Table 1. β-Galactosidase expression by E. coli strains carrying wild-type and mutant forms of DtxR grown under iron-replete and iron-limiting conditions.

	β-Galactosidase, % of control
Repressor	LB/Amp/Kan	LB/Amp/Kan + 300 μM DP
DtxR	0.32 ± 0.04	81.0 ± 2.25
DtxR(E175K)	0.25 ± 0.04	30.7 ± 1.61
DtxR(G10)	0.76 ± 0.07	95.9 ± 3.41
DtxR(G4S)2	0.43 ± 0.12	97.5 ± 5.62
DtxR(E175K,G10)	0.65 ± 0.73	22.3 ± 0.42