You are using an unsupported browser. Please upgrade your browser to a newer version to get the best experience on Human Metabolome Database.
Record Information
Creation Date2005-11-16 15:48:42 UTC
Update Date2016-02-11 01:04:19 UTC
Secondary Accession NumbersNone
Metabolite Identification
Common NameLeukotriene A4
DescriptionLeukotriene A4 (LTA4) is the first metabolite in the series of reactions leading to the synthesis of all leukotrienes. 5-Lipoxygenase (5-LO) catalyzes the two-step conversion of arachidonic acid to LTA4.The first step consists of the oxidation of arachidonic acid to the unstable intermediate 5-hydroperoxyeicosatetraenoic acid (5-HPETE), and the second step is the dehydration of 5-HPETE to form LTA4. Leukotriene A4, an unstable epoxide, is hydrolyzed to leukotriene B4 or conjugated with glutathione to yield leukotriene C4 and its metabolites, leukotriene D4 and leukotriene E4. The leukotrienes participate in host defense reactions and pathophysiological conditions such as immediate hypersensitivity and inflammation. Recent studies also suggest a neuroendocrine role for leukotriene C4 in luteinizing hormone secretion. (PMID: 10591081 , 2820055 ). Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs) and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes) and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signaling pathways.
(7E,9E,11Z,14Z)-(5S,6S)-5,6-Epoxyeicosa-7,9,11,14-tetraenoic acidChEBI
5(S)-5,6-oxido-7,9-trans-11,14-cis-Eicosatetraenoic acidChEBI
5S,6S-Epoxy-7E,9E,11Z,14Z-eicosatetraenoic acidChEBI
5S,6S-Leukotriene a4ChEBI
(5S,6S,7E,9E,11Z,14Z)-5,6-Epoxyicosa-7,9,11,14-tetraenoic acidGenerator
(7E,9E,11Z,14Z)-(5S,6S)-5,6-Epoxyicosa-7,9,11,14-tetraenoic acidGenerator
(7E,9E,11Z,14Z)-(5S,6S)-5,6-Epoxyicosa- 7,9,11,14-tetraenoateHMDB
(7E,9E,11Z,14Z)-(5S,6S)-5,6-Epoxyicosa- 7,9,11,14-tetraenoic acidHMDB
(7E,9E,11Z,14Z)-(5S,6S)-5,6-Epoxyicosa-7,9,11,14-tetrenoioc acidHMDB
Chemical FormulaC20H30O3
Average Molecular Weight318.4504
Monoisotopic Molecular Weight318.219494826
IUPAC Name4-[(2S,3S)-3-[(1E,3E,5Z,8Z)-tetradeca-1,3,5,8-tetraen-1-yl]oxiran-2-yl]butanoic acid
Traditional Nameleukotriene A4
CAS Registry Number72059-45-1
InChI Identifier
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as leukotrienes. These are eicosanoids containing a hydroxyl group attached to the aliphatic chain of an arachidonic acid. Eicosanoids containing a hydroxyl group attached to the aliphatic chain of an arachidonic acid. Leukotrienes have four double bonds, three (and only three) of which are conjugated.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassFatty Acyls
Sub ClassEicosanoids
Direct ParentLeukotrienes
Alternative Parents
  • Leukotriene
  • Heterocyclic fatty acid
  • Epoxy fatty acid
  • Oxacycle
  • Organoheterocyclic compound
  • Monocarboxylic acid or derivatives
  • Ether
  • Oxirane
  • Dialkyl ether
  • Carboxylic acid
  • Carboxylic acid derivative
  • Hydrocarbon derivative
  • Organooxygen compound
  • Carbonyl group
  • Aliphatic heteromonocyclic compound
Molecular FrameworkAliphatic heteromonocyclic compounds
External Descriptors
StatusExpected but not Quantified
  • Endogenous
  • Food
  • Cell signaling
  • Component of Prostaglandin and leukotriene metabolism
  • Fuel and energy storage
  • Fuel or energy source
  • Membrane integrity/stability
  • Nutrients
  • Stabilizers
  • Surfactants and Emulsifiers
Cellular locations
  • Cytoplasm
  • Extracellular
  • Membrane (predicted from logP)
  • Endoplasmic reticulum
Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.000424 mg/mLALOGPS
pKa (Strongest Acidic)4.49ChemAxon
pKa (Strongest Basic)-4.2ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area49.83 Å2ChemAxon
Rotatable Bond Count13ChemAxon
Refractivity99.32 m3·mol-1ChemAxon
Polarizability37.95 Å3ChemAxon
Number of Rings1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, NegativeNot Available
Biological Properties
Cellular Locations
  • Cytoplasm
  • Extracellular
  • Membrane (predicted from logP)
  • Endoplasmic reticulum
Biofluid LocationsNot Available
Tissue Location
  • Epidermis
Acetaminophen Action PathwaySMP00710Not Available
Acetylsalicylic Acid PathwaySMP00083Not Available
Antipyrine Action PathwaySMP00692Not Available
Antrafenine Action PathwaySMP00693Not Available
Arachidonic Acid MetabolismSMP00075map00590
