Histone H2A, H2B, and H1--specific proteinases tightly associated with histones were shown to be present in rat thymus nuclei. The activity of proteinases tightly associated with histones increases after exposure of animals to gamma-rays. The denatured DNA activated the histone H1-specific proteinase. These proteinase dissociated from histones in the presence of dithiothreitol. The histones and proteinases were divided into fractions by chromatography on DEAE-cellulose in the presence of 5 mM dithiothreitol.
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