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Context Dependency of Set1/COMPASS Mediated H3 Lysine 4 Trimethylation

ABSTRACT: The stimulation of trimethylation of histone H3 lysine 4 (H3K4) by H2B monoubiquitination (H2Bub) has been widely studied with multiple mechanisms proposed for this form of histone crosstalk. Cps35/Swd2 within COMPASS is considered to bridge these processes. However, a truncated form of Set1 (762-Set1) is reported to function in H3K4 trimethylation without interacting with Cps35/Swd2, and such crosstalk is attributed to the n-SET domain of Set1 and its interaction with the Cps40/Spp1 subunit of COMPASS. Here, we use biochemical, structural, in vivo, and ChIP-seq approaches to demonstrate that Cps40/Spp1 and the n-SET domain of Set1 are required for the stability of Set1 and not the crosstalk. Furthermore, the apparent wild-type levels of H3K4 trimethylation (H3K4me3) in the 762-Set1 strain is due to rogue methylase activity of this mutant resulting in the mislocalization of H3K4me3 from the promoter-proximal regions to gene bodies and intergenic regions. We have also performed detailed screens and identified yeast strains lacking H2Bub, but containing intact H2Bub enzymes, that have normal levels of H3K4me3, suggesting that ubiquitination may not directly stimulate COMPASS, but rather works in a context of the PAF and Rad6/Bre1 complexes. Our study demonstrates that the ubiquitination machinery and Cps35/Swd2 function to focus COMPASS’ H3K4me3 activity at promoter-proximal regions in a context dependent manner.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE53241 | GEO | 2014/01/09

SECONDARY ACCESSION(S): PRJNA231240

REPOSITORIES: GEO

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Context Dependency of Set1/COMPASS Mediated H3 Lysine 4 Trimethylation

Project description:The stimulation of trimethylation of histone H3 lysine 4 (H3K4) by H2B monoubiquitination (H2Bub) has been widely studied with multiple mechanisms proposed for this form of histone crosstalk. Cps35/Swd2 within COMPASS is considered to bridge these processes. However, a truncated form of Set1 (762-Set1) is reported to function in H3K4 trimethylation without interacting with Cps35/Swd2, and such crosstalk is attributed to the n-SET domain of Set1 and its interaction with the Cps40/Spp1 subunit of COMPASS. Here, we use biochemical, structural, in vivo, and ChIP-seq approaches to demonstrate that Cps40/Spp1 and the n-SET domain of Set1 are required for the stability of Set1 and not the crosstalk. Furthermore, the apparent wild-type levels of H3K4 trimethylation (H3K4me3) in the 762-Set1 strain is due to rogue methylase activity of this mutant resulting in the mislocalization of H3K4me3 from the promoter-proximal regions to gene bodies and intergenic regions. We have also performed detailed screens and identified yeast strains lacking H2Bub, but containing intact H2Bub enzymes, that have normal levels of H3K4me3, suggesting that ubiquitination may not directly stimulate COMPASS, but rather works in a context of the PAF and Rad6/Bre1 complexes. Our study demonstrates that the ubiquitination machinery and Cps35/Swd2 function to focus COMPASS’ H3K4me3 activity at promoter-proximal regions in a context dependent manner. ChIP-Seq for H3K4ME3 in S. cerevisie wild-type strains and strains expressing a truncated form of Set1: aa762-1080 Set1. H3K4ME3 ChIP-Seq was also compared for wild-type, leo1 knockout, and chd1 knockout strains

2014-01-09 | E-GEOD-53241 | biostudies-arrayexpress

Swd2/Cps35 determines H3K4 tri-methylation via interactions with Set1 and Rad6_H3K4me3 ChIPseq in WT and several strains

