Abstract
We assess the role of intrinsic histone-DNA interactions by mapping nucleosomes assembled in vitro on genomic DNA. Nucleosomes strongly prefer yeast DNA over Escherichia coli DNA, indicating that the yeast genome evolved to favor nucleosome formation. Many yeast promoter and terminator regions intrinsically disfavor nucleosome formation, and nucleosomes assembled in vitro show strong rotational positioning. Nucleosome arrays generated by the ACF assembly factor have fewer nucleosome-free regions, reduced rotational positioning and less translational positioning than obtained by intrinsic histone-DNA interactions. Notably, nucleosomes assembled in vitro have only a limited preference for specific translational positions and do not show the pattern observed in vivo. Our results argue against a genomic code for nucleosome positioning, and they suggest that the nucleosomal pattern in coding regions arises primarily from statistical positioning from a barrier near the promoter that involves some aspect of transcriptional initiation by RNA polymerase II.
MeSH Terms
Chromatin/metabolism
DNA, Bacterial/chemistry,genetics,metabolism
DNA, Fungal/chemistry,genetics,metabolism
Endodeoxyribonucleases/metabolism
Escherichia coli/genetics
Escherichia coli Proteins/genetics,metabolism
Histones/genetics,metabolism
Nucleosomes/metabolism
Protein Binding
Saccharomyces cerevisiae/genetics
Saccharomyces cerevisiae Proteins/genetics,metabolism
Sequence Analysis, DNA
Transcription Initiation Site
Transcription, Genetic
Chemicals
Chromatin
DNA, Bacterial
DNA, Fungal
Escherichia coli Proteins
Histones
Nucleosomes
Saccharomyces cerevisiae Proteins
Endodeoxyribonucleases
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Zhang Yong
Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard School of Public Health, Boston, Massachusetts, USA.
Moqtaderi Zarmik
Rattner Barbara P
Euskirchen Ghia
Snyder Michael
Kadonaga James T
Liu X Shirley
Struhl Kevin
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