activated choline |
An intermediate in the formation of phosphatidylcholine (lecithin); formed by the action of cytidine 5'-triphosphate on phosphocholine, linking the choline phosphate group to the alpha-phosphate of the cytidine 5'-triphosphate to give a pyrophosphate.
Synonym: activated choline, cytidine diphosphate choline.
(05 Mar 2000) |
CDP-choline |
<abbreviation> Cytidine diphosphocholine.
(05 Mar 2000) |
ch3 choline |
<chemistry> An alcohol [formula: HO-CH2-CH2-N(CH3)2] which is a part of acetylcholine, a chemical that transmits information between nerve cells.
(21 Mar 1998) |
choline |
<biochemistry> Esterified in the head group of phospholipids (phosphatidylcholine and sphingomyelin) and in the neurotransmitter acetylcholine. Otherwise a biological source of methyl groups.
(18 Nov 1997) |
choline acetylase |
<enzyme> An enzyme that controls the production of acetylcholine, appears to be depleted in the brains of alzheimer patients.
(22 May 1997) |
choline acetyltransferase |
<enzyme> An enzyme that controls the production of acetylcholine, appears to be depleted in the brains of alzheimer patients.
(22 May 1997) |
choline chloride |
<chemical> A lipotropic agent.
(05 Mar 2000) |
choline deficiency |
A condition produced by a deficiency of choline in animals. Choline is known as a lipotropic agent because it has been shown to promote the transport of excess fat from the liver under certain conditions in laboratory animals. Combined deficiency of choline (included in the b vitamin complex) and all other methyl group donors causes liver cirrhosis in some animals. Unlike compounds normally considered as vitamins, choline does not serve as a cofactor in enzymatic reactions.
(12 Dec 1998) |
choline dihydrogen citrate |
<chemical> A lipotropic agent.
Chemical name: (2-hydroxyethyl)trimethylammonium citrate.
(17 Jul 2002) |
choline esterase I |
<enzyme, neurology, physiology> An enzyme that breaks down unused acetylcholine in the synaptic cleft (the space between neurons), this enzyme is necessary to restore the synaptic cleft so it is ready to transmit the next nerve impulse.
(06 May 1997) |
choline esterase II |
<enzyme> An enzyme that breaks down acetylcholine tostop its action.
(22 May 1997) |
choline kinase |
<enzyme> An enzyme that is active in the first step of choline phosphoglyceride (lecithin) biosynthesis by catalyzing the phosphorylation of choline to phosphorylcholine in the presence of ATP. Ethanolamine and its methyl and ethyl derivatives can also act as acceptors.
Chemical name: ATP:choline phosphotransferase
Registry number: EC 2.7.1.32
(12 Dec 1998) |
choline monooxygenase |
<enzyme> Catalyses conversion of choline to the hydrate form of betaine aldehyde.
Registry number: EC 1.-
Synonym: cmo enzyme
(26 Jun 1999) |
choline phosphatase |
<enzyme> An enzyme found mostly in plant tissue. It hydrolyzes glycerophosphatidates with the formation of a phosphatidic acid and a nitrogenous base such as choline. This enzyme also catalyses transphosphatidylation reactions.
Chemical name: Phosphatidylcholine phosphatidohydrolase
Registry number: EC 3.1.4.4
(12 Dec 1998) |
choline-phosphate cytidylyltransferase |
<enzyme> An enzyme that catalyses the transfer of cytidylate (CMP) to choline phosphate to form CDPcholine. It is the rate-limiting enzyme in the choline pathway for the biosynthesis of phosphatidylcholine. Its activity is increased by glucocorticoids.
Registry number: EC 2.7.7.15
(12 Dec 1998) |