MET is found in 125108 entries

MET in polymers: 124969 entries. Examples include: 101M, 102L, 102M

MET as free ligands, exist in 139 entries. Examples include 1ABW, 1C21, 1D6S

Find related ligands: Stereoisomers Similar ligands Chemical Structure Search

View summary at Ligand Expo

Chemical Component Summary

Identifiers L-methionine
(2S)-2-amino-4-methylsulfanyl-butanoic acid
Formula C5 H11 N O2 S
Molecular Weight 149.21 g/mol
Type L-peptide linking
Isomeric SMILES CSCC[C@H](N)C(O)=O
InChI InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)/t4-/m0/s1

Chemical Details

Formal Charge 0
Atom Count 20
Chiral Atom Count 1
Chiral Atoms CA
Bond Count 19
Aromatic Bond Count 0
Leaving Atoms OXT H2 HXT

Drug Info: DrugBank

DrugBank ID DB00134   (Stereoisomeric match)
Name L-Methionine
  • approved
  • nutraceutical
Description A sulfur containing essential amino acid that is important in many body functions. It is a chelating agent for heavy metals. [PubChem]
  • (2S)-2-amino-4-(Methylsulfanyl)butanoic acid
  • (S)-2-amino-4-(methylthio)butanoic acid
  • (S)-2-amino-4-(methylthio)butyric acid
  • (S)-methionine
  • L-(-)-Methionine
Salts Methionine hydrochloride
Brand Names
  • Aminosyn
  • Aminosyn 10%
  • Aminosyn 10% W Electrolytes
  • Aminosyn 3.5% M
  • Aminosyn 5%
Affected Organism Humans and other mammals
Indication Used for protein synthesis including the formation of SAMe, L-homocysteine, L-cysteine, taurine, and sulfate.
Pharmacology L-Methionine is a principle supplier of sulfur which prevents disorders of the hair, skin and nails; helps lower cholesterol levels by increasing the liver's production of lecithin; reduces liver fat and protects the kidneys; a natural chelating agent for heavy metals; regulates the formation of ammonia and creates ammonia-free urine which reduces bladder irritation; influences hair follicles and promotes hair growth. L-methionine may protect against the toxic effects of hepatotoxins, such as acetaminophen. Methionine may have antioxidant activity.
Mechanism of action The mechanism of the possible anti-hepatotoxic activity of L-methionine is not entirely clear. It is thought that metabolism of high doses of acetaminophen in the liver lead to decreased levels of hepatic glutathione and increased oxidative stress. L-methionine is a precursor to L-cysteine. L-cysteine itself may have antioxidant activity. L-cysteine is also a precursor to the antioxidant glutathione. Antioxidant activity of L-methionine and metabolites of L-methionine appear to account for its possible anti-hepatotoxic activity. Recent research suggests that methionine itself has free-radical scavenging activity by virtue of its sulfur, as well as its chelating ability.
Route of administration
  • Intravenous
  • Oral
  • Amino Acids
  • Amino Acids, Essential
  • Amino Acids, Neutral
  • Amino Acids, Peptides, and Proteins
  • Amino Acids, Sulfur
ATC-Code V03AB26
CAS number 63-68-3
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