View source for 5t35


==The PROTAC MZ1 in complex with the second bromodomain of Brd4 and pVHL:ElonginC:ElonginB==
<StructureSection load='5t35' size='340' side='right'caption='[[5t35]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5t35]] is a 8 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=5T35 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5T35 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]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=759:(2~{S},4~{R})-1-[(2~{S})-2-[2-[2-[2-[2-[2-[(9~{S})-7-(4-CHLOROPHENYL)-4,5,13-TRIMETHYL-3-THIA-1,8,11,12-TETRAZATRICYCLO[8.3.0.0^{2,6}]TRIDECA-2(6),4,7,10,12-PENTAEN-9-YL]ETHANOYLAMINO]ETHOXY]ETHOXY]ETHOXY]ETHANOYLAMINO]-3,3-DIMETHYL-BUTANOYL]-~{N}-[[4-(4-METHYL-2,3-DIHYDRO-1,3-THIAZOL-5-YL)PHENYL]METHYL]-4-OXIDANYL-PYRROLIDINE-2-CARBOXAMIDE'>759</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=5t35 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5t35 OCA], [https://pdbe.org/5t35 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5t35 RCSB], [https://www.ebi.ac.uk/pdbsum/5t35 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5t35 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ELOB_HUMAN ELOB_HUMAN] SIII, also known as elongin, is a general transcription elongation factor that increases the RNA polymerase II transcription elongation past template-encoded arresting sites. Subunit A is transcriptionally active and its transcription activity is strongly enhanced by binding to the dimeric complex of the SIII regulatory subunits B and C (elongin BC complex).<ref>PMID:7638163</ref> <ref>PMID:15590694</ref>   The elongin BC complex seems to be involved as an adapter protein in the proteasomal degradation of target proteins via different E3 ubiquitin ligase complexes, including the von Hippel-Lindau ubiquitination complex CBC(VHL). By binding to BC-box motifs it seems to link target recruitment subunits, like VHL and members of the SOCS box family, to Cullin/RBX1 modules that activate E2 ubiquitination enzymes.<ref>PMID:7638163</ref> <ref>PMID:15590694</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Inducing macromolecular interactions with small molecules to activate cellular signaling is a challenging goal. PROTACs (proteolysis-targeting chimeras) are bifunctional molecules that recruit a target protein in proximity to an E3 ubiquitin ligase to trigger protein degradation. Structural elucidation of the key ternary ligase-PROTAC-target species and its impact on target degradation selectivity remain elusive. We solved the crystal structure of Brd4 degrader MZ1 in complex with human VHL and the Brd4 bromodomain (Brd4BD2). The ligand folds into itself to allow formation of specific intermolecular interactions in the ternary complex. Isothermal titration calorimetry studies, supported by surface mutagenesis and proximity assays, are consistent with pronounced cooperative formation of ternary complexes with Brd4BD2. Structure-based-designed compound AT1 exhibits highly selective depletion of Brd4 in cells. Our results elucidate how PROTAC-induced de novo contacts dictate preferential recruitment of a target protein into a stable and cooperative complex with an E3 ligase for selective degradation.

Structural basis of PROTAC cooperative recognition for selective protein degradation.,Gadd MS, Testa A, Lucas X, Chan KH, Chen W, Lamont DJ, Zengerle M, Ciulli A Nat Chem Biol. 2017 Mar 13. doi: 10.1038/nchembio.2329. PMID:28288108<ref>PMID:28288108</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5t35" style="background-color:#fffaf0;"></div>

==See Also==
*[[Bromodomain-containing protein 3D structures|Bromodomain-containing protein 3D structures]]
*[[Elongation factor 3D structures|Elongation factor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Ciulli A]]
[[Category: Gadd MS]]
[[Category: Zengerle M]]