View source for 6zrc


==Structure of the human RBAP48 in complex with a macrocyclic peptide cyclized via a xylene linker attached to two cysteines==
<StructureSection load='6zrc' size='340' side='right'caption='[[6zrc]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6zrc]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ZRC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ZRC 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]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene>, <scene name='pdbligand=PXY:PARA-XYLENE'>PXY</scene></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=6zrc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6zrc OCA], [https://pdbe.org/6zrc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6zrc RCSB], [https://www.ebi.ac.uk/pdbsum/6zrc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6zrc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RBBP4_HUMAN RBBP4_HUMAN] Core histone-binding subunit that may target chromatin assembly factors, chromatin remodeling factors and histone deacetylases to their histone substrates in a manner that is regulated by nucleosomal DNA. Component of several complexes which regulate chromatin metabolism. These include the chromatin assembly factor 1 (CAF-1) complex, which is required for chromatin assembly following DNA replication and DNA repair; the core histone deacetylase (HDAC) complex, which promotes histone deacetylation and consequent transcriptional repression; the nucleosome remodeling and histone deacetylase complex (the NuRD complex), which promotes transcriptional repression by histone deacetylation and nucleosome remodeling; the PRC2/EED-EZH2 complex, which promotes repression of homeotic genes during development; and the NURF (nucleosome remodeling factor) complex.<ref>PMID:10866654</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The scaffolding protein RbAp48 is part of several epigenetic regulation complexes and is overexpressed in a variety of cancers. In order to develop tool compounds for the study of RbAp48 function, we have developed peptide inhibitors targeting the protein-protein interaction interface between RbAp48 and the scaffold protein MTA1. Based on a MTA1-derived linear peptide with low micromolar affinity and informed by crystallographic analysis, a bicyclic peptide was developed that inhibits the RbAp48/MTA1 interaction with a very low nanomolar KD value of 8.56 nM, and which showed appreciable stability against cellular proteases. Design included exchange of a polar amide cyclization strategy to hydrophobic aromatic linkers enabling mono- and bicyclization by means of cysteine alkylation, which improved affinity by direct interaction of the linkers with a hydrophobic residue on RbAp48. Our results demonstrate that stepwise evolution of a structure-based design is a suitable strategy for inhibitor development targeting PPIs.

Structure based design of bicyclic peptide inhibitors of RbAp48.,Waldmann H, 't Hart P, Hommen P, Noisier A, Krzyzanowski A, Schuler D, Porfetye AT, Akbarzadeh M, Vetter IR, Adihou H Angew Chem Int Ed Engl. 2020 Oct 6. doi: 10.1002/anie.202009749. PMID:33022847<ref>PMID:33022847</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6zrc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Retinoblastoma-binding protein 3D structures|Retinoblastoma-binding protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Porfetye AT]]
[[Category: Vetter IR]]