FIG. 1.

Schematic representation of the RTA-responsive region of the K9 (vIRF) promoter. The positions of sequence fragments used in the present study with the upstream sequence of K9 (vIRF) are indicated. The numbers above the sequence indicate the positions of the nucleotides marked with a dot and are relative to the K9 mRNA start site in the lytic phase (10). Variously shaded bars such as RE I-1, RE I-2, and so on shows the regions described in the present study. The line under the boxes depicts the shorter fragments of each RE. Nucleotides surrounded by a dotted box show putative AP1 and/or SP1 recognition sites, as shown above the line. Previously identified responsive regions. RE I and RE II lie between deletion mutants D4 and D5 and between deletion mutants D8 and D9, respectively, as described elsewhere (10). The RE III region is shown in the hatched box.