The SWI/SNF complex creates loop domains in DNA and polynucleosome arrays and can disrupt DNA-histone contacts within these domains.

Abstract:

:To understand the mechanisms by which the chromatin-remodeling SWI/SNF complex interacts with DNA and alters nucleosome organization, we have imaged the SWI/SNF complex with both naked DNA and nucleosomal arrays by using energy-filtered microscopy. By making ATP-independent contacts with DNA at multiple sites on its surface, SWI/SNF creates loops, bringing otherwise-distant sites into close proximity. In the presence of ATP, SWI/SNF action leads to the disruption of nucleosomes within domains that appear to be topologically constrained by the complex. The data indicate that the action of one SWI/SNF complex on an array of nucleosomes can lead to the formation of a region where multiple nucleosomes are disrupted. Importantly, nucleosome disruption by SWI/SNF results in a loss of DNA content from the nucleosomes. This indicates a mechanism by which SWI/SNF unwraps part of the nucleosomal DNA.

journal_name

Mol Cell Biol

authors

Bazett-Jones DP,Côté J,Landel CC,Peterson CL,Workman JL

doi

10.1128/mcb.19.2.1470

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

1470-8

issue

2

eissn

0270-7306

issn

1098-5549

journal_volume

19

pub_type

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