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• W1993431290 abstract "Chromatin in isolated rat liver nuclei was compared with chromatin in (i) nuclei depleted of H1 by acid extraction; (ii) nuclei treated at pH 3.2 (without removal of H1), and (iii) depleted nuclei following reassociation of H1. Electron microscopy and digestion by DNase I, micrococcal nuclease and endogenous Ca/Mg endonuclease were used for this comparative examination. Electron micrographs of H1-depleted nuclei showed a dispersed and finely granular appearance. The rate of DNA cleavage by micrococcal nuclease or DNase I was increased several-fold after H1 removal. Discretely sized intermediate particles produced by Ca/Mg endonuclease in native nuclei were not observed in digests of depleted nuclei. Digestion by micrococcal nuclease to chromatin particles soluble in 60 mM NaCl buffer appeared not to be affected in depleted nuclei. When nuclei were treated at pH 3.2, neither the appearance of chromatin in electron micrographs nor the mode or rate of nuclease digestion changed appreciably. Following reassociation of H1 to depleted nuclei, electron micrographs demonstrated the reformation of compacted chromatin, but the lower rate of DNA cleavage in native nuclei was not restored. Further, H1 reassociation produced a significant decrease in the solubility of nuclear chromatin cleaved by micrococcal nuclease or Ca/Mg endonuclease. In order to evaluate critically the reconstitution of native chromatin from H1-depleted chromatin we propose the use of digestion by a variety of nucleases in addition to an electron microscopic examination." @default.
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• W1993431290 date "1981-04-01" @default.
• W1993431290 modified "2023-09-23" @default.
• W1993431290 title "Structure of rat liver nuclei after depletion and reassociation of histone H1" @default.
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• W1993431290 doi "https://doi.org/10.1016/0014-4827(81)90115-4" @default.
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