6u4y
From Proteopedia
(Difference between revisions)
| Line 1: | Line 1: | ||
==Crystal Structure of an EZH2-EED Complex in an Oligomeric State== | ==Crystal Structure of an EZH2-EED Complex in an Oligomeric State== | ||
| - | <StructureSection load='6u4y' size='340' side='right'caption='[[6u4y]]' scene=''> | + | <StructureSection load='6u4y' size='340' side='right'caption='[[6u4y]], [[Resolution|resolution]] 2.91Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6U4Y OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6U4Y FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6u4y]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6U4Y OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6U4Y FirstGlance]. <br> |
| - | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6u4y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6u4y OCA], [http://pdbe.org/6u4y PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6u4y RCSB], [http://www.ebi.ac.uk/pdbsum/6u4y PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6u4y ProSAT]</span></td></tr> | + | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">EZH2, KMT6 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN]), EED ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> |
| + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Histone-lysine_N-methyltransferase Histone-lysine N-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.43 2.1.1.43] </span></td></tr> | ||
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6u4y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6u4y OCA], [http://pdbe.org/6u4y PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6u4y RCSB], [http://www.ebi.ac.uk/pdbsum/6u4y PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6u4y ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | == Disease == | ||
| + | [[http://www.uniprot.org/uniprot/EZH2_HUMAN EZH2_HUMAN]] Weaver syndrome. The disease is caused by mutations affecting the gene represented in this entry. | ||
| + | == Function == | ||
| + | [[http://www.uniprot.org/uniprot/EZH2_HUMAN EZH2_HUMAN]] Polycomb group (PcG) protein. Catalytic subunit of the PRC2/EED-EZH2 complex, which methylates 'Lys-9' (H3K9me) and 'Lys-27' (H3K27me) of histone H3, leading to transcriptional repression of the affected target gene. Able to mono-, di- and trimethylate 'Lys-27' of histone H3 to form H3K27me1, H3K27me2 and H3K27me3, respectively. Compared to EZH2-containing complexes, it is more abundant in embryonic stem cells and plays a major role in forming H3K27me3, which is required for embryonic stem cell identity and proper differentiation. The PRC2/EED-EZH2 complex may also serve as a recruiting platform for DNA methyltransferases, thereby linking two epigenetic repression systems. Genes repressed by the PRC2/EED-EZH2 complex include HOXC8, HOXA9, MYT1, CDKN2A and retinoic acid target genes. EZH2 can also methylate non-histone proteins such as the transcription factor GATA4 and the nuclear receptor RORA.<ref>PMID:14532106</ref> <ref>PMID:15385962</ref> <ref>PMID:15231737</ref> <ref>PMID:15225548</ref> <ref>PMID:16179254</ref> <ref>PMID:16618801</ref> <ref>PMID:16357870</ref> <ref>PMID:16936726</ref> <ref>PMID:17210787</ref> <ref>PMID:17344414</ref> <ref>PMID:19026781</ref> <ref>PMID:18285464</ref> <ref>PMID:20935635</ref> <ref>PMID:23063525</ref> [[http://www.uniprot.org/uniprot/EED_HUMAN EED_HUMAN]] Polycomb group (PcG) protein. Component of the PRC2/EED-EZH2 complex, which methylates 'Lys-9' and 'Lys-27' of histone H3, leading to transcriptional repression of the affected target gene. Also recognizes 'Lys-26' trimethylated histone H1 with the effect of inhibiting PRC2 complex methyltransferase activity on nucleosomal histone H3 'Lys-27', whereas H3 'Lys-27' recognition has the opposite effect, enabling the propagation of this repressive mark. The PRC2/EED-EZH2 complex may also serve as a recruiting platform for DNA methyltransferases, thereby linking two epigenetic repression systems. Genes repressed by the PRC2/EED-EZH2 complex include HOXC8, HOXA9, MYT1 and CDKN2A.<ref>PMID:9584199</ref> <ref>PMID:10581039</ref> <ref>PMID:14532106</ref> <ref>PMID:15385962</ref> <ref>PMID:15231737</ref> <ref>PMID:15225548</ref> <ref>PMID:16357870</ref> <ref>PMID:18285464</ref> <ref>PMID:20974918</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Enhancer of Zeste Homolog 2 (EZH2) is the catalytic subunit of Polycomb Repressive Complex 2 (PRC2), which minimally requires two other subunits, EED and SUZ12, for enzymatic activity. EZH2 has been traditionally known to mediate histone H3K27 trimethylation, a hallmark of silent chromatin. Emerging evidence indicates that EZH2 also activates gene expression in cancer cells in a context distinct from canonical PRC2. The molecular mechanism underlying the functional conversion of EZH2 from a gene repressor to an activator is unclear. Here, we show that EZH2 harbors a hidden, partially disordered transactivation domain (TAD) capable of interacting with components of active transcription machinery, mimicking archetypal acidic activators. The EZH2 TAD comprises the SRM (Stimulation-Responsive Motif) and SANT1 (SWI3, ADA2, N-CoR, and TFIIIB 1) regions that are normally involved in H3K27 methylation. The crystal structure of an EZH2-EED binary complex indicates that the EZH2 TAD mediates protein oligomerization in a noncanonical PRC2 context and is entirely sequestered. The EZH2 TAD can be unlocked by cancer-specific EZH2 phosphorylation events to undergo structural transitions that may enable subsequent transcriptional coactivator binding. The EZH2 TAD directly interacts with the transcriptional coactivator and histone acetyltransferase p300 and activates gene expression in a p300-dependent manner in cells. The corresponding TAD may also account for the gene activation function of EZH1, the paralog of EZH2. Distinct kinase signaling pathways that are known to abnormally convert EZH2 into a gene activator in cancer cells can now be understood in a common structural context of the EZH2 TAD. | ||
| + | |||
| + | A partially disordered region connects gene repression and activation functions of EZH2.,Jiao L, Shubbar M, Yang X, Zhang Q, Chen S, Wu Q, Chen Z, Rizo J, Liu X Proc Natl Acad Sci U S A. 2020 Jul 6. pii: 1914866117. doi:, 10.1073/pnas.1914866117. PMID:32631994<ref>PMID:32631994</ref> | ||
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 6u4y" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| + | [[Category: Histone-lysine N-methyltransferase]] | ||
| + | [[Category: Human]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
| - | [[Category: Jiao L]] | + | [[Category: Jiao, L]] |
| - | [[Category: Liu X]] | + | [[Category: Liu, X]] |
| + | [[Category: Methyltransferase]] | ||
| + | [[Category: Transcription]] | ||
| + | [[Category: Transferase]] | ||
Revision as of 11:36, 22 July 2020
Crystal Structure of an EZH2-EED Complex in an Oligomeric State
| |||||||||||
