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- PDB-8z7l: Cryo-EM structure of SARS-CoV-2 S trimer in the early fusion inte... -

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Basic information

Entry
Database: PDB / ID: 8z7l
TitleCryo-EM structure of SARS-CoV-2 S trimer in the early fusion intermediate conformation (E-FIC) (focused refinement of S-bottom)
ComponentsSpike glycoprotein
KeywordsVIRAL PROTEIN / Spike-ACE2 complex
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 / viral translation / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion ...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 / membrane fusion / entry receptor-mediated virion attachment to host cell / 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
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. / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus ...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. / 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 S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / 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
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.42 Å
AuthorsLiu, Z. / Xing, L.
Funding support China, 7items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2021YFC2302500 China
National Natural Science Foundation of China (NSFC)82394463; 92169112; 82341036 China
National Key R&D Program of China2022YFC2604100; 2021YFC2300703; 2023YFC2307800 China
Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences2023-PT310-02 China
Major Project of Guangzhou National LaboratoryGZNL2023A01008; GZNL2024A01008 China
R&D Program of Guangzhou LaboratorySRPG22-003 China
Shanghai Municipal Science and Technology Major ProjectZD2021CY001 China
CitationJournal: Cell / Year: 2025
Title: Early fusion intermediate of ACE2-using coronavirus spike acting as an antiviral target.
Authors: Lixiao Xing / Zhimin Liu / Xinling Wang / Qianying Liu / Wei Xu / Qiyu Mao / Xiang Zhang / Aihua Hao / Shuai Xia / Zezhong Liu / Lujia Sun / Guangxu Zhang / Qian Wang / Zhenguo Chen / Shibo ...Authors: Lixiao Xing / Zhimin Liu / Xinling Wang / Qianying Liu / Wei Xu / Qiyu Mao / Xiang Zhang / Aihua Hao / Shuai Xia / Zezhong Liu / Lujia Sun / Guangxu Zhang / Qian Wang / Zhenguo Chen / Shibo Jiang / Lei Sun / Lu Lu /
Abstract: Coronavirus fusion with and entry into the host cell depends on viral spike, which acts as a crucial component of viral infection. However, the lack of receptor-activated spike intermediate ...Coronavirus fusion with and entry into the host cell depends on viral spike, which acts as a crucial component of viral infection. However, the lack of receptor-activated spike intermediate conformation has hindered a comprehensive understanding of spike-induced membrane fusion. Here, we captured an angiotensin-converting enzyme 2 (ACE2)-induced early fusion intermediate conformation (E-FIC) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike in which heptad repeat 1 (HR1) in S2 has ejected while S1 remains attached. This E-FIC can transition to the late FIC after S2' cleavage. Leveraging this discovery, we designed an E-FIC-targeted dual-functional antiviral protein, AL5E. AL5E effectively inactivated ACE2-using coronaviruses and inhibited their infection, outperforming a mono-functional antiviral in protecting animals against these coronaviruses. This study has identified the E-FIC and used it as a target for the development of a dual-functional antiviral for the prevention and treatment of ACE2-using coronavirus infection.
History
DepositionApr 20, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Feb 5, 2025Provider: repository / Type: Initial release
Revision 1.0Feb 5, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 5, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 5, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 5, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 5, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jul 23, 2025Group: Data collection / Database references
Category: citation / citation_author ...citation / citation_author / em_admin / em_software
Item: _citation.journal_abbrev / _citation.journal_id_CSD ..._citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Spike glycoprotein
B: Spike glycoprotein
C: Spike glycoprotein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)430,20712
Polymers427,6073
Non-polymers2,6009
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Spike glycoprotein / S glycoprotein / E2 / Peplomer protein


Mass: 142535.641 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Severe acute respiratory syndrome coronavirus 2
Gene: S, 2 / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: P0DTC2
#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#3: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: SARS-CoV-2 S trimer in the early fusion intermediate conformation (E-FIC) (focused on S-bottom)
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 3.42 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 97415 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0016909
ELECTRON MICROSCOPYf_angle_d0.3779381
ELECTRON MICROSCOPYf_dihedral_angle_d21.6372466
ELECTRON MICROSCOPYf_chiral_restr0.0411122
ELECTRON MICROSCOPYf_plane_restr0.0041185

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