The bacterial enzyme (characterized from an unidentified denitrifying bacterium) is involved in an anaerobic toluene degradation pathway. The plant enzyme is involved in formation of 4-hydroxybenzoate, a cell wall-bound phenolic acid that plays a major role in plant defense against pathogens. cf. EC 18.104.22.168, 4-hydroxybenzaldehyde dehydrogenase (NADP+).
Bossert, I.D., Whited, G., Gibson, D.T. and Young, L.Y. Anaerobic oxidation of p-cresol mediated by a partially purified methylhydroxylase from a denitrifying bacterium. J. Bacteriol.171 (1989) 2956–2962. [PMID: 2722739]
Sircar, D. and Mitra, A. Evidence for p-hydroxybenzoate formation involving enzymatic phenylpropanoid side-chain cleavage in hairy roots of Daucus carota. J. Plant Physiol.165 (2008) 407–414. [PMID: 17658659]