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Four chromosomal genes, tonA (fhuA), fhuB, tonB, and exbB, were required for the transport of iron(III)-aerobactin specified by the plasmids ColV-K311, ColV-K229, ColV-K328, and ColV-K30. These genes also determine the transport system in Escherichia coli for the iron ionophore ferrichrome. Aerobactin and ferrichrome are both iron ligands of the hydroxamate type, but they are of different structure. The ColV plasmids determine an outer membrane protein that serves as a receptor for cloacin. Cloacin-resistant mutants were devoid of iron(III)-aerobactin transport but were unimpaired in ferrichrome transport. We conclude that for iron(III)-aerobactin transport two outer membrane proteins, the TonA and the cloacin receptor protein, have to interact functionally or structurally or both.

Chromosomal genes for ColV plasmid-determined iron(III)-aerobactin transport in Escherichia coli