FIG. 1.

Genetic organization of the Y. pestis yfuABC operon and similarities to selected iron ABC transport systems. (A) Relevant genes and restriction sites of Y. pestis DNA in pYFU1. Base pair numbering is shown on the top line. A putative Fur binding sequence (FBS) is 95 bp from the start of yfuA. For YfuA, the unprocessed and processed molecular masses (MW) and pIs are given. Y. pestis DNA present in pYFU2 and pYFU3 are indicated by the lines shown. (B) Percent identity/similarity to each of four iron ABC transport systems is shown below the corresponding Y. pestis gene.