Aflatoxin B2 (T3D3669)

IdentificationTaxonomyBiological PropertiesPhysical PropertiesToxicity ProfileSpectraConcentrationsLinksReferencesGene RegulationTargets (3)XML
Targets (3)
Record Information
Version2.0
Creation Date2010-04-15 16:55:14 UTC
Update Date2014-12-24 20:26:20 UTC
Accession NumberT3D3669
Identification
Common NameAflatoxin B2
ClassSmall Molecule
DescriptionAflatoxin B2 is a metabolite of Aspergillus flavus.
Compound Type
  • Ester
  • Ether
  • Food Toxin
  • Fungal Toxin
  • Furocoumarin
  • Metabolite
  • Mycotoxin
  • Natural Compound
  • Organic Compound
Chemical Structure
Thumb
MOLSDFPDBSMILESInChI
Synonyms
Synonym
Aflatoxin b2
Aflatoxin B2 alpha
Dihydroafflatoxin B1
Dihydroaflatoxin B1
Dihydroaflatoxine B1
Chemical FormulaC17H14O6
Average Molecular Mass314.290 g/mol
Monoisotopic Mass314.079 g/mol
CAS Registry Number7220-81-7
IUPAC Name11-methoxy-6,8,19-trioxapentacyclo[10.7.0.0²,⁹.0³,⁷.0¹³,¹⁷]nonadeca-1(12),2(9),10,13(17)-tetraene-16,18-dione
Traditional Nameaflatoxin B2
SMILESCOC1=CC2=C(C3CCOC3O2)C2=C1C1=C(C(=O)CC1)C(=O)O2
InChI IdentifierInChI=1/C17H14O6/c1-20-10-6-11-14(8-4-5-21-17(8)22-11)15-13(10)7-2-3-9(18)12(7)16(19)23-15/h6,8,17H,2-5H2,1H3
InChI KeyInChIKey=WWSYXEZEXMQWHT-UHFFFAOYNA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as difurocoumarocyclopentenones. These are polycyclic aromatic compounds containing a cyclopenten-2-one ring fused to the coumarin moiety of the difurocoumarin skeleton.
KingdomOrganic compounds
Super ClassPhenylpropanoids and polyketides
ClassCoumarins and derivatives
Sub ClassFuranocoumarins
Direct ParentDifurocoumarocyclopentenones
Alternative Parents
Substituents
  • Difurocoumarocyclopentenone
  • Difurocoumarin
  • Benzopyran
  • 1-benzopyran
  • Coumaran
  • Anisole
  • Aryl alkyl ketone
  • Aryl ketone
  • Alkyl aryl ether
  • Pyranone
  • Pyran
  • Benzenoid
  • Heteroaromatic compound
  • Tetrahydrofuran
  • Lactone
  • Ketone
  • Acetal
  • Organoheterocyclic compound
  • Ether
  • Oxacycle
  • Organooxygen compound
  • Hydrocarbon derivative
  • Organic oxide
  • Organic oxygen compound
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors
Biological Properties
StatusDetected and Not Quantified
OriginExogenous
Cellular Locations
  • Cytoplasm
  • Extracellular
Biofluid LocationsNot Available
Tissue LocationsNot Available
PathwaysNot Available
ApplicationsNot Available
Biological RolesNot Available
Chemical RolesNot Available
Physical Properties
StateSolid
AppearanceColorless to pale yellow crystals.
