Abstract
A poly(ADP-ribose)-H1 histone complex has been isolated from HeLa cell nuclei incubated with NAD. The rate of poly(ADP-ribose) glycohydrolase catalyzed hydrolysis of the polymer in the complex is only 1/9 that of free poly(ADP-ribose), indicating that the polymer is in a protected environment within the complex. Comparison of the rate of hydrolysis of free poly(ADP-ribose) in the presence or absence of H1 to that in the complex synthesized de novo indicates a specific mode of packaging of the complex. This is further indicated by the fact that alkaline dissociation of the complex followed by neutralization markedly exposes the associated poly(ADP-ribose) to the glycohydrolase. The complex also partially unfolds when it binds to DNA as evidenced by a 2-fold increase in the rate of glycolytic cleavage of poly(ADP-ribose). This effect of DNA is not due to a stimulation of the glycohydrolase per se since hydrolysis of free polymer by the enzyme is strongly inhibited by DNA, especially single-stranded DNA. Inhibition of glycohydrolase by DNA results from the binding of the enzyme to DNA and conditions which decrease this binding (increased ionic strength or addition of histone H1 which competes for DNA binding) relieve the DNA inhibition.
MeSH Terms
Cell Nucleus/enzymology
Chromatin/metabolism
DNA/metabolism
DNA, Single-Stranded/metabolism
Glycoside Hydrolases/antagonists & inhibitors,metabolism
HeLa Cells
Histones/metabolism
Nucleoside Diphosphate Sugars/metabolism
Osmolar Concentration
Poly Adenosine Diphosphate Ribose/metabolism
Structure-Activity Relationship
Chemicals
Chromatin
DNA, Single-Stranded
Histones
Nucleoside Diphosphate Sugars
Poly Adenosine Diphosphate Ribose
DNA
Glycoside Hydrolases
poly ADP-ribose glycohydrolase
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Stone P R
Lorimer W S
Ranchalis J
Danley M
Kidwell W R
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