TYR is found in 108237 entries

TYR in polymers: 108183 entries. Examples include: 101M, 102L, 102M

TYR as free ligands, exist in 54 entries. Examples include 1DGI, 1FE1, 1J1U

Find related ligands: Stereoisomers Similar ligands Chemical Structure Search

View summary at Ligand Expo

Chemical Component Summary

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 N[C@@H](Cc1ccc(O)cc1)C(O)=O
InChI InChI=1S/C9H11NO3/c10-8(9(12)13)5-6-1-3-7(11)4-2-6/h1-4,8,11H,5,10H2,(H,12,13)/t8-/m0/s1

Chemical Details

Formal Charge 0
Atom Count 24
Chiral Atom Count 1
Chiral Atoms CA
Bond Count 24
Aromatic Bond Count 6
Leaving Atoms OXT H2 HXT

Drug Info: DrugBank

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
  • Aminosyn 10%
  • Aminosyn 5%
  • Aminosyn 7%
  • Aminosyn 8.5%
  • Travasol
  • Vamin 18 Electrolyte-free
  • Rxosine
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.
Route of administration intravenous
  • Dietary Supplements
  • Micronutrients
  • Supplements
  • Non-Essential Amino Acids
CAS number 60-18-4
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID: 21059682