FIG. 1.

The pvdE-pvdF intergenic promoter region. The DNA sequence and the location of the pvdE IS box and the pvdE transcript start site have been described previously (20), and the sequence has been deposited with GenBank (accession no. U07359). The positions of the pvdF IS box and pvdF transcription start site (this work) are also shown. Numbering above the sequence is relative to the pvdF transcript start site, while numbering below the sequence is relative to the pvdE transcript start site. Mutations that were created at the IS box elements (see text) are shown in boldface underneath the wild-type sequences.