5UMN

Crystal structure of C05 VPGSGW mutant bound to H3 influenza hemagglutinin, HA1 subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

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This is version 1.4 of the entry. See complete history


Literature

In vitro evolution of an influenza broadly neutralizing antibody is modulated by hemagglutinin receptor specificity.

Wu, N.C.Grande, G.Turner, H.L.Ward, A.B.Xie, J.Lerner, R.A.Wilson, I.A.

(2017) Nat Commun 8: 15371-15371

  • DOI: 10.1038/ncomms15371
  • Primary Citation of Related Structures:  
    5UMN

  • PubMed Abstract: 
  • The relatively recent discovery and characterization of human broadly neutralizing antibodies (bnAbs) against influenza virus provide valuable insights into antiviral and vaccine development. However, the factors that influence the evolution of high-affinity bnAbs remain elusive ...

    The relatively recent discovery and characterization of human broadly neutralizing antibodies (bnAbs) against influenza virus provide valuable insights into antiviral and vaccine development. However, the factors that influence the evolution of high-affinity bnAbs remain elusive. We therefore explore the functional sequence space of bnAb C05, which targets the receptor-binding site (RBS) of influenza haemagglutinin (HA) via a long CDR H3. We combine saturation mutagenesis with yeast display to enrich for C05 variants of CDR H3 that bind to H1 and H3 HAs. The C05 variants evolve up to 20-fold higher affinity but increase specificity to each HA subtype used in the selection. Structural analysis reveals that the fine specificity is strongly influenced by a highly conserved substitution that regulates receptor binding in different subtypes. Overall, this study suggests that subtle natural variations in the HA RBS between subtypes and species may differentially influence the evolution of high-affinity bnAbs.


    Organizational Affiliation

    The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California 92037, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HemagglutininA, B274Influenza A virus (A/Hong Kong/1/1968(H3N2))Mutation(s): 0 
Gene Names: HA
UniProt
Find proteins for Q91MA7 (Influenza A virus (strain A/Hong Kong/1/1968 H3N2))
Explore Q91MA7 
Go to UniProtKB:  Q91MA7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ91MA7
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Antibody C05 VPGSGW mutant, heavy chainC, E247Homo sapiensMutation(s): 0 
Entity Groups  
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Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Antibody C05, light chainD, F214Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.344α = 90
b = 88.344β = 90
c = 255.038γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-01-27 
  • Released Date: 2017-05-24 
  • Deposition Author(s): Wu, N.C., Wilson, I.A.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR56 AI117675

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-24
    Type: Initial release
  • Version 1.1: 2017-05-31
    Changes: Database references
  • Version 1.2: 2017-09-06
    Changes: Author supporting evidence
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary