IUBMB Enzyme Nomenclature


Accepted name: 3-amino-5-hydroxybenzoate synthase

Reaction: 5-amino-5-deoxy-3-dehydroshikimate = 3-amino-5-hydroxybenzoate + H2O

For diagram of reaction click here.

Other name(s): AHBA synthase; rifK (gene name)

Systematic name: 5-amino-5-deoxy-3-dehydroshikimate hydro-lyase (3-amino-5-hydroxybenzoate-forming)

Comments: A pyridoxal 5'-phosphate enzyme. The enzyme from the bacterium Amycolatopsis mediterranei participates in the pathway for rifamycin B biosynthesis. The enzyme also functions as a transaminase earlier in the pathway, producing UDP-α-D-kanosamine [3].

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


1. Kim, C.G., Yu, T.W., Fryhle, C.B., Handa, S. and Floss, H.G. 3-Amino-5-hydroxybenzoic acid synthase, the terminal enzyme in the formation of the precursor of mC7N units in rifamycin and related antibiotics. J. Biol. Chem. 273 (1998) 6030-6040. [PMID: 9497318]

2. Eads, J.C., Beeby, M., Scapin, G., Yu, T.W. and Floss, H.G. Crystal structure of 3-amino-5-hydroxybenzoic acid (AHBA) synthase. Biochemistry 38 (1999) 9840-9849. [PMID: 10433690]

3. Floss, H.G., Yu, T.W. and Arakawa, K. The biosynthesis of 3-amino-5-hydroxybenzoic acid (AHBA), the precursor of mC7N units in ansamycin and mitomycin antibiotics: a review. J. Antibiot. (Tokyo) 64 (2011) 35-44. [PMID: 21081954]

[EC created 2013]

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