Topology and functionality of BV-displayed scFvE2/p17 molecules. Baculoviral progeny recovered from the culture medium of Sf9 cells infected with BV-E2/p17 was isolated by ultracentrifugation. (a), BV-E2/p17 virions were immobilized on ELISA plate and reacted with anti-HA tag monoclonal antibody and peroxidase-labeled complementary antibody. Controls were from left to right, respectively: uncoated well, well coated with antigen with no BV addition, and well coated with antigen with addition of irrelevant baculovirus particles (CAR-displaying BVCAR; ). (b), Schematic model of scFvE2/p17 molecule displayed at the surface of a BV particle. GP64, baculoviral envelope major glycoprotein. BV-E2/p17 virions were reacted in ELISA with immobilized antigen, (c) H6MA-CA-embedded p17 epitope, or (d) synthetic peptide p17.1. Average of three separate experiments, m ± SEM; (*), P < 0.05); (**), P < 0.01).