coenzyme
(ko-enīzīm)
an organic molecule, usually containing phosphorus and some vitamins, sometimes separable from the enzyme protein; a coenzyme and an apoenzyme must unite in order to function (as a holoenzyme).
coenzyme A(CoA)
a coenzyme essential for carbohydrate and fat metabolism; among its constituents are pantothenic acid and a terminal SH group, which can form linkages with various acids, such as acetic acid (acetylcoenzyme a) and fatty acids (acyl CoA).
coenzyme Q
any of a group of related substances found in the lipid fraction of mitochondria and serving, along with the cytochromes, as an intermediate in electron transport; they are similar in structure and function to vitamin K1. Called also ubiquinone.

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