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H3K27me3
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H3K27me3
H3K27me3 is an epigenetic modification to the DNA packaging protein histone H3. It is a mark that indicates the tri-methylation of lysine 27 on histone H3 protein.
This tri-methylation is associated with the downregulation of nearby genes via the formation of heterochromatic regions.
H3K27me3 indicates trimethylation of lysine 27 on histone H3 protein subunit:
This diagram shows the progressive methylation of a lysine residue. The tri-methylation (right) denotes the methylation present in H3K27me3.
The genomic DNA of eukaryotic cells is wrapped around special protein molecules known as histones. The complexes formed by the looping of the DNA are known as chromatin. The basic structural unit of chromatin is the nucleosome: this consists of the core octamer of histones (H2A, H2B, H3 and H4) as well as a linker histone and about 180 base pairs of DNA. These core histones are rich in lysine and arginine residues. The carboxyl (C) terminal end of these histones contribute to histone-histone interactions, as well as histone-DNA interactions. The amino (N) terminal charged tails are the site of the post-translational modifications, such as the one seen in H3K27me3.
The placement of a repressive mark on lysine 27 requires the recruitment of chromatin regulators by transcription factors. These modifiers are either histone modification complexes which covalently modify the histones to move around the nucleosomes and open the chromatin, or chromatin remodelling complexes which involve movement of the nucleosomes without directly modifying them. These histone marks can serve as docking sites of other co-activators as seen with H3K27me3. This occurs through polycomb mediated gene silencing via histone methylation and chromodomain interactions. A polycomb repressive complex (PRC); PRC2, mediates the tri-methylation of histone 3 on lysine 27 through histone methyl transferase activity. This mark can recruit PRC1 which will bind and contribute to the compaction of the chromatin.
The inflammatory transcription factor NF-κB can cause demethylation of H3K27me3 via Jmjd3.
H3K27me3 is linked to the repair of DNA damages, particularly repair of double-strand breaks by homologous recombinational repair.
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H3K27me3
H3K27me3 is an epigenetic modification to the DNA packaging protein histone H3. It is a mark that indicates the tri-methylation of lysine 27 on histone H3 protein.
This tri-methylation is associated with the downregulation of nearby genes via the formation of heterochromatic regions.
H3K27me3 indicates trimethylation of lysine 27 on histone H3 protein subunit:
This diagram shows the progressive methylation of a lysine residue. The tri-methylation (right) denotes the methylation present in H3K27me3.
The genomic DNA of eukaryotic cells is wrapped around special protein molecules known as histones. The complexes formed by the looping of the DNA are known as chromatin. The basic structural unit of chromatin is the nucleosome: this consists of the core octamer of histones (H2A, H2B, H3 and H4) as well as a linker histone and about 180 base pairs of DNA. These core histones are rich in lysine and arginine residues. The carboxyl (C) terminal end of these histones contribute to histone-histone interactions, as well as histone-DNA interactions. The amino (N) terminal charged tails are the site of the post-translational modifications, such as the one seen in H3K27me3.
The placement of a repressive mark on lysine 27 requires the recruitment of chromatin regulators by transcription factors. These modifiers are either histone modification complexes which covalently modify the histones to move around the nucleosomes and open the chromatin, or chromatin remodelling complexes which involve movement of the nucleosomes without directly modifying them. These histone marks can serve as docking sites of other co-activators as seen with H3K27me3. This occurs through polycomb mediated gene silencing via histone methylation and chromodomain interactions. A polycomb repressive complex (PRC); PRC2, mediates the tri-methylation of histone 3 on lysine 27 through histone methyl transferase activity. This mark can recruit PRC1 which will bind and contribute to the compaction of the chromatin.
The inflammatory transcription factor NF-κB can cause demethylation of H3K27me3 via Jmjd3.
H3K27me3 is linked to the repair of DNA damages, particularly repair of double-strand breaks by homologous recombinational repair.