TABLE 3.
Specificity of expression of β-galactosidase activity from the promoter regions of cadA and cadR in wild-type 06909 with different metal ions
| Metal | Concn (μM) | β-Galactosidase activity (Miller units)a with plasmid:
|
||
|---|---|---|---|---|
| pRKL1 | pRCD31 (PcadA) | pRCD32 (PcadR) | ||
| No metal | 196 | 690 | 735 | |
| CdCl2 · 2.5H2O | 12.5 | 235 | 8,417 | 1,652 |
| CuSO4 · 5H2O | 25 | NT | 802 | 656 |
| ZnSO4 · 7H2O | 50 | NT | 1,015 | 745 |
| ZnSO4 · 7H2O | 500 | NT | 1,531 | NT |
| HgCl2 | 0.5 | NT | 1,007 | 592 |
| CoCl2 · 6H2O | 5 | NT | 709 | 493 |
| NiSO4 | 10 | NT | 683 | 639 |
| MnCl2 · 4H2O | 25 | NT | 761 | 605 |
| Pb(C2H3O2) · 3H2O | 10 | NT | 1,033 | 672 |
| Pb(C2H3O2) · 3H2O | 500 | NT | 3,250 | NT |
a
NT, not tested.