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Schizosaccharomyces pombe

ABSTRACT: The conserved role of the RSC chromatin remodeler in the establishment of nucleosome depleted regions

PROVIDER: PRJNA335620 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR3956180_1.fastq.gz	Fastqsanger.gz
	SRR3956180_2.fastq.gz	Fastqsanger.gz
	SRR3956181_1.fastq.gz	Fastqsanger.gz
	SRR3956181_2.fastq.gz	Fastqsanger.gz
	SRR3956178_1.fastq.gz	Fastqsanger.gz

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The conserved role of the RSC chromatin remodeler in the establishment of nucleosome depleted regions

Project description:The occupancy of nucleosomes governs access to the eukaryotic genomes and results from a combination of biophysical features and the effect of ATP-dependent remodeling complexes. Most promoter regions show a conserved pattern characterized by a nucleosome-depleted region (NDR) flanked by nucleosomal arrays. The conserved RSC remodeler was reported to be critical to establish NDR in vivo in budding yeast but other evidences suggested that this activity may not be conserved in fission yeast. By reanalysing and expanding previously published data, we propose that NDR formation is dependent on RSC in both yeast species. We also discuss the most prominent biological role of RSC and the possibility that non-essential subunits define alternate versions of the complex. Samples from mononucleosomal DNA from S. pombe strains h- kanR-tetO-snf21-Tap-natR ura4::rTetR-tup11 were sequenced (Illumina NextSeq 500 platform) using the pair-end read protocol

2016-08-24 | E-GEOD-84912 | biostudies-arrayexpress

The conserved role of the RSC chromatin remodeler in the establishment of nucleosome depleted regions

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Project description:The chromatin remodeler RSC prevents ectopic CENP-A assembly at pericentromeric heterochromatin

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Project description:Clustered regulatory signals at nucleosome-depleted regions punctuate a constant nucleosomal landscape in Schizosaccharomyces pombe [NGS_Illumina]

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Project description:Clustered regulatory signals at nucleosome-depleted regions punctuate a constant nucleosomal landscape in Schizosaccharomyces pombe [Affymetrix]

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Architecture of the chromatin remodeler RSC and insights into its nucleosome engagement

Project description:Eukaryotic DNA is packaged into nucleosome arrays, which are repositioned by chromatin remodeling complexes to control DNA accessibility. The Saccharomyces cerevisiae RSC (Remodeling the Structure of Chromatin) complex, a member of the SWI/SNF chromatin remodeler family, plays critical roles in genome maintenance, transcription, and DNA repair. Here, we report cryo-electron microscopy (cryo-EM) and crosslinking mass spectrometry (CLMS) studies of yeast RSC complex and show that RSC is composed of a rigid tripartite core and two flexible lobes. The core structure is scaffolded by an asymmetric Rsc8 dimer and built with the evolutionarily conserved subunits Sfh1, Rsc6, Rsc9 and Sth1. The flexible ATPase lobe, composed of helicase subunit Sth1, Arp7, Arp9 and Rtt102, is anchored to this core by the N-terminus of Sth1. Our cryo-EM analysis of RSC bound to a nucleosome core particle shows that in addition to the expected nucleosome-Sth1 interactions, RSC engages histones and nucleosomal DNA through one arm of the core structure, composed of the Rsc8 SWIRM domains, Sfh1 and Npl6. Our findings provide structural insights into the conserved assembly process for all members of the SWI/SNF family of remodelers, and illustrate how RSC selects, engages, and remodels nucleosomes.

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Project description:Abo1, a conserved bromodomain AAA-ATPase maintains global nucleosome occupancy and organization

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S. pombe genome-wide nucleosome mapping reveals positioning mechanisms distinct from S. cerevisiae

Project description:Positioned nucleosomes limit the access of proteins to DNA and implement regulatory features encoded in eukaryotic genomes. Here we generated the first genome-wide nucleosome positioning map for Schizosaccharomyces pombe and annotated transcription start and termination sites genome-wide. Using this resource we found surprising differences compared to the nucleosome organization in the distantly related yeast Saccharomyces cerevisiae [the cerevisiae data has been published by others (PMID: 17873876) and the raw data is deposited at ArrayExpress(E-MEXP-1172)]. DNA sequence guides nucleosome positioning differently, e.g., poly(dA:dT) elements are not enriched in S. pombe nucleosome-depleted regions (NDRs). Regular nucleosomal arrays emanate more asymmetrically, i.e., mainly co-directionally with transcription, from promoter NDRs, but promoters harbouring the histone variant H2A.Z show regular arrays also upstream. Regular nucleosome phasing in S. pombe has a very short repeat length of 154 base pairs, and requires a remodeler, Mit1, conserved in humans but not found in S. cerevisiae. Nucleosome positioning mechanisms are evidently not universal but evolutionarily plastic.

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