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J Virol. 1984 September; 51(3): 662-669

Regulation of expression and nucleotide sequence of a late vaccinia virus gene.

ABSTRACT

A subset of vaccinia virus genes are expressed only after DNA replication. To investigate the regulation of such transcriptional units, a representative gene encoding a major late polypeptide (Mr, 28,000) was mapped and sequenced. Translatable mRNAs were heterogeneous in length and overlapped several early genes downstream. The 5' end of the message was located, and the DNA segment upstream was excised and ligated to the coding sequence of the easily assayable procaryotic chloramphenicol acetyltransferase gene. The resulting chimeric gene was recombined into the thymidine kinase locus of the vaccinia virus genome, and infectious recombinant virus was isolated. Both the time of chloramphenicol acetyltransferase synthesis in infected cells and the requirement for DNA replication indicate that the sequence upstream of the late gene contains cis-acting transcriptional regulatory signals.

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