Abstract
Guanylhydrazones of p-nitrobenzaldehyde and methylglyoxal serve as acceptors of ADP-ribosyl groups for the reactions catalyzed by cholera toxin. The absorption spectrum of the ADP-ribosylated p-nitrobenzylidine aminoguanidine is similar to that of a 1:1 mixture of ADP-ribose and p-nitrobenzylidine aminoguanidine. Results from fast atom bombardment mass spectrometry prove that the product is mono-ADP-ribosylated. ADP-ribosylation lowers the p K a of the p-nitrobenzylidine aminoguanidine by 0.7–0.8 pH unit. Assay methods are developed for measuring the ADP-ribosyltransferase reaction by following the rate of disappearance of p-nitrobenzylidine aminoguanidine by high-performance liquid chromatography or spectrophotometrically by monitoring the absorbance increase at 370 nm accompanying ADP-ribosylation of p-nitrobenzylidine aminoguanidine. The high-performance liquid chromatographic system can be utilized to measure ADP-ribosyltransferase activity in animal tissues. By using this procedure, the presence and quantitation of an ADP-ribosyltransferase in a homogenate of rabbit skeletal muscle is reported.
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