7U8M

Crystal structure of chimeric hemagglutinin cH15/3 in complex with broad protective antibodies 31.a.83 and FluA-20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.39 Å
  • R-Value Free: 0.342 
  • R-Value Work: 0.304 
  • R-Value Observed: 0.306 

Starting Models: experimental
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Literature

Influenza chimeric hemagglutinin structures in complex with broadly protective antibodies to the stem and trimer interface.

Zhu, X.Han, J.Sun, W.Puente-Massaguer, E.Yu, W.Palese, P.Krammer, F.Ward, A.B.Wilson, I.A.

(2022) Proc Natl Acad Sci U S A 119: e2200821119-e2200821119

  • DOI: https://doi.org/10.1073/pnas.2200821119
  • Primary Citation of Related Structures:  
    7U8J, 7U8L, 7U8M

  • PubMed Abstract: 

    Influenza virus hemagglutinin (HA) has been the primary target for influenza vaccine development. Broadly protective antibodies targeting conserved regions of the HA unlock the possibility of generating universal influenza immunity. Two group 2 influenza A chimeric HAs, cH4/3 and cH15/3, were previously designed to elicit antibodies to the conserved HA stem. Here, we show by X-ray crystallography and negative-stain electron microscopy that a broadly protective antistem antibody can stably bind to cH4/3 and cH15/3 HAs, thereby validating their potential as universal vaccine immunogens. Furthermore, flexibility was observed in the head domain of the chimeric HA structures, suggesting that antibodies could also potentially interact with the head interface epitope. Our structural and binding studies demonstrated that a broadly protective antihead trimeric interface antibody could indeed target the more open head domain of the cH15/3 HA trimer. Thus, in addition to inducing broadly protective antibodies against the conserved HA stem, chimeric HAs may also be able to elicit antibodies against the conserved trimer interface in the HA head domain, thereby increasing the vaccine efficacy.


  • Organizational Affiliation

    Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
hemagglutinin HA1 subunitA,
E [auth C],
I [auth G]
333Influenza A virusMutation(s): 0 
UniProt
Find proteins for A0A385F4V1 (Influenza A virus)
Explore A0A385F4V1 
Go to UniProtKB:  A0A385F4V1
Find proteins for P19696 (Influenza A virus (strain A/Duck/Czechoslovakia/1956 H4N6))
Explore P19696 
Go to UniProtKB:  P19696
Find proteins for A0A0G2YG46 (Influenza A virus)
Explore A0A0G2YG46 
Go to UniProtKB:  A0A0G2YG46
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsA0A0G2YG46A0A385F4V1P19696
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
hemagglutinin HA2 subunitB,
F [auth D],
J [auth I]
176Influenza A virusMutation(s): 0 
Gene Names: HA
UniProt
Find proteins for P12589 (Influenza A virus (strain A/Memphis/6/1986 H3N2))
Explore P12589 
Go to UniProtKB:  P12589
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UniProt GroupP12589
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Antibody 31.a.83 Fab light chainC [auth L],
G [auth E],
K [auth J]
214Homo sapiensMutation(s): 0 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
antibody 31.a.83 Fab heavy chainD [auth H],
H [auth F],
L [auth K]
234Homo sapiensMutation(s): 0 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
antibody FluA-20 Fab heavy chainM [auth N],
O [auth Q],
Q [auth T]
229Homo sapiensMutation(s): 0 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
antibody FluA-20 Fab light chainN [auth O],
P [auth R],
R [auth U]
214Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.39 Å
  • R-Value Free: 0.342 
  • R-Value Work: 0.304 
  • R-Value Observed: 0.306 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 272.922α = 90
b = 155.729β = 94.63
c = 156.893γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States75N93109C00051

Revision History  (Full details and data files)

  • Version 1.0: 2022-06-08
    Type: Initial release
  • Version 1.1: 2023-10-18
    Changes: Data collection, Refinement description