Ubiquinone-2 (BioDeep_00000017803)

描述信息

Ubiquinone-2 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-2 has just 2 isoprene units. Normally in humans it has 10. Ubiquinone-2 is an intermediate in the synthesis of Ubiquionone 10. Ubiquionone is involved in cellular respiration. It is fat-soluble and is therefore mobile in cellular membranes; it plays 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.
Coenzyme Q functions as an electron carrier and reversibly changes to either an oxidized (CoQ), intermediate (CoQ), or reduced (CoQH2) form within a biomembrane. The Coenzyme Q2 (CoQH2) form also acts as an antioxidant and prevents cell death, and thus has been successfully used as a supplement. On the other hand, the value of the CoQ/CoQH2 ratio has been shown to increase in a number of diseases, presumably due to an anti-proliferative effect involving CoQ. Induction of apoptosis by CoQ2 is dependent on p53 protein levels. Moreover, CoQ2 induces reactive oxygen species (ROS) and the phosphorylation of p53. An antioxidant, l-ascorbic acid, inhibited CoQ2-induced p53 phosphorylation and further apoptotic stimuli. (PMID: 15905035) [HMDB]
D020011 - Protective Agents > D000931 - Antidotes

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