Table 4.

Effects of t-BOOH or cadmium on dissociation of σ^E-ChrR complexes in vivo¹

Cadmium (µM)	Before Cadmium	After Cadmium	Fold Change
0	4.5 ± 1.1	4.8 ± 1.8	1.1
20	4.0 ± 0.5	4.6 ± 1.2	1.2
100	4.1 ± 0.9	4.7 ± 1.3	1.2
1000	4.7 ± 0.2	4.3 ± 1.1	0.9

t-BOOH (µM)	Before t-BOOH	After t-BOOH	Fold Change
100	4.5 ± 0.5	17.6 ± 0.9	3.9

¹Shown are the differential rates of β-galactosidase synthesis measured from an rpoE∷lacZ operon fusion that requires σ^E in wild type R. sphaeroides 2.4.1 cells before or after addition of the indicated concentration of cadmium sulfate or t-BOOH. The column labeled fold change reports the ratio of these rates before and after cadmium sulfate addition.