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coenzyme A |
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coenzyme /co·en·zyme/ (ko-en´zīm) an organic nonprotein molecule, frequently a phosphorylated derivative of a water-soluble vitamin, that binds with the protein molecule (apoenzyme) to form the active enzyme (holoenzyme). coenzyme A a coenzyme containing among its constituents pantothenic acid and a terminal thiol group that forms high-energy thioester linkages with various acids, e.g., acetic acid (acetyl CoA) and fatty acids (acyl CoA); these thioesters play a central role in the tricarboxylic acid cycle, the transfer of acetyl groups, and the oxidation of fatty acids. Abbreviated CoA and CoA-SH. coenzyme Q , coenzyme Q10 ubiquinone.
coenzyme A (CoA) Etymology: L, cum + en, into, zyme, ferment an important metabolite in the citric acid cycle. Although not a true enzyme, it plays a significant role in the transfer of acetyl groups and the metabolism of acids and amino acids. coenzyme A (CoA), n an important metabolite in the citric acid cycle. Although not a true enzyme, it plays a significant role in the transfer of acetyl groups and the metabolism of acids and amino acids. coenzyme an organic molecule, usually containing phosphorus and some vitamins, often separable from the enzyme protein but essential as a cosubstrate in catalysis; a coenzyme and an apoenzyme must unite in order to function (as a holoenzyme). coenzyme A essential for carbohydrate and fat metabolism; among its constituents are pantothenic acid and a terminal SH group, which forms thioester linkages with various acids, e.g. acetic acid (acetyl-CoA) and fatty acids (acyl-CoA); abbreviated CoA. coenzyme A acetoacetyl see acetoacetyl coa. coenzyme A acetyl see acetyl coa. coenzyme Q any of a group of related quinones with isoprenoid units in the side chains (the ubiquinones), occurring in the lipid fraction of mitochondria and serving, along with the cytochromes, as an intermediate in electron transport; they are similar in structure to vitamin K1. coenzyme R see biotin. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Because coenzyme A acts in conjunction with other enzymes to facilitate reactions in living organisms, the authors believe it may have "acted in this capacity very early in the development of life on Earth. BelleDerm Trim & Tone Gel also includes microbeads that carry vitamin C to promote skin firming, and coenzyme A to aid in metabolism and boost energy. The studies evaluated AVI's NEUGENE(R) antisense compound targeting HMG coenzyme A (CoA) reductase, a liver enzyme involved in the production of cholesterol. |
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