IUBMB Enzyme Nomenclature


Accepted name: salicylate—[aryl-carrier protein] ligase

Reaction: ATP + salicylate + holo-[non-ribosomal peptide synthase] = AMP + diphosphate + salicyl-[non-ribosomal peptide synthase] (overall reaction)
(1a) ATP + salicylate = diphosphate + (salicyl)adenylate
(1b) (salicyl)adenylate + holo-[non-ribosomal peptide synthase] = AMP + salicyl-[non-ribosomal peptide synthase]

Other name(s): pmsE (gene name); pchD (gene name)

Systematic name: salicylate:holo-[non-ribosomal peptide synthase] ligase

Comments: The enzyme catalyses the activation of salicylate to (salicyl)adenylate, followed by the transfer of the activated compound to the free thiol of a phosphopantetheine arm of an aryl-carrier protein, which is often a domain of a larger non-ribosimal peptide synthase. The PmsE enzyme is involved in pseudomonine biosynthesis and transfers the activated salicylate first to itself, and then to a PmsG protein. The PchD enzyme is involved in pyochelin biosynthesis and transfers the activated salicylate directly to the PchE protein.

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


1. Quadri, L.E., Keating, T.A., Patel, H.M. and Walsh, C.T. Assembly of the Pseudomonas aeruginosa nonribosomal peptide siderophore pyochelin: In vitro reconstitution of aryl-4, 2-bisthiazoline synthetase activity from PchD, PchE, and PchF. Biochemistry 38 (1999) 14941-14954. [PMID: 10555976]

2. Sattely, E.S. and Walsh, C.T. A latent oxazoline electrophile for N-O-C bond formation in pseudomonine biosynthesis. J. Am. Chem. Soc. 130 (2008) 12282-12284. [PMID: 18710233]

[EC created 2019]

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