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Protocatechuate 3,4-dioxygenase (3,4-PCD) catalyzes the oxidative ring cleavage of 3,4-dihydroxybenzoate to produce beta-carboxy-cis,cis-muconate. 3,4-PCDs are large aggregates of 12 protomers, each composed of an alpha- and beta-subunit and an Fe3+ ion bound in the beta-subunit at the alpha-beta-subunit interface. 3,4-PCD is a member of the aromatic dioxygenases which are non-heme iron intradiol-cleaving enzymes that break the C1-C2 bond and utilize Fe3+.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",