Literature citations

A tandemly-oriented late gene cluster within the vaccinia virus genome.

The nucleotide sequence of a 5.1 kilobase-pair fragment from the central portion of the vaccinia virus genome has been determined. Within this region, five complete and two incomplete open reading frames (orfs) are tightly-clustered, tandemly-oriented, and read in the leftward direction. Late mRNA start sites for the five complete orfs and one incomplete orf were determined by S1 nuclease mapping. The two leftmost complete orfs correlated with late polypeptides of 65,000 and 32,000 molecular weight previously mapped to this region. When compared with each other and with sequences present in protein data banks, the five complete orfs showed no significant homology matches amongst themselves or any previously reported sequence. The six putative promoters were aligned with three previously sequenced late gene promoters. While all of the nine are A-T rich, the only apparent consensus sequence is TAA immediately preceeding the initiator ATG. Identification of this tandemly-oriented late gene cluster suggests local organization of the viral genome.

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