Project description:Histone H3K4 tri-methylation (H3K4me3) catalyzed by Set1/COMPASS, is a prominent epigenetic mark found in promoter-proximal regions of actively transcribed genes. H3K4me3 relies on prior monoubiquitination at the histone H2B (H2Bub) by Rad6 and Bre1. Swd2/Cps35, a Set1/COMPASS component, has been proposed as a key player in facilitating H2Bub-dependent H3K4me3. However, a more comprehensive investigation regarding the relationship among Rad6, Swd2 and Set1 is required to further understand the mechanisms and functions of the H3K4 methylation. We investigated the genome-wide occupancy patterns of Rad6, Swd2 and Set1 under various genetic conditions, aiming to clarify the roles of Set1 and Rad6 for occupancy of Swd2. Swd2 peaks appear on both 5’region and 3’region of genes, which are overlapped with its tightly bound two complexes, Set1 and CPF (Cleavage and Polyadenylation Factor), respectively. In the absence of Rad6/H2Bub, Set1 predominantly localized to the 5ʹ region of genes, while Swd2 lost all the chromatin binding. However, in the absence of Set1, Swd2 occupancy near the 5’region was impared and rather increased in the 3’ region. This study highlights that catalytic activity of Rad6 is essential for all the ways of Swd2’s binding to the transcribed genes and Set1 redistributes the Swd2 to 5’region for accomplishments of H3K4me3 in the genome-wide level.

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Project description:Project abstract : The trimethylation of histone H3 lysine 4 (H3K4me3) is a crucial factor in defining the promoter regions of active genes in all eukaryotes ranging from Saccharomyces cerevisiae (yeast) to humans. In budding yeast, this trimethylation process facilitated by the Set1 complex results in H3K4me3 requiring a prior mono-ubiquitination at the histone H2BK123 residue (H2Bub) by E2 enzyme Rad6 and E3 enzyme Bre1. A previous in vitro study suggested that ubiquitinated H2B directly facilitates H3K4me3. However, even low levels of global H2Bub is sufficient for the required H3K4me3 in yeast cells, thereby indicating that other factors resulting in the H2Bub-dependent H3K4me3 remain unknown. This study revealed the high level of correlation of H3K4me3 with chromatin recruitment of Rad6 at the genome-wide level. Rad6 is confirmd to interact and co-localize with Swd2/Cps35, a key factor for the H2Bub-dependent H3K4me3 in genes with high levels of H3K4me3 and intronic genes rather than non-intronic genes. This study therefore provides a mechanistic insight of the H2Bub-Rad6- Swd2/Cps35-H3K4me3 axis and its potential role in RNA biogenesis.

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Project description:The functional determinants of histone H3 Lys-4 trimethylation (H3K4me3), their potential dependency on histone H2B monoubiquitination (H2Bub) and their contribution in defining gene expression programs are poorly defined in plant systems. Differently from S. cerevisiae in which a single SET1 protein catalyzes H3 Lys-4 trimethylation as part of COMPASS (COMPlex of proteins ASsociated with SET1), this activity involves multiple histone methyltransferases (HMTs) in Arabidopsis thaliana, among which the plant-specific SDG2 (SET DOMAIN GROUP2) has a prominent role. Here we report that SDG2 co-regulates hundreds genes with SWD2-like b (S2Lb), a plant ortholog of the Swd2 axillary subunit of the evolutionarily conserved COMPASS complex. Accordingly, S2Lb associates with the AtCOMPASS core subunit WDR5a within a high-molecular weight complex and is required for proper H3K4me3 enrichment over genes highly occupied by RNA Polymerase II. S2Lb knock-out plants display little transcriptomic defects, suggesting that H3K4me3 deposition is important for optimal gene induction rather than for determining on/off transcriptional states. We further report that S2Lb and H3K4me3 are accurately targeted over most genes in hub1 mutant plants lacking histone H2B monoubiquitination. Collectively, our study indicates that a plant-specific COMPASS-like complex acting mainly through an H2Bub-independent mechanism is a major determinant of H3K4me3 deposition in Arabidopsis.

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