TABLE 3.
Promoter activity and autoregulation of the ccdF and ccdO157 systems
| OP::lacZ fusion and | β-Galactosidase sp act (Miller units) (mean ± SD)a |
|---|---|
| corresponding operon | |
| pJL-OPccdF pKT279 | 233 ± 11.83 (1) |
| pJL-OPccdF pKTccdF | 22 ± 0.76 (0.09) |
| pJL-OPccdO157 pKT279 | 46 ± 0.97 (1) |
| pJL-OPccdO157 pKTccdO157 | 17 ± 1.96 (0.37) |
a
β-galactosidase-specific activity of the OP::lacZ fusions in the presence of the corresponding operon in trans was normalized to that obtained with the control vector (shown in parentheses). Values correspond to the means of results for three experiments ± standard deviations.