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Functional complementation of E. coli SAB11 by the S. typhimurium sit operon. The indicated strains were grown on Curtiss’s minimal agar plates in the presence or absence of citrate. Growth plates after 3 days of incubation at 37°C are shown. The enterobactin-deficient E. coli SAB11 carried either no plasmid, pSB998 (which contains the S. typhimurium sti operon), or the plasmid vector pWKS30. The enterobactin-proficient HB101 strain was included as positive control.
