Classification Term: 169899
Ubiquinones (ontology term: 55c563aea127f720947e240520444f27)
found 30 associated metabolites at sub_class metabolite taxonomy ontology rank level.
Ancestor: Quinones and hydroquinones
Child Taxonomies: There is no child term of current ontology term.
Coenzyme Q10
Coenzyme Q10 (ubiquinone) is a naturally occurring compound widely distributed in animal organisms and in humans. The primary compounds involved in the biosynthesis of ubiquinone are 4-hydroxybenzoate and the polyprenyl chain. An essential role of coenzyme Q10 is as an electron carrier in the mitochondrial respiratory chain. Moreover, coenzyme Q10 is one of the most important lipophilic antioxidants, preventing the generation of free radicals as well as oxidative modifications of proteins, lipids, and DNA, it and can also regenerate the other powerful lipophilic antioxidant, alpha-tocopherol. Antioxidant action is a property of the reduced form of coenzyme Q10, ubiquinol (CoQ10H2), and the ubisemiquinone radical (CoQ10H*). Paradoxically, independently of the known antioxidant properties of coenzyme Q10, the ubisemiquinone radical anion (CoQ10-) possesses prooxidative properties. Decreased levels of coenzyme Q10 in humans are observed in many pathologies (e.g. cardiac disorders, neurodegenerative diseases, AIDS, cancer) associated with intensive generation of free radicals and their action on cells and tissues. In these cases, treatment involves pharmaceutical supplementation or increased consumption of coenzyme Q10 with meals as well as treatment with suitable chemical compounds (i.e. folic acid or B-group vitamins) which significantly increase ubiquinone biosynthesis in the organism. Estimation of coenzyme Q10 deficiency and efficiency of its supplementation requires a determination of ubiquinone levels in the organism. Therefore, highly selective and sensitive methods must be applied, such as HPLC with UV or coulometric detection. For a number of years, coenzyme Q (CoQ10 in humans) was known for its key role in mitochondrial bioenergetics; later studies demonstrated its presence in other subcellular fractions and in plasma, and extensively investigated its antioxidant role. These two functions constitute the basis on which research supporting the clinical use of CoQ10 is founded. Also at the inner mitochondrial membrane level, coenzyme Q is recognized as an obligatory co-factor for the function of uncoupling proteins and a modulator of the transition pore. Furthermore, recent data reveal that CoQ10 affects expression of genes involved in human cell signalling, metabolism, and transport and some of the effects of exogenously administered CoQ10 may be due to this property. Coenzyme Q is the only lipid soluble antioxidant synthesized endogenously. In its reduced form, CoQH2, ubiquinol, inhibits protein and DNA oxidation but it is the effect on lipid peroxidation that has been most deeply studied. Ubiquinol inhibits the peroxidation of cell membrane lipids and also that of lipoprotein lipids present in the circulation. Dietary supplementation with CoQ10 results in increased levels of ubiquinol-10 within circulating lipoproteins and increased resistance of human low-density lipoproteins to the initiation of lipid peroxidation. Moreover, CoQ10 has a direct anti-atherogenic effect, which has been demonstrated in apolipoprotein E-deficient mice fed with a high-fat diet. (PMID: 15928598, 17914161). COVID info from clinicaltrial, clinicaltrials, clinical trial, clinical trials C - Cardiovascular system > C01 - Cardiac therapy C26170 - Protective Agent > C275 - Antioxidant D018977 - Micronutrients > D014815 - Vitamins Same as: D01065 Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
Coenzyme Q9
Coenzyme Q9 (CoQ9) is a normal constituent of human plasma. CoQ9 in human plasma may originate as a product of incomplete CoQ10 biosynthesis or from the diet. The estimated dietary CoQ9 intake is 0 to 1.3 umol/day, primarily from cereals and fats, but this is unreliable because many food items contain levels below the detection limit. Plasma CoQ9 increases after supplementation with CoQ10, and CoQ9 and CoQ10 are significantly correlated. (PMID: 17405953). D020011 - Protective Agents > D000975 - Antioxidants Coenzyme Q9 (Ubiquinone Q9), the major form of ubiquinone in rodents, is an amphipathic molecular component of the electron transport chain that functions as an endogenous antioxidant. Coenzyme Q9 attenuates the diabetes-induced decreases in antioxidant defense mechanisms. Coenzyme Q9 improves left ventricular performance and reduces myocardial infarct size and cardiomyocyte apoptosis[1][2]. Coenzyme Q9 (Ubiquinone Q9), the major form of ubiquinone in rodents, is an amphipathic molecular component of the electron transport chain that functions as an endogenous antioxidant. Coenzyme Q9 attenuates the diabetes-induced decreases in antioxidant defense mechanisms. Coenzyme Q9 improves left ventricular performance and reduces myocardial infarct size and cardiomyocyte apoptosis[1][2].
