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XB-ART-2414
Proc Natl Acad Sci U S A 2005 Feb 01;1025:1329-32. doi: 10.1073/pnas.0409413102.
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Chromatin remodeling by DNA bending, not twisting.

Lorch Y , Davis B , Kornberg RD .


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Single-stranded regions (gaps) in nucleosomal DNA interfere with action of the RSC chromatin-remodeling complex, monitored by exposure of restriction endonuclease cutting sites. Single-strand breaks (nicks) in the DNA, by contrast, have no effect. Gaps on one side of the cutting site are inhibitory, but gaps on the other side are not. A gap >100 bp from the cutting site is as effective as a gap <20 bp from the site. These findings suggest a remodeling process involving bending, but not twisting, of the DNA and further point to the propagation of a bent region (loop or bulge) from one end of the nucleosome to the other.

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References [+] :
Aoyagi, hSWI/SNF-catalyzed nucleosome sliding does not occur solely via a twist-diffusion mechanism. 2002, Pubmed, Xenbase