Virus, strain, and epitope specificities of neutralizing bovine monoclonal antibodies to bovine herpesvirus 1 glycoproteins gB, gC, and gD, with sequence and molecular model analysis

Veterinary Immunology and Immunopathology
Randall L LevingsJames A Roth

Abstract

Three bovine monoclonal antibodies (BomAb) raised to bovine herpesvirus (BoHV) 1.1 and specific for the viral glycoproteins gB, gC, and gD were tested for reactivity to two isolates of BoHV-1.1, one of BoHV-1.2, and two of BoHV-5 in virus neutralization and indirect fluorescent antibody assays. They were also tested with other herpesviruses infecting cattle and other mammalian alphaherpesviruses, and found negative or of negligible reactivity. Their BoHV-1.1 epitope specificity was examined using competitive ELISA with peroxidase-labeled murine monoclonal antibodies (MumAb) that had been previously characterized. To explain the incongruities observed, the amino acid sequences of the epitopes and adjacent regions of BoHV-1.1, 1.2, and 5 were compared, and molecular modeling was performed using human herpesvirus 1 glycoprotein crystals as templates. The anti-gB BomAb reacted strongly with BoHV-1.1 and BoHV-1.2, and poorly or not at all with BoHV-5. It competed with a MumAb specific for a BoHV-1.1 gB epitope previously shown to only partially cross-react between BoHV-1 and BoHV-5. BoHV-5 gB has nearly identical sequence with BoHV-1.1 in the epitope region, but modeling suggested the lack of cross-reactivity of the MumAb was due to...Continue Reading

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