3-Demethylubiquinone-9
This compound belongs to the family of 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).
2-Hexaprenyl-6-methoxyphenol
2-Hexaprenyl-6-methoxyphenol is involved in the ubiquinone biosynthesis pathway. 2-Hexaprenyl-6-methoxyphenol is created from 3-Hexaprenyl-4-hydroxy-5-methoxybenzoate. 2-Hexaprenyl-6-methoxyphenol is then converted into 2-Hexaprenyl-6-methoxy-1,4-benzoquinone by ubiquinone biosynthesis monooxygenase Coq6 [EC:1.14.13.-]. [HMDB] 2-Hexaprenyl-6-methoxyphenol is involved in the ubiquinone biosynthesis pathway. 2-Hexaprenyl-6-methoxyphenol is created from 3-Hexaprenyl-4-hydroxy-5-methoxybenzoate. 2-Hexaprenyl-6-methoxyphenol is then converted into 2-Hexaprenyl-6-methoxy-1,4-benzoquinone by ubiquinone biosynthesis monooxygenase Coq6 [EC:1.14.13.-].
Menaquinone-9
A menaquinone whose side-chain contains 9 isoprene units in an all-trans-configuration.
Ubiquinone-1
Ubiquinone-1 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-1 has just 1 isoprene unit. Normally in humans it has 10. Ubiquinone-1 is an intermediate in the synthesis of Ubiquionone 10, which is also called Coenzyme Q (CoQ). CoQ is found in the membranes of endoplasmic reticulum, peroxisomes, lysosomes, vesicles and notably the inner membrane of the mitochondrion where it is an important part of the electron transport chain; there it passes reducing equivalents to acceptors such as Coenzyme Q : cytochrome c - oxidoreductase. CoQ is also essential in the formation of the apoptosome along with other adapter proteins. The loss of trophic factors activates pro-apoptotic enzymes, causing the breakdown of mitochondria. Because of its ability to transfer electrons and therefore act as an antioxidant, Coenzyme Q has become a valued dietary supplement. CoQ10 has been widely used for the treatment of heart disease (especially heart failure), gum diseases, and also breast cancer. The benzoquinone portion of Coenzyme Q10 is synthesized from amino acids, while the isoprene sidechain is synthesized from acetyl CoA through the mevalonate pathway. The mevalonate pathway is used for the first steps of cholesterol biosynthesis. A compound composed of the standard 2,3-dimethoxy-5-methylbenzoquinone nucleus common to ubiquinones; and a side chain of a single isoprenoid unit. [ChEBI] COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
Ubiquinol-10
Ubiquinol-10 is a benzoquinol and is the reduced product of ubiquinone also called coenzyme Q10.The reduction of ubiquinone to ubiquinol occurs in Complexes I&II in the electron transfer chain. The Q cycle is a process that occurs in cytochrome b[, a component of Complex III in the electron transport chain,and that converts ubiquinol to ubiquinone in a cyclic fashion. When ubiquinol binds to cytochrome b, the pKa of the phenolic group decreases so that the proton ionizes and the phenoxide anion is formed (Wikipedia). Ubiquinol-10, the reduced form of ubiquinone-10, efficiently scavenges free radicals generated chemically within liposomal membranes. Ubiquinol-10 is about as effective in preventing peroxidative damage to lipids as alpha-tocopherol, which is considered the best lipid-soluble antioxidant in humans. The number of radicals scavenged by each molecule of ubiquinol-10 is 1.1 under certain experimental conditions. In contrast to alpha-tocopherol, ubiquinol-10 is not recycled by ascorbate. However, it is known that ubiquinol-10 can be recycled by electron transport carriers present in various biomembranes and possibly by some enzymes. It is shown that ubiquinol-10 spares alpha-tocopherol when both antioxidants are present in the same liposomal membranes and that ubiquinol-10, like alpha-tocopherol, does not interact with reduced glutathione.It is suggested that ubiquinol-10 is an important physiological lipid-soluble antioxidant. [PMID: 2352956]. Ubiquinol-10 is a benzoquinol and is the reduced product of ubiquinone also called coenzyme Q10.The reduction of ubiquinone to ubiquinol occurs in Complexes I&II in the electron transfer chain. The Q cycle is a process that occurs in cytochrome b[, a component of Complex III in the electron transport chain,and that converts ubiquinol to ubiquinone in a cyclic fashion. When ubiquinol binds to cytochrome b, the pKa of the phenolic group decreases so that the proton ionizes and the phenoxide anion is formed (from wiki) COVID info from COVID-19 Disease Map, clinicaltrial, clinicaltrials, clinical trial, clinical trials Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
Ubiquinol-6
UbUbiquinone(Q) is an essential, lipid soluble, redox component of the mitochondrial respiratory chain. Much evidence suggests that ubiquinol (QH2) functions as an effective antioxidant in a number of membrane and biological systems by preventing peroxidative damage to lipids. It has been proposed that superoxide dismutase (SOD) may protect QH2 from autoxidation by acting either directly as a superoxide−semiquinone oxidoreductase or indirectly by scavenging superoxide. (Biochemistry, 1996, 35 (21), pp 6595 - 6603) [HMDB] UbUbiquinone(Q) is an essential, lipid soluble, redox component of the mitochondrial respiratory chain. Much evidence suggests that ubiquinol (QH2) functions as an effective antioxidant in a number of membrane and biological systems by preventing peroxidative damage to lipids. It has been proposed that superoxide dismutase (SOD) may protect QH2 from autoxidation by acting either directly as a superoxide−semiquinone oxidoreductase or indirectly by scavenging superoxide. (Biochemistry, 1996, 35 (21), pp 6595 - 6603).
