Nucleic Acids Research, 1985, Vol. 13, No. 6 1977-1995
© 1985
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N-Butyrate incubation of immature chicken erythrocytes preferentially enhances the solubility of ß^ chromatin
Department of Biochemical and Biophysical Sciences, University of Houston University Park, Houston, TX 77004, USA
Received November 28, 1984. Revised February 15, 1985. Accepted February 15, 1985.
The solubility of adult ß-globin chromatin (ßA chromatin) from immature chicken red blood cells can be controlled by the presence or absence of n-butyrate in a cell incuoation madium. In the absence of n-butyrate, only a small percentage (
4%) of the total ßA chromatin is in a soluble chromatin fraction following micrococcal nuclease digestion and centrifugation. This percentage increases to approxirmately 4045% of the ßA chromatin if cells are incubated 1 hour in the presence of 10 mM sodium n-butyrate. The highest yield and enricnhent of solubilized ßA chromatin is attained when 14% of the DNA is rendered acid soluble, and in buffers containing 1.5 5 mM MgCl2 The soluble ßA nucleohistone is nucleosome oligomer size (contains DNA 250600 bases in length) and can be separated from soluble, transcriptionally inert mononucleosomes by agarose A-5m exclusion chromatography.
The enhanced solubility appears to be specific for transcriptionally active chromatin. Whereas 4045% of the ßA chrormatin is recovered in the supernatant fraction from n-butyrate incubated immature erythrocytes, nucleohistone containing ovalbumin DNA sequences remains insoluble.
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