Catalyzes the final step in the CDP-choline route leading to phosphatidylcholin (PC). Preferentially uses CDP-monomethylethanolamine as aminoalcohol substrate. Shows highest activity toward di- and mono-unsaturated diacylglycerol species as lipid substrates. The CDP-choline pathway only contributes to net PC synthesis if exogenous choline is present. In its absence, this pathway recycles choline from PC turnover and may contribute to maintaining the proper PC species composition. a 1,2-diacyl-sn-glycerol + CDP-choline = a 1,2-diacyl-sn-glycero-3-phosphocholine + CMP + H(+) a 1,2-diacyl-sn-glycerol + CDP-N,N-dimethylethanolamine = 1,2-diacyl-sn-glycero-3-phospho-N,N-dimethylethanolamine + CMP + H(+) Requires a divalent cation activator, and is inhibited by CMP. Activated by phospholipids, especially phosphatidylcholine. Phospholipid metabolism; phosphatidylcholine biosynthesis; phosphatidylcholine from phosphocholine: step 2/2. Repressed by inositol. Present with 981 molecules/cell in log phase SD medium. Belongs to the CDP-alcohol phosphatidyltransferase class-I family. Extended N-terminus. Extended N-terminus.