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Record Information
Version3.6
Creation Date2006-08-13 10:28:32 UTC
Update Date2017-03-02 21:27:28 UTC
HMDB IDHMDB04081
Secondary Accession NumbersNone
Metabolite Identification
Common Name6-Hydroxymelatonin
DescriptionMelatonin is a hormone that is metabolized by cytochrome P450 (CYP) 1A2 to its main primary metabolite 6-hydroxymelatonin. (PMID 11452239 ).
Structure
Thumb
Synonyms
ValueSource
Lopac-H-0627ChEBI
6-OxymelatoninMeSH
Chemical FormulaC13H16N2O3
Average Molecular Weight248.2777
Monoisotopic Molecular Weight248.116092388
IUPAC NameN-[2-(6-hydroxy-5-methoxy-1H-indol-3-yl)ethyl]acetamide
Traditional NameN-[2-(6-hydroxy-5-methoxy-1H-indol-3-yl)ethyl]acetamide
CAS Registry Number2208-41-5
SMILES
COC1=C(O)C=C2NC=C(CCNC(C)=O)C2=C1
InChI Identifier
InChI=1S/C13H16N2O3/c1-8(16)14-4-3-9-7-15-11-6-12(17)13(18-2)5-10(9)11/h5-7,15,17H,3-4H2,1-2H3,(H,14,16)
InChI KeyOMYMRCXOJJZYKE-UHFFFAOYSA-N
Chemical Taxonomy
DescriptionThis compound belongs to the class of chemical entities known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group.
KingdomChemical entities
Super ClassOrganic compounds
ClassOrganoheterocyclic compounds
Sub ClassIndoles and derivatives
Direct ParentHydroxyindoles
Alternative Parents
Substituents
  • Hydroxyindole
  • 3-alkylindole
  • Indole
  • Anisole
  • Alkyl aryl ether
  • 1-hydroxy-2-unsubstituted benzenoid
  • Substituted pyrrole
  • Benzenoid
  • Pyrrole
  • Heteroaromatic compound
  • Azacycle
  • Ether
  • Carboximidic acid derivative
  • Carboximidic acid
  • Propargyl-type 1,3-dipolar organic compound
  • Organic 1,3-dipolar compound
  • Organic oxygen compound
  • Hydrocarbon derivative
  • Organic nitrogen compound
  • Organooxygen compound
  • Organonitrogen compound
  • Organopnictogen compound
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors
Ontology
StatusDetected and Quantified
Origin
  • Drug metabolite
  • Endogenous
Biofunction
  • Waste products
ApplicationNot Available
Cellular locations
  • Cytoplasm
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
PropertyValueSource
Water Solubility0.47 mg/mLALOGPS
logP0.8ALOGPS
logP0.84ChemAxon
logS-2.7ALOGPS
pKa (Strongest Acidic)9.29ChemAxon
pKa (Strongest Basic)-0.94ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area74.35 Å2ChemAxon
Rotatable Bond Count4ChemAxon
Refractivity68.26 m3·mol-1ChemAxon
Polarizability26.65 Å3ChemAxon
Number of Rings2ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
GC-MSGC-MS Spectrum - GC-MS (3 TMS)splash10-00di-1659000000-71cdfc5bdcf432c9a84aView in MoNA
LC-MS/MSLC-MS/MS Spectrum - , positivesplash10-0a4i-3900000000-533a23d884233d4fd905View in MoNA
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-qTof , PositiveNot Available
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
Biofluid Locations
  • Blood
  • Urine
Tissue Location
  • Adrenal Medulla
  • Kidney
  • Liver
Pathways
NameSMPDB LinkKEGG Link
Tryptophan MetabolismSMP00063map00380
Normal Concentrations
BiofluidStatusValueAgeSexConditionReferenceDetails
BloodDetected and Quantified0.00024 (0.00008-0.0004) uMAdult (>18 years old)BothNormal details
UrineExpected but not Quantified Not AvailableNot AvailableNormal
    details
    Abnormal Concentrations
    Not Available
    Associated Disorders and Diseases
    Disease ReferencesNone
    Associated OMIM IDsNone
    DrugBank IDNot Available
    DrugBank Metabolite IDDBMET00258
    Phenol Explorer Compound IDNot Available
    Phenol Explorer Metabolite IDNot Available
    FoodDB IDFDB023304
    KNApSAcK IDNot Available
    Chemspider ID1794
    KEGG Compound IDC05643
    BioCyc IDNot Available
    BiGG ID46185
    Wikipedia LinkNot Available
    NuGOwiki LinkHMDB04081
    Metagene LinkHMDB04081
    METLIN ID7013
    PubChem Compound1864
    PDB IDNot Available
    ChEBI ID308079
    References
    Synthesis ReferenceKaram, Omar; Zunino, Fabien; Chagnaut, Vincent; Jouannetaud, Marie Paule; Jacquesy, Jean Claude. An efficient synthesis of 6-hydroxymelatonin, a human metabolite of melatonin. Tetrahedron Letters (2003), 44(7), 1511-1513.
