TABLE 4.

Production of mycobactin grown under iron-deplete and -replete conditions^a

Strain	Relevant genotype	Mycobactin production (mg of mycobactin/g [wet wt] of cells)			Exochelin productionb
		MM plus dipyridyl	MM	MM plus iron
mc2155	fxbA+fxbB+fxbC+	3.69 ± 0.57	1.63 ± 0.48	0.23 ± 0.21	1.11 ± 0.05
mc21608	fxbB21::Tn10	7.12 ± 1.05	4.61 ± 0.86	0.32 ± 0.20	0.30 ± 0.10
mc21609	fxbC22::Tn10	3.75 ± 0.68	2.53 ± 0.77	0.32 ± 0	0.18 ± 0.08
mc21610	fxbB21::Tn10/pYUB563	3.44 ± 0.44	2.81 ± 0.37	0.30 ± 0.27	1.16 ± 0.11
mc21611	fxbC22::Tn10/pYUB563	2.49 ± 0.07	1.68 ± 0.11	0.27 ± 0.32	1.13 ± 0.10

^aThe bacteria were grown for 3 days in MM alone or MM supplemented with 50 μM 2,2′-dipyridyl (iron deplete) or with 50 μM iron (iron replete). The data are from a single experiment performed in triplicate and are representative of three separate experiments. 

^bExochelin production (measured by the change in optical density at 630 nm per milliliter) for cells grown in MM.