View source for 9cjk


==Human TMED9 octamer structure==
<StructureSection load='9cjk' size='340' side='right'caption='[[9cjk]], [[Resolution|resolution]] 3.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9cjk]] 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=9CJK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9CJK 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]] 3.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=9ED:[(2~{R})-2-[(~{E})-octadec-9-enoyl]oxy-3-[oxidanyl-[(1~{R},2~{R},3~{S},4~{R},5~{R},6~{S})-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl]+(~{E})-octadec-9-enoate'>9ED</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=9cjk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9cjk OCA], [https://pdbe.org/9cjk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9cjk RCSB], [https://www.ebi.ac.uk/pdbsum/9cjk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9cjk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TMED9_HUMAN TMED9_HUMAN] Appears to be involved in vesicular protein trafficking, mainly in the early secretory pathway. In COPI vesicle-mediated retrograde transport involved in the coatomer recruitment to membranes of the early secretory pathway. Increases coatomer-dependent activity of ARFGAP2. Thought to play a crucial role in the specific retention of p24 complexes in cis-Golgi membranes; specifically contributes to the coupled localization of TMED2 and TMED10 in the cis-Golgi network. May be involved in organization of intracellular membranes, such as of the ER-Golgi intermediate compartment and the Golgi apparatus. Involved in ER localization of PTPN2 isoform PTPB.<ref>PMID:10852829</ref> <ref>PMID:14600267</ref> <ref>PMID:16595549</ref> <ref>PMID:18287528</ref> <ref>PMID:19296914</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Intracellular accumulation of misfolded proteins causes serious human proteinopathies. The transmembrane emp24 domain 9 (TMED9) cargo receptor promotes a general mechanism of cytotoxicity by entrapping misfolded protein cargos in the early secretory pathway. However, the molecular basis for this TMED9-mediated cargo retention remains elusive. Here, we report cryo-electron microscopy structures of TMED9, which reveal its unexpected self-oligomerization into octamers, dodecamers, and, by extension, even higher-order oligomers. The TMED9 oligomerization is driven by an intrinsic symmetry mismatch between the trimeric coiled coil domain and the tetrameric transmembrane domain. Using frameshifted Mucin 1 as an example of aggregated disease-related protein cargo, we implicate a mode of direct interaction with the TMED9 luminal Golgi-dynamics domain. The structures suggest and we confirm that TMED9 oligomerization favors the recruitment of coat protein I (COPI), but not COPII coatomers, facilitating retrograde transport and explaining the observed cargo entrapment. Our work thus reveals a molecular basis for TMED9-mediated misfolded protein retention in the early secretory pathway.

Molecular basis of TMED9 oligomerization and entrapment of misfolded protein cargo in the early secretory pathway.,Xiao L, Pi X, Goss AC, El-Baba T, Ehrmann JF, Grinkevich E, Bazua-Valenti S, Padovano V, Alper SL, Carey D, Udeshi ND, Carr SA, Pablo JL, Robinson CV, Greka A, Wu H Sci Adv. 2024 Sep 20;10(38):eadp2221. doi: 10.1126/sciadv.adp2221. Epub 2024 Sep , 20. PMID:39303030<ref>PMID:39303030</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 9cjk" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Le X]]
[[Category: Xiong P]]