    Material Safety Data Sheet (MSDS)Download (PDF)
    General References
    1. Higa S, Suzuki T, Sakoda S, Kishimoto S, Takaba Y, Nakajima A, Markey SP: Disturbed function of the pineal gland in familial amyloid polyneuropathy. J Neural Transm. 1987;69(1-2):97-103. [PubMed:3035087 ]
    2. Bojkowski CJ, Arendt J, Shih MC, Markey SP: Melatonin secretion in humans assessed by measuring its metabolite, 6-sulfatoxymelatonin. Clin Chem. 1987 Aug;33(8):1343-8. [PubMed:3608151 ]
    3. Whitson PA, Putcha L, Chen YM, Baker E: Melatonin and cortisol assessment of circadian shifts in astronauts before flight. J Pineal Res. 1995 Apr;18(3):141-7. [PubMed:7562371 ]
    4. Nowak R, McMillen IC, Redman J, Short RV: The correlation between serum and salivary melatonin concentrations and urinary 6-hydroxymelatonin sulphate excretion rates: two non-invasive techniques for monitoring human circadian rhythmicity. Clin Endocrinol (Oxf). 1987 Oct;27(4):445-52. [PubMed:3436070 ]
    5. Bruce J, Tamarkin L, Riedel C, Markey S, Oldfield E: Sequential cerebrospinal fluid and plasma sampling in humans: 24-hour melatonin measurements in normal subjects and after peripheral sympathectomy. J Clin Endocrinol Metab. 1991 Apr;72(4):819-23. [PubMed:2005207 ]
    6. Francis PL, Leone AM, Young IM, Stovell P, Silman RE: Gas chromatographic-mass spectrometric assay for 6-hydroxymelatonin sulfate and 6-hydroxymelatonin glucuronide in urine. Clin Chem. 1987 Apr;33(4):453-7. [PubMed:3829375 ]
    7. Hartter S, Ursing C, Morita S, Tybring G, von Bahr C, Christensen M, Rojdmark S, Bertilsson L: Orally given melatonin may serve as a probe drug for cytochrome P450 1A2 activity in vivo: a pilot study. Clin Pharmacol Ther. 2001 Jul;70(1):10-6. [PubMed:11452239 ]

    Enzymes

    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It performs a variety of oxidation reactions (e.g. caffeine 8-oxidation, omeprazole sulphoxidation, midazolam 1'-hydroxylation and midazolam 4-hydroxylation) of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,8-cineole 2-exo-monooxygenase. The enzyme also hydroxylates etoposide.
    Gene Name:
    CYP3A4
    Uniprot ID:
    P08684
    Molecular weight:
    57255.585
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. This enzyme contributes to the wide pharmacokinetics variability of the metabolism of drugs such as S-warfarin, diclofenac, phenytoin, tolbutamide and losartan.
    Gene Name:
    CYP2C9
    Uniprot ID:
    P11712
    Molecular weight:
    55627.365
    General function:
    Involved in monooxygenase activity
    Specific function:
    Responsible for the metabolism of a number of therapeutic agents such as the anticonvulsant drug S-mephenytoin, omeprazole, proguanil, certain barbiturates, diazepam, propranolol, citalopram and imipramine.
    Gene Name:
    CYP2C19
    Uniprot ID:
    P33261
    Molecular weight:
    55944.565
    General function:
    Involved in monooxygenase activity
    Specific function:
    Metabolizes several precarcinogens, drugs, and solvents to reactive metabolites. Inactivates a number of drugs and xenobiotics and also bioactivates many xenobiotic substrates to their hepatotoxic or carcinogenic forms.
    Gene Name:
    CYP2E1
    Uniprot ID:
    P05181
    Molecular weight:
    56848.42
    General function:
    Involved in monooxygenase activity
    Specific function:
    Exhibits low testosterone 6-beta-hydroxylase activity.
    Gene Name:
    CYP3A43
    Uniprot ID:
    Q9HB55
    Molecular weight:
    57756.285
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Participates in the metabolism of an as-yet-unknown biologically active molecule that is a participant in eye development.
    Gene Name:
    CYP1B1
    Uniprot ID:
    Q16678
    Molecular weight:
    60845.33
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics.
    Gene Name:
    CYP2C18
    Uniprot ID:
    P33260
    Molecular weight:
    55710.075
    General function:
    Secondary metabolites biosynthesis, transport and catabolism
    Specific function:
    May be involved in the metabolism of various pneumotoxicants including naphthalene. Is able to dealkylate ethoxycoumarin, propoxycoumarin, and pentoxyresorufin but possesses no activity toward ethoxyresorufin and only trace dearylation activity toward benzyloxyresorufin. Bioactivates 3-methylindole (3MI) by dehydrogenation to the putative electrophile 3-methylene-indolenine.
