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Record Information
StatusDetected and Quantified
Creation Date2007-04-12 20:56:15 UTC
Update Date2017-12-07 01:55:38 UTC
Secondary Accession Numbers
  • HMDB06037
Metabolite Identification
Common Name8-Hydroxy-7-methylguanine
Description8-Hydroxy-7-methylguanine is a modified nucleoside. 8-Hydroxy-7-methylguanine is an endogenous methylated nucleoside found in human fluids; methylated purine bases are present in higher amounts in tumor-bearing patients compared to healthy controls. Human exposure to carcinogenic alkylating agents can lead to the formation of covalently bound adducts in DNA, some of which are excreted in urine as alkylated purines following DNA degradation and repair; the N2 position of guanine is one of the major sites for DNA modification by various carcinogens. Measurements of RNA or DNA catabolites in urine can be used as a measure for the metabolism of each of the three major species of RNA. An accumulation of modified ribonucleosides appears in the serum of uremic patients. (PMID: 3506820 , 5961889 , 16527824 , 16061253 , 8043914 , 2428556 , 7159514 , 9607216 ).
SynonymsNot Available
Chemical FormulaC6H7N5O2
Average Molecular Weight181.1521
Monoisotopic Molecular Weight181.059974493
IUPAC Name2-amino-7-methyl-6,7,8,9-tetrahydro-3H-purine-6,8-dione
Traditional Name2-amino-7-methyl-3,9-dihydropurine-6,8-dione
CAS Registry Number1688-85-3
InChI Identifier
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as hypoxanthines. These are compounds containing the purine derivative 1H-purin-6(9H)-one. Purine is a bicyclic aromatic compound made up of a pyrimidine ring fused to an imidazole ring.
KingdomOrganic compounds
Super ClassOrganoheterocyclic compounds
Sub ClassPurines and purine derivatives
Direct ParentHypoxanthines
Alternative Parents
  • 6-oxopurine
  • Hypoxanthine
  • Aminopyrimidine
  • Pyrimidone
  • N-substituted imidazole
  • Pyrimidine
  • Vinylogous amide
  • Imidazole
  • Azole
  • Heteroaromatic compound
  • Urea
  • Azacycle
  • Organic oxide
  • Amine
  • Primary amine
  • Organooxygen compound
  • Organonitrogen compound
  • Organic nitrogen compound
  • Organopnictogen compound
  • Organic oxygen compound
  • Hydrocarbon derivative
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors

Biological location:


Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility3.03 g/LALOGPS
pKa (Strongest Acidic)8.17ChemAxon
pKa (Strongest Basic)0.51ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count5ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area99.82 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity52.5 m³·mol⁻¹ChemAxon
Polarizability16.29 ųChemAxon
Number of Rings2ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-001r-0900000000-4e0a1211082933a52189View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-001i-0900000000-7c1b5b61581c8650b910View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-001i-0900000000-15a7e1a0805e52238283View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-00rb-7900000000-b9f171dba84ae611184aView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-001i-0900000000-ca5228f6b8181c8393abView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-001r-1900000000-8ad42ac014332bbefdc5View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0007-9200000000-a717cec7a8c28103e4aaView in MoNA
Biological Properties
Cellular LocationsNot Available
Biospecimen Locations
  • Blood
  • Urine
Tissue LocationNot Available
PathwaysNot Available
Normal Concentrations
BloodExpected but not Quantified Not AvailableNot Available
    UrineDetected and Quantified0.6 (0.4-0.72) umol/mmol creatinineAdult (>18 years old)BothNormal
      • Geigy Scientific ...
    Abnormal Concentrations
    Not Available
    Associated Disorders and Diseases
    Disease ReferencesNone
    Associated OMIM IDsNone
    DrugBank IDNot Available
    Phenol Explorer Compound IDNot Available
    FoodDB IDFDB023813
    KNApSAcK IDNot Available
    Chemspider ID272336
    KEGG Compound IDNot Available
    BioCyc IDNot Available
    BiGG IDNot Available
    Wikipedia LinkNot Available
    METLIN IDNot Available
    PubChem Compound308075
    PDB IDNot Available
    ChEBI ID74064
    Synthesis ReferenceNot Available
    Material Safety Data Sheet (MSDS)Not Available
    General References
    1. Niwa T, Takeda N, Yoshizumi H: RNA metabolism in uremic patients: accumulation of modified ribonucleosides in uremic serum. Technical note. Kidney Int. 1998 Jun;53(6):1801-6. [PubMed:9607216 ]
    2. Choi JY, Guengerich FP: Adduct size limits efficient and error-free bypass across bulky N2-guanine DNA lesions by human DNA polymerase eta. J Mol Biol. 2005 Sep 9;352(1):72-90. [PubMed:16061253 ]
    3. Morris GS, Simmonds HA, Davies PM: Use of biological fluids for the rapid diagnosis of potentially lethal inherited disorders of human purine and pyrimidine metabolism. Biomed Chromatogr. 1986 Jun;1(3):109-18. [PubMed:3506820 ]
    4. Kanduc D, Sapia G: Origin of 1,7-dimethylguanosine in tRNA chemical and enzymatic methylation. Boll Soc Ital Biol Sper. 1982 Oct 15;58(19):1221-5. [PubMed:7159514 ]
    5. Litwack MD, Weissmann B: Source of urinary 8-hydroxy-7-methylguanine in man. Biochemistry. 1966 Sep;5(9):3007-12. [PubMed:5961889 ]
    6. Choi JY, Guengerich FP: Kinetic evidence for inefficient and error-prone bypass across bulky N2-guanine DNA adducts by human DNA polymerase iota. J Biol Chem. 2006 May 5;281(18):12315-24. Epub 2006 Mar 8. [PubMed:16527824 ]
    7. Porcelli B, Pagani R, Lorenzini L, De Martino A, Catinella S, Traldi P: Different mass spectrometric approaches in the identification of endogenous methylated purine bases in urine extracts. Rapid Commun Mass Spectrom. 1994 Jun;8(6):443-50. [PubMed:8043914 ]
    8. Sander G, Topp H, Heller-Schoch G, Wieland J, Schoch G: Ribonucleic acid turnover in man:RNA catabolites in urine as measure for the metabolism of each of the three major species of RNA. Clin Sci (Lond). 1986 Oct;71(4):367-74. [PubMed:2428556 ]