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Updated: Jul 2, 2026
Detection of Neutralization-sensitive Epitopes in Antigens Displayed on Virus-Like Particle (VLP)-Based Vaccines Using a Capture Assay
Published on: February 10, 2022
Molecular assessment of the role of envelope-associated structural proteins in cross neutralization among different
1Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, 1600 South 16th Street, Ames, IA 50011, USA.
Abstract:
To assess the role of each envelope-associated protein (i.e., ORFs 2-6 products) of type 2 PRRSV in cross neutralization mediated by antibody, chimeric mutants were generated by replacing ORFs of a VR2332-based infectious clone with those of JA142, SDSU73, PRRS124, or 2M11715 that are genetically and antigenically distinct from VR2332 and two-way neutralization assays were performed on those mutants using VR2332, JA142, SDSU73, or PRRS124 antisera. All ORF 5-replaced mutants showed increased susceptibility or resistance against homologous or heterologous antisera, respectively, in comparison to that of the donor strains, but failed to achieve a complete reversion of cross neutralization. In contrast, substitution of ORFs 3-6 completely reversed the susceptibility of the virus to neutralization by antibody. Changes in ORFs 3, 5, and 6 were additively responsible for reversion of the susceptibility, suggesting that the genetic similarity of these ORFs should be considered for better cross neutralization between two different type 2 PRRS viruses.
