Apr 20, 1976

Induction of stable protein-deoxyribonucleic acid adducts in Chinese hamster cell chromatin by ultraviolet light

G F Strniste, S C Rall


Ultraviolet (uv)-light-mediated formation of protein-DNA adducts in Chinese hamster cell chromatin was investigated in an attempt to compare chromatin alterations induced in vitro with those observed in vivo. Three independent methods of analysis indicated stable protein-DNA associations: (1) a membrane filter assay which retained DNA on the filter in the presence of high salt-detergent; (2) a Sepharose 4B column assay in which protein eluted cincident with DNA; and (3) a CsCl density gradient equilibrium assay which showed both protein and DNA banding at densities other than their respective native densities. Treatment of the irradiated chromatin with DNase provided further evidence that protein-DNA and not protein-protein adducts were being observed in the column assay. There is a fluence-dependent response of protein-DNA adduct formation when the chromatin is irradiated at low ionic strength and is linear for protein over the range studied. When the chromatin is exposed to differing conditions of pH, ionic strength, or divalent metal ion concentration, the quantity of adduct formed upon uv irradiation varies. Susceptibility to adduct formation can be partially explained in terms of the condensation state of the chromatin and...Continue Reading

Mentioned in this Paper

Macromolecular Compounds
Centrifugation, Density Gradient
Chinese Hamster
DNA Adduction
Deoxyribonuclease I
Gene Products, Protein
Effects of Radiation

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