title: Poly(etheno ADP-ribose) blocks poly(ADP-ribose) glycohydrolase activity.
abstract: Poly(ADP-ribose) is a biopolymer synthesized by poly(ADP-ribose) polymerases. Recent findings suggest the possibility for modulation of cellular functions including cell death and mitosis by poly(ADP-ribose). Derivatization of poly(ADP-ribose) may be useful for investigating the effects of poly(ADP-ribose) on various cellular processes. We prepared poly(etheno ADP-ribose) (poly(epsilonADP-ribose)) by converting the adenine moiety of poly(ADP-ribose) to 1-N(6)-etheno adenine residues. Poly(epsilonADP-ribose) is shown to be highly resistant to digestion by poly(ADP-ribose) glycohydrolase (Parg). On the other hand, poly(epsilonADP-ribose) could be readily digested by phosphodiesterase. Furthermore, poly(epsilonADP-ribose) inhibited Parg activity to hydrolyse ribose-ribose bonds of poly(ADP-ribose). This study suggests the possibility that poly(epsilonADP-ribose) might be a useful tool for studying the poly(ADP-ribose) dynamics and function of Parg. This study also implies that modification of the adenine moiety of poly(ADP-ribose) abrogates the susceptibility to digestion by Parg.
authors.affiliation: ADP-ribosylation in Oncology Project, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan. mmasutan@gan2.res.ncc.go.jp
authors.forename: Masayasu
authors.initials: M
authors.lastname: Shirato
authors.forename: Shunichi
authors.initials: S
authors.lastname: Tozawa
authors.forename: Daisuke
authors.initials: D
authors.lastname: Maeda
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Watanabe
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Nakagama
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Masutani
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006026:Glycoside Hydrolases / Q000037:antagonists & inhibitors*; D006367:HeLa Cells; D006801:Humans; D011064:Poly Adenosine Diphosphate Ribose / Q000031:analogs & derivatives* / Q000494:pharmacology; D011065:Poly(ADP-ribose) Polymerases / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004791:Enzyme Inhibitors; D011994:Recombinant Proteins; C518709:poly(etheno ADP-ribose); D011064:Poly Adenosine Diphosphate Ribose; D011065:Poly(ADP-ribose) Polymerases; D006026:Glycoside Hydrolases; C022407:poly ADP-ribose glycohydrolase