Abstract
Ten monoclonal antibodies directed against envelope glycoprotein V3 (E) of Japanese encephalitis virus were obtained. They were characterized by hemagglutination inhibition (HI), neutralization, and enzyme-linked immunosorbent assay and divided into four types: flavivirus-cross-reactive HI and non-neutralizing antibody (group 1), subgroup-specific HI and non-neutralizing antibody (group 2), low HI and neutralizing antibody (group 3), and non-HI and neutralizing antibody (groups 4 and 5, respectively). Competitive binding assays were performed to analyze the topography of antigenic determinants by enzyme-linked immunosorbent assay. The results of the competitive binding assay separated non-HI and neutralizing antibody into groups 4 and 5, respectively, and demonstrated the existence of at least five distinct antigenic determinants on V3. The site of group 1 was distinct from any other site. The sites of groups 2 and 3 seemed to be located close together. Our results suggest the following relationship between HI and neutralization: (i) The HI sites are separated from the neutralization sites, and (ii) there are two distinct HI sites, one of which is flavivirus cross-reactive, the other subgroup specific.
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