Crossref journal-article
Wiley
European Journal of Biochemistry (311)
Abstract

1. The ability of isolated LS‐cell nuclei to incorporate [adenine‐3H]‐NAD into acid‐insoluble products is demonstrated.2. The incorporation has a pH optimum at 8.5 and an apparent temperature optimum at 25 °C.3. The optimum Mg2+ concentration is dependent upon the NAD concentration; at 1.5 μM NAD it is 2 mM; at 1.5 mM NAD it is 3 mM; and at 9 mM NAD it is above 20 mM Mg2+ Mg2+ can be replaced by Ca2+.4. Dithiothreitol or mercaptoethanol, up to 10 mM, enhances the incorporation of NAD.5. With the optimal conditions the incorporation of NAD (V) is 128 nmol NAD×5 min−1×mg DNA−1 and the Km is 1.47 ± 0.18 mM. Nicotinamide inhibits the incorporation competitively with a Ki of 14.3 ± 1 μM and thymidine inhibits competitively with a Ki of 32.5 μM.6. The incorporation is not affected by added DNA or poly(U). It is not affected by ribonuclease but is inhibited by about 50% on treatment with deoxyribonuclease.7. The enzyme system is unstable and the decay is temperature‐dependent; there is little decay at 0 °C but above this temperature the rate of decay follows an Arrhenius relationship. The initial rates of enzyme activity also show a temperature dependence with a linear Arrhenius plot. The temperature optimum at 25 °C is the arithmetic result of these two opposing processes.

Bibliography

Stone, P. R., & Shall, S. (1973). Poly(Adenosine Diphosphoribose) Polymerase in Mammalian Nuclei. European Journal of Biochemistry, 38(1), 146–152. Portico.

Authors 2
  1. Peter R. Stone (first)
  2. Sydney Shall (additional)
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Dates
Type When
Created 20 years, 5 months ago (March 4, 2005, 6:43 a.m.)
Deposited 1 year, 9 months ago (Nov. 23, 2023, 10:55 a.m.)
Indexed 1 year, 9 months ago (Nov. 23, 2023, 11:10 a.m.)
Issued 52 years ago (Sept. 1, 1973)
Published 52 years ago (Sept. 1, 1973)
Published Online 20 years, 5 months ago (March 3, 2005)
Published Print 52 years ago (Sept. 1, 1973)
Funders 0

None

@article{Stone_1973, title={Poly(Adenosine Diphosphoribose) Polymerase in Mammalian Nuclei: Characterization of the Activity in Mouse Fibroblasts (LS Cells)}, volume={38}, ISSN={1432-1033}, url={http://dx.doi.org/10.1111/j.1432-1033.1973.tb03044.x}, DOI={10.1111/j.1432-1033.1973.tb03044.x}, number={1}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={Stone, Peter R. and Shall, Sydney}, year={1973}, month=sep, pages={146–152} }