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The 160,000-Mr virion protein encoded at the right end of the herpesvirus saimiri genome is homologous to the 140,000-Mr membrane antigen encoded at the left end of the Epstein-Barr virus genome

The sequence of 4.4 kilobase pairs (kbp) from the conventional right terminus of the A + T-rich light-DNA (L-DNA) sequences of the herpesvirus saimiri (HVS) genome contains a leftward-directed open reading frame (ORF) for a 1,299-residue protein. The molecular weight predicted for the protein (143,000) is in good agreement with the estimates of 150,000 to 160,000 for the major nonglycosylated polypeptide of the virion tegument (the 160K polypeptide), previously shown to be encoded by this region of the genome. The first initiation codon of the ORF is only 250 nucleotides from the junction of the L-DNA component with the G + C-rich terminal reiterations (i.e., heavy or H-DNA) of the genome. An unusually A + T-rich sequence (43 of 45 nucleotides are A or T, relative to a mean composition of 40% G + C for the ORF) occurs some 75 bp 5' to this initiation codon, and the first adenylation signal (AATAAA) on this DNA strand occurs 18 bp 3' to the termination codon. The amino acid sequence predicted for the 160K protein of HVS is homologous over most of its length to the 1,318-residue protein encoded by the leftmost major ORF of the G + C-rich genome of Epstein-Barr virus (BNRF1, the 140K nonglycosylated membrane antigen). No homology to either of these proteins is evident among the products predicted from the complete sequence of the alpha herpesvirus varicella-zoster virus. Thus gamma herpesviruses with coding sequences which differ in mean nucleotide composition by some 20% G + C have homologous proteins encoded at similar positions with respect to genome termini, with the right end of HVS being homologous to the left end of Epstein-Barr virus.