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Record Information
StatusExpected but not Quantified
Creation Date2007-07-11 09:24:51 UTC
Update Date2020-02-26 21:26:41 UTC
Secondary Accession Numbers
  • HMDB06710
Metabolite Identification
Common NameUbiquinone-4
DescriptionUbiquinone-4 is a member of the chemical class known as Polyprenylbenzoquinones. These are compounds containing a polyisoprene chain attached to a quinone at the second ring position. Ubiquione-4 has just 4 isoprene units. Normally in humans it has 10 (CoQ10). Ubiquinone-4 is an intermediate in the synthesis of Ubiquionone 10. Ubiquinone-4 is a Coenzyme Q analogue that have been identified in brain. Based on the isoprenoid moiety, the presence of various coenzyme Q homologues in prokaryotes and eurkaryotes has been confirmed, and these homologues are classified as Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, and Q12. The numbers, Qn, refer to the number of isoprenoid units attached at the 6- position on the benzoquinone ring of the coenzyme Q moiety. (PMID: 12064350 ) Coenzyme Q is the only type of Quinone naturally found in animals (other quinones such as vitamin K is provided by foods). Coenzyme Q is a fat-soluble and amphipathic compound that is the integral component of the electron transport chain in mitochondria. It is ubiquitous in nature and is found in subcellular organelles, serum lipoproteins, blood plasma, urine, and feces. Ubiquinones are amphipathic because of the benzoquinone ring (hydrophilic) and the polyisoprenoid side chain moiety (lipophilic). The primary role of coenzyme Q is to transfer electrons between redox components of the electron transport chain, to create a proton gradient across the inner mitochondrial membrane and drive ATP formation. Additional functions of coenzyme Q are to influence membrane fluidity; to recycle the radical forms of vitamin C and E; and, most important, to act as a lipid antioxidant protecting membrane phospholipids against peroxidation. Coenzyme Q is the only endogenously occurring lipid-soluble antioxidant that occurs ubiquitously and can be synthesized in all organisms.
Coenzyme Q4HMDB
Ubiquinone 4HMDB
Ubiquinone Q4HMDB
Chemical FormulaC29H42O4
Average Molecular Weight454.6414
Monoisotopic Molecular Weight454.308309832
IUPAC Name2,3-dimethoxy-5-methyl-6-[(2E,6E,10E)-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraen-1-yl]cyclohexa-2,5-diene-1,4-dione
Traditional Nameubiquinone 4
CAS Registry Number4370-62-1
InChI Identifier
Chemical Taxonomy
Description belongs to the class of organic compounds known as ubiquinones. These are coenzyme Q derivatives containing a 5, 6-dimethoxy-3-methyl(1,4-benzoquinone) moiety to which an isoprenyl group is attached at ring position 2(or 6).
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassPrenol lipids
Sub ClassQuinone and hydroquinone lipids
Direct ParentUbiquinones
Alternative Parents
  • Diterpenoid
  • Ubiquinone skeleton
  • Quinone
  • P-benzoquinone
  • Vinylogous ester
  • Cyclic ketone
  • Ketone
  • Organic oxygen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Organooxygen compound
  • Carbonyl group
  • Aliphatic homomonocyclic compound
Molecular FrameworkAliphatic homomonocyclic compounds
External Descriptors

Route of exposure:


Biological location:


Naturally occurring process:


Biological role:

Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.00089 g/LALOGPS
pKa (Strongest Basic)-4.7ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count0ChemAxon
Polar Surface Area52.6 ŲChemAxon
Rotatable Bond Count13ChemAxon
Refractivity143.79 m³·mol⁻¹ChemAxon
Polarizability55.21 ųChemAxon
Number of Rings1ChemAxon
Rule of FiveNoChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Spectrum TypeDescriptionSplash KeyView
GC-MSGC-MS Spectrum - GC-MS (2 TMS)splash10-0006-8569000000-59442bb36544f3769091Spectrum
GC-MSGC-MS Spectrum - GC-MS (2 TMS)splash10-000x-7689001000-c8660617cb5cd593222bSpectrum
GC-MSGC-MS Spectrum - GC-MS (Non-derivatized)splash10-0006-8569000000-59442bb36544f3769091Spectrum
GC-MSGC-MS Spectrum - GC-MS (Non-derivatized)splash10-000x-7689001000-c8660617cb5cd593222bSpectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-000i-2559500000-8b9beaf0f7bae959247eSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0a4i-0222900000-7068674fa2846a47c74dSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-059e-1974200000-fca47eaee65794b87205Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-014r-7479000000-faf4846ac88a76e1061dSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0udi-0001900000-e42e8d16aa71cad12871Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0udj-0108900000-f9427f19705024476e83Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-000i-9106400000-f3a6445d4e177a9e3c4eSpectrum
Biological Properties
Cellular Locations
  • Membrane (predicted from logP)
Biospecimen LocationsNot Available
Tissue LocationsNot Available
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
Phenol Explorer Compound IDNot Available
FooDB IDFDB018340
KNApSAcK IDNot Available
Chemspider ID4446658
KEGG Compound IDNot Available
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkNot Available
METLIN IDNot Available
PubChem Compound5283545
PDB IDNot Available
ChEBI ID529178
Food Biomarker OntologyNot Available
VMH IDNot Available
MarkerDB ID
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Albano CB, Muralikrishnan D, Ebadi M: Distribution of coenzyme Q homologues in brain. Neurochem Res. 2002 May;27(5):359-68. [PubMed:12064350 ]