5ong

From Proteopedia

(Difference between revisions)

Revision as of 08:54, 27 December 2017

X-Ray crystal structure of a nucleosome core particle with its DNA site-specifically crosslinked to the histone octamer

Structural highlights

5ong is a 10 chain structure with sequence from [1] and African clawed frog. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
NonStd Res:
Related:	5omx
Gene:	hist1h2aj, LOC494591 (African clawed frog)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[H2B11_XENLA] 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. [H4_XENLA] 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. [H32_XENLA] 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.

Publication Abstract from PubMed

We engineered nucleosome core particles (NCPs) with two site-specific cysteine crosslinks that increase the stability of the particle. The first disulfide was introduced between the two copies of H2A via a H2A-N38C point mutation, effectively crosslinking the two H2A/H2B heterodimers together to stabilize the histone octamer against H2A/H2B dimer dissociation. The second crosslink was engineered between a R40C point mutation on the N-terminal tail of H3 and the NCP DNA ends by the introduction of a convertible nucleotide. This crosslink maintains the nucleosome DNA in a fixed translational setting relative to the histone octamer and prevents dilution-driven dissociation. The X-ray crystal structures of NCPs containing the disulfides in isolation and in combination were determined. Both disulfides stabilize the structure of the nucleosome core particle without disturbing the overall structure. Nucleosomes containing these modifications will be advantageous for biochemical and structural studies as a consequence of their greater resistance to dissociation during high dilution in purification, elevated salt for crystallization and vitrification for cryo-EM.

Site-Specific Disulfide Crosslinked Nucleosomes with Enhanced Stability.,Frouws TD, Barth PD, Richmond TJ J Mol Biol. 2017 Nov 4. pii: S0022-2836(17)30522-3. doi:, 10.1016/j.jmb.2017.10.029. PMID:29113904^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Frouws TD, Barth PD, Richmond TJ. Site-Specific Disulfide Crosslinked Nucleosomes with Enhanced Stability. J Mol Biol. 2017 Nov 4. pii: S0022-2836(17)30522-3. doi:, 10.1016/j.jmb.2017.10.029. PMID:29113904 doi:http://dx.doi.org/10.1016/j.jmb.2017.10.029

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/5ong"

@@ Line 3: / Line 3: @@
 <StructureSection load='5ong' size='340' side='right' caption='[[5ong]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5ong]] is a 10 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5ONG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5ONG FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5ong]] is a 10 chain structure with sequence from [http://en.wikipedia.org/wiki/ ] and [http://en.wikipedia.org/wiki/African_clawed_frog African clawed frog]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5ONG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5ONG FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></td></tr>
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=G47:N2-ETHANETHIOL-2-DEOXY-GUANOSINE-5-MONOPHOSPHATE'>G47</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5omx|5omx]]</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">hist1h2aj, LOC494591 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=8355 African clawed frog])</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=5ong FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ong OCA], [http://pdbe.org/5ong PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5ong RCSB], [http://www.ebi.ac.uk/pdbsum/5ong PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5ong ProSAT]</span></td></tr>
 </table>
@@ Line 24: / Line 25: @@
 __TOC__
 </StructureSection>
+[[Category: African clawed frog]]
 [[Category: Barth, P D]]
 [[Category: Frouws, T D]]

5ong

From Proteopedia

Revision as of 08:54, 27 December 2017

X-Ray crystal structure of a nucleosome core particle with its DNA site-specifically crosslinked to the histone octamer

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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