Inorganic pyrophosphatase (PPiase) activity was measured in cell fractions of rat, mouse, and human erythrocytes; normal rat liver; Novikoff hepatoma; Morris 3924A hepatoma; and mouse Ehrlich and Sarcoma 37 ascites tumors. Despite high intracellular activities, when precautions were taken to
The Harvey sarcoma virus-transformed derivative of normal rat kidney cells contains a very large membrane-associated NAD+ pyrophosphatase activity. Exogenous NAD+ was metabolized into NMN, demonstrating that the enzyme was located, at least in part, on the external surface of the cell. This external
DNA polymerase from RNA tumor viruses ("reverse transcriptase") has been analyzed for activities which have been associated with other DNA polymerases. Homogeneous DNA polymerase from avian myeoblastosis virus catalyzes pyrophosphate exchange and pyrophosphorolysis. Pyrophosphate exchange is
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