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We have looked for conserved DNA sequences between four herpes simplex virus type 1 (HSV-1) glycoprotein genes encoding gB, gC, gD, and gE and pseudorabies virus (PRV) DNA, HSV-1 DNA fragments representing these four glycoprotein-coding sequences were hybridized to restriction enzyme fragments of PRV DNA by the Southern blot procedure. Specific hybridization was observed only when HSV-1 gB DNA was used as probe. This region of hybridization was localized to a 5.2-kilobase (kb) region mapping at approximately 0.15 map units on the PRV genome. Northern blot (RNA blot) analysis, with a 1.2-kb probe derived from this segment, revealed a predominant hybridizing RNA species of approximately 3 kb in PRV-infected PK15 cells. DNA sequence analysis of the region corresponding to this RNA revealed a single large open reading frame with significant nucleotide homology with the gB gene of HSV-1 KOS 321. In addition, the beginning of the sequenced PRV region also contained the end of an open reading frame with amino acid homology to HSV-1 ICP 18.5, a protein that may be involved in viral glycoprotein transport. This sequence partially overlaps the PRV gB homolog coding sequence. We have shown that the PRV gene with homology to HSV-1 gB encoded the gII glycoprotein gene by expressing a 765-base-pair segment of the PRV open reading frame in Escherichia coli as a protein fused to beta-galactosidase. Antiserum, raised in rabbits, against this fusion protein immunoprecipitated a specific family of PRV glycoproteins of apparent molecular mass 110, 68, and 55 kilodaltons that have been identified as the gII family of glycoproteins. Analysis of the predicted amino acid sequence indicated that the PRV gII protein shares 50% amino acid homology with the aligned HSV-1 gB protein. All 10 cysteine residues located outside of the signal sequence, as well as 4 of 6 potential N-linked glycosylation sites, were conserved between the two proteins. The primary protein sequence for HSV-1 gB regions known to be involved in the rate of virus entry into the cells and cell-cell fusion, as well as regions known to be associated with monoclonal antibody resistance, were highly homologous with the PRV protein sequence. Furthermore, monospecific antibody made against PRV gII immunoprecipitated HSV-1 gB from infected cells. Taken together, these findings suggest significant conservation of structure and function between the two proteins and may indicate a common evolutionary history.

The pseudorabies virus gII gene is closely related to the gB glycoprotein gene of herpes simplex virus