Experimental Properties
PropertyValue
Melting Point310°C
Boiling PointNot Available
SolubilityNot Available
LogPNot Available
Predicted Properties
PropertyValueSource
Water Solubility0.39 g/LALOGPS
logP1.63ALOGPS
logP1.57ChemAxon
logS-2.9ALOGPS
pKa (Strongest Acidic)17.79ChemAxon
pKa (Strongest Basic)-4.1ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count5ChemAxon
Hydrogen Donor Count0ChemAxon
Polar Surface Area71.06 ŲChemAxon
Rotatable Bond Count1ChemAxon
Refractivity78.49 m³·mol⁻¹ChemAxon
Polarizability30.9 ųChemAxon
Number of Rings5ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash KeyDeposition DateView
GC-MSGC-MS Spectrum - EI-B (Non-derivatized)splash10-03di-0039000000-610151efc4e68c6939eb2017-09-12View Spectrum
GC-MSGC-MS Spectrum - EI-B (Non-derivatized)splash10-03di-0039000000-610151efc4e68c6939eb2018-05-18View Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-0080-0190000000-cdd965c2769a1d578fba2017-09-01View Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, PositiveNot Available2021-10-12View Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, PositiveNot Available2021-10-12View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 50V, Positivesplash10-0a4l-0390000000-85aa7a411b52bfa748ac2021-09-20View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 20V, Positivesplash10-014i-0009000000-306b14c6051334a7615d2021-09-20View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 10V, Positivesplash10-014i-0009000000-6117c5ee93218e1f3ee42021-09-20View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 30V, Positivesplash10-014i-0069000000-e8cfaba3e9fca310b5f82021-09-20View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 40V, Positivesplash10-0abi-0090000000-c1f0b82710fe7cf4a4fa2021-09-20View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 50V, Positivesplash10-0a4l-0390000000-47a96f38cc39db4215d82021-09-20View Spectrum
LC-MS/MSLC-MS/MS Spectrum - 40V, Positivesplash10-0abi-0090000000-f0166b802bbb8d10da362021-09-20View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-014i-0039000000-d446a0adf08fa67d4d102015-04-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-014i-0094000000-7a6e82836edee1f981c12015-04-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-02t9-1490000000-29ed28bb149ea2411c262015-04-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-03di-0039000000-baac69398819490766442015-04-25View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-03di-1097000000-d8269f211e11ae5c68b82015-04-25View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0fb9-2190000000-9ea1e85b37f388c7c5e52015-04-25View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-03di-0009000000-7c7169b7540bc94558262021-09-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-03di-0049000000-5b4008ed9ce6ec916cef2021-09-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0002-0492000000-e1dbbfaed1432ac0341f2021-09-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-014i-0009000000-2ba875095a8aafa31ef72021-09-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-014i-0019000000-519c5d1d27095e3ff42b2021-09-24View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-000i-0091000000-6cb76c17d0d87928e5402021-09-24View Spectrum
MSMass Spectrum (Electron Ionization)splash10-03di-4189000000-6bab374050b1044ec4942014-09-20View Spectrum
1D NMR13C NMR Spectrum (1D, 100 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 100 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 1000 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 1000 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 200 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 200 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 300 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 300 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 400 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 400 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 500 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 500 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 600 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 600 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 700 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 700 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 800 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 800 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR13C NMR Spectrum (1D, 900 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
1D NMR1H NMR Spectrum (1D, 900 MHz, H2O, predicted)Not Available2022-08-23View Spectrum
Toxicity Profile
Route of ExposureOral, dermal, inhalation, and parenteral (contaminated drugs). (3)
Mechanism of ToxicityAflatoxins produce singlet oxygen upon their exposure to UV (365-nm) light. Singlet oxygen in turn activates them to mutagens and DNA binding species. Aflatoxin metabolites can intercalate into DNA and alkylate the bases through their epoxide moiety, binding particularity to N7-guanine bases. In addition to randomly mutating DNA, this is thought to cause mutations in the p53 gene, an important gene in preventing cell cycle progression when there are DNA mutations, or signaling apoptosis. (12, 1, 2) The mechanism of action many furocoumarins is based on their ability to form photoadducts with DNA and other cellular components such as RNA, proteins, and several proteins found in the membrane such as phospholipases A2 and C, Ca-dependent and cAMPdependent protein-kinase and epidermal growth factor. Furocoumarins intercalate between base pairs of DNA and after ultraviolet-A irradiation, giving cycloadducts. (15)
