FIG. 6.

Schematics summarizing features in DNA and RNA promoters. (A) The BMV subgenomic core promoter and initiation site. Nucleotides required for recognition by the BMV RdRp are boxed; the base moieties important for the recognition by RdRp (28) are shown above and below the boxes. The arrow denotes the initiation nucleotide. (B) Consensus promoter recognized by the T7 RNA polymerase (24) and the influenza virus promoter for minus-strand RNA synthesis (6). The nucleotides important for polymerase specificity are boxed, and the nucleotides determined to be contacted by the respective polymerases are in boldface. An arrow is placed over the initiation nucleotide to denote the direction of RNA synthesis.