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- PDB-9p9q: KL-H15-3G11 Fab in complex with soluble A/wedge-tailed shearwater... -

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Basic information

Entry
Database: PDB / ID: 9p9q
TitleKL-H15-3G11 Fab in complex with soluble A/wedge-tailed shearwater/Western Australia/2576/1979 H15 hemagglutinin trimer
Components
  • (Hemagglutinin ...) x 2
  • KL-15-3G11 heavy chain Fv
  • KL-15-3G11 light chain Fv
KeywordsVIRAL PROTEIN/Immune System / influenza virus / hemagglutinin / avian influenza virus / antibody Fab complex / glycoprotein / VIRAL PROTEIN / VIRAL PROTEIN-Immune System 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 speciesInfluenza A virus
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsLeon, A.N. / Ferguson, J.A. / Han, J.H. / Ward, A.B.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)75N93019C00051 United States
CitationJournal: Cell Rep / Year: 2026
Title: Structural and functional characterization of the antigenicity of influenza A virus hemagglutinin subtype H15.
Authors: Disha Bhavsar / André Nicolás León / Wei-Li Hsu / Eduard Puente-Massaguer / James A Ferguson / Julianna Han / Patrick Wilson / Andrew B Ward / Florian Krammer /
Abstract: Avian H15 influenza viruses are closely related to H7 viruses, but only 22 H15 sequences have been reported since 1987, suggesting both rarity and minimal antigenic variation. Here, we characterized ...Avian H15 influenza viruses are closely related to H7 viruses, but only 22 H15 sequences have been reported since 1987, suggesting both rarity and minimal antigenic variation. Here, we characterized a panel of mouse monoclonal antibodies (mAbs) raised against the A/wedge-tailed shearwater/Western Australia/2576/1979 ancestral strain, and a human mAb isolated from an H7N9 vaccinee. We found differences in binding and neutralization profiles against the ancestral strain and drifted strains of H15 isolated after 2008. mAbs exhibiting hemagglutination inhibition activity against the ancestral strain do not show binding to drifted strains, hinting at antigenic differences near the receptor binding site. We show that the mAbs protect in vivo and elucidate mAb-antigen interactions using negative stain and cryo-electron microscopy. The characterization of H15 antigenicity and the mechanisms of antibody-mediated neutralization expands our knowledge of this sparsely sampled avian influenza virus subtype and informs our understanding of immune pressures on viral surface glycoproteins.
History
DepositionJun 24, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 1, 2026Provider: repository / Type: Initial release
Revision 1.0Jul 1, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jul 1, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Revision 1.1Jul 15, 2026Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / EM metadata / Category: citation / citation_author / em_admin
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Hemagglutinin HA2
C: Hemagglutinin HA1
F: Hemagglutinin HA2
H: KL-15-3G11 heavy chain Fv
L: KL-15-3G11 light chain Fv
A: Hemagglutinin HA1
D: Hemagglutinin HA2
E: Hemagglutinin HA1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)192,88522
Polymers188,8138
Non-polymers4,07214
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Hemagglutinin ... , 2 types, 6 molecules BFDCAE

#1: Protein Hemagglutinin HA2


Mass: 19161.992 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza A virus (A/shearwater/West Australia/2576/79(H15N9))
Gene: HA / Production host: Homo sapiens (human) / References: UniProt: Q82566
#2: Protein Hemagglutinin HA1


Mass: 35383.820 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza A virus (A/shearwater/West Australia/2576/79(H15N9))
Gene: HA / Production host: Homo sapiens (human) / References: UniProt: Q82566

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Antibody , 2 types, 2 molecules HL

#3: Antibody KL-15-3G11 heavy chain Fv


Mass: 13068.313 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Mus musculus (house mouse)
#4: Antibody KL-15-3G11 light chain Fv


Mass: 12107.449 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Mus musculus (house mouse)

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Sugars , 3 types, 14 molecules

#5: 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
#6: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#7: 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.: 10 / 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

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Details

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: KL-H15-3G11 Fab in complex with soluble A/wedge-tailed shearwater/Western Australia/2576/1979 H15 hemagglutinin trimer
Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Influenza A virus (A/shearwater/West Australia/2576/79(H15N9))
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 0.65 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 190000 X / Nominal defocus max: 1400 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 46.95 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3345

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.21.2_5419model refinement
3EPUimage acquisition
5cryoSPARCCTF correction
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 47527 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 114.57 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.003613715
ELECTRON MICROSCOPYf_angle_d0.674718549
ELECTRON MICROSCOPYf_chiral_restr0.04562052
ELECTRON MICROSCOPYf_plane_restr0.00412425
ELECTRON MICROSCOPYf_dihedral_angle_d8.35782223

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