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Two rat liver ADP-ribose pyrophosphatases (ADPRibases) were partially purified. ADPRibase-I hydrolyzed ADP-ribose (K m =0.5 μM) giving AMP as a product, required Mg 2+ or, less efficiently, Mn 2+ (Ca 2+ was not active), its activity changed little between pH 7 and 9, and was specific for ADP-ribose as it did not hydrolyze ADP-glucose, NAD + ,...
Each of a range of pharmacological agents which function to increase intracellular levels of cAMP caused a morphological 'differentiation' of neuroblastoma x glioma hybrid, NG108-15, cells grown in tissue culture. Associated with this differentiation, increased incorporation of [ 32 P]ADP-ribose catalysed by pertussis toxin was noted into a band of some 39-40 kDa in membranes derived...
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