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The DNA sequence of equine herpesvirus 2.

Telford E.A.R., Watson M.S., Aird H.C., Perry J., Davison A.J.

The complete DNA sequence of equine herpesvirus 2 (EHV-2) strain 86/67 was determined. The genome is 184,427 bp in size and has a base composition of 57.5% G + C. Unusually for a herpesvirus, about a third of the sequence distributed in several large blocks appears not to encode proteins. The 79 open reading frames that were identified as probably polypeptide-coding are predicted to encode 77 distinct proteins. Amino acid sequence comparisons confirmed that EHV-2 is a gamma-herpesvirus that is genetically collinear with herpesvirus saimiri (HVS; a gamma 2-herpesvirus) and Epstein-Barr virus (EBV; a gamma 1-herpesvirus), with a closer relationship to the former. Moreover, EHV-2 specifies eight proteins that have counterparts in HVS but not in EBV and only a single protein that has a homologue in EBV but not in HVS (EBV BCRF1, which encodes an interleukin 10-like protein). EHV-2 also encodes three potential G protein-coupled receptors, one with a counterpart in HVS that is specific for alpha chemokines, another with a counterpart in human cytomegalovirus (a beta-herpesvirus), which is specific for beta chemokines, and a third that is assigned more tentatively and lacks detectable counterparts in other herpesviruses.

J. Mol. Biol. 249:520-528(1995) [PubMed] [Europe PMC]

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