Definition of phenylalanine in English:



mass nounBiochemistry
  • An amino acid widely distributed in plant proteins. It is an essential nutrient in the diet of vertebrates.

    Chemical formula: C₆H₅CH₂CH(NH₂)COOH

    • ‘Aspartame is made up of two amino acids: phenylalanine and aspartic acid.’
    • ‘In addition to the DNA-binding motif and the ATP binding site, TyrR contains binding sites for the aromatic amino acids tyrosine and phenylalanine.’
    • ‘Like its amino-acid sister phenylalanine, tyrosine is a key nutrient that your body can use to restock NE stores depleted by ephedrine.’
    • ‘Trypsin favors basic residues like lysine and arginine; chymotrypsin favors aromatic residues like phenylalanine, tyrosine, and tryptophan.’
    • ‘The amino acids tyrosine and phenylalanine are the building materials for catecholamines, which are used as source material for both neurotransmitters and for hormones.’