3,4-dihydroxyphenylacetate 2,3-dioxygenase

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3,4-dihydroxyphenylacetate 2,3-dioxygenase
EC number
CAS number 37256-56-7
IntEnz IntEnz view
ExPASy NiceZyme view
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO

In enzymology, a 3,4-dihydroxyphenylacetate 2,3-dioxygenase (EC is an enzyme that catalyzes the chemical reaction

3,4-dihydroxyphenylacetate + O2 2-hydroxy-5-carboxymethylmuconate semialdehyde

Thus, the two substrates of this enzyme are 3,4-dihydroxyphenylacetate and O2, whereas its product is 2-hydroxy-5-carboxymethylmuconate semialdehyde.

This enzyme belongs to the family of oxidoreductases, specifically those acting on single donors with O2 as oxidant and incorporation of two atoms of oxygen into the substrate (oxygenases). The oxygen incorporated need not be derived from O2. The systematic name of this enzyme class is 3,4-dihydroxyphenylacetate:oxygen 2,3-oxidoreductase (decyclizing). Other names in common use include 3,4-dihydroxyphenylacetic acid 2,3-dioxygenase, HPC dioxygenase, and homoprotocatechuate 2,3-dioxygenase. This enzyme participates in tyrosine metabolism. It employs one cofactor, iron.

Structural studies[edit]

As of late 2007, 8 structures have been solved for this class of enzymes, with PDB accession codes 1F1R, 1F1U, 1F1V, 1F1X, 1Q0C, 1Q0O, 2IG9, and 2IGA.