A 2,3-dimethoxy-5-methyl-1,4-benzoquinone with a multiprenyl side chain; a mobile component of electron transport. SEE ALSO: coenzyme Q.
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ubi·qui·none yü-'bik-wə-.nōn, .yü-bi-kwi-'nōn n any of a group of lipid-soluble quinones that contain a long isoprenoid side chain and that function in the part of cellular respiration comprising oxidative phosphorylation as electron-carrying coenzymes in the transport of electrons from organic substrates to oxygen esp. along the chain of reactions leading from the Krebs cycle esp coenzyme Q10
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n.
a coenzyme that acts as an electron transfer agent in the mitochondria of cells (see electron transport chain).
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ubi·qui·none (u″bĭ-kwĭ-nōnґ) a quinone derivative with a variable length side chain of isoprene units; in mammals it usually contains ten such units. It occurs in the lipid core of inner mitochondrial membranes and functions in the electron transport chain (q.v.), acting as a point of entry for electrons from FAD and transferring them to ubiquinol–cytochrome-c reductase. In naturopathic practice it is administered for a wide variety of indications, and it is used as a dietary supplement for its antioxidant properties. Abbreviated Q or Q10. Called also coenzyme Q, coenzyme Q10>, and ubidecarenone.Medical dictionary. 2011.