View source for 8gym


==Cryo-EM structure of Tetrahymena thermophila respiratory mega-complex MC IV2+(I+III2+II)2==
<StructureSection load='8gym' size='340' side='right'caption='[[8gym]], [[Resolution|resolution]] 2.96&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8gym]] is a 20 chain structure with sequence from [https://en.wikipedia.org/wiki/Tetrahymena_thermophila_SB210 Tetrahymena thermophila SB210]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8GYM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8GYM 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]] 2.96&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3PE:1,2-DIACYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE'>3PE</scene>, <scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CDL:CARDIOLIPIN'>CDL</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=HEA:HEME-A'>HEA</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene>, <scene name='pdbligand=P5S:O-[(R)-{[(2R)-2,3-BIS(OCTADECANOYLOXY)PROPYL]OXY}(HYDROXY)PHOSPHORYL]-L-SERINE'>P5S</scene>, <scene name='pdbligand=PC1:1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>PC1</scene>, <scene name='pdbligand=PX2:1,2-DILAUROYL-SN-GLYCERO-3-PHOSPHATE'>PX2</scene>, <scene name='pdbligand=SEP:PHOSPHOSERINE'>SEP</scene>, <scene name='pdbligand=T7X:PHOSPHATIDYLINOSITOL'>T7X</scene>, <scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</scene>, <scene name='pdbligand=U10:UBIQUINONE-10'>U10</scene>, <scene name='pdbligand=ZMP:S-[2-({N-[(2S)-2-HYDROXY-3,3-DIMETHYL-4-(PHOSPHONOOXY)BUTANOYL]-BETA-ALANYL}AMINO)ETHYL]+TETRADECANETHIOATE'>ZMP</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=8gym FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8gym OCA], [https://pdbe.org/8gym PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8gym RCSB], [https://www.ebi.ac.uk/pdbsum/8gym PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8gym ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/W7X3D6_TETTS W7X3D6_TETTS] Mitochondrial intermembrane chaperone that participates in the import and insertion of some multi-pass transmembrane proteins into the mitochondrial inner membrane. Also required for the transfer of beta-barrel precursors from the TOM complex to the sorting and assembly machinery (SAM complex) of the outer membrane. Acts as a chaperone-like protein that protects the hydrophobic precursors from aggregation and guide them through the mitochondrial intermembrane space.[RuleBase:RU367043]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Tetrahymena thermophila, a classic ciliate model organism, has been shown to possess tubular mitochondrial cristae and highly divergent electron transport chain involving four transmembrane protein complexes (I-IV). Here we report cryo-EM structures of its ~8 MDa megacomplex IV(2 )+ (I + III(2 )+ II)(2), as well as a ~ 10.6 MDa megacomplex (IV(2) + I + III(2 )+ II)(2) at lower resolution. In megacomplex IV(2 )+ (I + III(2 )+ II)(2), each CIV(2) protomer associates one copy of supercomplex I + III(2) and one copy of CII, forming a half ring-shaped architecture that adapts to the membrane curvature of mitochondrial cristae. Megacomplex (IV(2 )+ I + III(2 )+ II)(2) defines the relative position between neighbouring half rings and maintains the proximity between CIV(2) and CIII(2) cytochrome c binding sites. Our findings expand the current understanding of divergence in eukaryotic electron transport chain organization and how it is related to mitochondrial morphology.

Structures of Tetrahymena thermophila respiratory megacomplexes on the tubular mitochondrial cristae.,Han F, Hu Y, Wu M, He Z, Tian H, Zhou L Nat Commun. 2023 May 29;14(1):2542. doi: 10.1038/s41467-023-38158-5. PMID:37248254<ref>PMID:37248254</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8gym" style="background-color:#fffaf0;"></div>

==See Also==
*[[Succinate dehydrogenase 3D structures|Succinate dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Tetrahymena thermophila SB210]]
[[Category: Han FZ]]
[[Category: Hu YQ]]
[[Category: Wu MC]]
[[Category: Zhou L]]