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- PDB-9o4p: Cryo-EM structure of AF9C-GL Fab in complex with influenza virus ... -

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Basic information

Entry
Database: PDB / ID: 9o4p
TitleCryo-EM structure of AF9C-GL Fab in complex with influenza virus neuraminidase from A/California/07/2009 (H1N1)
Components
  • AF9C-GL heavy chain
  • AF9C-GL light chain
  • Neuraminidase
KeywordsVIRAL PROTEIN/IMMUNE SYSTEM / Neuraminidase / Hydrolase / Antibody complex / VIRAL PROTEIN / VIRAL PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


exo-alpha-sialidase / exo-alpha-sialidase activity / viral budding from plasma membrane / carbohydrate metabolic process / host cell plasma membrane / virion membrane / metal ion binding / membrane
Similarity search - Function
Sialidase, Influenza viruses A/B / Glycoside hydrolase, family 34 / Neuraminidase / Sialidase superfamily
Similarity search - Domain/homology
Biological speciesInfluenza A virus
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.55 Å
AuthorsJo, G. / 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: Nat Commun / Year: 2025
Title: Structural basis of broad protection against influenza virus by human antibodies targeting the neuraminidase active site via a recurring motif in CDR H3.
Authors: Gyunghee Jo / Seiya Yamayoshi / Krystal M Ma / Olivia Swanson / Jonathan L Torres / James A Ferguson / Monica L Fernández-Quintero / Jiachen Huang / Jeffrey Copps / Alesandra J Rodriguez / ...Authors: Gyunghee Jo / Seiya Yamayoshi / Krystal M Ma / Olivia Swanson / Jonathan L Torres / James A Ferguson / Monica L Fernández-Quintero / Jiachen Huang / Jeffrey Copps / Alesandra J Rodriguez / Jon M Steichen / Yoshihiro Kawaoka / Julianna Han / Andrew B Ward /
Abstract: Influenza viruses evolve rapidly, driving seasonal epidemics and posing global pandemic threats. While neuraminidase (NA) has emerged as a vaccine target, shared molecular features of NA antibody ...Influenza viruses evolve rapidly, driving seasonal epidemics and posing global pandemic threats. While neuraminidase (NA) has emerged as a vaccine target, shared molecular features of NA antibody responses are still not well understood. Here, we describe cryo-electron microscopy structures of the broadly protective human antibody DA03E17, which was previously identified from an H1N1-infected donor, in complex with NA from A/H1N1, A/H3N2, and B/Victoria-lineage viruses. DA03E17 targets the highly conserved NA active site using its long CDR H3, which features a DR (Asp-Arg) motif that engages catalytic residues and mimics sialic acid interactions. We further demonstrate that this motif is conserved among several NA active site-targeting antibodies, indicating a common receptor mimicry strategy. We also identified BCR sequences containing this DR motif across all donors in a healthy human repertoire database, suggesting that such precursors may be relatively common and have vaccine targeting potential. Our findings reveal shared molecular features in NA active site-targeting antibodies that can be harnessed to design broad, immune-focused influenza vaccines.
History
DepositionApr 8, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 13, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Neuraminidase
B: Neuraminidase
C: Neuraminidase
D: Neuraminidase
E: AF9C-GL heavy chain
F: AF9C-GL heavy chain
G: AF9C-GL heavy chain
H: AF9C-GL heavy chain
I: AF9C-GL light chain
J: AF9C-GL light chain
K: AF9C-GL light chain
L: AF9C-GL light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)320,54933
Polymers312,56612
Non-polymers7,98421
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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Antibody , 2 types, 8 molecules EFGHIJKL

#2: Antibody
AF9C-GL heavy chain


Mass: 13656.194 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#3: Antibody
AF9C-GL light chain


Mass: 11679.009 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Protein / Non-polymers , 2 types, 13 molecules ABCD

#1: Protein
Neuraminidase


Mass: 52806.184 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza A virus (A/California/07/2009(H1N1))
Gene: NA / Production host: Homo sapiens (human) / References: UniProt: C7FH46, exo-alpha-sialidase
#6: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 9 / Source method: obtained synthetically / Formula: Ca

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Sugars , 2 types, 12 molecules

#4: 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.: 8
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
#5: Polysaccharide
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2- ...alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1056.964 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/4,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5][a1221m-1a_1-5]/1-1-2-3-3-4/a4-b1_a6-f1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}[(6+1)][a-L-Fucp]{}}}LINUCSPDB-CARE

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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: Cryo-EM structure of AF9C-GL Fab in complex with influenza virus neuraminidase from A/California/07/2009 (H1N1)
Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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: 1700 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 3.03 sec. / Electron dose: 45 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3142

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2EPUimage acquisition
4cryoSPARCCTF correction
8PHENIXmodel refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 2.55 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 107490 / Symmetry type: POINT
RefinementHighest resolution: 2.55 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00520064
ELECTRON MICROSCOPYf_angle_d0.8327272
ELECTRON MICROSCOPYf_dihedral_angle_d13.387240
ELECTRON MICROSCOPYf_chiral_restr0.0553036
ELECTRON MICROSCOPYf_plane_restr0.023472

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