Foot-and-mouth disease (FMD), caused by foot-and-mouth disease virus (FMDV), is a highly contagious infectious disease that affects domestic and wild cloven-hoofed animals worldwide. VP2 is a structural protein of FMDV. In this study, a potent FMDV serotype-independent monoclonal antibody (MAb) 3D9 was generated. Screening of a phage-displayed random 12-peptide library revealed that MAb 3D9 bound to phages displaying a consensus motif GVYxxAYxW that is highly homologous to the 89GVYxxxxxxxAYxxxxW105 motif in the FMDV VP2 protein. Importantly, this conformational epitope was highly conserved among all seven serotypes of FMDV analyzed in sequence alignments. To further verify the authentic epitope recognized by MAb 3D9, a FMDV O/YS/CHA/05 mutant virus V90A was generated using a reverse genetics system. The results revealed that Val90 was an important residue for MAb 3D9 binding within this conformational epitope. Thus, we finely mapped a conserved conformational epitope onto the FMDV VP2 protein. These results could be applied in the development of epitope-based vaccines and suitable MAb-based diagnostic methods for various FMDV serotype-independent tests.
Archives of Virology – Springer Journals
Published: Mar 3, 2017
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