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We have determined that the DNA sequence downstream of the well-characterized gonococcal fbp gene contains two open reading frames: one designated fbpB, which encodes a protein proposed to function as a cytoplasmic permease, and one designated fbpC, which encodes a protein proposed to function as a nucleotide-binding protein. The fpbABC operon composes an iron transport system that is homologous to the sfu and hit operons previously reported for Serratia marcescens and Haemophilus influenzae, respectively, and displays elements characteristic of ATP binding cassette transporters. The fpbABC operon differs from these loci in that it is lethal when overexpressed in Escherichia coli.

The fbpABC locus of Neisseria gonorrhoeae functions in the periplasm-to-cytosol transport of iron