Record Information
Version2.0
Creation Date2012-08-09 09:25:33 -0600
Update Date2015-06-03 17:21:49 -0600
Secondary Accession Numbers
  • ECMDB21580
Identification
Name:Ubiquinol-9
DescriptionUbiquinol-9 is a member of the chemical class known as Polyprenylbenzoquinols. They are reduced forms of polyprenylbenzoquinines (ubiquinones). These are compounds containing a polyisoprene chain attached to a quinol at the second ring position. Ubiquiol-9 has just 9 isoprene units. Normally in E. coli the active form of Ubiquinol has 8 isoprene units (Ubiquinol-8) and in humans it normally has 10. Ubiquinol-9 is an extended version of Ubiquinol 8 that arises from conjugation by an extended prenyl tail via 4-hydroxybenzoate polyprenyltransferase. Coenzyme Q(n) exists in three redox states, fully oxidized (ubiquinone), partially reduced (semiquinones or ubisemiquinones), and fully reduced (ubiquinols). The redox functions of ubiquinol in cellular energy production and antioxidant protection are based on the ability to exchange two electrons in a redox cycle between ubiquinol (reduced) and the ubiquinone (oxidized) form. Ubiquionols are important in cellular respiration. They are fat-soluble and therefore mobile in cellular membranes; they play a unique role in the electron transport chain (ETC). In the inner bacterial membrane, electrons from NADH and succinate pass through the ETC to the oxygen, which is then reduced to water. The transfer of electrons through ETC results in the pumping of H+ across the membrane creating a proton gradient across the membrane, which is used by ATP synthase (located on the membrane) to generate ATP.
Structure
Thumb
Synonyms:
  • CoQ9
  • Ubiquinol(9)
Chemical Formula:C54H84O4
Weight:Average: 797.2424
Monoisotopic: 796.636961176
InChI Key:NPCOQXAVBJJZBQ-WJNLUYJISA-N
InChI:InChI=1S/C54H84O4/c1-40(2)22-14-23-41(3)24-15-25-42(4)26-16-27-43(5)28-17-29-44(6)30-18-31-45(7)32-19-33-46(8)34-20-35-47(9)36-21-37-48(10)38-39-50-49(11)51(55)53(57-12)54(58-13)52(50)56/h22,24,26,28,30,32,34,36,38,55-56H,14-21,23,25,27,29,31,33,35,37,39H2,1-13H3/b41-24+,42-26+,43-28+,44-30+,45-32+,46-34+,47-36+,48-38+
CAS number:Not Available
IUPAC Name:2,3-dimethoxy-5-methyl-6-[(2E,6E,10E,14E,18E,22E,26E,30E)-3,7,11,15,19,23,27,31,35-nonamethylhexatriaconta-2,6,10,14,18,22,26,30,34-nonaen-1-yl]benzene-1,4-diol
Traditional IUPAC Name:2,3-dimethoxy-5-methyl-6-[(2E,6E,10E,14E,18E,22E,26E,30E)-3,7,11,15,19,23,27,31,35-nonamethylhexatriaconta-2,6,10,14,18,22,26,30,34-nonaen-1-yl]benzene-1,4-diol
SMILES:[H]\C(CC\C(C)=C(/[H])CC\C(C)=C(/[H])CC\C(C)=C(/[H])CC\C(C)=C(/[H])CC\C(C)=C(/[H])CC\C(C)=C(/[H])CC\C(C)=C(/[H])CC1=C(C)C(O)=C(OC)C(OC)=C1O)=C(\C)CCC=C(C)C
Chemical Taxonomy
Description belongs to the class of organic compounds known as polyprenyl quinols. Polyprenyl quinols are compounds containing a polyisoprene chain attached to a quinol(hydroquinone) at the second ring position.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassPrenol lipids
Sub ClassQuinone and hydroquinone lipids
Direct ParentPolyprenyl quinols
Alternative Parents
Substituents
  • Polyterpenoid
  • 2-polyprenyl-6-methoxyphenol
  • Polyprenylbenzoquinol
  • Polyprenylphenol
  • Ubiquinol skeleton
  • Methoxyphenol
  • O-dimethoxybenzene
  • Dimethoxybenzene
  • Anisole
  • Hydroquinone
  • M-cresol
  • Phenoxy compound
  • O-cresol
  • Phenol ether
  • Methoxybenzene
  • Alkyl aryl ether
  • Phenol
  • Toluene
  • Monocyclic benzene moiety
  • Benzenoid
  • Ether
  • Organooxygen compound
  • Organic oxygen compound
  • Hydrocarbon derivative
  • Aromatic homomonocyclic compound
Molecular FrameworkAromatic homomonocyclic compounds
External Descriptors
Physical Properties
State:Not Available
Charge:0
Melting point:Not Available
Experimental Properties:
PropertyValueSource
Predicted Properties
PropertyValueSource
Water Solubility0.00024 g/LALOGPS
logP9.56ALOGPS
logP16.57ChemAxon
logS-6.5ALOGPS
pKa (Strongest Acidic)10.27ChemAxon
pKa (Strongest Basic)-4.7ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area58.92 ŲChemAxon
Rotatable Bond Count28ChemAxon
Refractivity262.65 m³·mol⁻¹ChemAxon
Polarizability103.09 ųChemAxon
Number of Rings1ChemAxon
