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

The DNA sequence after the well-characterized Neisseria gonorrhoeae fbp gene has two open reading frames. One is called fbpB which encodes a protein which may act as a cytoplasmic permease and the other is called fbpC which encodes a protein which may act as a nucleotide-binding protein. The fbpABC operon composes an iron transport system that is homologous to the sfu and hit operons of Serratia marcescens and Haemophilus influenzae, respectively, and exhibits elements characteristic of ATP-binding cassette transporters.