Aromatic-ring-hydroxylating dioxygenase, alpha subunit, C-terminal domain (IPR015879)

Short name: Ring_hydroxy_dOase_asu_C_dom

Domain relationships



Aromatic ring hydroxylating dioxygenases are multicomponent 1,2-dioxygenase complexes that convert closed-ring structures to non-aromatic cis-diols [PMID: 1885518]. The complex has both hydroxylase and electron transfer components. The hydroxylase component is itself composed of two subunits: an alpha-subunit of about 50 kDa, and a beta-subunit of about 20 kDa. The electron transfer component is either composed of two subunits: a ferredoxin and a ferredoxin reductase or by a single bifunctional ferredoxin/reductase subunit. Sequence analysis of hydroxylase subunits of ring hydroxylating systems (including toluene, benzene and napthalene 1,2-dioxygenases) suggests they are derived from a common ancestor [PMID: 1885518]. The alpha-subunit binds both a Rieske-like 2Fe-2S cluster and an iron atom: conserved Cys and His residues in the N-terminal region may provide 2Fe-2S ligands, while conserved His and Tyr residues may coordinate the iron. The beta subunit may be responsible for the substrate specificity of the dioxygenase system [PMID: 1885518].

This entry represents the conserved C-terminal domain found in the alpha subunit of aromatic-ring-hydroxylating dioxygenases. It is the catalytic domain of aromatic-ring- hydroxylating dioxygenase systems. The active site contains a non-heme ferrous ion coordinated by three ligands.

GO terms

Biological Process

GO:0019439 aromatic compound catabolic process
GO:0055114 oxidation-reduction process

Molecular Function

GO:0051537 2 iron, 2 sulfur cluster binding
GO:0005506 iron ion binding
GO:0016708 oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, NAD(P)H as one donor, and incorporation of two atoms of oxygen into one donor

Cellular Component

No terms assigned in this category.

Contributing signatures

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