
Additional file 1. Assay of enzyme activities of crude PpnK. Samples were taken at 24 h of the shake flask using LBG culture. NAD kinase encoding by ppnK in C. crenatum contained ATP-NAD+ kinase, ATP-NADH kinase, PolyP-NAD+ kinase and PolyP-NADH kinase. Each data represented the average value of three independent measurements.
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