Involved in the gamma-resorcylate (2,6-dihydroxybenzoate) catabolism (PubMed:17158677). Catalyzes the conversion of hydroxyquinol to malelylacetate (PubMed:17158677). benzene-1,2,4-triol + O2 = 2 H(+) + maleylacetate Binds 1 Fe(3+) ion per subunit. Aromatic compound metabolism. Induced in the presence of gamma-resorcylate. Belongs to the intradiol ring-cleavage dioxygenase family.