Bioavailability0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Biological Properties
Cellular Locations:Membrane
Reactions:
SMPDB Pathways:
TCA cycle (ubiquinol-9)PW001009 ThumbThumb?image type=greyscaleThumb?image type=simple
KEGG Pathways:Not Available
EcoCyc Pathways:Not Available
Concentrations
Not Available
Spectra
Spectra:
Spectrum TypeDescriptionSplash Key
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (TMS_1_1) - 70eV, PositiveNot AvailableView in JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0002-0212130900-7b4740cb04f0378cc6f1View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0002-0659384100-afd07c2a0f6c1fc471c8View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-00kb-1354593400-75b223f0b44ea0331e3eView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0002-0000000900-d7e562c74fb2183982acView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-00dj-0000000900-90d594856c756f900ef3View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-00b9-8100005900-3e1b30f2fef64149860aView in MoNA
References
References:
  • Winder, C. L., Dunn, W. B., Schuler, S., Broadhurst, D., Jarvis, R., Stephens, G. M., Goodacre, R. (2008). "Global metabolic profiling of Escherichia coli cultures: an evaluation of methods for quenching and extraction of intracellular metabolites." Anal Chem 80:2939-2948. Pubmed: 18331064
Synthesis Reference:Not Available
Material Safety Data Sheet (MSDS)Not Available
External Links:
ResourceLink
CHEBI ID84424
HMDB IDNot Available
Pubchem Compound ID45281170
Kegg IDNot Available
ChemSpider ID24603697
Wikipedia IDNot Available
BioCyc IDNot Available

Enzymes

General function:
Involved in electron carrier activity
Specific function:
Two distinct, membrane-bound, FAD-containing enzymes are responsible for the catalysis of fumarate and succinate interconversion; the fumarate reductase is used in anaerobic growth, and the succinate dehydrogenase is used in aerobic growth
Gene Name:
sdhB
Uniprot ID:
P07014
Molecular weight:
26770
Reactions
Succinate + acceptor = fumarate + reduced acceptor.
General function:
Involved in electron carrier activity
Specific function:
Two distinct, membrane-bound, FAD-containing enzymes are responsible for the catalysis of fumarate and succinate interconversion; the fumarate reductase is used in anaerobic growth, and the succinate dehydrogenase is used in aerobic growth
Gene Name:
sdhA
Uniprot ID:
P0AC41
Molecular weight:
64421
Reactions
Succinate + acceptor = fumarate + reduced acceptor.
General function:
Involved in succinate dehydrogenase activity
Specific function:
Membrane-anchoring subunit of succinate dehydrogenase (SDH)
Gene Name:
sdhD
Uniprot ID:
P0AC44
Molecular weight:
12867
General function:
Involved in 2-polyprenyl-6-methoxy-1,4-benzoquinone methyltransferase activity
Specific function:
S-adenosyl-L-methionine + 3- demethylubiquinone-9 = S-adenosyl-L-homocysteine + ubiquinone-9
Gene Name:
ubiG
Uniprot ID:
P17993
Molecular weight:
26555
Reactions
S-adenosyl-L-methionine + 3-demethylubiquinone-n = S-adenosyl-L-homocysteine + ubiquinone-n.
S-adenosyl-L-methionine + 3-(all-trans-polyprenyl)benzene-1,2-diol = S-adenosyl-L-homocysteine + 2-methoxy-6-(all-trans-polyprenyl)phenol.
General function:
Involved in succinate dehydrogenase activity
Specific function:
Membrane-anchoring subunit of succinate dehydrogenase (SDH)
Gene Name:
sdhC
Uniprot ID:
P69054
Molecular weight:
14299
General function:
Involved in cytochrome bo3 ubiquinol oxidase activity
Specific function:
Cytochrome o terminal oxidase complex is the component of the aerobic respiratory chain of E.coli that predominates when cells are grown at high aeration
Gene Name:
cyoA
Uniprot ID:
P0ABJ1
Molecular weight:
34911
Reactions
Ubiquinol-8 + O(2) = Ubiquinone-8 + H(2)O.
General function:
Involved in cytochrome-c oxidase activity
Specific function:
Cytochrome o terminal oxidase complex is the component of the aerobic respiratory chain of E.coli that predominates when cells are grown at high aeration. This ubiquinol oxidase shows proton pump activity across the membrane in addition to the electron transfer
Gene Name:
cyoB
Uniprot ID:
P0ABI8
Molecular weight:
74367
Reactions
Ubiquinol-8 + O(2) = Ubiquinone-8 + H(2)O.