Characteristics of the DNA polymerase beta-directed unscheduled DNA synthesis in isolated nuclei from adult rat liver.

Zoncheddu A, Accomando R
Int J Biochem (1984), Volume 16, Page 391
PubMed entry


Isolated nuclei from adult rat liver have been used as a model system ...
Isolated nuclei from adult rat liver have been used as a model system to define several characteristics of the unscheduled DNA synthesis supported by DNA polymerase beta. Many of these characteristics have been found to reflect some catalytic properties (pH optimum, divalent cations requirement, dependence on all four deoxyribonucleoside triphosphates, apparent Km for dTTP) as well as sensitivity to various agents (differential inhibitors of eukaryotic DNA polymerases, phosphate, DNA intercalating drugs, chemical or thermal denaturation) commonly regarded as typical of DNA polymerase beta itself. Given the new picture of the enzymology of DNA repair synthesis which has recently emerged, none of the above characteristics seem to be suitable candidates as diagnostic tools of a repair polymerization process.




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