Temporal regulation of equine herpesvirus type 3 transcription.
The transcription of equine herpesvirus type 3 (EHV-3; equine coital exanthema virus) has been examined and found to be temporally regulated into three classes: immediate early (IE), early (E), and late (L). Hybridization of in vivo 32PO4-labeled transcripts revealed that IE transcript(s) are derived exclusively from the inverted repeat segments (IRs) of the viral genome, while E and L transcripts are not restricted to any specific region of the genome. Northern blot analysis of EHV-3 IE RNA revealed a single transcript of approximately 5.7 kb (3.8 MDa). We have previously shown that transcription of equine herpesvirus type 1 (EHV-1) DNA is temporally regulated and produces a single 6 kb IE RNA which is derived from the IRs segments. In this paper, we show that the EHV-1 and EHV-3 IE RNA species are homologous, reflecting the colinearity of the genomes of these two related viruses. While four IE polypeptides are synthesized in EHV-1 infected cells in the presence of actinomycin D following the removal of a cycloheximide block, only one major IE polypeptide (180 kDa) is detectable in EHV-3 infected cells under these conditions. However, immunoprecipitation of EHV-3 infected cell extracts with polyvalent rabbit antisera to IE1 of EHV-1 revealed at least two other viral specific IE polypeptides.
Sullivan
D C
DC
Department of Microbiology and Immunology, Louisiana State University Medical Center, Shreveport 71130.
Gray
W L
WL
Caughman
G B
GB
Robertson
A T
AT
O'Callaghan
D J
DJ
D000818:Animals; D015152:Blotting, Northern; D006564:Herpesviridae / Q000235:genetics*; D004858:Herpesvirus 3, Equid / Q000235:genetics*; D012367:RNA, Viral / Q000032:analysis / Q000096:biosynthesis; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000032:analysis
D012367:RNA, Viral; D014764:Viral Proteins