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Histone H3 globular domain acetylation identifies new class of enhancers

ABSTRACT: Histone H3 globular domain acetylation identifies new class of enhancers

PROVIDER: PRJNA275703 | ENA |

REPOSITORIES: ENA

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Histone H3 globular domain acetylation identifies new class of enhancers

Project description:We report the acetylation of lysine residues in the globular domain of H3 (H3K64ac and H3K122ac) marks active gene promoters and also a subset of active enhancers in mouse embryonic stem cells (mESCs), human erythroleukemic cell line (K562). Moreover, we find a novel class of active functional enhancers in ESCs that are marked by H3K122ac but which lack H3K27ac. This work suggests that a more complex analysis of histone acetylation is required to identify enhancers than was previously considered.

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Histone H3 globular domain acetylation identifies novel enhancers

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Histone H3 globular domain acetylation identifies a new class of enhancers.

Project description: Not available

| S-EPMC4886833 | biostudies-literature

The ZZ domain of p300 mediates specificity of the adjacent HAT domain for histone H3

Project description:Human p300 is a transcriptional co-activator and a major acetyltransferase that acetylates histones and other proteins facilitating gene transcription. The activity of p300 relies on the fine-tuned interactome that involves a dozen p300 domains and hundreds of binding partners and links p300 to a wide range of vital signaling events. Here, we report on a novel function of the ZZ-type zinc finger (ZZ) of p300 as a reader of histone H3. We show that the ZZ domain and acetyllysine recognizing bromodomain (BD) of p300 play critical roles in modulating p300 enzymatic activity and its association with chromatin. Acetyllysine binding of BD is essential for acetylation of histones H3 and H4, whereas interaction of the ZZ domain with H3 promotes selective acetylation of histone H3K27 and H3K18.

2019-01-01 | GSE109591 | GEO

Adenovirus E1A Activation Domain Regulates H3 Acetylation Affecting Varied Steps in Transcription at Different Viral Promoters

Project description:While hypoacetylation of histone H3 lysines 18 and 27 is associated with repression, the step(s) in the overall process of transcription that is blocked at a hypoacetylated promoter is not clearly established in most instances. Studies presented here confirm that the adenovirus 2 large E1A protein activation domain interacts with p300 as reported by Pelka et al. 2009, and that the resulting acetylation of H3K18/27 affects varied steps in transcription at different viral promoters.

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Histone H3 acetylation of miRNA genes in HMEC and HMF

Project description:Normal cell type specific histone H3 acetylation of miRNA genes. HMEC and HMF represent two distinct differentiated cell type present in mammary gland each with a distinct phenotype, a distinct epigenotype as well as distinct miRNA expression pattern. The aim of the study was to determine how epigenetic modifications including histone H3 acetylation affect miRNA expression. Two cell types HMEC vs. HMF. Biological replicates: 3 pairs of HMEC-HMF of 3 distinct genotypes. Immunoprecipitation using anti-acetylated histone H3 antibody (06-599, Millipore).

2011-04-05 | E-GEOD-28375 | biostudies-arrayexpress

Histone H3K4 Demethylation is Negatively Regulated by Histone H3 Acetylation in S. cerevisiae

Project description:Histone H3 lysine 4 tri-methylation (H3K4me3) is a hallmark of transcription initiation, but how H3K4me3 is demethylated during gene repression is poorly understood. Jhd2, a JmjC domain protein, was recently identified as the major H3K4me3 histone demethylase (HDM) in S. cerevisiae. While JHD2 is required for removal of methylation upon gene repression, deletion of JHD2 does not result in increased levels of H3K4me3 in bulk histones, indicating that this HDM is unable to demethylate histones during steady state conditions. In this study, we showed that this was due to the negative regulation of Jhd2 activity by histone H3 lysine 14 acetylation, which co-localizes with H3K4me3 across the yeast genome. We demonstrated that loss of the histone H3-specific acetyltransferases (HATs) resulted in genome-wide-depletion of H3K4me3, and this was not due to a transcription defect. Moreover, H3K4me3 levels were reestablished in HAT mutants following loss of JHD2, which suggested that H3-specific HATs and Jhd2 served opposing functions in regulating H3K4me3 levels. We revealed the molecular basis for this suppression by demonstrating that histone H3K14 acetylation negatively regulated Jhd2 demethylase activity on an acetylated peptide in vitro. These results revealed the existence of a general mechanism for removal of H3K4me3 following gene repression. Examination of H3K4me3 in WT, ada2sas3, ada2sas3jhd2, and jhd2 strains.

2012-11-05 | E-GEOD-41424 | biostudies-arrayexpress

Adenovirus E1A Activation Domain Regulates H3 Acetylation Affecting Varied Steps in Transcription at Different Viral Promoters

Project description:Adenovirus E1A Activation Domain Regulates H3 Acetylation Affecting Varied Steps in Transcription at Different Viral Promoters

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Histone H3 acetylation of miRNA genes in HMEC and HMF

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Protein kinase C coordinates histone H3 phosphorylation and acetylation

Project description:The re-assembly of chromatin following DNA replication is a critical event in the maintenance of genome integrity. Histone H3 acetylation at K56 and phosphorylation at T45 are two important chromatin modifications that accompany chromatin assembly. Here we report a microarray expression study of the protein kinase Pkc1, histone acetyl transferase Rtt109 and histone H3 in Saccharomyces cerevisiae under conditions of replicative stress.

2015-12-04 | E-MTAB-3359 | biostudies-arrayexpress

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