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A rapid in vitro enzymatic biosynthesis system has been developed as a biological manufacturing platform with potential industrial uses. Cytidine 5'-monophosphate (5'-CMP) is a key intermediate in the preparation of several nucleotide derivatives and is widely used in food and pharmaceutical industries. In this study, a highly efficient biosynthesis system was constructed for manufacturing 5'-CMP in vitro. Cytidine kinase (CK) was used for the biotransformation of cytidine to 5'-CMP, while polyphosphate kinase (PPK) was coupled for adenos