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In enzymology, a protocatechuate 3,4-dioxygenase (EC 1.13.11.3) is an enzyme that catalyzes the chemical reaction:3,4-dihydroxybenzoate + O2? 3-carboxy-cis,cis-muconate.
https://www.creative-enzymes.com/similar/Protocatechuate-3-4dioxygenase_615.html