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Record Information
Version4.0
StatusDetected and Quantified
Creation Date2005-11-16 15:48:42 UTC
Update Date2018-05-18 01:49:02 UTC
HMDB IDHMDB0001304
Secondary Accession Numbers
  • HMDB01304
Metabolite Identification
Common NameQH2
DescriptionReduced form of ubiquinone, a mobile electron transporter between complex I and III, or II and III of the electron transport chain. Both at complex I or complex II, two electrons and two protons are passed to ubiquinone reducing it to ubiquinol.
Structure
Thumb
Synonyms
ValueSource
CoQH2Kegg
Coenzymes QH2HMDB
Reduced ubiquinoneHMDB
UbiquinolHMDB
Ubiquinone-1HMDB
Coenzyme Q10, reducedMeSH
Ubiquinol-10MeSH
Chemical Formula(C5H8)nC14H20O4
Average Molecular WeightNot Available
Monoisotopic Molecular WeightNot Available
IUPAC NameNot Available
Traditional NameNot Available
CAS Registry Number56275-39-9
SMILES
COC1=C(O)C(C)=C(C\C=C(/C)CCC=C(C)C)C(O)=C1OC
InChI Identifier
InChI=1S/C19H28O4/c1-12(2)8-7-9-13(3)10-11-15-14(4)16(20)18(22-5)19(23-6)17(15)21/h8,10,20-21H,7,9,11H2,1-6H3/b13-10+
InChI KeyRNUCUWWMTTWKAH-JLHYYAGUSA-N
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as ubiquinols. These are coenzyme Q derivatives containing a 5, 6-dimethoxy-3-methylbenzene-1,4-diol 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 ParentUbiquinols
Alternative Parents
Substituents
  • Ubiquinol skeleton
  • Aromatic monoterpenoid
  • Methoxyphenol
  • Monocyclic monoterpenoid
  • Monoterpenoid
  • O-dimethoxybenzene
  • Dimethoxybenzene
  • Anisole
  • Phenoxy compound
  • Hydroquinone
  • M-cresol
  • Methoxybenzene
  • O-cresol
  • Phenol ether
  • Alkyl aryl ether
  • Phenol
  • Toluene
  • Monocyclic benzene moiety
  • Benzenoid
  • Ether
  • Hydrocarbon derivative
  • Organic oxygen compound
  • Organooxygen compound
  • Aromatic homomonocyclic compound
Molecular FrameworkAromatic homomonocyclic compounds
External DescriptorsNot Available
Ontology
Physiological effect

Health effect:

Disposition

Route of exposure:

Source:

Biological location:

Process

Naturally occurring process:

Role

Industrial application:

Biological role:

Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
PropertyValueSource
logP4.41ALOGPS
logS-4.4ALOGPS
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-0a4r-4193000000-48fe18179b80bb21b5c7View in MoNA
Biological Properties
Cellular Locations
  • Extracellular
  • Membrane
  • Inner mitochondrial membrane
Biospecimen Locations
  • Blood
Tissue Location
  • Epidermis
  • Muscle
  • Skeletal Muscle
  • Testes
Pathways
Normal Concentrations
Not Available
Abnormal Concentrations
BiospecimenStatusValueAgeSexConditionReferenceDetails
BloodDetected and Quantified7.4 +/- 2.7 uMAdult (>18 years old)Both
Heart failure
details
Associated Disorders and Diseases
Disease References
Heart failure
  1. Bhagavan HN, Chopra RK: Plasma coenzyme Q10 response to oral ingestion of coenzyme Q10 formulations. Mitochondrion. 2007 Jun;7 Suppl:S78-88. Epub 2007 Mar 27. [PubMed:17482886 ]
Associated OMIM IDsNone
DrugBank IDNot Available
Phenol Explorer Compound IDNot Available
FoodDB IDFDB022543
KNApSAcK IDNot Available
Chemspider ID4444052
KEGG Compound IDC00390
BioCyc IDQH2
BiGG IDNot Available
Wikipedia LinkNot Available
METLIN ID6146
PubChem Compound5280344
PDB IDNot Available
ChEBI IDNot Available
References
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Shindo Y, Witt E, Han D, Epstein W, Packer L: Enzymic and non-enzymic antioxidants in epidermis and dermis of human skin. J Invest Dermatol. 1994 Jan;102(1):122-4. [PubMed:8288904 ]
  2. Passi S, Grandinetti M, Maggio F, Stancato A, De Luca C: Epidermal oxidative stress in vitiligo. Pigment Cell Res. 1998 Apr;11(2):81-5. [PubMed:9585244 ]
  3. Neuzil J, Stocker R: Free and albumin-bound bilirubin are efficient co-antioxidants for alpha-tocopherol, inhibiting plasma and low density lipoprotein lipid peroxidation. J Biol Chem. 1994 Jun 17;269(24):16712-9. [PubMed:8206992 ]
  4. Mohr D, Umeda Y, Redgrave TG, Stocker R: Antioxidant defenses in rat intestine and mesenteric lymph. Redox Rep. 1999;4(3):79-87. [PubMed:10496410 ]
  5. Kontush A, Spranger T, Reich A, Baum K, Beisiegel U: Lipophilic antioxidants in blood plasma as markers of atherosclerosis: the role of alpha-carotene and gamma-tocopherol. Atherosclerosis. 1999 May;144(1):117-22. [PubMed:10381285 ]
  6. Halliwell B, Hu ML, Louie S, Duvall TR, Tarkington BK, Motchnik P, Cross CE: Interaction of nitrogen dioxide with human plasma. Antioxidant depletion and oxidative damage. FEBS Lett. 1992 Nov 16;313(1):62-6. [PubMed:1426270 ]
  7. Peltola V, Huhtaniemi I, Metsa-Ketela T, Ahotupa M: Induction of lipid peroxidation during steroidogenesis in the rat testis. Endocrinology. 1996 Jan;137(1):105-12. [PubMed:8536600 ]
  8. Miles L, Miles MV, Tang PH, Horn PS, Wong BL, DeGrauw TJ, Morehart PJ, Bove KE: Muscle coenzyme Q: a potential test for mitochondrial activity and redox status. Pediatr Neurol. 2005 May;32(5):318-24. [PubMed:15866432 ]
  9. Lonnrot K, Metsa-Ketela T, Molnar G, Ahonen JP, Latvala M, Peltola J, Pietila T, Alho H: The effect of ascorbate and ubiquinone supplementation on plasma and CSF total antioxidant capacity. Free Radic Biol Med. 1996;21(2):211-7. [PubMed:8818636 ]
  10. Kontush A, Reich A, Baum K, Spranger T, Finckh B, Kohlschutter A, Beisiegel U: Plasma ubiquinol-10 is decreased in patients with hyperlipidaemia. Atherosclerosis. 1997 Feb 28;129(1):119-26. [PubMed:9069526 ]
  11. Hargreaves P, Rahman S, Guthrie P, Taanman JW, Leonard JV, Land JM, Heales SJ: Diagnostic value of succinate ubiquinone reductase activity in the identification of patients with mitochondrial DNA depletion. J Inherit Metab Dis. 2002 Feb;25(1):7-16. [PubMed:12004863 ]

Only showing the first 10 proteins. There are 55 proteins in total.

Enzymes

General function:
Involved in oxidation reduction
Specific function:
Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity).
Gene Name:
MT-ND1
Uniprot ID:
P03886
Molecular weight:
35660.055
Reactions
QH2 + Acceptor → Ubiquinone-2 + Reduced acceptordetails
General function:
Involved in NADH dehydrogenase activity
Specific function:
Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone
Gene Name:
NDUFB1
Uniprot ID:
O75438
Molecular weight:
6961.2
General function:
Involved in oxidoreductase activity, acting on NADH or NADPH
Specific function:
Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity).
Gene Name:
NDUFS2
Uniprot ID:
O75306
Molecular weight:
51851.59
General function:
Involved in succinate dehydrogenase activity
Specific function:
Membrane-anchoring subunit of succinate dehydrogenase (SDH) that is involved in complex II of the mitochondrial electron transport chain and is responsible for transferring electrons from succinate to ubiquinone (coenzyme Q).
Gene Name:
SDHC
Uniprot ID:
Q99643
Molecular weight:
16650.185
Reactions
Ubiquinone-2 + Succinic acid → QH2 + Fumaric aciddetails
General function:
Involved in NADH dehydrogenase (ubiquinone) activity
Specific function:
Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone
Gene Name:
NDUFA12
Uniprot ID:
Q9UI09
Molecular weight:
17114.4
General function:
Involved in NADH dehydrogenase (ubiquinone) activity
Specific function:
Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone
Gene Name:
NDUFA1
Uniprot ID:
O15239
Molecular weight:
8072.3
General function:
Not Available
Specific function:
Not Available
Gene Name:
NDUFA4L2
Uniprot ID:
Q9NRX3
Molecular weight:
9965.6
General function:
Involved in NADH dehydrogenase (ubiquinone) activity
Specific function:
Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone
Gene Name:
NDUFA3
Uniprot ID:
O95167
Molecular weight:
9278.8
General function:
Involved in NADH dehydrogenase (ubiquinone) activity
Specific function:
Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone
Gene Name:
NDUFA8
Uniprot ID:
P51970
Molecular weight:
20104.9
General function:
Involved in NADH dehydrogenase (ubiquinone) activity
Specific function:
Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed to be not involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone
Gene Name:
NDUFA4
Uniprot ID:
O00483
Molecular weight:
9369.8

Only showing the first 10 proteins. There are 55 proteins in total.