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Structure of SWI/SNF chromatin remodeller RSC bound to a nucleosome

By Felix R. Wagner, Christian Dienemann, Haibo Wang, Alexandra St├╝tzer, Dimitry Tegunov, Henning Urlaub, Patrick Cramer

Posted 14 Oct 2019
bioRxiv DOI: 10.1101/800508 (published DOI: 10.1038/s41586-020-2088-0)

Chromatin remodelling complexes of the SWI/SNF family function in the formation of nucleosome-depleted regions and transcriptionally active promoters in the eukaryote genome. The structure of the Saccharomyces cerevisiae SWI/SNF family member RSC in complex with a nucleosome substrate reveals five protein modules and suggests key features of the remodelling mechanism. A DNA-interacting module grasps extra-nucleosomal DNA and helps to recruit RSC to promoters. The ATPase and arm modules sandwich the nucleosome disc with their 'SnAC' and 'finger' elements, respectively. The translocase motor engages with the edge of the nucleosome at superhelical location +2 to pump DNA along the nucleosome, resulting in a sliding of the histone octamer along DNA. The results elucidate how nucleosome-depleted regions are formed and provide a basis for understanding human chromatin remodelling complexes of the SWI/SNF family and the consequences of cancer mutations that frequently occur in these complexes.

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