Abstract
Clinical and biological studies indicate that simian varicella virus (SVV) infection of primates is the counterpart of human varicella zoster virus (VZV) infection. We have identified an SVV open reading frame (ORF) that is homologous to the VZV protein IE62 and herpes simplex virus (HSV) ICP4. Like the genes encoding the VZV and HSV proteins, the SVV gene is located in the repeat region of the virus genome. Its expression in SVV-infected cells yields a 4.2-kb transcript. DNA sequencing of the SVV gene reveals a coding region 3834 nucleotides in length and a G + C content of 60.3%. Like ICP4 homologues in other herpesviruses, the SVV protein has five regions, two of which (regions 2 and 4) are highly conserved. The SVV protein also contains a run of serine residues in its amino terminus that is characteristic of herpesvirus ICP4 homologues. The SVV protein shows an overall homology of 24% to HSV ICP4 and 53% to VZV IE62.
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