Predicted to enable homogentisate 1,2-dioxygenase activity and identical protein binding activity. Acts upstream of or within cellular amino acid metabolic process. Is expressed in several structures, including alimentary system; brain; genitourinary system; liver; and sensory organ. Used to study alkaptonuria. Human ortholog(s) of this gene implicated in alkaptonuria. Orthologous to human HGD (homogentisate 1,2-dioxygenase). [provided by Alliance of Genome Resources, Apr 2022]