Abstract
A vaccinia virus gene required for multiplication in some cell lines but not in others has been previously isolated and sequenced. A synthetic peptide predicted from the nucleotide sequence and corresponding to the carboxy-terminal 18 amino acids was used to raise antibodies in rabbits. The immune serum enabled detection of a 29-kilodalton (kDa) polypeptide by either immunoprecipitation or Western immunoblot assays. Synthesis of the 29-kDa polypeptide occurred immediately after infection and lasted for about 3 h. Shutoff of its synthesis was concomitant with the appearance of a delayed early polypeptide that may be antigenically related to the 29-kDa polypeptide. Analysis of cloned segments of the genomes of other orthopoxviruses by hybridization with the vaccinia virus host range gene demonstrates that it is well conserved within this genus.
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