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- PDB-7kc1: Cryo-EM structure of SRR2899884.46167H+MEDI8852L fab in complex w... -

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Basic information

Entry
Database: PDB / ID: 7kc1
TitleCryo-EM structure of SRR2899884.46167H+MEDI8852L fab in complex with Victoria HA
Components
  • Fab heavy chainFragment antigen-binding
  • Fab light chainFragment antigen-binding
  • Fusion protein of Hemagglutinin and Envelope glycoprotein
  • Hemagglutinin
KeywordsIMMUNE SYSTEM / Flu / HA / HV6-1 / VRC / IMMUNE SYSTEM-Viral Protein 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 / apical plasma membrane / 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
Similarity search - Function
Haemagglutinin, influenzavirus B / Fibritin C-terminal / Fibritin C-terminal region / Haemagglutinin, influenzavirus A / Haemagglutinin, HA1 chain, alpha/beta domain superfamily / Haemagglutinin / Haemagglutinin, influenzavirus A/B / Viral capsid/haemagglutinin protein
Similarity search - Domain/homology
Hemagglutinin / Hemagglutinin / Envelope glycoprotein
Similarity search - Component
Biological speciesInfluenza A virus
Human immunodeficiency virus 1
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.41 Å
AuthorsGorman, J. / Kwong, P.D.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM103310 United States
Other privateSF349247 United States
Other privateAgouron Institute (F00316) United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)NIH S10 OD019994-01 United States
CitationJournal: Front Immunol / Year: 2021
Title: Sequence-Signature Optimization Enables Improved Identification of Human HV6-1-Derived Class Antibodies That Neutralize Diverse Influenza A Viruses.
Authors: Gwo-Yu Chuang / Chen-Hsiang Shen / Crystal Sao-Fong Cheung / Jason Gorman / Adrian Creanga / M Gordon Joyce / Kwanyee Leung / Reda Rawi / Lingshu Wang / Eun Sung Yang / Yongping Yang / ...Authors: Gwo-Yu Chuang / Chen-Hsiang Shen / Crystal Sao-Fong Cheung / Jason Gorman / Adrian Creanga / M Gordon Joyce / Kwanyee Leung / Reda Rawi / Lingshu Wang / Eun Sung Yang / Yongping Yang / Baoshan Zhang / Yi Zhang / Masaru Kanekiyo / Tongqing Zhou / Brandon J DeKosky / Barney S Graham / John R Mascola / Peter D Kwong /
Abstract: Sequence signatures of multidonor broadly neutralizing influenza antibodies can be used to quantify the prevalence of B cells with virus-neutralizing potential to accelerate development of broadly ...Sequence signatures of multidonor broadly neutralizing influenza antibodies can be used to quantify the prevalence of B cells with virus-neutralizing potential to accelerate development of broadly protective vaccine strategies. Antibodies of the same class share similar recognition modes and developmental pathways, and several antibody classes have been identified that neutralize diverse group 1- and group 2-influenza A viruses and have been observed in multiple human donors. One such multidonor antibody class, the HV6-1-derived class, targets the stem region of hemagglutinin with extraordinary neutralization breadth. Here, we use an iterative process to combine informatics, biochemical, and structural analyses to delineate an improved sequence signature for HV6-1-class antibodies. Based on sequence and structure analyses of known HV6-1 class antibodies, we derived a more inclusive signature (version 1), which we used to search for matching B-cell transcripts from published next-generation sequencing datasets of influenza vaccination studies. We expressed selected antibodies, evaluated their function, and identified amino acid-level requirements from which to refine the sequence signature (version 2). The cryo-electron microscopy structure for one of the signature-identified antibodies in complex with hemagglutinin confirmed motif recognition to be similar to known HV6-1-class members, MEDI8852 and 56.a.09, despite differences in recognition-loop length. Threading indicated the refined signature to have increased accuracy, and signature-identified heavy chains, when paired with the light chain of MEDI8852, showed neutralization comparable to the most potent members of the class. Incorporating sequences of additional class members thus enables an improved sequence signature for HV6-1-class antibodies, which can identify class members with increased accuracy.
History
DepositionOct 4, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 12, 2021Provider: repository / Type: Initial release
Revision 1.1Jul 14, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name

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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
A: Hemagglutinin
B: Fusion protein of Hemagglutinin and Envelope glycoprotein
H: Fab heavy chain
L: Fab light chain
C: Hemagglutinin
D: Fusion protein of Hemagglutinin and Envelope glycoprotein
E: Fab heavy chain
F: Fab light chain
G: Hemagglutinin
I: Fusion protein of Hemagglutinin and Envelope glycoprotein
J: Fab heavy chain
K: Fab light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)344,82939
Polymers331,55312
Non-polymers13,27527
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 6 molecules ACGBDI

#1: Protein Hemagglutinin /


Mass: 38515.629 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza A virus / Gene: HA / Production host: Homo sapiens (human) / References: UniProt: L0HR89
#2: Protein Fusion protein of Hemagglutinin and Envelope glycoprotein /


Mass: 25259.078 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza A virus, (gene. exp.) Human immunodeficiency virus 1
Gene: HA / Production host: Homo sapiens (human) / References: UniProt: A0A2P1E3C0, UniProt: M1E1E4

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Antibody , 2 types, 6 molecules HEJLFK

#3: Antibody Fab heavy chain / Fragment antigen-binding


Mass: 24292.277 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: Antibody Fab light chain / Fragment antigen-binding


Mass: 22450.832 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Sugars , 3 types, 27 molecules

#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)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 910.823 Da / Num. of mol.: 9
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3/a4-b1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}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.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam 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
[][D-1-deoxy-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 / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 15 / 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

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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

Component
IDNameTypeEntity IDParent-IDSource
1Cryo-EM structure of SRR2899884.46167H+MEDI8852L fab in complex with Victoria HACOMPLEX#1-#40RECOMBINANT
2Cryo-EM structure of SRR2899884.46167H+MEDI8852L fab in complex with Victoria HACOMPLEX#1-#41RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Influenza A virus
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
Buffer componentFormula: PBS
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid type: C-flat-1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 293 K

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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 FIELDBright-field microscopy / C2 aperture diameter: 70 µm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10 sec. / Electron dose: 71.06 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 10024
Image scansMovie frames/image: 50

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Processing

SoftwareName: PHENIX / Version: dev_3965: / Classification: refinement
EM software
IDNameVersionCategory
1DoG Pickerparticle selection
2Leginonimage acquisition
4CTFFIND4CTF correction
7Cootmodel fitting
11cryoSPARC2.14classification
12cryoSPARC2.143D reconstruction
19PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.41 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 29735 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 4O5N

4o5n

Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00317814
ELECTRON MICROSCOPYf_angle_d0.53824153
ELECTRON MICROSCOPYf_dihedral_angle_d7.2662826
ELECTRON MICROSCOPYf_chiral_restr0.0472862
ELECTRON MICROSCOPYf_plane_restr0.0043021

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