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. 1993 Sep;31(9):2291–2297. doi: 10.1128/jcm.31.9.2291-2297.1993

Characterization of the neutralizing epitopes of VP7 of the Gottfried strain of porcine rotavirus.

S Y Kang 1, D A Benfield 1, M Gorziglia 1, L J Saif 1
PMCID: PMC265749  PMID: 7691871

Abstract

The neutralization epitopes of the outer capsid protein VP7 of a porcine group A rotavirus were studied by using neutralizing monoclonal antibodies (N-MAbs). Six N-MAbs which were specific for the VP7 protein of the Gottfried strain of porcine rotavirus (serotype G4) were used for analyzing the antigenic sites of VP7. Three different approaches were used for this analysis: testing the serological reactivity of each N-MAb against different G serotypes of human and animal rotaviruses, analyzing N-MAb-resistant viral antigenic variants, and performing a nucleotide sequence analysis of the VP7 gene of each of the viral antigenic variants generated. From the serological analyses, three different reactivity patterns were recognized by plaque reduction virus neutralization and cell culture immunofluorescence tests. A single MAb (RG36H9) reacted with animal rotavirus serotypes G3 and G4 but not with human serotypes G3 and G4. The MAb 57/8 (D. A. Benfield, E. A. Nelson, and Y. Hoshino, p. 111, in Abstr. VIIth Internat. Congr. Virol., 1987, and E. R. Mackow, R. D. Shaw, S. M. Matsui, P. T. Vo, D. A. Benfield, and H. B. Greenberg, Virology 165:511-517, 1988) reacted with animal and human rotavirus serotypes G3 and G4 and also with human serotype G9 and bovine serotype G6. The other four MAbs reacted only with the porcine rotavirus serotype G4. The epitope defined by MAb 57/8 and the epitope defined by the other five MAbs appeared to be partially overlapping or close to each other, as identified by viral antigenic variant analysis. However, data from nucleotide and deduced amino acid sequence analyses of the VP7 of each of the viral antigenic variants showed that these two epitopes constituted a large, single neutralization domain.

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Selected References

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