Isolation and characterization of the DNA fraction of rat liver chromatin which binds polylysine.

Abstract:

:The structure of eukaryotic chromatin has been investigated by isolating and analyzing the "accessible" DNA fraction of rat liver chromatin. This DNA fraction has been isolated by titrating the chromatin with the protese-resistant D isomer of polylysine to bind the "accessible" DNA sites. After removal of chromosomal proteins by digestion with pronase, all DNA not protected from attack by bound polylysine was removed by digestion with DNase. Even after exhaustive treatment with pronase and DNase approximately 30% of the chromatin DNA remains resistant to nuclease attack. Analysis of the isolated DNA shows it to be mainly double-stranded with an average size of 200-250 base pairs. The DNA is slightly A-T rich and contains both repetitive and "single-copy" nuleotide sequences. The results suggest that there are extensive regions in chromatin where the DNA is not tightly complexed with protein. Furthermore, the DNA of these regions is similar in gross properties to the DNA of the total genome.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Arnold EA,Wahn U,Young KE

doi

10.1093/nar/2.5.667

keywords:

subject

Has Abstract

pub_date

1975-05-01 00:00:00

pages

667-81

issue

5

eissn

0305-1048

issn

1362-4962

journal_volume

2

pub_type

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