MetabolismAflatoxin B2 is metabolized in the liver by microsomal monooxygenases to the less toxic reactive metabolite alfatoxin M2. Aflatoxin B2 is also proposed to be metabolized to B1, which in turn is transformed to M1. (4, 14)
Toxicity ValuesNot Available
Lethal DoseNot Available
Carcinogenicity (IARC Classification)1, carcinogenic to humans (16)
Uses/SourcesThe native habitat of Aspergillus is in soil, decaying vegetation, hay, and grains undergoing microbiological deterioration and it invades all types of organic substrates whenever conditions are favorable for its growth. Crops which are frequently affected include cereals (maize, sorghum, pearl millet, rice, wheat), oilseeds (peanut, soybean, sunflower, cotton), spices (chile peppers, black pepper, coriander, turmeric, ginger), and tree nuts (almond, pistachio, walnut, coconut, brazil nut). The toxin can also be found in the milk of animals which are fed contaminated feed. Thus, aflatoxins are usually encountered in thecontext of chronic exposure, via food intake or secondary to the handling of foodstuffs. (14)
Minimum Risk LevelNot Available
Health EffectsThe main target organ in mammals is the liver so aflatoxicosis is primarily a hepatic disease. Protracted exposure to aflatoxins may cause liver damage and necrosis, cholestasis, and hepatomas. Moreover, protracted exposure to aflatoxins has been associated with hepatocellular carcinoma, acute hepatitis, Reye's syndrome, bile duct cell proliferation, periportal fibrosis, hemorrhages, mucous membrane jaundice, fatty liver changes, cirrhosis in malnourished children, and kwashiorkor. However, aflatoxins accumulate in the presence of liver disease, and the association with hepatic cancer is confounded by the occurrence of hepatitis-B. Thus, it is not clear in these various instances whether aflatoxin is a primary cause of the disease, is an innocent bystander which accumulates secondary to the disease process, or is a contributing cause in conjunction with other factors. It is also mutagenic and teratogenic. Inhaled aflatoxins may produce pulmonary adenomatosis. Aflatoxins modify the immune system by affecting antibody formation, complement, cell-mediated immunity, and phagocytosis. (5, 14) Furocoumarins can cause photosensitization dermatitis especially if these compounds come into contact with the skin. Some furocoumarins, especially bifunctional furocoumarins, are known to be carcinogenic (6). Furocoumarin photochemotherapy is known to induce a number of side-effects including erythema, edema, hyperpigmentation, and premature aging of skin. All photobiological effects of furocoumarins result from their photochemical reactions. Because many dietary or water soluble furocoumarins are strong inhibitors of cytochrome P450s, they will also cause adverse drug reactions when taken with other drugs. Limited evidence of carcinogenic effect. (15)
SymptomsA broad range of symptoms can be found depending upon dosage, including, vomiting, abdominal pain, hemorrhage, and pulmonary edema. (13)
TreatmentAdministration of phonobarbital enhances hepatic transformation activities and also protects against AFB-induced toxicity, carcinogenicity and DNA binding in vivo. In cases of ingestion, feeding large quantities of an adsorbent such as activated charcoal may be used. Antioxidants such as ellagic acid and inducers of some cytochromes P450, such as indole-3-carbinol, may give a protective effect. (5, 13)
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
DrugBank IDNot Available
HMDB IDHMDB35208
PubChem Compound ID23648
ChEMBL IDNot Available
ChemSpider ID22111
KEGG IDC16753
UniProt IDNot Available
OMIM ID
ChEBI IDNot Available
BioCyc IDNot Available
CTD IDNot Available
Stitch IDNot Available
PDB IDNot Available
ACToR IDNot Available
Wikipedia LinkAflatoxin
References
Synthesis ReferenceNot Available
MSDST3D3669.pdf
General References
  1. Stark AA, Liberman DF: Synergism between aflatoxins in covalent binding to DNA and in mutagenesis in the photoactivation system. Mutat Res. 1991 Mar;247(1):77-86. [1900569 ]
  2. Eaton DL, Gallagher EP: Mechanisms of aflatoxin carcinogenesis. Annu Rev Pharmacol Toxicol. 1994;34:135-72. [8042848 ]
  3. Peraica M, Domijan AM: Contamination of food with mycotoxins and human health. Arh Hig Rada Toksikol. 2001 Mar;52(1):23-35. [11370295 ]
  4. Ide S, Minami M, Ishihara K, Uhl GR, Sora I, Ikeda K: Mu opioid receptor-dependent and independent components in effects of tramadol. Neuropharmacology. 2006 Sep;51(3):651-8. Epub 2006 Jun 21. [16793069 ]
  5. Grond S, Sablotzki A: Clinical pharmacology of tramadol. Clin Pharmacokinet. 2004;43(13):879-923. [15509185 ]
  6. Mullen MP, Pathak MA, West JD, Harrist TJ, Dall'Acqua F: Carcinogenic effects of monofunctional and bifunctional furocoumarins. Natl Cancer Inst Monogr. 1984 Dec;66:205-10. [6531030 ]
  7. Ostertag E, Becker T, Ammon J, Bauer-Aymanns H, Schrenk D: Effects of storage conditions on furocoumarin levels in intact, chopped, or homogenized parsnips. J Agric Food Chem. 2002 Apr 24;50(9):2565-70. [11958623 ]
  8. Santana L, Uriarte E, Roleira F, Milhazes N, Borges F: Furocoumarins in medicinal chemistry. Synthesis, natural occurrence and biological activity. Curr Med Chem. 2004 Dec;11(24):3239-61. [15579011 ]
  9. Rumack BH POISINDEX(R) Information System Micromedex, Inc., Englewood, CO, 2010; CCIS Volume 143, edition expires Feb, 2010. Hall AH & Rumack BH (Eds): TOMES(R) Information System Micromedex, Inc., Englewood, CO, 2010; CCIS Volume 143, edition expires Feb, 2010.
