VGL PNMTQG FWENSMLTDP GNVQKAVCHP TAWDLGKGDF RILMCTKVTM DDFLTAHHEM GHIQYDMAYA AQPFLLRNGA NEGF HEAVG EIMSLSAATP KHLKSIGLLS PDFQEDNETE INFLLKQALT IVGTLPFTYM LEKWRWMVFK GEIPKDQWMK KWWEM KREI VGVVEPVPHD ETYCDPASLF HVSNDYSFIR YYTRTLYQFQ FQEALCQAAK HEGPLHKCDI SNSTEAGQKL FNMLRL GKS EPWTLALENV VGAKNMNVRP LLNYFEPLFT WLKDQNKNSF VGWSTDWSPY ADLEVLFQGP HHHHHHHH

UniProtKB: Angiotensin-converting enzyme 2

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Macromolecule #3: heavy chain of 76E1 Fab

MacromoleculeName: heavy chain of 76E1 Fab / type: protein_or_peptide / ID: 3 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 23.378164 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EVQLVESGGG VVQPGGSLRL SCEASGFSFK DYGMHWIRQT PGKGLEWISR ISGDTRGTSY VDSVKGRFIV SRDNSRNSLF LQMNSLRSE DTALYYCAAL VIVAAGDDFD LWGQGTVVTV SSASTKGPSV FPLAPSSKST SGGTAALGCL VKDYFPEPVT V SWNSGALT ...String:
EVQLVESGGG VVQPGGSLRL SCEASGFSFK DYGMHWIRQT PGKGLEWISR ISGDTRGTSY VDSVKGRFIV SRDNSRNSLF LQMNSLRSE DTALYYCAAL VIVAAGDDFD LWGQGTVVTV SSASTKGPSV FPLAPSSKST SGGTAALGCL VKDYFPEPVT V SWNSGALT SGVHTFPAVL QSSGLYSLSS VVTVPSSSLG TQTYICNVNH KPSNTKVDKK VEP

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Macromolecule #4: light chain of 76E1 Fab

MacromoleculeName: light chain of 76E1 Fab / type: protein_or_peptide / ID: 4 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 22.949475 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: QSALTQPLSV SGSPGQSVTI SCTGSSSDIG SYNFVSWYRQ YPGKAPKVMI YEVNKRPSGV PVRFSGSKSG NTASLTVSGL QHEDEADYY CCSYGGRNNL IFGGGTKLTV LGQPKAAPSV TLFPPSSEEL QANKATLVCL ISDFYPGAVT VAWKADSSPV K AGVETTTP ...String:
QSALTQPLSV SGSPGQSVTI SCTGSSSDIG SYNFVSWYRQ YPGKAPKVMI YEVNKRPSGV PVRFSGSKSG NTASLTVSGL QHEDEADYY CCSYGGRNNL IFGGGTKLTV LGQPKAAPSV TLFPPSSEEL QANKATLVCL ISDFYPGAVT VAWKADSSPV K AGVETTTP SKQSNNKYAA SSYLSLTPEQ WKSHRSYSCQ VTHEGSTVEK TVAPTECS

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Macromolecule #6: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 6 / Number of copies: 33 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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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 / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionApplied symmetry - Point group: C3 (3 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 5.65 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 93565
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: PROJECTION MATCHING

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