Asymmetric nucleosomes flank promoters in the budding yeast genome.

Abstract:

:Nucleosomes in active chromatin are dynamic, but whether they have distinct structural conformations is unknown. To identify nucleosomes with alternative structures genome-wide, we used H4S47C-anchored cleavage mapping, which revealed that 5% of budding yeast (Saccharomyces cerevisiae) nucleosome positions have asymmetric histone-DNA interactions. These asymmetric interactions are enriched at nucleosome positions that flank promoters. Micrococcal nuclease (MNase) sequence-based profiles of asymmetric nucleosome positions revealed a corresponding asymmetry in MNase protection near the dyad axis, suggesting that the loss of DNA contacts around H4S47 is accompanied by protection of the DNA from MNase. Chromatin immunoprecipitation mapping of selected nucleosome remodelers indicated that asymmetric nucleosomes are bound by the RSC chromatin remodeling complex, which is required for maintaining nucleosomes at asymmetric positions. These results imply that the asymmetric nucleosome-RSC complex is a metastable intermediate representing partial unwrapping and protection of nucleosomal DNA on one side of the dyad axis during chromatin remodeling.

journal_name

Genome Res

journal_title

Genome research

authors

Ramachandran S,Zentner GE,Henikoff S

doi

10.1101/gr.182618.114

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

381-90

issue

3

eissn

1088-9051

issn

1549-5469

pii

gr.182618.114

journal_volume

25

pub_type

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