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- EMDB-62786: Cryo-EM structure of SARS-CoV-2 BA.2.75 Spike Protein complex wit... -

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Entry
Database: EMDB / ID: EMD-62786
TitleCryo-EM structure of SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spectrum macrocyclic peptide inhibitor 6L3-3P11K
Map data
Sample
  • Complex: SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spectrum macrocyclic peptide inhibitor 6L3-3P11K
    • Protein or peptide: Spike glycoprotein
  • Protein or peptide: TYR-ASP-PRO-28J-LEU-THR-PRO-LEU-GLY-PHE-LYS-CCS-GLY-NH2
KeywordsComplex / Inhibitor / VIRAL PROTEIN
Function / homology
Function and homology information


symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / membrane fusion ...symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / membrane fusion / Attachment and Entry / entry receptor-mediated virion attachment to host cell / 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 / endocytosis involved in viral entry into host cell / 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 / 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 / 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 ...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
Biological speciesSevere acute respiratory syndrome coronavirus 2 / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsWang M / Yang JY / Peng Q / Shi Y
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32192452 China
CitationJournal: Nat Commun / Year: 2026
Title: Intranasal administration of broad-spectrum macrocyclic peptide inhibitor protects against SARS-CoV-2 Omicron variants.
Authors: Min Wang / Jinyue Yang / Yahong Tan / Shuofeng Yuan / Guoli Shi / Qi Peng / Yongqi Li / Vincent Kwok-Man Poon / Chris Chung-Sing Chan / Na Xiao / Anna Jinxia Zhang / Yubin Xie / Junhua Li / ...Authors: Min Wang / Jinyue Yang / Yahong Tan / Shuofeng Yuan / Guoli Shi / Qi Peng / Yongqi Li / Vincent Kwok-Man Poon / Chris Chung-Sing Chan / Na Xiao / Anna Jinxia Zhang / Yubin Xie / Junhua Li / Hao Luo / Yaning Fu / Yong Chen / Alex A Compton / Youming Zhang / Yang Yang / George Fu Gao / Hongwei Hou / Jasper Fuk-Woo Chan / Yizhen Yin / Yi Shi /
Abstract: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to cause significant morbidity and mortality despite the end of its pandemic phase. The emergence of highly mutated SARS-CoV-2 ...Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to cause significant morbidity and mortality despite the end of its pandemic phase. The emergence of highly mutated SARS-CoV-2 variants of concern highlights the requirement of broad-spectrum antiviral countermeasures which possess both prophylactic and therapeutic efficacies. Here, we obtain a macrocyclic peptide, 6L3-3P11K, that effectively inhibits a wide range of SARS-CoV-2 variants and subvariants. Structural studies show that 6L3-3P11K forms homotrimers that lock the spike protein (S) trimer into a "closed" conformation by engaging a conserved non-receptor binding motif (non-RBM) of S. This interaction disrupts the binding between S and ACE2 receptor. Structure-guided modifications result in a thermostable and trypsin-resistant macrocyclic peptide, 6L3-1F3P11hR, that exhibits prophylactic and therapeutic effects against SARS-CoV-2 infection in a male hACE2 transgenic mouse model after intranasal administration. Our results provide a drug candidate for the control and prevention of COVID-19 and may stimulate further research on macrocyclic broad-spectrum anti-coronavirus drug development.
History
DepositionDec 18, 2024-
Header (metadata) releaseMar 11, 2026-
Map releaseMar 11, 2026-
UpdateMar 11, 2026-
Current statusMar 11, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_62786.png

Downloads & links

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Map

FileDownload / File: emd_62786.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.71 Å/pix.
x 480 pix.
= 340.8 Å		0.71 Å/pix.
x 480 pix.
= 340.8 Å		0.71 Å/pix.
x 480 pix.
= 340.8 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.71 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.01
Minimum - Maximum-0.0016326655 - 1.7194821
Average (Standard dev.)0.001675194 (±0.030313438)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions480480480
Spacing480480480
CellA=B=C: 340.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_62786_half_map_1.map
Projections & Slices
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Half map: #1

Fileemd_62786_half_map_2.map
Projections & Slices
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Sample components

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Entire : SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spec...

