Involved in resorcinol degradation (Ref.2, PubMed:16963551). Catalyzes the conversion of hydroxyquinol to malelylacetate (Ref.2, PubMed:16963551). Shows also weak activity with catechol, 3-methylcatechol and 4-methylcatechol, but cannot use 4-chlorocatechol, 4-nitrocatechol or protocatechuate (Ref.2). benzene-1,2,4-triol + O2 = 2 H(+) + maleylacetate Binds 1 Fe(3+) ion per subunit. Aromatic compound metabolism. Belongs to the intradiol ring-cleavage dioxygenase family.