In enzymology, an aromatic-amino-acid transaminase (EC 2.6.1.57) is an enzyme that catalyzes the chemical reaction Thus, the two substrates of this enzyme are aromatic amino acid and 2-oxoglutarate, whereas its two products are aromatic oxo acid and L-glutamate.
This enzyme belongs to the family of transferases, specifically the transaminases, which transfer nitrogenous groups.
The systematic name of this enzyme class is aromatic-amino-acid:2-oxoglutarate aminotransferase.
Other names in common use include aromatic amino acid aminotransferase, aromatic aminotransferase, and ArAT.
As of late 2007, 13 structures have been solved for this class of enzymes, with PDB accession codes 1AY4, 1AY5, 1AY8, 2AY1, 2AY2, 2AY3, 2AY4, 2AY5, 2AY6, 2AY7, 2AY8, 2AY9, and 3TAT.