Aminotransfer reaction between an amino acid and an alpha-keto acid. The amino (NH2) group and the keto (=O) group are exchanged.<unk> s or aminotransferases are enzymes that catalyze a transamination reaction between an amino acid and an α-keto acid. They are important in the synthesis of amino acids, which form proteins.
Transaminase
Amidase
Aldehyde dehydrogenase
Xanthine oxidase
Biotinidase
Proteases 
Alanine transaminase
Pegaspargase