IUBMB Enzyme Nomenclature


Accepted name: ABC-type ferric hydroxamate transporter

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

Other name(s): iron(III) hydroxamate transporting ATPase; iron(III) hydroxamate ABC transporter; fhuCDB (gene names)

Systematic name: ATP phosphohydrolase [ABC-type, iron(III) hydroxamate-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. A bacterial enzyme that interacts with an extracytoplasmic substrate binding protein and mediates the import of Fe3+-complexed hydroxamate siderophores such as coprogen, ferrichrome and the ferric hydroxamate antibiotic, albomycin.

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


1. Koster, W. Iron(III) hydroxamate transport across the cytoplasmic membrane of Escherichia coli. Biol. Met. 4 (1991) 23-32. [PMID: 1830209]

2. Speziali, C.D., Dale, S.E., Henderson, J.A., Vines, E.D. and Heinrichs, D.E. Requirement of Staphylococcus aureus ATP-binding cassette-ATPase FhuC for iron-restricted growth and evidence that it functions with more than one iron transporter. J. Bacteriol. 188 (2006) 2048-2055. [PMID: 16513734]

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

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