Menaquinone-9
ubiquinol-8
Ubiquinol 8 is a member of the class of compounds known as polyterpenoids. Polyterpenoids are terpenoids consisting of more than eight isoprene units. Ubiquinol 8 is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). Ubiquinol 8 can be found in a number of food items such as garden cress, lupine, feijoa, and coriander, which makes ubiquinol 8 a potential biomarker for the consumption of these food products. Ubiquinol 8 can be found primarily in blood. Ubiquinol 8 exists in all living species, ranging from bacteria to humans. In humans, ubiquinol 8 is involved in mitochondrial electron transport chain, which is a metabolic disorder. Moreover, ubiquinol 8 is found to be associated with beta-thalassemia.
idebenone
N - Nervous system > N06 - Psychoanaleptics > N06B - Psychostimulants, agents used for adhd and nootropics D020011 - Protective Agents > D000975 - Antioxidants C26170 - Protective Agent > C275 - Antioxidant Idebenone, a well-appreciated mitochondrial protectant, exhibits protective efficacy against neurotoxicity and can be used for the research of Alzheimer's disease, Huntington's disease. Idebenone (oxidised form) has a dose-dependent inhibitory effect on the enzymatic metabolism of arachidonic acid in astroglial homogenates (IC50=16.65 μM)[1]. Idebenone, a coenzyme Q10 analog and an antioxidant, induces apoptotic cell death in the human dopaminergic neuroblastoma SHSY-5Y cells[2]. Idebenone quickly crosses the blood-brain barrier.
Coenzyme Q4
Ubiquinol-8
Coenzyme Q9
D020011 - Protective Agents > D000975 - Antioxidants Coenzyme Q9 (Ubiquinone Q9), the major form of ubiquinone in rodents, is an amphipathic molecular component of the electron transport chain that functions as an endogenous antioxidant. Coenzyme Q9 attenuates the diabetes-induced decreases in antioxidant defense mechanisms. Coenzyme Q9 improves left ventricular performance and reduces myocardial infarct size and cardiomyocyte apoptosis[1][2]. Coenzyme Q9 (Ubiquinone Q9), the major form of ubiquinone in rodents, is an amphipathic molecular component of the electron transport chain that functions as an endogenous antioxidant. Coenzyme Q9 attenuates the diabetes-induced decreases in antioxidant defense mechanisms. Coenzyme Q9 improves left ventricular performance and reduces myocardial infarct size and cardiomyocyte apoptosis[1][2].
3-Demethylubiquinone-9
2-Hexaprenyl-6-methoxyphenol
A monomethoxybenzene that is 6-methoxyphenol substituted by a (all-trans)-hexaprenyl group at position 2.
coenzyme Q10
A ubiquinone having a side chain of 10 isoprenoid units. In the naturally occurring isomer, all isoprenyl double bonds are in the E- configuration. COVID info from clinicaltrial, clinicaltrials, clinical trial, clinical trials C - Cardiovascular system > C01 - Cardiac therapy C26170 - Protective Agent > C275 - Antioxidant D018977 - Micronutrients > D014815 - Vitamins Same as: D01065 Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS Isolated from beef heart. Ubiquinone 10 is found in animal foods.
Ubiquinone-1
A compound composed of the standard 2,3-dimethoxy-5-methylbenzoquinone nucleus common to ubiquinones; and a side chain of a single isoprenoid unit. COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS