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- W1506233361 abstract "The stimulation of poly(adenosine diphosphate ribose) [poly(ADP-ribose)] polymerase activity at the nuclear level after damage of HeLa cells by 1-methyl-1-nitrosourea has been previously reported. We have observed a similar activation of the enzyme after treatment of cells with MNU at the nucleosomal level of chromatin (greater than 1N). This stimulation of enzyme activity did not occur through an inhibition of the glycohydrolase enzyme which cleaves poly(ADP-ribose), or elongation of poly(ADP-ribose) chains, or an increased biosynthesis of enzyme protein. The increased activity appears to be a consequence of the generation of more acceptor sites on nuclear proteins for initiation of poly(ADP-ribose) synthesis. The data indicate that MNU increased the accessibility of nucleosome core histones for modification by poly(ADP) ribosylation." @default.
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- W1506233361 date "1979-04-01" @default.
- W1506233361 modified "2023-09-23" @default.
- W1506233361 title "Effect of 1-methyl-1-nitrosourea on poly(adenosine diphosphate-ribose) polymerase activity at the nucleosomal level." @default.
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