TABLE 3.

Complementation of E. coli mutants of ferric enterochelin esterase (AN272 fes) and ferric enterochelin permease (AB1515.718 fepD and AB1515.764 fepG)^a

Plasmid used for complementation	Complementation of mutant at concn (μM) of 2,2′-dipyridyl
	AN272 fes, 200	AB1515.718 fepD and AB1515.764 fepG
		100	200
pACYC184	φ	φ	φ
pBluescript KS(+)	φ	φ	φ
pSI10	+	+	φ
pH-1	+	+	φ
pH-1fes::Tn552kan	φ	ND	ND
pH-1fepD::Tn552kan	ND	φ	φ

^aLack of complementation (φ) or positive complementation (+) by the bioassay as described in Materials and Methods. ND, not determined.