View source for 7w3k


==Structure of USP14-bound human 26S proteasome in substrate-inhibited state SD4_USP14==
<StructureSection load='7w3k' size='340' side='right'caption='[[7w3k]], [[Resolution|resolution]] 3.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7w3k]] is a 16 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=7W3K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7W3K FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=7w3k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7w3k OCA], [https://pdbe.org/7w3k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7w3k RCSB], [https://www.ebi.ac.uk/pdbsum/7w3k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7w3k ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PRS7_HUMAN PRS7_HUMAN] The 26S protease is involved in the ATP-dependent degradation of ubiquitinated proteins. The regulatory (or ATPase) complex confers ATP dependency and substrate specificity to the 26S complex. In case of HIV-1 infection, positive modulator of Tat-mediated transactivation.<ref>PMID:9295362</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Proteasomal degradation of ubiquitylated proteins is tightly regulated at multiple levels(1-3). A primary regulatory checkpoint is the removal of ubiquitin chains from substrates by the deubiquitylating enzyme ubiquitin-specific protease 14 (USP14), which reversibly binds the proteasome and confers the ability to edit and reject substrates. How USP14 is activated and regulates proteasome function remain unknown(4-7). Here we present high-resolution cryo-electron microscopy structures of human USP14 in complex with the 26S proteasome in 13 distinct conformational states captured during degradation of polyubiquitylated proteins. Time-resolved cryo-electron microscopy analysis of the conformational continuum revealed two parallel pathways of proteasome state transitions induced by USP14, and captured transient conversion of substrate-engaged intermediates into substrate-inhibited intermediates. On the substrate-engaged pathway, ubiquitin-dependent activation of USP14 allosterically reprograms the conformational landscape of the AAA-ATPase motor and stimulates opening of the core particle gate(8-10), enabling observation of a near-complete cycle of asymmetric ATP hydrolysis around the ATPase ring during processive substrate unfolding. Dynamic USP14-ATPase interactions decouple the ATPase activity from RPN11-catalysed deubiquitylation(11-13) and kinetically introduce three regulatory checkpoints on the proteasome, at the steps of ubiquitin recognition, substrate translocation initiation and ubiquitin chain recycling. These findings provide insights into the complete functional cycle of the USP14-regulated proteasome and establish mechanistic foundations for the discovery of USP14-targeted therapies.

USP14-regulated allostery of the human proteasome by time-resolved cryo-EM.,Zhang S, Zou S, Yin D, Zhao L, Finley D, Wu Z, Mao Y Nature. 2022 May;605(7910):567-574. doi: 10.1038/s41586-022-04671-8. Epub 2022 , Apr 27. PMID:35477760<ref>PMID:35477760</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7w3k" style="background-color:#fffaf0;"></div>

==See Also==
*[[Proteasome 3D structures|Proteasome 3D structures]]
*[[Thioesterase 3D structures|Thioesterase 3D structures]]
*[[Thyroid hormone receptor 3D structures|Thyroid hormone receptor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mao Y]]
[[Category: Wu Z]]
[[Category: Yin D]]
[[Category: Zhang S]]
[[Category: Zou S]]