Abstract
Nucleosomes are the fundamental subunits of eukaryotic chromatin. They are not static entities, but can undergo a number of dynamic transitions, including spontaneous repositioning along DNA. As nucleosomes are spaced close together within genomes, it is likely that on occasion they approach each other and may even collide. Here we have used a dinucleosomal model system to show that the 147-base-pair (bp) DNA territories of two nucleosomes can overlap extensively. In the situation of an overlap by 44 bp or 54 bp, one histone dimer is lost and the resulting complex can condense to form a compact single particle. We propose a pathway in which adjacent nucleosomes promote DNA unraveling as they approach each other and that this permits their 147-bp territories to overlap, and we suggest that these events may represent early steps in a pathway for nucleosome removal via collision.
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Direct observation of coordinated DNA movements on the nucleosome during chromatin remodelling
Nature Communications Open Access 12 April 2019
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Acknowledgements
We would like to thank D. Lamont and K. Beattie for assistance with MS and D. Norman for assistance with modeling. We thank members of the T.O.-H. laboratory for valuable suggestions. M.d.J. and J.v.N. were financially supported by the 'Netherlands Organisation for Scientific Research' (NWO) and the European Science Foundation (ESF). M.E. (Studentship), A.F. and T.O.-H. were funded by the Wellcome Trust (Senior Fellowship 064414).
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M.E. carried out most of the experimental work and data analysis; M.d.J. and J.v.N. carried out AFM and associated data analysis; A.F. performed the assays in Figure 5; R.B. assisted with the modeling of the dinucleosome structure; M.E. and T.O.-H. designed the experiments and wrote the manuscript.
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Engeholm, M., de Jager, M., Flaus, A. et al. Nucleosomes can invade DNA territories occupied by their neighbors. Nat Struct Mol Biol 16, 151–158 (2009). https://doi.org/10.1038/nsmb.1551
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DOI: https://doi.org/10.1038/nsmb.1551
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