Figure 4

Deletion analysis of the recA regulatoryregion. The various plasmids carrying the recA promoter region translationally fused to the gusA gene and the β-glucuronidase activities obtained from cells containing those plasmids grown without and with sublethal concentration (200 ng/ml) of mitomycin C [10] are reported. For each plasmid transcriptional and translational start points are indicated. The extension of S. thermophilus DNA carried by each plasmid is indicated referring to the transcriptional start point as +1. Enzymatic data are the average of three independent experiments.