Effect of irradiation and endogenous nucleases on rat liver chromatin.

Abstract:

:These assessment of the consequences of irradiation on chromatin is complicated by endogenous nucleases. Isolation and prolonged storage of rat liver nuclei in buffers containing divalent metal ions activates these enzymes and promotes the degradation of chromatin. Irradiation of rat liver nuclei to dose levels of 20,000 rad under conditions in which endogenous nucleases are inhibited and analysis of the irradiated chromatin by sucrose density gradient centrifugation gave no evidence for monosomes or oligosomes. When chromatin from irradiated nuclei was digested with micrococcal nuclease, the levels of monosomes and oligosomes were identical to those of micrococcal nuclease, the levels of monosomes and oligosomes are identical to suggest that irradiation results in neither a direct fragmentation of linkers nor the sensitization of linkers for subsequent cleavage by micrococcal nuclease. Histones isolated from monosomes of irradiated and unirradiated nuclei were intact, showing no fragmentation or loss of residues, as judged by sodium dodecyl sulfate-polyacrylamide electrophoresis.

journal_name

Radiat Res

journal_title

Radiation research

authors

Gelderblom D,Smit BJ,Böhm L

subject

Has Abstract

pub_date

1984-08-01 00:00:00

pages

363-71

issue

2

eissn

0033-7587

issn

1938-5404

journal_volume

99

pub_type

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