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Equine herpesvirus 1 (EHV-1, Kentucky A strain) preparations enriched for defective interfering particles (DIPs) can readily establish persistent infection. The UL1 gene, which is conserved in the genome of DIPs that mediate persistent infection, maps between nucleotides 1418 and 2192 (258 amino acids) from the L (long) terminus. UL1 has no homology with any known gene encoded by herpes simplex virus type 1 but has limited homology to open reading frame 2 of varicella-zoster virus and the "circ" gene of bovine herpesvirus type 1. Previous work showed that the EHV-1 UL1 gene belongs to the early kinetic class and is transcribed as a 1.2-kb polyadenylated mRNA (R. N. Harty, R. R. Yalamanchili, and D. J. O'Callaghan, Virology 183:830-833, 1991). In this report, the UL1 protein was identified and characterized as a 33-kDa polypeptide in EHV-1-infected cells by using rabbit polyclonal antiserum raised against a TrpE-UL1 fusion protein (amino acids 7 to 258 of UL1) synthesized in Escherichia coli. Results from Western blot (immunoblot), immunoprecipitation, indirect immunofluorescence, and biochemical analyses indicated that the UL1 polypeptide (i) is more abundant in cells infected with DIP-enriched virus than in cells infected with standard EHV-1, (ii) is synthesized as early as 3 h postinfection (p.i.) in infection with standard virus or in infection with DIP-enriched virus preparations and increases in abundance up to 12 h p.i., (iii) appears to be associated with the rough endoplasmic reticulum-Golgi apparatus early in infection (3 to 4 h p.i.), while a diffuse cytoplasmic pattern of fluorescence is observed late in infection (7 to 8 h p.i.), (iv) is modified by myristic acid as it contains a consensus N-terminal myristylation site and is readily labeled with [3H]myristic acid, and (v) is associated with mature EHV-1 virions.

journal of virology

Characterization of the myristylated polypeptide encoded by the UL1 gene that is conserved in the genome of defective interfering particles of equine herpesvirus 1