coenzyme A

coenzyme

 [ko-en´zīm]

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 a coenzyme essential for carbohydrate and fat metabolism; among its constituents are pantothenic acid and a terminal SH group, which forms linkages with various acids, e.g., acetic acid (acetyl CoA) and fatty acids (acyl CoA); abbreviated CoA.

coenzyme Q any of a group of related quinones occurring 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.

co·en·zyme A (CoA),

(kō-en'zīm),

A coenzyme containing pantothenic acid, adenosine 3'-phosphate 5'-pyrophosphate, and cysteamine; involved in the transfer of acyl groups, notably in transacetylations.

coenzyme A

n. Abbr. CoA

A coenzyme present in all living cells that transfers acetyl or acyl groups in metabolic reactions and that regulates gene expression through acetylation of histones.

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.

co·en·zyme A

(CoA) (kō-en'zīm)

A coenzyme containing pantothenic acid, adenosine 3'-phosphate 5'-pyrophosphate, and cysteamine; involved in the transfer of acyl groups, notably in transacetylations.

coenzyme A

see ACETYLCOENZYME A.

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).

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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.