    Gene Name:
    CYP2F1
    Uniprot ID:
    P24903
    Molecular weight:
    55500.64
    General function:
    Involved in monooxygenase activity
    Specific function:
    Not Available
    Gene Name:
    CYP4X1
    Uniprot ID:
    Q8N118
    Molecular weight:
    58874.62
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,4-cineole 2-exo-monooxygenase.
    Gene Name:
    CYP2B6
    Uniprot ID:
    P20813
    Molecular weight:
    56277.81
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics.
    Gene Name:
    CYP3A5
    Uniprot ID:
    P20815
    Molecular weight:
    57108.065
    General function:
    Involved in monooxygenase activity
    Specific function:
    Exhibits a coumarin 7-hydroxylase activity. Active in the metabolic activation of hexamethylphosphoramide, N,N-dimethylaniline, 2'-methoxyacetophenone, N-nitrosomethylphenylamine, and the tobacco-specific carcinogen, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone. Possesses phenacetin O-deethylation activity.
    Gene Name:
    CYP2A13
    Uniprot ID:
    Q16696
    Molecular weight:
    56687.095
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics.
    Gene Name:
    CYP3A7
    Uniprot ID:
    P24462
    Molecular weight:
    57525.03
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics.
    Gene Name:
    CYP4B1
    Uniprot ID:
    P13584
    Molecular weight:
    58990.64
    General function:
    Secondary metabolites biosynthesis, transport and catabolism
    Specific function:
    Not Available
    Gene Name:
    CYP4Z1
    Uniprot ID:
    Q86W10
    Molecular weight:
    59085.45
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Most active in catalyzing 2-hydroxylation. Caffeine is metabolized primarily by cytochrome CYP1A2 in the liver through an initial N3-demethylation. Also acts in the metabolism of aflatoxin B1 and acetaminophen. Participates in the bioactivation of carcinogenic aromatic and heterocyclic amines. Catalizes the N-hydroxylation of heterocyclic amines and the O-deethylation of phenacetin.
    Gene Name:
    CYP1A2
    Uniprot ID:
    P05177
    Molecular weight:
    58406.915
    General function:
    Involved in monooxygenase activity
    Specific function:
    Catalyzes the formation of aromatic C18 estrogens from C19 androgens.
    Gene Name:
    CYP19A1
    Uniprot ID:
    P11511
    Molecular weight:
    57882.48
    General function:
    Involved in monooxygenase activity
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. In the epoxidation of arachidonic acid it generates only 14,15- and 11,12-cis-epoxyeicosatrienoic acids. It is the principal enzyme responsible for the metabolism the anti-cancer drug paclitaxel (taxol).
    Gene Name:
    CYP2C8
    Uniprot ID:
    P10632
    Molecular weight:
    55824.275
    General function:
    Involved in monooxygenase activity
    Specific function:
    Has a potential importance for extrahepatic xenobiotic metabolism.
    Gene Name:
    CYP2S1
    Uniprot ID:
    Q96SQ9
    Molecular weight:
    55816.205
    General function:
    Involved in monooxygenase activity
    Specific function:
    This enzyme metabolizes arachidonic acid predominantly via a NADPH-dependent olefin epoxidation to all four regioisomeric cis-epoxyeicosatrienoic acids. One of the predominant enzymes responsible for the epoxidation of endogenous cardiac arachidonic acid pools.
    Gene Name:
    CYP2J2
    Uniprot ID:
    P51589
    Molecular weight:
    57610.165
    General function:
    Secondary metabolites biosynthesis, transport and catabolism
    Specific function:
    Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics.
    Gene Name:
    CYP2A7
    Uniprot ID:
    P20853
    Molecular weight:
    56424.735
    General function:
    Involved in monooxygenase activity
    Specific function:
    Exhibits a high coumarin 7-hydroxylase activity. Can act in the hydroxylation of the anti-cancer drugs cyclophosphamide and ifosphamide. Competent in the metabolic activation of aflatoxin B1. Constitutes the major nicotine C-oxidase. Acts as a 1,4-cineole 2-exo-monooxygenase. Possesses low phenacetin O-deethylation activity.
    Gene Name:
    CYP2A6
    Uniprot ID:
    P11509
    Molecular weight:
    56517.005
    General function:
    Involved in monooxygenase activity
    Specific function:
    Not Available
    Gene Name:
    CYP1A1
    Uniprot ID:
    A0N0X8
    Molecular weight:
    58164.8
    General function:
    Involved in monooxygenase activity
    Specific function:
    Not Available
    Gene Name:
    CYP2D6
    Uniprot ID:
    Q6NWU0
    Molecular weight:
    55729.9