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TYR is found in 106109 entries
  •   Chemical Component Summary   Hide
    Identifiers L-tyrosine
    (2S)-2-amino-3-(4-hydroxyphenyl)propanoic acid
    Formula C9 H11 N O3
    Molecular Weight 181.19 g/mol
    Type L-peptide linking
    Isomeric SMILES
  •   Drug Info: DrugBank Hide
    DrugBank ID DB00135   (Stereoisomeric match)
    Name L-Tyrosine
    • approved
    • nutraceutical
    Description A non-essential amino acid. In animals it is synthesized from phenylalanine. It is also the precursor of epinephrine; thyroid hormones; and melanin. [PubChem]
    • (-)-alpha-amino-P-Hydroxyhydrocinnamic acid
    • (−)-α-amino-p-hydroxyhydrocinnamic acid
    • (2S)-2-amino-3-(4-hydroxyphenyl)propanoic acid
    • (S)-(-)-Tyrosine
    • (S)-2-Amino-3-(p-hydroxyphenyl)propionic acid
    • (S)-3-(p-Hydroxyphenyl)alanine
    • (S)-alpha-amino-4-Hydroxybenzenepropanoic acid
    • (S)-Tyrosine
    • (S)-α-amino-4-hydroxybenzenepropanoic acid
    • 4-hydroxy-L-phenylalanine
    • L-Tyrosin
    • L-Tyrosine
    • Tyr
    • Y
    Brand names
    Affected organism Humans and other mammals
    Indication Tyrosine is claimed to act as an effective antidepressant, however results are mixed. Tyrosine has also been claimed to reduce stress and combat narcolepsy and chronic fatigue, however these claims have been refuted by some studies.
    Pharmacology Tyrosine is a nonessential amino acid synthesized in the body from phenylalanine. Tyrosine is critical for the production of the body's proteins, enzymes and muscle tissue. Tyrosine is a precursor to the neurotransmitters norepinephrine and dopamine. It can act as a mood elevator and an anti-depressant. It may improve memory and increase mental alertness. Tyrosine aids in the production of melanin and plays a critical role in the production of thyroxin (thyroid hormones). Tyrosine deficiencies are manifested by hypothyroidism, low blood pressure and low body temperature. Supplemental tyrosine has been used to reduce stress and combat narcolepsy and chronic fatigue.
    Mechanism of action Tyrosine is produced in cells by hydroxylating the essential amino acid phenylalanine. This relationship is much like that between cysteine and methionine. Half of the phenylalanine required goes into the production of tyrosine; if the diet is rich in tyrosine itself, the requirements for phenylalanine are reduced by about 50%. The mechanism of L-tyrosine's antidepressant activity can be accounted for by the precursor role of L-tyrosine in the synthesis of the neurotransmitters norepinephrine and dopamine. Elevated brain norepinephrine and dopamine levels are thought to be associated with antidepressant effects.
    • Dietary Supplements
    • Micronutrients
    • Supplements
    • Non-Essential Amino Acids
    CAS number 60-18-4
    Name Sequence search Pharmacological action Actions
    Tyrosine--tRNA ligase, cytoplasmic   Search  unknown
    Tyrosine--tRNA ligase, mitochondrial   Search  unknown
    Tyrosine 3-monooxygenase   Search  unknown binder
    Tyrosine aminotransferase   Search  unknown
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