Abstract:
:ATP-dependent chromatin remodelling enzymes (remodellers) regulate DNA accessibility in eukaryotic genomes. Many remodellers reposition (slide) nucleosomes, however, how DNA is propagated around the histone octamer during this process is unclear. Here we examine the real-time coordination of remodeller-induced DNA movements on both sides of the nucleosome using three-colour single-molecule FRET. During sliding by Chd1 and SNF2h remodellers, DNA is shifted discontinuously, with movement of entry-side DNA preceding that of exit-side DNA. The temporal delay between these movements implies a single rate-limiting step dependent on ATP binding and transient absorption or buffering of at least one base pair. High-resolution cross-linking experiments show that sliding can be achieved by buffering as few as 3 bp between entry and exit sides of the nucleosome. We propose that DNA buffering ensures nucleosome stability during ATP-dependent remodelling, and provides a means for communication between remodellers acting on opposite sides of the nucleosome.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Sabantsev A,Levendosky RF,Zhuang X,Bowman GD,Deindl Sdoi
10.1038/s41467-019-09657-1subject
Has Abstractpub_date
2019-04-12 00:00:00pages
1720issue
1issn
2041-1723pii
10.1038/s41467-019-09657-1journal_volume
10pub_type
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