1887

Abstract

Monoclonal antibody (MAb) IIB4 displays a rare combination of virus neutralization (VN) activity and broad cross-reactivity with influenza A virus strains of the H3 subtype isolated in a period from 1973 to 1988. The epitope of this antibody has been identified as around HA1 residues 198, 199 and 201. Here we report that residues 155, 159, 188, 189 and 193 also influence the binding of this antibody. We have used this antibody to study the relationship between antibody affinity and VN activity. Using one MAb and a single epitope on the haemagglutinin (HA) of different influenza viruses we found a strong positive correlation between effective affinity and VN activity of MAb IIB4. A 10-fold increase in effective affinity corresponded to the 2000-fold increase in VN titre. It follows from the law of mass action that for an effective affinity =9×10 l/mol, 50% VN was achieved at approx. 10% occupation of HA spikes with antibody. In contrast, for an effective affinity =6×10 l/mol, to achieve 50% VN, occupation of up to 98% of HA spikes was required. An effective affinity about =6×10 l/mol thus represents the limiting value for VN because a further decrease in the affinity cannot be compensated by a higher concentration of antibody.

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2000-07-01
2019-10-15
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