IUBMB Enzyme Nomenclature


Accepted name: ABC-type ferric citrate transporter

Reaction: ATP + H2O + Fe3+-dicitrate-[dicitrate-binding protein][side 1] = ADP + phosphate + Fe3+-dicitrate[side 2] + [dicitrate-binding protein][side 1]

Other name(s): ferric citrate transporting ATPase; ferric citrate ABC transporter; fecBCDE (gene names)

Systematic name: ATP phosphohydrolase (ABC-type, iron(III) dicitrate-importing)

Comments: An ATP-binding cassette (ABC) type transporter, characterized by the presence of two similar ATP-binding domains/proteins and two integral membrane domains/proteins. The enzyme from Escherichia coli interacts with a periplasmic substrate binding protein and mediates the high affinity uptake of Fe3+-citrate in the form of a mononuclear (containing one iron(III) ion and two citrate molecules) or dinuclear (containing 2 iron(III) ions) complexes.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Staudenmaier, H., Van Hove, B., Yaraghi, Z. and Braun, V. Nucleotide sequences of the fecBCDE genes and locations of the proteins suggest a periplasmic-binding-protein-dependent transport mechanism for iron(III) dicitrate in Escherichia coli. J. Bacteriol. 171 (1989) 2626-2633. [PMID: 2651410]

2. Banerjee, S., Paul, S., Nguyen, L.T., Chu, B.C. and Vogel, H.J. FecB, a periplasmic ferric-citrate transporter from E. coli, can bind different forms of ferric-citrate as well as a wide variety of metal-free and metal-loaded tricarboxylic acids. Metallomics 8 (2016) 125-133. [PMID: 26600288]

[EC created 2000 as EC, part transferred 2018 to EC]

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