PMID: 590272Nov 15, 1977

Properties of the complex between histone H1 and poly(ADP-ribose synthesised in HeLa cell nuclei

European Journal of Biochemistry
P R StoneW R Kidwell


Preparations of H1 histone from HeLa cell nuclei incubated with [3H]NAD to permit poly(ADP-ribose) synthesis were electrophoresed on polyacrylamide gels. The incorporated radioactivity migrated as a sharply defined peak in association with a protein band which moved more slowly than H1, the major protein component. The following observations indicate that this complex is composed of two molecules of H1 and a single chain of poly(ADP-ribose) with one detectable covalent linkage of polymer to protein. 1. The [14C]arginine/[3H]lysine ratio is identical in H1 histone and in the protein moiety of the complex. 2. Protein is displaced from H1 histone to the complex during poly(ADP-ribose) synthesis. At least 90% of the protein in the complex (stainable protein and labelled protein) is derived from H1. 3. Sedimentation rate studies indicate a molecular weight of the complex about twice that of H1 histone. 4. The average chain length of the polymer is 15 ADP-ribose units and there are 7--8 ADP-ribose units for each molecule of H1 histone in the 'complex'. 5. Poly(ADP-ribose) glycohydrolase, which hydrolyses the polymer exoglycosidically from the AMP terminus, degrades the complex producing ADP-ribose and mono-ADP-ribosylated H1 histone ...Continue Reading


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Cell Nucleus
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