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. 1986 Feb;57(2):623–628. doi: 10.1128/jvi.57.2.623-628.1986

Selection of influenza A virus adsorptive mutants by growth in the presence of a mixture of monoclonal antihemagglutinin antibodies.

J W Yewdell, A J Caton, W Gerhard
PMCID: PMC252777  PMID: 2418215

Abstract

The influenza virus hemagglutinin contains four major regions that are recognized by antibodies able to neutralize viral infectivity. To investigate the effect of an antibody response directed against each of these sites on viral evolution, influenza virus A/PR/8/34 (H1N1) was grown in allantois-on-shell cultures in the presence of a mixture of monoclonal antihemagglutinin antibodies. This selection mixture contained antibodies (two or three antibodies per antigenic site) whose concentrations were adjusted to achieve equal neutralization titers against each of the four antigenic sites. By varying the ratio of input virus to selection mixture concentration, we observed that variant viruses emerged under conditions of partial neutralization. Each of the four variants characterized in detail differed from the parental virus in its interaction with cellular receptors and exhibited minimal changes in antigenicity. Thus, these variants were virtually indistinguishable from wild-type viruses, as assessed by the binding of 103 monoclonal antihemagglutinin antibodies in an indirect radioimmunoassay. Despite this, many of the same antibodies demonstrated decreased titers to the variants in hemagglutination inhibition tests. The magnitude of the differences depended on the indicator erythrocytes used (much greater differences were detected with chicken erythrocytes than with human erythrocytes). Hemagglutination mediated by the variants was more resistant to neuraminidase treatment of erythrocytes than hemagglutination mediated by the parental virus. These findings are consistent with the idea that the variants were initially selected by virtue of their increased avidity for host cell receptors. Sequencing of viral RNA revealed that each of the variants differed from the parental virus by a single amino acid alteration in its HA1 subunit. Two of the changes were close to the proposed receptor binding site on hemagglutinin and could directly alter receptor binding, while a third was located near the trimer interface and may have increased receptor binding by altering monomer-monomer interactions.

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Selected References

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