FIG. 2.

Nucleotide sequence around the nasR control region. Numbering is with respect to the transcription initiation site (+1). A ς^N promoter consensus sequence (34) is shown below the nasR promoter sequence (R = purine, Y = pyrimidine, and W = A or T). The deletion endpoints of lacZ fusion constructs are indicated (see also Fig. 1). Site-specific mutational changes are shown above the sequence. The Shine-Dalgarno regions for the nasR and ychN genes are underlined. Hypothetical nasR initiation codons (encoding Met-1, Met-4, and Val-11) are also underlined; see the text for details. The ychN gene is in the opposite orientation from the nasR gene. Deduced amino acid sequences are shown in standard single-letter code.