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. 1993 Apr;67(4):2103–2109. doi: 10.1128/jvi.67.4.2103-2109.1993

Analysis of bovine herpesvirus 1 glycoprotein gIV truncations and deletions expressed by recombinant vaccinia viruses.

S K Tikoo 1, T J Zamb 1, L A Babiuk 1
PMCID: PMC240303  PMID: 8383232

Abstract

Glycoprotein gIV is an envelope component of bovine herpesvirus type 1 and appears to be involved in attachment, penetration, and cell fusion. Four antigenic domains which include both continuous and discontinuous epitopes have been previously defined by competition binding assays using gIV-specific monoclonal antibodies (MAbs). Here we describe the construction of C-terminal truncations and internal deletions in the gIV-encoding gene and analyses of the effects of these mutations on the synthesis, processing, transport, and antigenicity of glycoprotein gIV as expressed by recombinant vaccinia viruses. Wild-type gIV expressed by recombinant vaccinia virus STgIV was indistinguishable from authentic gIV produced in bovine herpesvirus 1-infected cells with respect to molecular weight, processing, transport, and antigenicity. Analysis of the mutant proteins showed that the binding sites for MAbs 9D6 and 3D9S, which recognize linear epitopes, lie between amino acids 164 and 216 and amino acids 320 and 355, respectively. Discontinuous epitopes recognized by MAbs 3E7, 4C1, 2C8, and 3C1 were located between amino acids 19 and 320, whereas amino acids 320 to 355 were critical for binding of MAb 136. All mutant proteins containing amino acids 245 to 320 were processed, possess endo-beta-N-acetylglucosaminidase H-resistant oligosaccharides, and were transported to the cell surface or secreted into the medium. In contrast, mutant proteins missing amino acids 245 to 320 were retained in the rough endoplasmic reticulum. These findings suggest that residues 245 to 320 are important for proper processing and transport of gIV to the cell surface.

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Selected References

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