Abstract
We have developed a novel enzyme assay that allows the simultaneous determination of noncovalent interactions of poly(ADP-ribose) with nuclear proteins as well as poly(ADP-ribose) glycohydrolase (PARG) activity by high resolution polyacrylamide gel electrophoresis. ADP-ribose chains between 2 and 70 residues in size were enzymatically synthesized with pure poly(ADP-ribose) polymerase (PARP) and were purified by affinity chromatography on a boronate resin following alkaline release from protein. This preparation of polymers of ADP-ribose was used as the enzyme substrate for purified PARG. We also obtained the nuclear matrix fraction from rat liver nuclei and measured the enzyme activity of purified PARG in the presence or absence of either histone proteins or nuclear matrix proteins. Both resulted in a marked inhibition of PARG activity as determined by the decrease in the formation of monomeric ADP-ribose. The inhibition of PARG was presumably due to the non-covalent interactions of these proteins with free ADP-ribose polymers. Thus, the presence of histone and nuclear matrix proteins should be taken into consideration when measuring PARG activity.
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Pacheco-Rodriguez, G., Alvarez-Gonzalez, R. Measurement of poly(ADP-ribose) glycohydrolase activity by high resolution polyacrylamide gel electrophoresis: Specific inhibition by histones and nuclear matrix proteins. Mol Cell Biochem 193, 13–18 (1999). https://doi.org/10.1023/A:1006927119100
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DOI: https://doi.org/10.1023/A:1006927119100