5avb: Difference between revisions
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==human nucleosome core particle== | ==human nucleosome core particle== | ||
<StructureSection load='5avb' size='340' side='right' caption='[[5avb]], [[Resolution|resolution]] 2.40Å' scene=''> | <StructureSection load='5avb' size='340' side='right' caption='[[5avb]], [[Resolution|resolution]] 2.40Å' scene=''> | ||
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5av5|5av5]], [[5av6|5av6]], [[5av8|5av8]], [[5av9|5av9]], [[5avc|5avc]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5av5|5av5]], [[5av6|5av6]], [[5av8|5av8]], [[5av9|5av9]], [[5avc|5avc]]</td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5avb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5avb OCA], [http://pdbe.org/5avb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5avb RCSB], [http://www.ebi.ac.uk/pdbsum/5avb PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5avb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5avb OCA], [http://pdbe.org/5avb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5avb RCSB], [http://www.ebi.ac.uk/pdbsum/5avb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5avb ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
Revision as of 12:56, 18 October 2017
human nucleosome core particlehuman nucleosome core particle
Structural highlights
Function[H2B1J_HUMAN] Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling.[1] [2] [3] Has broad antibacterial activity. May contribute to the formation of the functional antimicrobial barrier of the colonic epithelium, and to the bactericidal activity of amniotic fluid.[4] [5] [6] Publication Abstract from PubMedPost-translational modifications (PTMs) of histones, such as lysine acetylation of the N-terminal tails, play crucial roles in controlling gene expression. Due to the difficulty in reconstituting site-specifically acetylated nucleosomes with crystallization quality, structural analyses of histone acetylation are currently performed using synthesized tail peptides. Through engineering of the genetic code, translation termination, and cell-free protein synthesis, we reconstituted human H4-mono- to tetra-acetylated nucleosome core particles (NCPs), and solved the crystal structures of the H4-K5/K8/K12/K16-tetra-acetylated NCP and unmodified NCP at 2.4 A and 2.2 A resolutions, respectively. The structure of the H4-tetra-acetylated NCP resembled that of the unmodified NCP, and the DNA wrapped the histone octamer as precisely as in the unmodified NCP. However, the B-factors were significantly increased for the peripheral DNAs near the N-terminal tail of the intra- or inter-nucleosomal H4. In contrast, the B-factors were negligibly affected by the H4 tetra-acetylation in histone core residues, including those composing the acidic patch, and at H4-R23, which interacts with the acidic patch of the neighboring NCP. The present study revealed that the H4 tetra-acetylation impairs NCP self-association by changing the interactions of the H4 tail with DNA, and is the first demonstration of crystallization quality NCPs reconstituted with genuine PTMs. Intra- and inter-nucleosomal interactions of the histone H4 tail revealed with a human nucleosome core particle with genetically-incorporated H4 tetra-acetylation.,Wakamori M, Fujii Y, Suka N, Shirouzu M, Sakamoto K, Umehara T, Yokoyama S Sci Rep. 2015 Nov 26;5:17204. doi: 10.1038/srep17204. PMID:26607036[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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