Author for correspondence: Esteban Domingo.Fax +34 91 3974799. e-mail edomingo@cbm.uam.es
b Present address: The Scripps Research Institute, Department of Neuropharmacology (IMM-6), 10550 North Torrey Pines Road, La Jolla, California, CA 92037, USA.
The antigenic properties and genetic stability of a multiply passaged foot-and-mouth disease virus (FMDV) clone C-S8c1 with an Arg-Gly-Gly triplet (RGG) instead of the Arg-Gly-Asp (RGD) integrin-recognition motif at positions 141 to143 of capsid protein VP1 are described. Clear antigenic differences between FMDV RGG and clone C-S8c1 have been documented in ELISA, enzyme-linked immunoelectrotransfer (Western) blot and neutralization assays using site A-specific monoclonal antibodies and anti-FMDV polyclonal antibodies from swine and guinea pigs. The results validate with a live virus the role of the RGD (in particular Asp-143) in recognition of (and neutralization by) antibodies, a role previously suggested by immunochemical and structural studies with synthetic peptides. The FMDV RGG was genetically stable in a large proportion of serial infections of BHK-21 cells. However, a revertant virus with RGD was generated in one out of six passage series. Interestingly, this revertant FMDV did not reach dominance but established an equilibrium with its parental FMDV RGG, accompanied by an increase of quasispecies complexity at the sequences around the RGG triplet. FMDV RGG exhibited a selective disadvantage relative to other RGD-containing clones isolated from the same parental FMDV population. The results suggest that large antigenic variations can be prompted by replacements at critical capsid sites, including those involved in receptor recognition. These critical replacements may yield viruses whose stability allows them to replicate efficiently and to expand the sequence repertoire of an antigenic site.
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