A pyridoxal-phosphate protein. Also acts on L-tyrosine, L-phenylalanine and L-tryptophan. Aspartate transaminase activity can be formed from the aromatic-amino-acid transaminase (EC
2.6.1.57) of Escherichia coli by controlled proteolysis [7], some EC
2.6.1.57 activity can be found in this enzyme from other sources [8]; indeed the enzymes are identical in Trichomonas vaginalis [6].