- u. hydratase an enzyme catalyzing the reaction of water with urocanic acid to produce 4-imidazolone-5-propionic acid, a step in l-histidine catabolism; this enzyme is absent in cases of urocanic aciduria. SYN: urocanase.
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uro·can·ate (u″ro-kanґat) the anionic form of urocanic acid.Medical dictionary. 2011.