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The gene encoding bovine herpesvirus 1 (BHV-1) glycoprotein gIV was mapped, cloned, and sequenced. The gene is situated between map units 0.892 and 0.902 and encodes a predicted protein of 417 amino acids with a signal sequence cleavage site between amino acids 18 and 19. Comparison of the BHV-1 amino acid sequence with the homologous glycoproteins of other alphaherpesviruses, including herpes simplex virus type 1 glycoprotein gD, revealed significant homology in the amino-terminal half of the molecules, including six invariant cysteine residues. The identity of the open reading frame was verified by expression of the authentic recombinant BHV-1 gIV in bovine cells by using eucaryotic expression vectors pRSDneo (strong, constitutive promoter) and pMSG (weak, dexamethasone-inducible promoter). Constitutive expression of gIV proved toxic to cells, since stable cell lines could only be established when the gIV gene was placed under the control of an inducible promoter. Expression of gIV was cell associated and localized predominantly in the perinuclear region, although nuclear and plasma membrane staining was also observed. Radioimmunoprecipitation revealed that the recombinant glycoprotein was efficiently processed and had a molecular weight similar to that of the native form of gIV expressed in BHV-1-infected bovine cells. Recombinant gIV produced in the transfected bovine cells induced cell fusion, polykaryon formation, and nuclear fusion. In addition, expression of gIV interfered with BHV-1 replication in the transfected bovine cells.

Molecular cloning, sequencing, and expression of functional bovine herpesvirus 1 glycoprotein gIV in transfected bovine cells