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- PDB-8iux: The cryoEM structure of H7N9-HA protein -

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Basic information

Entry
Database: PDB / ID: 8iux
TitleThe cryoEM structure of H7N9-HA protein
ComponentsHemagglutinin
KeywordsMEMBRANE PROTEIN / H7N9 / HA / Trimer / complex
Function / homology
Function and homology information


viral budding from plasma membrane / clathrin-dependent endocytosis of virus by host cell / host cell surface receptor binding / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane / virion membrane / membrane
Similarity search - Function
Haemagglutinin, influenzavirus A / Haemagglutinin, HA1 chain, alpha/beta domain superfamily / Haemagglutinin / Haemagglutinin, influenzavirus A/B / Viral capsid/haemagglutinin protein
Similarity search - Domain/homology
Biological speciesH7N9 subtype (virus)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsZhao, B.B. / Sun, Z.Z.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32272980 China
CitationJournal: J Virol / Year: 2025
Title: Structural basis of different neutralization capabilities of monoclonal antibodies against H7N9 virus.
Authors: Bingbing Zhao / Zhenzhao Sun / Shida Wang / Zhibin Shi / Yongping Jiang / Xiurong Wang / Guohua Deng / Peirong Jiao / Hualan Chen / Jingfei Wang /
Abstract: Neutralizing antibodies (nAbs) are important for the treatment of emerging viral diseases and for effective vaccine development. In this study, we generated and evaluated three nAbs (1H9, 2D7, and ...Neutralizing antibodies (nAbs) are important for the treatment of emerging viral diseases and for effective vaccine development. In this study, we generated and evaluated three nAbs (1H9, 2D7, and C4H4) against H7N9 influenza viruses and found that they differ in their ability to inhibit viral attachment, membrane fusion, and egress. We resolved the cryo-electron microscopy (cryo-EM) structures of H7N9 hemagglutinin (HA) alone and in complex with the nAb antigen-binding fragments (Fabs) and identified the HA head-located epitope for each nAb, thereby revealing the molecular basis and key residues that determine the differences in these nAbs in neutralizing H7N9 viruses. Moreover, we found that the humanized nAb CC4H4 provided complete protection in mice against death caused by a lethal H7N9 virus infection, even when nAb was given 3 days after the mice were infected. These findings provide new insights into the neutralizing mechanism and structural basis for the rational design of H7N9 virus vaccines and therapeutics.IMPORTANCEH7N9 viruses have caused severe infections in both birds and humans since their emergence in early 2013 in China. Their persistent presence and variation in avian populations pose a significant threat to both poultry and humans. There are no treatments for human infections. In this study, we thoroughly investigated the neutralization mechanisms, structural basis, and therapeutic effects of three nAbs (1H9, 2D7, and C4H4) against H7N9 viruses. We revealed the molecular determinants underlying the varied performances of the three nAbs in neutralizing H7N9 viruses and protecting H7N9-infected mice. These insights provide a solid foundation for the rational design of vaccines and therapeutics against H7N9 viruses.
History
DepositionMar 25, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 24, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 16, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.2May 7, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _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

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Hemagglutinin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)55,6274
Polymers54,9631
Non-polymers6643
Water00
1
A: Hemagglutinin
hetero molecules

A: Hemagglutinin
hetero molecules

A: Hemagglutinin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)166,88112
Polymers164,8903
Non-polymers1,9919
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation2
2


  • Idetical with deposited unit
  • point asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3


  • Idetical with deposited unit in distinct coordinate
  • point asymmetric unit, std point frame
TypeNameSymmetry operationNumber
transform to point frame1
SymmetryPoint symmetry: (Schoenflies symbol: C3 (3 fold cyclic))

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Components

#1: Protein Hemagglutinin


Mass: 54963.367 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) H7N9 subtype (virus) / Gene: HA / Plasmid: pFastBac 1-H7-HA / Details (production host): gp / Cell line (production host): High five cell / Production host: Baculovirus expression vector pFastBac1-HM / References: UniProt: A0A2D0Z8H0
#2: 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.: 3 / 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: CELL / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: High Five Cell / Type: CELL / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: H7N9 subtype (virus)
Source (recombinant)Organism: Baculovirus expression vector pFastBac1-HM
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: NITROGEN

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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: 1500 nm
Image recordingElectron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 61557 / Symmetry type: POINT

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