Effects of nucleosome stability on remodeler-catalyzed repositioning

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Issue Date
2018-03-30Author
Morgan, Aaron M.
LeGresley, Sarah E.
Briggs, Koan
Al-Ani, Gada K.
Fischer, Christopher J.
Publisher
American Physical Society
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
©2018 American Physical Society
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Show full item recordAbstract
Chromatin remodelers are molecular motors that play essential roles in the regulation of nucleosome positioning and chromatin accessibility. These machines couple the energy obtained from the binding and hydrolysis of ATP to the mechanical work of manipulating chromatin structure through processes that are not completely understood. Here we present a quantitative analysis of nucleosome repositioning by the imitation switch (ISWI) chromatin remodeler and demonstrate that nucleosome stability significantly impacts the observed activity. We show how DNA damage induced changes in the affinity of DNA wrapping within the nucleosome can affect ISWI repositioning activity and demonstrate how assay-dependent limitations can bias studies of nucleosome repositioning. Together, these results also suggest that some of the diversity seen in chromatin remodeler activity can be attributed to the variations in the thermodynamics of interactions between the remodeler, the histones, and the DNA, rather than reflect inherent properties of the remodeler itself.
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Citation
Aaron M. Morgan, Sarah E. LeGresley, Koan Briggs, Gada Al-Ani, and Christopher J. Fischer. Effects of Nucleosome Stability on Remodeler-Catalyzed Repositioning. Physical Review E, 97(2018).
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