Nucleoside-Diphosphate Kinase. Deoxynucleoside Diphosphate Kinases . GDP Kinase . Nucleoside Diphosphokinases . Nucleoside-Diphosphate Kinases . Diphosphate Kinases, Deoxynucleoside . Diphosphokinases, Nucleoside . Kinase, GDP . Kinase, Nucleoside-Diphosphate . Kinases, Deoxynucleoside Diphosphate . Kinases, Nucleoside-Diphosphate . Nucleoside Diphosphate Kinase . Nucleoside Diphosphate Kinases . An enzyme that is found in mitochondria and in the soluble cytoplasm of cells. It catalyzes reversible reactions of a nucleoside triphosphate, e.g., ATP, with a nucleoside diphosphate, e.g., UDP, to form ADP and UTP. Many nucleoside diphosphates can act as acceptor, while many ribo- and deoxyribonucleoside triphosphates can act as donor. EC 2.7.4.6. . 0.71