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. 1989 Mar;63(3):1123–1133. doi: 10.1128/jvi.63.3.1123-1133.1989

Identification and nucleotide sequence of the glycoprotein gB gene of equine herpesvirus 4.

M P Riggio 1, A A Cullinane 1, D E Onions 1
PMCID: PMC247807  PMID: 2915378

Abstract

The nucleotide sequence of the glycoprotein gB gene of equine herpesvirus 4 (EHV-4) was determined. The gene was located within a BamHI genomic library by a combination of Southern and dot-blot hybridization with probes derived from the herpes simplex virus type 1 (HSV-1) gB DNA sequence. The predominant portion of the coding sequences was mapped to a 2.95-kilobase BamHI-EcoRI subfragment at the left-hand end of BamHI-C. Potential TATA box, CAT box, and mRNA start site sequences and the translational initiation codon were located in the BamHI M fragment of the virus, which is located immediately to the left of BamHI-C. A polyadenylation signal, AATAAA, occurs nine nucleotides past the chain termination codon. Translation of these sequences would give a 110-kilodalton protein possessing a 5' hydrophobic signal sequence, a hydrophilic surface domain containing 11 potential N-linked glycosylation sites, a hydrophobic transmembrane domain, and a 3' highly charged cytoplasmic domain. A potential internal proteolytic cleavage site, Arg-Arg/Ser, was identified at residues 459 to 461. Analysis of this protein revealed amino acid sequence homologies of 47% with HSV-1 gB, 54% with pseudorabies virus gpII, 51% with varicella-zoster virus gpII, 29% with human cytomegalovirus gB, and 30% with Epstein-Barr virus gB. Alignment of EHV-4 gB with HSV-1 (KOS) gB further revealed that four potential N-linked glycosylation sites and all 10 cysteine residues on the external surface of the molecules are perfectly conserved, suggesting that the proteins possess similar secondary and tertiary structures. Thus, we showed that EHV-4 gB is highly conserved with the gB and gpII glycoproteins of other herpesviruses, suggesting that this glycoprotein has a similar overall function in each virus.

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Selected References

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