View source for 8ohz


==Yeast 20S proteasome in complex with a photoswitchable cepafungin derivative (transCep1)==
<StructureSection load='8ohz' size='340' side='right'caption='[[8ohz]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8ohz]] is a 20 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8OHZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8OHZ 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]] 2.65&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=VOT:(2~{S},3~{R})-2-[2-[4-[2-(4-ethylphenyl)hydrazinyl]phenyl]ethanoylamino]-~{N}-[(5~{S},8~{S},10~{S})-5-methyl-10-oxidanyl-2,7-bis(oxidanylidene)-1,6-diazacyclododec-8-yl]-3-oxidanyl-butanamide'>VOT</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=8ohz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8ohz OCA], [https://pdbe.org/8ohz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8ohz RCSB], [https://www.ebi.ac.uk/pdbsum/8ohz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8ohz ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PSA2_YEAST PSA2_YEAST] The proteasome degrades poly-ubiquitinated proteins in the cytoplasm and in the nucleus. It is essential for the regulated turnover of proteins and for the removal of misfolded proteins. The proteasome is a multicatalytic proteinase complex that is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. It has an ATP-dependent proteolytic activity.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Photolipids have emerged as attractive tools for the optical control of lipid functions. They often contain an azobenzene photoswitch that imparts a cis double-bond upon irradiation. Herein, we present the application of photoswitching to a lipidated natural product, the potent proteasome inhibitor cepafungin I. Several azobenzene-containing lipids were attached to the cyclopeptide core, yielding photoswitchable derivatives. Most notably, PhotoCep4 exhibited a 10-fold higher cellular potency in its light-induced cis-form, matching the potency of natural cepafungin I. The length of the photolipid tail and distal positioning of the azobenzene photoswitch with respect to the macrocycle is critical for this activity. In a proteome-wide experiment, light-triggered PhotoCep4 modulation showed high overlap with constitutively active cepafungin I. The mode of action was studied using crystallography and revealed an identical binding of the cyclopeptide in comparison to cepafungin I, suggesting that differences in their cellular activity originate from switching the tail structure. The photopharmacological approach described herein could be applicable to many other natural products as lipid conjugation is common and often necessary for potent activity. Such lipids are often introduced late in synthetic routes, enabling facile chemical modifications.

Optical Control of Proteasomal Protein Degradation with a Photoswitchable Lipopeptide.,Morstein J, Amatuni A, Shuster A, Kuttenlochner W, Ko T, Abegg D, Groll M, Adibekian A, Renata H, Trauner DH Angew Chem Int Ed Engl. 2024 Feb 19;63(8):e202314791. doi: , 10.1002/anie.202314791. Epub 2024 Jan 16. PMID:38109686<ref>PMID:38109686</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8ohz" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Adibekian A]]
[[Category: Amatuni A]]
[[Category: Groll M]]
[[Category: Ko T]]
[[Category: Kuttenlochner W]]
[[Category: Morstein J]]
[[Category: Renata H]]
[[Category: Schuster A]]
[[Category: Trauner DH]]