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. 1979 Sep 11;7(1):31–48. doi: 10.1093/nar/7.1.31

The non-histone proteins of the rat liver nucleus and their distribution amongst chromatin fractions as produced by nuclease digestion.

J E Hyde, T Igo-Kemenes, H G Zachau
PMCID: PMC327994  PMID: 493143

Abstract

The search for proteins involved in maintaining higher order chromatin structures has led to a systematic examination of the non-histone proteins (NHP) of rat liver nuclei in the context of nuclease digestion studies. 40-45% of the 3H-tryptophan labelled NHP originally present could be removed by extensive washing in a "physiological" buffer, incubation at 37 degrees C with or without nuclease and a further wash step. Nuclei at this stage had a remarkably constant NHP content (ca. 0.73 micrograms/micrograms DNA), independent of the degree of digestion with micrococcal nuclease or HaeIII. The solubilized chromatin produced by limited digestion with either nuclease contained 0.3-0.5 microgram NHP/microgram DNA, this value falling to ca. 0.16 after more extensive cleavage. Insoluble chromatin fractions were between 2-fold (very limited digestion) and 16-fold (extensive digestion) richer in NHP than the corresponding soluble fractions. Gel electrophoresis revealed about 12 NHP bands in soluble fractions, the most prominent of M.Wt. 41.400, while the insoluble material had at least 50 components. These properties were independent of whether lysis of nuclei occurred in 0.2 or 50 mM ionic strength. The large disparity in NHP content between complementary soluble and insoluble chromatin fractions is considered in terms of chromatin organization in vivo and the possible role of NHP migration.

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Selected References

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