Role of (ADP-ribose)n catabolism in DNA repair.

H Maruta, N Matsumura, S Tanuma

Index: Biochem. Biophys. Res. Commun. 236(2) , 265-9, (1997)

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Abstract

Poly(ADP-ribose) is a reversible covalent-modifier of chromosomal proteins in eukaryotic cells. The function of poly(ADP-ribose) is not clear, although it has been suggested to be involved in the regulation of DNA transactions such as replication, repair, and transcription. Here we describe a specific competitive inhibitor of poly(ADP-ribose) glycohydrolase, a macrocircular ellagitannin oenothein B, and a nuclear system prepared from synchronized HeLa S3 cells at mid-G1 phase that enable us to examine the role of poly(ADP-ribose) catabolism in DNA repair. The results suggest that poly(ADP-ribose) is capable of generating ATP by the concerted action of poly(ADP-ribose) glycohydrolase and ADP-ribose pyrophosphorylase and that this ATP enables repair DNA synthesis.