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Mol Cell. 2010 May 28;38(4):590-602. doi: 10.1016/j.molcel.2010.02.040.

SWI/SNF has intrinsic nucleosome disassembly activity that is dependent on adjacent nucleosomes.

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  • 1Department of Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL 62901-4413, USA.

Abstract

The ATP-dependent chromatin remodeling complex SWI/SNF regulates transcription and has been implicated in promoter nucleosome eviction. Efficient nucleosome disassembly by SWI/SNF alone in biochemical assays, however, has not been directly observed. Employing a model system of dinucleosomes rather than mononucleosomes, we demonstrate that remodeling leads to ordered and efficient disassembly of one of the two nucleosomes. An H2A/H2B dimer is first rapidly displaced, and then, in a slower reaction, an entire histone octamer is lost. Nucleosome disassembly by SWI/SNF did not require additional factors such as chaperones or acceptors of histones. Observations in single molecules as well as bulk measurement suggest that a key intermediate in this process is one in which a nucleosome is moved toward the adjacent nucleosome. SWI/SNF recruited by the transcriptional activator Gal4-VP16 preferentially mobilizes the proximal nucleosome and destabilizes the adjacent nucleosome.

Copyright 2010 Elsevier Inc. All rights reserved.

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PMID:
20513433
[PubMed - indexed for MEDLINE]
PMCID:
PMC3161732
Free PMC Article
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