Nucleotide sequence of the promoter region of empA. The 5'-coding sequence and immediate upstream/promoter sequence of empA is presented. The base-paired sequence indicates the annealed primers empA3W and empA3C (Table 2). The transcriptional start site is indicated by +1, the rpoS-dependent promoter regions are indicated as -10 and -35 with the bases in italics , and the lux box-like element  is underlined. Additionally, the start translation site (ATG) is in bold with the translated product below and the ribosome binding site (RBS) is marked above (*).