Catalyzes the committed step in the synthesis of phosphatidylcholine by the CDP-choline pathway (PubMed:2536698, PubMed:9506987, PubMed:10329685). Also exhibits ethanolamine kinase activity but it is a poor substrate at 14% efficiency compared with choline (PubMed:2536698, PubMed:9506987). ATP + choline = ADP + H(+) + phosphocholine ATP + ethanolamine = ADP + H(+) + phosphoethanolamine Optimum pH is 9.5-12. Optimum temperature is 30 degrees Celsius. Phospholipid metabolism; phosphatidylcholine biosynthesis; phosphocholine from choline: step 1/1. Monomer. Interacts with NAP1. Present with 3930 molecules/cell in log phase SD medium. Belongs to the choline/ethanolamine kinase family.