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Heterosubtypic antibody recognition of the influenza virus hemagglutinin receptor binding site enhanced by avidity

Academic Article
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Overview

related to degree

  • Lee, Peter S., Ph.D. in Biology, Scripps Research 2009 - 2014
  • Ekiert, Damian, Ph.D. in Chemical Biology, Scripps Research 2006 - 2011

authors

  • Lee, Peter S.
  • Yoshida, R.
  • Ekiert, Damian
  • Sakai, N.
  • Suzuki, Y.
  • Takada, A.
  • Wilson, Ian

publication date

  • October 2012

journal

  • Proceedings of the National Academy of Sciences of the United States of America  Journal

abstract

  • Continual and rapid mutation of seasonal influenza viruses by antigenic drift necessitates the almost annual reformulation of flu vaccines, which may offer little protection if the match to the dominant circulating strain is poor. S139/1 is a cross-reactive antibody that neutralizes multiple HA strains and subtypes, including those from H1N1 and H3N2 viruses that currently infect humans. The crystal structure of the S139/1 Fab in complex with the HA from the A/Victoria/3/1975 (H3N2) virus reveals that the antibody targets highly conserved residues in the receptor binding site and contacts antigenic sites A, B, and D. Binding and plaque reduction assays show that the monovalent Fab alone can protect against H3 strains, but the enhanced avidity from binding of bivalent IgG increases the breadth of neutralization to additional strains from the H1, H2, H13, and H16 subtypes. Thus, antibodies making relatively low affinity Fab interactions with the receptor binding site can have significant antiviral activity when enhanced by avidity through bivalent interactions of the IgG, thereby extending the breadth of binding and neutralization to highly divergent influenza virus strains and subtypes.

subject areas

  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Antibody Affinity
  • Chromatography, Gel
  • Cloning, Molecular
  • Crystallography, X-Ray
  • Epitopes
  • Hemagglutinins, Viral
  • Immunoglobulin Fab Fragments
  • Influenza A Virus, H3N2 Subtype
  • Interferometry
  • Models, Molecular
  • Neutralization Tests
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Identity

PubMed Central ID

  • PMC3479480

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.1212371109

PubMed ID

  • 23027945
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Additional Document Info

start page

  • 17040

end page

  • 17045

volume

  • 109

issue

  • 42

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