IUBMB Enzyme Nomenclature


Accepted name: 2-hydroxymuconate-6-semialdehyde hydrolase

Reaction: 2-hydroxymuconate-6-semialdehyde + H2O = formate + 2-oxopent-4-enoate

For diagram of reaction click here.

Glossary: 2-hydroxymuconate-6-semialdehyde = (2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate

Other name(s): 2-hydroxy-6-oxohepta-2,4-dienoate hydrolase; 2-hydroxymuconic semialdehyde hydrolase; HMSH; HOD hydrolase; xylF (gene name); 2-hydroxymuconate-semialdehyde formylhydrolase; 2-hydroxymuconate-semialdehyde hydrolase

Systematic name: 2-hydroxymuconate-6-semialdehyde formylhydrolase

Comments: The enzyme is involved in the degradation of catechols.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, UM-BBD, CAS registry number: 54004-61-4


1. Sala-Trepat, J.M. and Evans, W.C. The meta cleavage of catechol by Azotobacter species. 4-Oxalocrotonate pathway. Eur. J. Biochem. 20 (1971) 400-413. [PMID: 4325686]

2. Harayama, S., Rekik, M., Wasserfallen, A. and Bairoch, A. Evolutionary relationships between catabolic pathways for aromatics: conservtion of gene order and nucleotide sequences of catechol oxidation genes of pWW0 and NAH7 plasmids. MGG Mol. Gen. Genet. 210 (1987) 241-247. [PMID: 3481421]

3. Diaz, E. and Timmis, K.N. Identification of functional residues in a 2-hydroxymuconic semialdehyde hydrolase. A new member of the α/β hydrolase-fold family of enzymes which cleaves carbon-carbon bonds. J. Biol. Chem. 270 (1995) 6403-6411. [PMID: 7890778]

[EC created 1990, modified 2013]

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