Cytidylate kinase EC:2.7.4.14 catalyses the phosphorylation of cytidine 5'-monophosphate (dCMP) to cytidine 5'-diphosphate (dCDP) in the presence of ATP or GTP.

1: Structures of escherichia coli CMP kinase alone and in complex with CDP: a new fold of the nucleoside monophosphate binding domain and insights into cytosine nucleotide specificity. Briozzo P, Golinelli-Pimpaneau B, Gilles AM, Gaucher JF, Burlacu-Miron S, Sakamoto H, Janin J, Barzu O; Structure 1998;6:1517-1527. PMID:9862805