TRP is found in 114753 entries

TRP in polymers: 114618 entries. Examples include: 101M, 102L, 102M

TRP as free ligands, exist in 135 entries. Examples include 1C95, 1C9S, 1CO0

Find related ligands: Stereoisomers Similar ligands Chemical Structure Search

View summary at Ligand Expo

Chemical Component Summary

Identifiers L-tryptophan
(2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
Formula C11 H12 N2 O2
Molecular Weight 204.23 g/mol
Type L-peptide linking
Isomeric SMILES N[C@@H](Cc1c[nH]c2ccccc12)C(O)=O
InChI InChI=1S/C11H12N2O2/c12-9(11(14)15)5-7-6-13-10-4-2-1-3-8(7)10/h1-4,6,9,13H,5,12H2,(H,14,15)/t9-/m0/s1

Chemical Details

Formal Charge 0
Atom Count 27
Chiral Atom Count 1
Chiral Atoms CA
Bond Count 28
Aromatic Bond Count 10
Leaving Atoms OXT H2 HXT

Drug Info: DrugBank

DrugBank ID DB00150   (Stereoisomeric match)
Name L-Tryptophan
  • approved
  • nutraceutical
Description An essential amino acid that is necessary for normal growth in infants and for nitrogen balance in adults. It is a precursor of indole alkaloids in plants. It is a precursor of serotonin (hence its use as an antidepressant and sleep aid). It can be a precursor to niacin, albeit inefficiently, in mammals. [PubChem]
  • (-)-Tryptophan
  • (2S)-2-amino-3-(1H-indol-3-yl)Propanoic acid
  • (S)-alpha-amino-1H-indole-3-propanoic acid
  • (S)-alpha-Amino-beta-(3-indolyl)-propionic acid
  • (S)-Tryptophan
Brand Names
  • Aminosyn
  • Aminosyn 10%
  • Aminosyn 10% W Electrolytes
  • Aminosyn 3.5% M
  • Aminosyn 5%
Affected Organism Humans and other mammals
Indication Tryptophan may be useful in increasing serotonin production, promoting healthy sleep, managing depression by enhancing mental and emotional well-being, managing pain tolerance, and managing weight.
Pharmacology Tryptophan is critical for the production of the body's proteins, enzymes and muscle tissue. It is also essential for the production of niacin, the synthesis of the neurotransmitter serotonin and melatonin. Tryptophan supplements can be used as natural relaxants to help relieve insomnia. Tryptophan can also reduce anxiety and depression and has been shown to reduce the intensity of migraine headaches. Other promising indications include the relief of chronic pain, reduction of impulsivity or mania and the treatment of obsessive or compulsive disorders. Tryptophan also appears to help the immune system and can reduce the risk of cardiac spasms. Tryptophan deficiencies may lead to coronary artery spasms. Tryptophan is used as an essential nutrient in infant formulas and intravenous feeding. Tryptophan is marketed as a prescription drug (Tryptan) for those who do not seem to respond well to conventional antidepressants. It may also be used to treat those afflicted with seasonal affective disorder (a winter-onset depression). Tryptopan serves as the precursor for the synthesis of serotonin (5-hydroxytryptamine, 5-HT) and melatonin (N-acetyl-5-methoxytryptamine).
Mechanism of action A number of important side reactions occur during the catabolism of tryptophan on the pathway to acetoacetate. The first enzyme of the catabolic pathway is an iron porphyrin oxygenase that opens the indole ring. The latter enzyme is highly inducible, its concentration rising almost 10-fold on a diet high in tryptophan. Kynurenine is the first key branch point intermediate in the pathway. Kynurenine undergoes deamniation in a standard transamination reaction yielding kynurenic acid. Kynurenic acid and metabolites have been shown to act as antiexcitotoxics and anticonvulsives. A second side branch reaction produces anthranilic acid plus alanine. Another equivalent of alanine is produced further along the main catabolic pathway, and it is the production of these alanine residues that allows tryptophan to be classified among the glucogenic and ketogenic amino acids. The second important branch point converts kynurenine into 2-amino-3-carboxymuconic semialdehyde, which has two fates. The main flow of carbon elements from this intermediate is to glutarate. An important side reaction in liver is a transamination and several rearrangements to produce limited amounts of nicotinic acid, which leads to production of a small amount of NAD+ and NADP+.
Route of administration
  • Intravenous
  • Oral
  • Amino Acids
  • Amino Acids, Aromatic
  • Amino Acids, Cyclic
  • Amino Acids, Essential
  • Amino Acids, Peptides, and Proteins
ATC-Code N06AX02
AHFS-Code 28:16.04.92
CAS number 73-22-3
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