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Iron-starved cultures of Enterobacter cloacae produced two siderophores, identified as enterochelin and aerobactin. The aerobactin was excreted in larger amounts than was enterochelin, and it was synthesized preferentially in the late logarithmic and stationary growth phases under iron-deficient conditions. Enterochelin was synthesized by cultures in the logarithmic phase of growth and preferentially in medium with 1 microM ferric chloride. Both siderophores appeared to be excreted immediately after their synthesis, since no intracellular aerobactin or enterochelin could be detected. The killing activity of the bacteriocin cloacin DF13 was inhibited by aerobactin. It was shown that aerobactin and cloacin DF13 bound to the same receptor sites located in the outer membrane. The synthesis of these receptor sites was induced by iron limitation. We conclude that the receptor for the uptake of aerobactin also functions as receptor for cloacin DF13.

Siderophore production by Enterobacter cloacae and a common receptor protein for the uptake of aerobactin and cloacin DF13