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- The CDP-choline pathway, first identified by Eugene P. Kennedy in 1956, is the predominant mechanism by which mammalian cells synthesize phosphatidylcholine (PC) for incorporation into membranes or lipid-derived signalling molecules. The CDP-choline pathway represents one half of what is known as the Kennedy pathway. The other half is the CDP-ethanolamine pathway which is responsible for the biosynthesis of the phospholipid phosphatidylethanolamine (PE). The CDP-choline pathway begins with the uptake of exogenous choline into the cell. The first enzymatic reaction is catalyzed by choline kinase (CK) and involves the phosphorylation of choline to form phosphocholine. Phosphocholine is then activated by the addition of CTP catalyzed by the rate-limiting enzyme, CTP:phosphocholine cytidylyltransferase to form CDP-choline. The final step of the pathway involves the addition of the choline headgroup onto a diacylglycerol (DAG) backbone to form PC, catalyzed by choline/ethanolamine phosphotransferase (CEPT). Phosphatidylcholine can be acted upon by phospholipases to form different metabolites. (en)
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- The CDP-choline pathway, first identified by Eugene P. Kennedy in 1956, is the predominant mechanism by which mammalian cells synthesize phosphatidylcholine (PC) for incorporation into membranes or lipid-derived signalling molecules. The CDP-choline pathway represents one half of what is known as the Kennedy pathway. The other half is the CDP-ethanolamine pathway which is responsible for the biosynthesis of the phospholipid phosphatidylethanolamine (PE). Phosphatidylcholine can be acted upon by phospholipases to form different metabolites. (en)
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