Bromfenac PathwaySMP00102Not Available
Carprofen Action PathwaySMP00694Not Available
Celecoxib PathwaySMP00096Not Available
Diclofenac PathwaySMP00093Not Available
Diflunisal PathwaySMP00289Not Available
Etodolac PathwaySMP00084Not Available
Etoricoxib Action PathwaySMP00695Not Available
Fenoprofen Action PathwaySMP00696Not Available
Flurbiprofen Action PathwaySMP00697Not Available
Ibuprofen PathwaySMP00086Not Available
Indomethacin PathwaySMP00104Not Available
Ketoprofen PathwaySMP00085Not Available
Ketorolac PathwaySMP00098Not Available
Leukotriene C4 Synthesis DeficiencySMP00353Not Available
Lornoxicam Action PathwaySMP00700Not Available
Lumiracoxib Action PathwaySMP00699Not Available
Magnesium salicylate Action PathwaySMP00698Not Available
Mefanamic Acid PathwaySMP00109Not Available
Meloxicam PathwaySMP00106Not Available
Nabumetone PathwaySMP00114Not Available
Naproxen PathwaySMP00120Not Available
Nepafenac Action PathwaySMP00702Not Available
Oxaprozin PathwaySMP00113Not Available
Phenylbutazone Action PathwaySMP00701Not Available
Piroxicam PathwaySMP00077Not Available
Rofecoxib PathwaySMP00087Not Available
Salicylate-sodium Action PathwaySMP00708Not Available
Salicylic Acid Action PathwaySMP00709Not Available
Salsalate Action PathwaySMP00707Not Available
Sulindac PathwaySMP00094Not Available
Suprofen PathwaySMP00101Not Available
Tenoxicam Action PathwaySMP00706Not Available
Tiaprofenic Acid Action PathwaySMP00705Not Available
Tolmetin Action PathwaySMP00704Not Available
Trisalicylate-choline Action PathwaySMP00703Not Available
Valdecoxib PathwaySMP00116Not Available
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB022561
KNApSAcK IDNot Available
Chemspider ID4444074
KEGG Compound IDC00909
BioCyc IDCPD-8892
BiGG ID36355
Wikipedia LinkLeukotriene A4
NuGOwiki LinkHMDB01337
Metagene LinkHMDB01337
PubChem Compound5280383
PDB IDNot Available
ChEBI ID15651
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Iversen L, Fogh K, Ziboh VA, Kristensen P, Schmedes A, Kragballe K: Leukotriene B4 formation during human neutrophil keratinocyte interactions: evidence for transformation of leukotriene A4 by putative keratinocyte leukotriene A4 hydrolase. J Invest Dermatol. 1993 Mar;100(3):293-8. [8382716 ]
  2. Luscinskas FW, Nicolaou KC, Webber SE, Veale CA, Gimbrone MA Jr, Serhan CN: Ca2+ mobilization with leukotriene A4 and epoxytetraenes in human neutrophils. Biochem Pharmacol. 1990 Jan 15;39(2):355-65. [2154229 ]
  3. MacMillan DK, Hill E, Sala A, Sigal E, Shuman T, Henson PM, Murphy RC: Eosinophil 15-lipoxygenase is a leukotriene A4 synthase. J Biol Chem. 1994 Oct 28;269(43):26663-8. [7929400 ]
  4. Iversen L, Ziboh VA, Shimizu T, Ohishi N, Radmark O, Wetterholm A, Kragballe K: Identification and subcellular localization of leukotriene A4-hydrolase activity in human epidermis. J Dermatol Sci. 1994 Jun;7(3):191-201. [7918238 ]
  5. Nicholson DW, Klemba MW, Rasper DM, Metters KM, Zamboni RJ, Ford-Hutchinson AW: Purification of human leukotriene C4 synthase from dimethylsulfoxide-differentiated U937 cells. Eur J Biochem. 1992 Oct 15;209(2):725-34. [1425677 ]
  6. Silverman ES, Drazen JM: The biology of 5-lipoxygenase: function, structure, and regulatory mechanisms. Proc Assoc Am Physicians. 1999 Nov-Dec;111(6):525-36. [10591081 ]
  7. Samuelsson B, Dahlen SE, Lindgren JA, Rouzer CA, Serhan CN: Leukotrienes and lipoxins: structures, biosynthesis, and biological effects. Science. 1987 Sep 4;237(4819):1171-6. [2820055 ]


General function:
Involved in enzyme activator activity
Specific function:
Catalyzes the conjugation of leukotriene A4 with reduced glutathione to form leukotriene C4.
Gene Name:
Uniprot ID:
Molecular weight:
Leukotriene A4 + Glutathione → Leukotriene C4details
General function:
Involved in metal ion binding
Specific function:
Catalyzes the first step in leukotriene biosynthesis, and thereby plays a role in inflammatory processes.
Gene Name:
Uniprot ID:
Molecular weight:
5(S)-Hydroperoxyeicosatetraenoic acid → Leukotriene A4 + Waterdetails
Arachidonic acid + Oxygen → Leukotriene A4 + Waterdetails
General function:
Involved in binding
Specific function:
Epoxide hydrolase that catalyzes the final step in the biosynthesis of the proinflammatory mediator leukotriene B4. Has also aminopeptidase activity.
Gene Name:
Uniprot ID:
Molecular weight:
Leukotriene A4 + Water → Leukotriene B4details