Protocatechuate 4,5-dioxygenase beta chain (IPR034937)

Short name: PCA_45_Dioxygenase_B

Overlapping homologous superfamilies


Family relationships



Protocatechuate 4,5-dioxygenase (LigAB) catalyzes the oxidization and subsequent ring-opening of protocatechuate (or 3,4-dihydroxybenzoic acid, PCA), an intermediate in the breakdown of lignin and other compounds [PMID: 2185230]. Protocatechuate 4,5-dioxygenase is an aromatic ring opening dioxygenase belonging to the class III extradiol enzyme family, a group of enyzmes that cleaves aromatic rings between a hydroxylated carbon and an adjacent non-hydroxylated carbon using a non-heme Fe(II) [PMID: 16849108]. LigAB is composed of two subunits, designated A and B, which form a tetramer composed of two copies of each subunit. The B subunit (LigB) is the catalytic subunit of LigAB [PMID: 10467151].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0018579 protocatechuate 4,5-dioxygenase activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.