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discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
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Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
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for maintenance.
Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
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Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
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MetaCyc Compound Class: an electron-transfer-related quinone

Superclasses: a redox electron carrier Membrane-Electron-Carriers
an aldehyde or ketone a ketone a cyclic ketone a quinone

Summary:
This class holds quinones that are involved in electron transfer within membranes.

Child Classes: a demethylmenaquinone (8) , a menaquinone (17) , a plastoquinone (1) , a rhodoquinone (2) , an anthraquinone (2) , an ubiquinone (9)

Instances:
ω-hydroxyphylloquinone ,
asterrate ,
caldariellaquinol ,
caldariellaquinone ,
phylloquinone

Reactions known to consume the compound:

(5R)-carbapenem carboxylate biosynthesis , citrulline biosynthesis , L-Nδ-acetylornithine biosynthesis , proline degradation :
L-proline + an electron-transfer-related quinone[inner membrane] → (S)-1-pyrroline-5-carboxylate + an electron-transfer-related quinol[inner membrane] + H+

4-hydroxymandelate degradation :
(S)-4-hydroxymandelate + an electron-transfer-related quinone → 2-(4-hydroxyphenyl)-2-oxoacetate + an electron-transfer-related quinol

alanine degradation I :
D-alanine + an electron-transfer-related quinone[inner membrane] + H2O → ammonium + pyruvate + an electron-transfer-related quinol[inner membrane]

sulfide oxidation I (sulfide-quinone reductase) :
hydrogen sulfide + an electron-transfer-related quinone → intracellular S0 + an electron-transfer-related quinol

TCA cycle IV (2-oxoglutarate decarboxylase) , TCA cycle V (2-oxoglutarate:ferredoxin oxidoreductase) , TCA cycle VII (acetate-producers) :
succinate[in] + an electron-transfer-related quinone[CCO-OUT-CCO-IN] → fumarate[in] + an electron-transfer-related quinol[CCO-OUT-CCO-IN]

trans-4-hydroxy-L-proline degradation I :
trans-4-hydroxy-L-proline[in] + an electron-transfer-related quinone → pyrroline-hydroxy-carboxylate[in] + an electron-transfer-related quinol + H+[in]

trans-lycopene biosynthesis II (plants) :
9,9'-di-cis-ζ-carotene + an electron-transfer-related quinone → 7,9,9'-cis-neurosporene + an electron-transfer-related quinol
7,9,9'-cis-neurosporene + an electron-transfer-related quinone → prolycopene + an electron-transfer-related quinol

Not in pathways:
sn-glycerol 3-phosphate[in] + an electron-transfer-related quinone[CCO-OUT-CCO-IN] → dihydroxyacetone phosphate[in] + an electron-transfer-related quinol[CCO-OUT-CCO-IN]
D-glucopyranose[out] + an electron-transfer-related quinone + 2 H+[in] → D-glucono-1,5-lactone[out] + an electron-transfer-related quinol + 2 H+[out]
a D-amino acid[in] + an electron-transfer-related quinone[CCO-OUT-CCO-IN] + H2O[in] → a 2-oxo carboxylate[in] + ammonium[in] + an electron-transfer-related quinol[CCO-OUT-CCO-IN]
NADPH + an electron-transfer-related quinone + H+ → NADP+ + an electron-transfer-related quinol
(S)-dihydroorotate + an electron-transfer-related quinone[inner membrane] → orotate + an electron-transfer-related quinol[inner membrane]

quinate degradation I :
L-quinate + a quinone → 3-dehydroquinate + a quinol

shikimate degradation I :
shikimate + a quinone → 3-dehydroshikimate + a quinol

TCA cycle I (prokaryotic) , TCA cycle VII (acetate-producers) :
(S)-malate + a quinone → oxaloacetate + a quinol

thiosulfate oxidation II (to tetrathionate) :
2 thiosulfate + a quinone → tetrathionate + a quinol


a quinone + NAD(P)H + H+ → a quinol + NAD(P)+
a cyclic alcohol + a quinonea cyclic ketone + a quinol


a cyclic alcohol + a quinonea cyclic ketone + a quinol

Reactions known to produce the compound:

methane oxidation to methanol II :
methane + an electron-transfer-related quinol + oxygen → methanol + an electron-transfer-related quinone + H2O

TCA cycle VI (obligate autotrophs) :
succinate[in] + an electron-transfer-related quinone[CCO-OUT-CCO-IN] ← fumarate[in] + an electron-transfer-related quinol[CCO-OUT-CCO-IN]

Not in pathways:
2 an oxidized c-type cytochrome[out] + an electron-transfer-related quinol → 2 a reduced c-type cytochrome[out] + an electron-transfer-related quinone + 2 H+[in]

cuticular wax biosynthesis :
a secondary alcohol + an oxidized electron acceptor → a ketone + a reduced electron acceptor


a secondary alcohol + oxygen → a ketone + hydrogen peroxide


a nitroalkane + oxygen + H2O → an aldehyde or ketone + nitrite + hydrogen peroxide + H+

Reactions known to both consume and produce the compound:

nitrate reduction I (denitrification) , nitrate reduction VII (denitrification) :
nitrate[in] + an electron-transfer-related quinol ↔ nitrite[in] + an electron-transfer-related quinone + H2O[in]

Not in pathways:
a quinone + NADPH ↔ a semiquinone + NADP+

In Reactions of unknown directionality:

Not in pathways:
an oxidized coenzyme F420 + an electron-transfer-related quinol = a reduced coenzyme F420 + an electron-transfer-related quinone
an (R)-2-hydroxyacid + an electron-transfer-related quinone = a 2-oxo acid + an electron-transfer-related quinol
NADH + an electron-transfer-related quinone + H+ = NAD+ + an electron-transfer-related quinol
formate + an electron-transfer-related quinone + H+ = CO2 + an electron-transfer-related quinol
9,9'-di-cis-ζ-carotene + 2 an electron-transfer-related quinone = prolycopene + 2 an electron-transfer-related quinol


phenylacetyl-CoA + 2 a quinone + H2O = 2 a quinol + phenylglyoxylyl-CoA
a quinone + NADH = a semiquinone + NAD+
1-(β-D-ribofuranosyl)-1,4-dihydronicotinamide + a quinone + H+ = a quinol + 1-(β-D ribofuranosyl)nicotinamide


a ketone + NADP+ = an enone + NADPH + H+
a secondary alcohol + an oxidized coenzyme F420 = a ketone + a reduced coenzyme F420
a secondary alcohol + NADP+ = a ketone + NADPH + H+
a secondary alcohol + NAD+ = a ketone + NADH + H+

In Redox half-reactions:
an electron-transfer-related quinone + 2 H+[in] + 2 e- → an electron-transfer-related quinol

This compound has been characterized as a cofactor or prosthetic group of the following enzymes: putrescine oxidase

Credits:
Created 31-Jan-2011 by Caspi R , SRI International


Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 18.5 on Sun Dec 21, 2014, BIOCYC13B.