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The TonB‐dependent ferrichrome receptor FcuA of Yersinia enterocolitica: evidence against a strict co‐evolution of receptor structure and substrate specificity

A Yersinia enterocolitica receptor mutant was isolated which is impaired in ferrichrome uptake. The receptor‐encoding gene fcuA was cloned in Escherichia coli K‐12. A fcuA mutant of Y. enterocolitica could be complemented by the cloned DNA fragment. The FcuA‐encoding region was sequenced and an open reading frame encoding 758 amino acids including a signal sequence of 36 amino acids was found. FcuA shared 34.6% amino acid sequence homology with FatA, the anguibactin receptor of Vibrio anguillarum, but only 20.6% homology with FhuA, the ferrichrome receptor of E. coli Since the structure of anguibactin differs strongly from that of ferrichrome there seems to be no co‐evolution of receptor structure and substrate specificity.