Subunit B of the Class III Extradiol ring-cleavage dioxygenase, 3-O-Methylgallate Dioxygenase, which catalyzes the oxidization and subsequent ring-opening of 3-O-Methylgallate.
3-O-Methylgallate Dioxygenase catalyzes the oxidization and subsequent ring-opening of 3-O-Methylgallate (3MGA) between carbons 2 and 3. 3-O-Methylgallate Dioxygenase is a key enzyme in the syringate degradation pathway, in which the syringate is first converted to 3-O-Methylgallate by O-demethylase. This enzyme is a member of the class III extradiol dioxygenase family, a group of enzymes which uses a non-heme Fe(II) to cleave aromatic rings between a hydroxylated carbon and an adjacent non-hydroxylated carbon. LigAB-like enzymes are usually composed of two subunits, designated A and B, which form a tetramer composed of two copies of each subunit. This model represents the catalytic subunit, B.
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