IUBMB Enzyme Nomenclature


Accepted name: 3-hydroxy-4-methylanthranilate adenylyltransferase

Reaction: ATP + 3-hydroxy-4-methylanthranilate = diphosphate + 3-hydroxy-4-methylanthranilyl-adenylate

Other name(s): acmA (gene name); sibE (gene name); actinomycin synthase I; 4-MHA-activating enzyme; ACMS I; actinomycin synthetase I; 4-MHA pentapeptide lactone synthase AcmA

Systematic name: ATP:3-hydroxy-4-methylanthranilate adenylyltransferase

Comments: The enzyme, characterized from the bacteria Streptomyces anulatus and Streptosporangium sibiricum, activates 3-hydroxy-4-methylanthranilate, a precursor of actinomycin antibiotics and the antitumor antibiotic sibiromycin, to an adenylate form, so it can be loaded onto a dedicated aryl-carrier protein.

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


1. Pfennig, F., Schauwecker, F. and Keller, U. Molecular characterization of the genes of actinomycin synthetase I and of a 4-methyl-3-hydroxyanthranilic acid carrier protein involved in the assembly of the acylpeptide chain of actinomycin in Streptomyces. J. Biol. Chem. 274 (1999) 12508-12516. [PMID: 10212227]

2. Giessen, T.W., Kraas, F.I. and Marahiel, M.A. A four-enzyme pathway for 3,5-dihydroxy-4-methylanthranilic acid formation and incorporation into the antitumor antibiotic sibiromycin. Biochemistry 50 (2011) 5680-5692. [PMID: 21612226]

[EC created 2016]

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