Ethanolamine-phosphate cytidylyltransferase which catalyzes the second step of phosphatidylethanolamine biosynthesis. Involved in the maintenance of plasma membrane and required for proper sporulation. CTP + H(+) + phosphoethanolamine = CDP-ethanolamine + diphosphate Phospholipid metabolism; phosphatidylethanolamine biosynthesis; phosphatidylethanolamine from ethanolamine: step 2/3. By isooctane. Present with 4700 molecules/cell in log phase SD medium. Belongs to the cytidylyltransferase family.