CDP-choline is an intermediate the predominant mechanism of biosynthesis of phosphatidylcholine (Figure 19.5).
1. Phosphocholine + CTP <=> CDP-choline + PPi, (catalyzed by CTP:phosphocholine cytidyl transferase)
2. CDP--choline + Diacylglycerol <=> CMP + Phosphatidylcholine (catalyzed by CDP-choline: 1,2-Diacylglycerol Phosphocholine Transferase)