1887

Abstract

By analysing the antigenic structure of the morbillivirus nucleoprotein (N) using a competitive-binding assay of monoclonal antibodies (mAbs), six different antigenic sites were identified previously. By using Pepscan methodology complemented by analysis of truncated N proteins, a better characterization of five of these antigenic sites was provided: I, II, III, IV and VI. mAbs specific to , defining antigenic sites II, III and IV, and those common to four morbilliviruses, delineating sites I and VI, were analysed in the present study. It was found that all but one mapped to the same region, between aa 120 and 149 of N. However, the mAb 3-1 epitope was located in the carboxy-terminal region (aa 421–525). This result may indicate the high immunogenicity of the amino-terminal variable region, at least in the mouse. It was surprising that the epitope of mAb 33-4, antigenic site VI, which recognized all morbilliviruses so far tested, was located in one of the two non-conserved regions between morbillivirus N proteins. It is shown that the conserved amino acid motif EAD----F-------EN is critical for epitope constitution and recognition.

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2007-04-01
2020-10-30
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