IUBMB Enzyme Nomenclature


Accepted name: 3-(3-hydroxyphenyl)propanoate hydroxylase

Reaction: (1) 3-(3-hydroxyphenyl)propanoate + NADH + H+ + O2 = 3-(2,3-dihydroxyphenyl)propanoate + H2O + NAD+
(2) (2E)-3-(3-hydroxyphenyl)prop-2-enoate + NADH + H+ + O2 = (2E)-3-(2,3-dihydroxyphenyl)prop-2-enoate + H2O + NAD+

Glossary: 3-hydroxycinnamate = 3-coumarate = 3-(3-hydroxyphenyl)prop-2-enoate

Other name(s): mhpA (gene name)

Systematic name: 3-(3-hydroxyphenyl)propanoate,NADH:oxygen oxidoreductase (2-hydroxylating)

Comments: A flavoprotein (FAD). This enzyme participates in a meta-cleavage pathway employed by the bacterium Escherichia coli for the degradation of various phenylpropanoid compounds.

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


1. Burlingame, R. and Chapman, P.J. Catabolism of phenylpropionic acid and its 3-hydroxy derivative by Escherichia coli. J. Bacteriol. 155 (1983) 113-121. [PMID: 6345502]

2. Burlingame, R.P., Wyman, L. and Chapman, P.J. Isolation and characterization of Escherichia coli mutants defective for phenylpropionate degradation. J. Bacteriol. 168 (1986) 55-64. [PMID: 3531186]

3. Ferrández, A., García, J.L. and Díaz, E. Genetic characterization and expression in heterologous hosts of the 3-(3-hydroxyphenyl)propionate catabolic pathway of Escherichia coli K-12. J. Bacteriol. 179 (1997) 2573-2581. [PMID: 9098055]

4. Díaz, E., Ferrández, A. and García, J.L. Characterization of the hca cluster encoding the dioxygenolytic pathway for initial catabolism of 3-phenylpropionic acid in Escherichia coli K-12. J. Bacteriol. 180 (1998) 2915-2923. [PMID: 9603882]

[EC created 2011]

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