2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase activity
2-c-methyl-d-erythritol 4-phosphate cytidylyltransferase activity
Catalysis of the reaction: 2-C-methyl-D-erythritol 4-phosphate + CTP = 4-CDP-2-C-methyl-D-erythritol + diphosphate.