||Part of the multicomponent 3-phenylpropionate dioxygenase, that converts 3-phenylpropionic acid (PP) and cinnamic acid (CI) into 3-phenylpropionate-dihydrodiol (PP-dihydrodiol) and cinnamic acid-dihydrodiol (CI-dihydrodiol), respectively.
||Reduced ferredoxin + NAD(+) = oxidized ferredoxin + NADH.
||Aromatic compound metabolism; 3-phenylpropanoate degradation.
||This dioxygenase system consists of four proteins: the two subunits of the hydroxylase component (HcaE and HcaF), a ferredoxin (HcaC) and a ferredoxin reductase (HcaD).
||Belongs to the bacterial ring-hydroxylating dioxygenase ferredoxin reductase family.