EntireName: SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spectrum macrocyclic peptide inhibitor 6L3-3P11K
Components
  • Complex: SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spectrum macrocyclic peptide inhibitor 6L3-3P11K
    • Protein or peptide: Spike glycoprotein
  • Protein or peptide: TYR-ASP-PRO-28J-LEU-THR-PRO-LEU-GLY-PHE-LYS-CCS-GLY-NH2

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Supramolecule #1: SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spec...

SupramoleculeName: SARS-CoV-2 BA.2.75 Spike Protein complex with a potent broad-spectrum macrocyclic peptide inhibitor 6L3-3P11K
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
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 / Details: SARS-CoV-2 spike protein / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 124.230961 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: TQSYTNSFTR GVYYPDKVFR SSVLHSTQDL FLPFFSNVTW FHAIHVSGTN GTKRFDNPVL PFNDGVYFAS TEKSNGIRGW IFGTTLDSK TQSLLIVNNA TNVVIKVCEF QFCNDPFLGV YYHKNNKSWM ESEFRVYSSA NNCTFEYVSQ PFLMDLEGKQ G NFKNLREF ...String:
TQSYTNSFTR GVYYPDKVFR SSVLHSTQDL FLPFFSNVTW FHAIHVSGTN GTKRFDNPVL PFNDGVYFAS TEKSNGIRGW IFGTTLDSK TQSLLIVNNA TNVVIKVCEF QFCNDPFLGV YYHKNNKSWM ESEFRVYSSA NNCTFEYVSQ PFLMDLEGKQ G NFKNLREF VFKNIDGYFK IYSKHTPVNL GRDLPQGFSA LEPLVDLPIG INITRFQTLL ALHRSYLTPG DSSSGWTAGA AA YYVGYLQ PRTFLLKYNE NGTITDAVDC ALDPLSETKC TLKSFTVEKG IYQTSNFRVQ PTESIVRFPN ITNLCPFHEV FNA TRFASV YAWNRKRISN CVADYSVLYN FAPFFAFKCY GVSPTKLNDL CFTNVYADSF VIRGNEVSQI APGQTGNIAD YNYK LPDDF TGCVIAWNSN KLDSKVSGNY NYLYRLFRKS KLKPFERDIS TEIYQAGNKP CNGVAGFNCY FPLQSYGFRP TYGVG HQPY RVVVLSFELL HAPATVCGPK KSTNLVKNKC VNFNFNGLTG TGVLTESNKK FLPFQQFGRD IADTTDAVRD PQTLEI LDI TPCSFGGVSV ITPGTNTSNQ VAVLYQGVNC TEVPVAIHAD QLTPTWRVYS TGSNVFQTRA GCLIGAEYVN NSYECDI PI GAGICASYQT QTNSPRRARS VASQSIIAYT MSLGAENSVA YSNNSIAIPT NFTISVTTEI LPVSMTKTSV DCTMYICG D STECSNLLLQ YGSFCTQLKR ALTGIAVEQD KNTQEVFAQV KQIYKTPPIK YFGGFNFSQI LPDPSKPSKR SPIEDLLFN KVTLADAGFI KQYGDCLGDI AARDLICAQK FNGLTVLPPL LTDEMIAQYT SALLAGTITS GWTFGAGPAL QIPFPMQMAY RFNGIGVTQ NVLYENQKLI ANQFNSAIGK IQDSLSSTPS ALGKLQDVVN HNAQALNTLV KQLSSKFGAI SSVLNDILSR L DPPEAEVQ IDRLITGRLQ SLQTYVTQQL IRAAEIRASA NLAATKMSEC VLGQSKRVDF CGKGYHLMSF PQSAPHGVVF LH VTYVPAQ EKNFTTAPAI CHDGKAHFPR EGVFVSNGTH WFVTQRNFYE PQIITTDNTF VSGNCDVVIG IVNNTVYDPL QPE

UniProtKB: Spike glycoprotein

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Macromolecule #2: TYR-ASP-PRO-28J-LEU-THR-PRO-LEU-GLY-PHE-LYS-CCS-GLY-NH2

MacromoleculeName: TYR-ASP-PRO-28J-LEU-THR-PRO-LEU-GLY-PHE-LYS-CCS-GLY-NH2
type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 1.480727 KDa
SequenceString:
YDP(28J)LTPLGF K(CCS)G(NH2)

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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
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.6 µm / Nominal defocus min: 1.5 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 reconstructionResolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 224700
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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