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Major neutralization antigenic sites have been previously mapped by us on VP1, the largest capsid protein of poliovirus type 1. Here we report the first identification of the primary sequence of a neutralization antigenic site on capsid protein VP2. Inspection of the amino acid sequence of VP2 led to the selection and synthesis of a peptide (n = 12) that, after linking to a carrier protein, induced an antiviral neutralizing antibody response in rabbits. The response was augmented by a single subsequent inoculation of intact virus; thus, the peptide was also capable of priming the production of neutralizing antibodies. These antibodies were directed only against the site specified by the synthetic peptide. Although the VP2-specific neutralization antigenic site appears not to be strongly immunogenic in the intact virion, it can nevertheless contribute to neutralization of poliovirus. This observation may be important for the development of peptide vaccines.
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