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The region of the UL component of the herpes simplex virus type 1 genome between nucleotides 17,793 and 25,150 includes three open reading frames that code for the protein products of the UL8, UL9, and UL10 genes (D.J. McGeogh, M.A. Dalrymple, A.J. Davison, A. Dolan, M.C. Frame, D. McNab, L.J. Perry, J.E. Scott, and P. Taylor, J. Gen. Virol. 69:1531-1574, 1988). We have mapped and characterized the overlapping transcripts in this region and have found that, in addition to the low-abundance UL8 and UL9 transcripts and the abundant UL10 transcript, at least two additional transcription units, designated UL8.5 and UL9.5, are specified by this region of the genome. The 5' ends of the UL8, UL8.5, and UL9 transcripts were mapped to nucleotides 20,682, 22,351, and 23,381, respectively. The 5' terminus of the UL9.5 transcript has not yet been mapped. The 3' ends of the UL8, UL8.5, UL9, and UL9.5 transcripts are coterminal at nucleotide 18,197. The 5' end of the UL10 mRNA, which is transcribed from the strand opposite that specifying the UL8, UL8.5, UL9, and UL9.5 transcripts, lies within the UL9 open reading frame at nucleotide 22,944, while the 3' terminus was mapped to nucleotide 24,666. Time course studies demonstrated that the UL8 and UL9 transcripts are members of the early kinetic class, the UL8.5 mRNA is a delayed-early transcript, and the UL9.5 and UL10 transcripts belong to the true-late kinetic class. Examination of the nucleotide sequence of the UL8.5 transcript revealed a potential open reading frame that overlaps and is in frame with the C-terminal half of the open reading frame encoding the origin-binding protein (OBP), the product of the UL9 gene. In vitro translation of the UL8.5 transcript demonstrated that it encodes a protein with an apparent molecular mass of 53 kDa. This protein was recognized by antibody directed against the C-terminal region of OBP and has thus been designated OBPC. A protein with an identical apparent molecular mass was also recognized by this antibody in infected-cell lysates, indicating that OBPC is synthesized during viral infection.

journal of virology

Transcriptional analysis of the region of the herpes simplex virus type 1 genome containing the UL8, UL9, and UL10 genes and identification of a novel delayed-early gene product, OBPC