FIG. 3.

Comparative antibacterial activities of MccE492 (black bars), MccM (gray bars), and MccH47 (white bars) against wild-type and mutant strains. Antibacterial activity is expressed by the size (in mm) of the inhibition halo. Values are presented as the means of three independent experiments with standard errors. (A) Antibacterial activity against gram-negative bacterial strains of different genera (E. coli, K. pneumoniae, Salmonella enterica, Enterobacter cloacae); (B) antibacterial activity against isogenic strains carrying mutations affecting the siderophore receptors FepA, Fiu, and Cir and associated proteins TonB, ExbB, and ExbD. The limit of detection (inhibition halo of 5 mm) is indicated by a broken line.