Abstract
In the rotavirus SA11 surface protein VP4, the trypsin cleavage sites associated with the enhancement of infectivity are flanked by two amino acid regions that are highly conserved among different rotaviruses. We have tested the ability of synthetic peptides that mimic these two regions to induce and prime for a rotavirus neutralizing antibody response in mice. After the peptide immunization schedule, both peptides induced peptide antibodies, but neither was able to induce virus antibodies, as measured by an enzyme-linked immunosorbent assay or a neutralization assay. However, when the peptide-inoculated mice were subsequently injected with intact SA11 virus, a rapid and high neutralizing antibody response was observed in mice that had previously received the peptide comprising amino acids 220 to 233 of the VP4 protein. This neutralizing activity was serotype specific; however, this peptide was also able to efficiently prime the immune system of mice for a neutralizing antibody response to the heterotypic rotavirus ST3 when the ST3 virus was used for the secondary inoculation.
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Selected References
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