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Association of actin with DNA and nuclear matrix from Guerin ascites tumour cells

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The protein composition of nuclear matrices containing different amount of DNA was examined. It was found that, in matrices containing 2% to 80% of total DNA, the quantity of DNA-bound proteins remains relatively constant varying from 10% to 15% of total nuclear proteins. Electrophoretic patterns do not differ substantially, but autoradiograms with in vitro 125I labelled proteins show quantitative variations in the actin content. Application of radioimmunoassay (RIA) enabled to determine the exact content of actin in GAT nuclei and nuclear matrices – 5 μg/ml in nuclei, of which 50% are bound to DNA and 3001o being a component of the protein part of the nuclear matrix. These results are supported by electron microscopic data, where immunogold technique was performed on thin sections and spread material. The applied methods suggest that part of the nuclear actin is tightly bound (resistant to 2 M NaCI) to DNA and represents a component of the internal nuclear matrix.

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Correspondence to Chavdar P. Krachmarov.

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Valkov, N.I., Ivanova, M.I., Uscheva, A.A. et al. Association of actin with DNA and nuclear matrix from Guerin ascites tumour cells. Mol Cell Biochem 87, 47–56 (1989). https://doi.org/10.1007/BF00421082

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Key words

  • nuclear actin
  • nuclear matrix
  • immunoelectron microscopy