Histone H3 recognition by nucleosome-bound PRC2 subunit EZH2.
Map data
Shows the Relion 3.0 postprocessed cryo-EM map of the EZH2sub-Nucsub structure, generated by particle subtraction and focused 3D refinement.
Sample
Complex: EM map of EZH2 on nucleosome obtained from signal particle subtraction and focused refinement on PHF1-PRC2:dinucleosome map.
Complex: SUZ12 and EZH2
Protein or peptide: Isoform 2 of Histone-lysine N-methyltransferase EZH2,Isoform 2 of Histone-lysine N-methyltransferase EZH2,Histone-lysine N-methyltransferase EZH2,Isoform 2 of Histone-lysine N-methyltransferase EZH2,Isoform 2 of Histone-lysine N-methyltransferase EZH2
Journal: Elife / Year: 2020 Title: Structural basis for PRC2 decoding of active histone methylation marks H3K36me2/3. Authors: Ksenia Finogenova / Jacques Bonnet / Simon Poepsel / Ingmar B Schäfer / Katja Finkl / Katharina Schmid / Claudia Litz / Mike Strauss / Christian Benda / Jürg Müller / Abstract: Repression of genes by Polycomb requires that PRC2 modifies their chromatin by trimethylating lysine 27 on histone H3 (H3K27me3). At transcriptionally active genes, di- and tri-methylated H3K36 ...Repression of genes by Polycomb requires that PRC2 modifies their chromatin by trimethylating lysine 27 on histone H3 (H3K27me3). At transcriptionally active genes, di- and tri-methylated H3K36 inhibit PRC2. Here, the cryo-EM structure of PRC2 on dinucleosomes reveals how binding of its catalytic subunit EZH2 to nucleosomal DNA orients the H3 N-terminus via an extended network of interactions to place H3K27 into the active site. Unmodified H3K36 occupies a critical position in the EZH2-DNA interface. Mutation of H3K36 to arginine or alanine inhibits H3K27 methylation by PRC2 on nucleosomes . Accordingly, H3K36A and H3K36R mutants show reduced levels of H3K27me3 and defective Polycomb repression of HOX genes. The relay of interactions between EZH2, the nucleosomal DNA and the H3 N-terminus therefore creates the geometry that permits allosteric inhibition of PRC2 by methylated H3K36 in transcriptionally active chromatin.
History
Deposition
Oct 29, 2020
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Header (metadata) release
Dec 9, 2020
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Map release
Dec 9, 2020
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Update
May 1, 2024
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Current status
May 1, 2024
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Phenix Resolve Cryo EM tool was used on the Relion 3D refined map and half maps to generate a density modified map. This map showed significant improvement in the H3 tail.
Entire : EM map of EZH2 on nucleosome obtained from signal particle subtra...
Entire
Name: EM map of EZH2 on nucleosome obtained from signal particle subtraction and focused refinement on PHF1-PRC2:dinucleosome map.
Components
Complex: EM map of EZH2 on nucleosome obtained from signal particle subtraction and focused refinement on PHF1-PRC2:dinucleosome map.
Complex: SUZ12 and EZH2
Protein or peptide: Isoform 2 of Histone-lysine N-methyltransferase EZH2,Isoform 2 of Histone-lysine N-methyltransferase EZH2,Histone-lysine N-methyltransferase EZH2,Isoform 2 of Histone-lysine N-methyltransferase EZH2,Isoform 2 of Histone-lysine N-methyltransferase EZH2
Protein or peptide: Polycomb protein SUZ12
Complex: Histones
Protein or peptide: Histone H3.2
Protein or peptide: Histone H4
Protein or peptide: Histone H2A
Protein or peptide: Histone H2B 1.1
Complex: DNA
DNA: Widom601 DNA plus linker
DNA: Widom601 DNA plus linker
Ligand: ZINC ION
Ligand: S-ADENOSYL-L-HOMOCYSTEINE
+
Supramolecule #1: EM map of EZH2 on nucleosome obtained from signal particle subtra...
Supramolecule
Name: EM map of EZH2 on nucleosome obtained from signal particle subtraction and focused refinement on PHF1-PRC2:dinucleosome map. type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#8
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