Abstract
A homologue of the herpes simplex virus (HSV) glycoprotein D gene has been identified in the genome of equine herpesvirus-1 (EHV-1, equine abortion virus). An open reading frame in the middle of the short unique (US) region is capable of encoding a polypeptide of 402 amino acids that has 26% and 20% of its residues matching pseudorabies virus (PRV) gp50 and HSV-1 gD, respectively. Despite this low level of similarity, the positional identity of six cysteine residues and certain motifs, and the location of the EHV-1 gene, clearly define the EHV-1 polypeptide as one of a family of “gD-like” proteins. Two transcripts of 3.3–3.6 kb and 5.4–5.9 kb were identified, consistent with coterminal mRNAs for the EHV-1 gD gene and the adjacent upstream gene, respectively. Partial sequencing of other regions in US also revealed EHV-1 homologues of HSV-1 gE and gI genes, and a possible equivalent gene to PRV gX. By analogy with the ability of HSV-1 gD and PRV gp50 to induce strong anti-viral immune responses, the EHV-1 gD gene product is expected to be an excellent candidate for development as a vaccine antigen.
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Whalley, M., Robertson, G., Bell, C. et al. Identification and comparative sequence analysis of a gene in equine herpesvirus 1 with homology to the herpes simplex virus glycoprotein D gene. Virus Genes 5, 313–325 (1991). https://doi.org/10.1007/BF00271530
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DOI: https://doi.org/10.1007/BF00271530