Journal of Protein Chemistry

, Volume 12, Issue 3, pp 255–259

Binding affinity of influenza virus N9 neuraminidase with Fab fragments of monoclonal antibodies NC10 and NC41


  • L. C. Gruen
    • CSIRO Division of Biomolecular Engineering
  • T. L. McInerney
    • Department of MicrobiologyUniversity of Melbourne
  • R. G. Webster
    • Department of Virology and Molecular BiologySt. Jude Children's Hospital
  • D. C. Jackson
    • Department of MicrobiologyUniversity of Melbourne

DOI: 10.1007/BF01028188

Cite this article as:
Gruen, L.C., McInerney, T.L., Webster, R.G. et al. J Protein Chem (1993) 12: 255. doi:10.1007/BF01028188


Sedimentation equilibrium centrifugation has been applied to determine the affinity and stoichiometry of the interaction between Fab fragments, derived from monoclonal antibodies NC10 and NC41, with influenza virus neuraminidase N9 isolated from either tern or whale. Although the two neuraminidase epitopes recognized by NC10 and NC41 Fab overlap, crystal-lographic studies have shown that the modes of binding of each Fab are different. The sedimentation equilibrium experiments described here reveal that the binding affinities are also different, with NC10 Fab binding more strongly to each neuraminidase. Furthermore, comparison of the affinity of binding of each antibody fragment reveals a stronger interaction with tern neuraminidase than with whale neuraminidase. Although the respective epitopes recognized by each antibody on the two antigens are similar, this technique shows that they do nevertheless possess sufficient differences to affect significantly the binding of antibody.

Key words

Neuraminidaseantibodybindingsedimentation equilibrium
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Copyright information

© Plenum Publishing Corporation 1993