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Molecular and Cellular Biology, November 2002, p. 7484-7490, Vol. 22, No. 21
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.21.7484-7490.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

hSWI/SNF-Catalyzed Nucleosome Sliding Does Not Occur Solely via a Twist-Diffusion Mechanism

Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, New York 14642

Received 21 June 2002/ Accepted 6 August 2002

Nucleosome remodeling by the hSWI/SNF complex and other chromatin remodeling complexes can cause translocation (sliding) of the histone octamer in cis along DNA. Structural and biochemical evidence suggest that sliding involves a DNA twist-diffusion process whereby the DNA rotates about the helical axis without major displacement from the surface of the nucleosome and that this process may be driven by torsional stress within the DNA. We report that hSWI/SNF efficiently catalyzes sliding of nucleosomes containing branched DNAs as steric blocks to twist-diffusion and a nick to allow dissipation of torsional stress within the nucleosome. These results suggest that SWI/SNF-catalyzed nucleosome sliding does not occur exclusively via a simple twist-diffusion mechanism and support models in which the DNA maintains its rotational orientation to and is at least partially separated from the histone surface during nucleosome translocation.

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