Opens the cyclic ring of caffealdehyde between carbons 2 and 3 or between carbons 4 and 5. Involved in the biosynthesis of arabidopyrones. Binds 1 zinc ion per subunit. Expressed in seedlings, roots, leaves, stems and flowers. Deficient in arabidopyrones. Arabidopyrones are derived from phenylalanine instead of tyrosine like other ring-cleavage-derived plant metabolites. Belongs to the DODA-type extradiol aromatic ring-opening dioxygenase family. The predicted gene At1g03900 has been split into 2 genes: At4g15090 and At4g15093. The predicted gene At1g03900 has been split into 2 genes: At4g15090 and At4g15093.