The B subunit of unknown Class III extradiol dioxygenases with similarity to Protocatechuate 4,5-dioxygenase.
This subfamily is composed of proteins of unknown function with similarity to the B subunit of Protocatechuate 4,5-dioxygenase (LigAB). LigAB belongs to the class III extradiol dioxygenase family, a group of enzymes which use a non-heme Fe(II) to cleave aromatic rings between a hydroxylated carbon and an adjacent non-hydroxylated carbon. Dioxygenases play key roles in the degradation of aromatic compounds. 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.
Jiyao W et al.(2023). "The conserved domain database in 2023.",