1887

Abstract

Knowledge of the antigenic structure of foot-and-mouth disease virus (FMDV) has relevance in the development of diagnostic assays, in the evaluation of the antigenic variability and in the selection of appropriate vaccine strains. Antigenic sites have been investigated only in FMDVs of serotypes O, A and C, while it would be valuable to extend studies also to other serotypes. This paper reports the identification of antigenic sites involved in virus neutralization in the FMDV serotype Asia 1 by using a new panel of mAbs and their relation with sites described in other serotypes is discussed. Out of 24 mAbs raised against the FMDV serotype Asia 1, 10 neutralize viral infectivity and were used to select FMDV mutants resistant to neutralization. On the basis of their reactivity profile with virus mutants, the 10 neutralizing mAbs were clustered in four groups corresponding to four independent antigenic sites. By comparing the amino acid sequence of the parental virus and of virus mutants, the amino acids crucial for the four sites were mapped at the following positions: VP1 140–142, VP2 67–79, VP3 58/59 and VP3 218. Three of the four neutralizing sites identified and mapped on FMDV serotype Asia 1 correspond structurally and functionally to analogous sites described in FMDV serotypes O, A and C, enforcing the evidence that these are dominant antigenic sites in the FMDV structure. The fourth site, located at the C terminus of VP3, is a new independent site, described for the first time in FMDV.

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2013-03-01
2019-12-06
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