title: Poly(ADP-ribose) polymerase activity in mouse cells which exhibit temperature-sensitive DNA synthesis.
abstract: The poly(ADP-ribose) polymerase activity of wild-type mouse L cells and of Balb/C-3T3 mouse fibroblasts remained relatively unchanged (at approx. 400 nmol substrate utilized/mg DNA per h) in actively-growing cells incubated at 34 degrees C or at 38.5 degrees C for at least 72 h. A similar result was obtained with the following temperature-sensitive cells grown at the permissive temperature (34 degrees C): ts A1S9 mouse L cells, ts C1 mouse L cells and Balb/C-3T3 ts mouse fibroblasts. The poly(ADP-ribose) polymerase activity of the temperature-sensitive cells was little affected during incubation for 20-24 h at the non-permissive temperature of 38.5 degrees C under which conditions temperature-inactivation of DNA replication was complete. Thereafter, this enzyme activity was found to increase some 2-fold, at a time when normal semi-conservative DNA synthesis was totally suppressed and replaced by repair replication (Sheinin, R. and Guttman, S. (1977) Biochim. Biophys. Acta 479, 105-118; Sheinin, R., Dardick, I. and Doane, F.W. (1980) Exp. Cell. Res., in the press).
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis; D004261:DNA Replication; D007700:Kinetics; D007739:L Cells / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D009244:NAD+ Nucleosidase / Q000378:metabolism*; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism*; D013696:Temperature
chemical_list: D004247:DNA; D011065:Poly(ADP-ribose) Polymerases; D009244:NAD+ Nucleosidase