IUBMB Enzyme Nomenclature


Accepted name: D-ornithine—citrate ligase

Reaction: ATP + D-ornithine + citrate = AMP + diphosphate + N5-[(S)-citryl]-D-ornithine

For diagram of reaction, click here

Glossary: staphyloferrin A = N2-[(R)-citryl],N5-[(S)-citryl]-D-ornithine

Other name(s): sfnaD (gene name)

Systematic name: D-ornithine:citrate ligase {3-[(2-aminopentan-5-oylcarbamoyl)methyl]-3-hydroxybutanoate-forming}

Comments: Requires Mg2+. The enzyme, characterized from the bacterium Staphylococcus aureus, is involved in the biosynthesis of the siderophore staphyloferrin A. It belongs to a class of siderophore synthases known as type A nonribosomal peptide synthase-independent synthases (NIS). Type A NIS enzymes are responsible for the formation of amide or ester bonds between polyamines or amino alcohols and a prochiral carboxyl group of citrate. The enzyme forms a citrate adenylate intermediate prior to ligation.

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


1. Cotton, J.L., Tao, J. and Balibar, C.J. Identification and characterization of the Staphylococcus aureus gene cluster coding for staphyloferrin A. Biochemistry 48 (2009) 1025-1035. [PMID: 19138128]

[EC created 2019]

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