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[[Image:2idc.jpg|left|200px]]
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{{STRUCTURE_2idc|  PDB=2idc  |  SCENE=  }}
'''Structure of the Histone H3-Asf1 Chaperone Interaction'''


==Structure of the Histone H3-Asf1 Chaperone Interaction==
<StructureSection load='2idc' size='340' side='right'caption='[[2idc]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2idc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IDC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2IDC FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2idc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2idc OCA], [https://pdbe.org/2idc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2idc RCSB], [https://www.ebi.ac.uk/pdbsum/2idc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2idc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ASF1_YEAST ASF1_YEAST] Histone chaperone that facilitates histone deposition and histone exchange and removal during nucleosome assembly and disassembly. Facilitates histone deposition through both replication-dependent and replication-independent chromatin assembly pathways. Cooperates with chromatin assembly factor 1 (CAF-1) to promote replication-dependent chromatin assembly and with the HIR complex to promote replication-independent chromatin assembly, which may occur during transcription and DNA repair. May be required for the maintenance of a subset of replication elongation factors, including DNA polymerase epsilon, the RFC complex and PCNA, at stalled replication forks. Also required for acetylation of histone H3 on 'Lys-9' and 'Lys-56'.<ref>PMID:9290207</ref> <ref>PMID:10591219</ref> <ref>PMID:11412995</ref> <ref>PMID:11331602</ref> <ref>PMID:11731479</ref> <ref>PMID:11731480</ref> <ref>PMID:11404324</ref> <ref>PMID:11172707</ref> <ref>PMID:11856374</ref> <ref>PMID:11756556</ref> <ref>PMID:12093919</ref> <ref>PMID:14585955</ref> <ref>PMID:15071494</ref> <ref>PMID:15452122</ref> <ref>PMID:15175160</ref> <ref>PMID:15542829</ref> <ref>PMID:15542840</ref> <ref>PMID:15766286</ref> <ref>PMID:16303565</ref> <ref>PMID:15821127</ref> <ref>PMID:15901673</ref> <ref>PMID:16020781</ref> <ref>PMID:16143623</ref> <ref>PMID:16039596</ref> <ref>PMID:15632066</ref> <ref>PMID:15891116</ref> <ref>PMID:16141196</ref> <ref>PMID:15840725</ref> <ref>PMID:16815704</ref> <ref>PMID:16936140</ref> <ref>PMID:16582440</ref> <ref>PMID:16407267</ref> <ref>PMID:17046836</ref> <ref>PMID:16678113</ref> <ref>PMID:16501045</ref> <ref>PMID:16627621</ref> <ref>PMID:17107956</ref> <ref>PMID:17320445</ref> <ref>PMID:14680630</ref> [https://www.uniprot.org/uniprot/H3_YEAST H3_YEAST]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/id/2idc_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2idc ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: The histone H3/H4 chaperone Asf1 (anti-silencing function 1) is required for the establishment and maintenance of proper chromatin structure, as well as for genome stability in eukaryotes. Asf1 participates in both DNA replication-coupled (RC) and replication-independent (RI) histone deposition reactions in vitro and interacts with complexes responsible for both pathways in vivo. Asf1 is known to directly bind histone H3, however, high-resolution structural information about the geometry of this interaction was previously unknown. RESULTS: Here we report the structure of a histone/histone chaperone interaction. We have solved the 2.2 A crystal structure of the conserved N-terminal immunoglobulin fold domain of yeast Asf1 (residues 2-155) bound to the C-terminal helix of yeast histone H3 (residues 121-134). The structure defines a histone-binding patch on Asf1 consisting of both conserved and yeast-specific residues; mutation of these residues abrogates H3/H4 binding affinity. The geometry of the interaction indicates that Asf1 binds to histones H3/H4 in a manner that likely blocks sterically the H3/H3 interface of the nucleosomal four-helix bundle. CONCLUSION: These data clarify how Asf1 regulates histone stoichiometry to modulate epigenetic inheritance. The structure further suggests a physical model in which Asf1 contributes to interpretation of a "histone H3 barcode" for sorting H3 isoforms into different deposition pathways.


==Overview==
Structure of the yeast histone H3-ASF1 interaction: implications for chaperone mechanism, species-specific interactions, and epigenetics.,Antczak AJ, Tsubota T, Kaufman PD, Berger JM BMC Struct Biol. 2006 Dec 13;6:26. PMID:17166288<ref>PMID:17166288</ref>
BACKGROUND: The histone H3/H4 chaperone Asf1 (anti-silencing function 1) is required for the establishment and maintenance of proper chromatin structure, as well as for genome stability in eukaryotes. Asf1 participates in both DNA replication-coupled (RC) and replication-independent (RI) histone deposition reactions in vitro and interacts with complexes responsible for both pathways in vivo. Asf1 is known to directly bind histone H3, however, high-resolution structural information about the geometry of this interaction was previously unknown. RESULTS: Here we report the structure of a histone/histone chaperone interaction. We have solved the 2.2 A crystal structure of the conserved N-terminal immunoglobulin fold domain of yeast Asf1 (residues 2-155) bound to the C-terminal helix of yeast histone H3 (residues 121-134). The structure defines a histone-binding patch on Asf1 consisting of both conserved and yeast-specific residues; mutation of these residues abrogates H3/H4 binding affinity. The geometry of the interaction indicates that Asf1 binds to histones H3/H4 in a manner that likely blocks sterically the H3/H3 interface of the nucleosomal four-helix bundle. CONCLUSION: These data clarify how Asf1 regulates histone stoichiometry to modulate epigenetic inheritance. The structure further suggests a physical model in which Asf1 contributes to interpretation of a "histone H3 barcode" for sorting H3 isoforms into different deposition pathways.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
2IDC is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IDC OCA].
</div>
<div class="pdbe-citations 2idc" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Structure of the yeast histone H3-ASF1 interaction: implications for chaperone mechanism, species-specific interactions, and epigenetics., Antczak AJ, Tsubota T, Kaufman PD, Berger JM, BMC Struct Biol. 2006 Dec 13;6:26. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17166288 17166288]
*[[Anti-silencing factor 3D structures|Anti-silencing factor 3D structures]]
[[Category: Saccharomyces cerevisiae]]
== References ==
[[Category: Single protein]]
<references/>
[[Category: Antczak, A J.]]
__TOC__
[[Category: Berger, J M.]]
</StructureSection>
[[Category: Kaufman, P D.]]
[[Category: Large Structures]]
[[Category: Tsubota, T.]]
[[Category: Saccharomyces cerevisiae S288C]]
[[Category: Asf1]]
[[Category: Antczak AJ]]
[[Category: Chaperone]]
[[Category: Berger JM]]
[[Category: Chromatin]]
[[Category: Kaufman PD]]
[[Category: H3]]
[[Category: Tsubota T]]
[[Category: Histone]]
[[Category: Ig-like fold]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 07:21:57 2008''

Latest revision as of 10:09, 30 August 2023

Structure of the Histone H3-Asf1 Chaperone Interaction

2idc, resolution 2.20Å

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