Partitioning of zinc and copper within subnuclear nucleoprotein particles.

Abstract:

:Nuclei from frozen calf thymus suspended in buffer were analyzed for metal content prior to and after repeated washing. After three such extractions about 0.1 micrograms Zn/mg DNA and 0.025 micrograms Cu/mg DNA remained tightly associated with chromatin. This level of metal was essentially unchanged with subsequent washings. Digestion of extracted nuclei with micrococcal nuclease yielded soluble nucleoprotein containing zinc and copper. Metal enriched regions of chromatin appeared to be preferentially solubilized by digestion, and the solubilized metal was only partially dializable either with or without EDTA. Metal profiles generated from gel (A-5m) chromatography analysis of chelated and non-chelated solubilized chromatin were distinctive in that copper was undetectable (by flame AA) while zinc was associated only with low molecular weight products when EDTA was used. In contrast, both metals were detected with higher molecular weight oligonucleosomes in the absence of chelating agents. Additionally, the two metals localized within nucleoprotein peaks and these metal-containing regions were only resolved by gel chromatography when EDTA was omitted throughout the procedure. A discrete Cu-rich species in a region of the profile suggests a subset of Cu-rich nucleoprotein complexes.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Bryan SE,Vizard DL,Beary DA,LaBiche RA,Hardy KJ

doi

10.1093/nar/9.21.5811

subject

Has Abstract

pub_date

1981-11-11 00:00:00

pages

5811-23

issue

21

eissn

0305-1048

issn

1362-4962

journal_volume

9

pub_type

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