  10. ROEBUCK BD ET AL; CANCER RES 38 (4): 999 (1978)
  11. Yannai, Shmuel. (2004) Dictionary of food compounds with CD-ROM: Additives, flavors, and ingredients. Boca Raton: Chapman & Hall/CRC.
  12. International Agency for Research on Cancer (IARC) - Summaries & Evaluations AFLATOXINS [Link]
  13. Aflatoxins: essential data [Link]
  14. Wikipedia. Aflatoxin. Last Updated 3 May 2010. [Link]
  15. Herboreal Ltd - Manufacturer of rare phytochemicals (2009). [Link]
  16. International Agency for Research on Cancer (2014). IARC Monographs on the Evaluation of Carcinogenic Risks to Humans. [Link]
Gene Regulation
Up-Regulated GenesNot Available
Down-Regulated GenesNot Available

Targets

1. DNA
General Function:
Used for biological information storage.
Specific Function:
DNA contains the instructions needed for an organism to develop, survive and reproduce.
Molecular Weight:
2.15 x 1012 Da
References
  1. Stark AA, Liberman DF: Synergism between aflatoxins in covalent binding to DNA and in mutagenesis in the photoactivation system. Mutat Res. 1991 Mar;247(1):77-86. [1900569 ]
  2. Eaton DL, Gallagher EP: Mechanisms of aflatoxin carcinogenesis. Annu Rev Pharmacol Toxicol. 1994;34:135-72. [8042848 ]
  3. Gupta M, Ali R: Fluorescence studies on the interaction of furocoumarins with DNA in the dark. J Biochem. 1984 May;95(5):1253-7. [6746605 ]
  4. Palumbo M, Capasso L, Palu G, Marciani Magno S: DNA-binding of water-soluble furocoumarins: a thermodynamic and conformational approach to understanding different biological effects. Nucleic Acids Res. 1984 Nov 26;12(22):8567-78. [6504703 ]
  5. International Agency for Research on Cancer (IARC) - Summaries & Evaluations AFLATOXINS [Link]
Target Details
2. Cytochrome P450 2C9
General Function:
Steroid hydroxylase 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 Da
References
  1. Girennavar B, Jayaprakasha GK, Patil BS: Potent inhibition of human cytochrome P450 3A4, 2D6, and 2C9 isoenzymes by grapefruit juice and its furocoumarins. J Food Sci. 2007 Oct;72(8):C417-21. [17995595 ]
Target Details
3. Cytochrome P450 3A4
General Function:
Vitamin d3 25-hydroxylase 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 (PubMed:11159812). Catalyzes 4-beta-hydroxylation of cholesterol. May catalyze 25-hydroxylation of cholesterol in vitro (PubMed:21576599).
Gene Name:
CYP3A4
Uniprot ID:
P08684
Molecular Weight:
57342.67 Da
References
  1. Girennavar B, Jayaprakasha GK, Patil BS: Potent inhibition of human cytochrome P450 3A4, 2D6, and 2C9 isoenzymes by grapefruit juice and its furocoumarins. J Food Sci. 2007 Oct;72(8):C417-21. [17995595 ]