Segregation of Rapidly Acetylated Histones into a Chromatin Fraction Released from Intact Nuclei by the Action of Micrococcal Nuclease

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1980 Apr 25

PMID 7433128

Citations 25

Authors

D Nelson

J Covault

R Chalkley

Affiliations

Soon will be listed here.

Abstract

It has been previously shown that micrococcal nuclease digestion and subsequent fractionation of hen oviduct nuclei generates fractions enriched (first supernatant fraction - 1SF) and depleted (second supernatant fraction - 2SF) in ovalbumin genes, while a third fraction, the pellet fraction, contains about the same level of this gene as whole chromatin (Bloom and Anderson (1978) Cell 15, 141-150). We have utilized this fractionation method in an attempt to assess the extent and kinetics of histone acetylation associated with chromatin from the 1SF, 2SF, and pellet fraction. Hepatoma Tissue Culture (HTC) cells were labelled for 30 minutes in vivo with 3H-acetate, nuclei isolated and the chromatin fractionated. The specific activity of the histones in the 1SF was slightly greater than that of the 2SF (1.2 to 1.6 fold difference) independent of the length of nuclease digestion. If the labelling period is followed by short (10 to 60 minute) treatment of the cells with sodium butyrate, the more rapidly as well as more extensively acetylated histones are also preferentially found in the 1SF. This is in part the result of segregation of chromatin particles into the 1SF as the histones associated with these particles become hyperacetylated. That is, the extent of histone acetylation regulates the distribution of chromatin in the 1SF, 2SF and pellet fraction.

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