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- PDB-9ekf: CryoEM structure of H5N1 A/Texas/37/2024 HA bound to Fab 65C6 and... -

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Basic information

Entry
Database: PDB / ID: 9ekf
TitleCryoEM structure of H5N1 A/Texas/37/2024 HA bound to Fab 65C6 and an auto glycan occupying the receptor-binding site
Components
  • Fab 65C6 Heavy Chain
  • Fab 65C6 Light Chain
  • Hemagglutinin
KeywordsVIRAL PROTEIN / H5N1 / antibody / influenza
Biological speciesInfluenza A virus
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.68 Å
AuthorsMorano, N.C. / Shapiro, L. / Kwong, P.D.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
Citation
Journal: Structure / Year: 2025
Title: Structure of a zoonotic H5N1 hemagglutinin reveals a receptor-binding site occupied by an auto-glycan.
Authors: Nicholas C Morano / Yicheng Guo / Jordan E Becker / Zhiteng Li / Jian Yu / David D Ho / Lawrence Shapiro / Peter D Kwong /
Abstract: Highly pathogenic avian influenza has spilled into many mammals, most notably cows and poultry, with several dozen human breakthrough infections. Zoonotic crossovers, with hemagglutinins mutated to ...Highly pathogenic avian influenza has spilled into many mammals, most notably cows and poultry, with several dozen human breakthrough infections. Zoonotic crossovers, with hemagglutinins mutated to enhance viral ability to use human α2-6-linked sialic acid receptors versus avian α2-3-linked ones, highlight the pandemic risk. To gain insight into these crossovers, we determined the cryoelectron microscopy (cryo-EM) structure of the hemagglutinin from the zoonotic H5N1 A/Texas/37/2024 strain (clade 2.3.4.4b) in complex with a previously reported neutralizing antibody. Surprisingly, we found that the receptor-binding site of this H5N1 hemagglutinin was already occupied by an α2-3-linked sialic acid and that this glycan emanated from asparagine N169 of a neighboring protomer on hemagglutinin itself. This structure thus highlights recognition by influenza hemagglutinin of an "auto"-α2-3-linked sialic acid from N169, an N-linked glycan conserved in 95% of H5 strains, and adds "auto-glycan recognition," which may play a role in viral dispersal, to the complexities surrounding H5N1 zoonosis.
#1: Journal: Biorxiv / Year: 2024
Title: Structure of a zoonotic H5N1 hemagglutinin reveals a receptor-binding site occupied by an auto-glycan
Authors: Morano, N.C. / Guo, Y. / Becker, J.E. / Li, Z. / Yu, J. / Ho, D.D. / Shapiro, L. / Kwong, P.D.
History
DepositionDec 2, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 18, 2024Provider: repository / Type: Initial release
Revision 1.1Feb 12, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin / Item: _em_admin.last_update
Revision 1.2Feb 19, 2025Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Hemagglutinin
B: Hemagglutinin
C: Hemagglutinin
D: Fab 65C6 Heavy Chain
G: Fab 65C6 Heavy Chain
H: Fab 65C6 Heavy Chain
I: Fab 65C6 Light Chain
K: Fab 65C6 Light Chain
L: Fab 65C6 Light Chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)351,01424
Polymers344,1449
Non-polymers6,87015
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 Hemagglutinin


Mass: 65585.750 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza A virus / Production host: Homo sapiens (human)
#2: Antibody Fab 65C6 Heavy Chain


Mass: 25716.766 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#3: Antibody Fab 65C6 Light Chain


Mass: 23412.010 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#4: Polysaccharide N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D- ...N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1405.271 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DNeup5Aca2-3DGalpb1-4DGlcpNAcb1-2DManpa1-3DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/5,7,6/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5][a2112h-1b_1-5][Aad21122h-2a_2-6_5*NCC/3=O]/1-1-2-3-1-4-5/a4-b1_b4-c1_c3-d1_d2-e1_e4-f1_f3-g2WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{[(4+1)][b-D-Galp]{[(3+2)][a-D-Neup5Ac]{}}}}}}}LINUCSPDB-CARE
#5: 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.: 12 / 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: Complex of Hemagglutinin from H5N1 HA A/Texas/37/2024 with antibody
Type: COMPLEX / Entity ID: #1-#3 / Source: NATURAL
Molecular weightValue: .360 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 58 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: cryoSPARC / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.68 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 206541 / Symmetry type: POINT

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