ADP‐Ribosylation in Permeable HeLa S3 Cells
- 1 January 1983
- journal article
- research article
- Published by Wiley in European Journal of Biochemistry
- Vol. 130 (1), 47-51
- https://doi.org/10.1111/j.1432-1033.1983.tb07115.x
Abstract
ADP-ribosylation in permeabilized metaphase and interphase [human cervical carcinoma HeLa-S3] cells using [32P]NAD at pH 8.0 were compared. Incorporation into trichloroacetic acid insoluble material was 4-5 times greater in metaphase cells, 17-22% was in the soluble fraction which contained material released from the cells, 16-22% in the 0.2 M HCl extract (histones) of the cell ghosts and the remaining activity in the residual fraction. Fractions were analyzed using dodecyl sulfate/polyacrylamide gel electrophoresis at pH 6.0. The soluble fractions from metaphase and interphase cells exhibited 3 common unidentified ADP-ribosylated proteins corresponding to 78,000, 54,000 and 36,000 Da [daltons]. In addition metaphase cells contained several other ADP-ribosylated proteins not present in interphase cells. The 0.2 M HCL extracts gave from metaphase cells radioactivity in the 32,000-39,000-Da region suggesting ADP-ribosylation of histone H1 with up to 10 residues of ADP-ribose and in the 17,000-20,000-Da region indicating ADP-ribosylation of core histones. The pattern of ADP-ribosylation of core histone in metaphase and interphase cells was qualitatively similar whereas the number of ADP-ribose residues per H1 molecule was higher in metaphase cells. The residual fraction contained free poly(ADP-ribose) and oligo(ADP-ribose). The results do not lend support to a special function of ADP-ribosylated histones in the mitotic event while certain ADP-ribosylated non-histone proteins may be specific for metaphase cells.This publication has 31 references indexed in Scilit:
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