View source for 7nsi


==55S mammalian mitochondrial ribosome with mtRRF (pre) and tRNA(P/E)==
<StructureSection load='7nsi' size='340' side='right'caption='[[7nsi]], [[Resolution|resolution]] 4.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7nsi]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7NSI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7NSI 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]] 4.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5GP:GUANOSINE-5-MONOPHOSPHATE'>5GP</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SPM:SPERMINE'>SPM</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=7nsi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7nsi OCA], [https://pdbe.org/7nsi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7nsi RCSB], [https://www.ebi.ac.uk/pdbsum/7nsi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7nsi ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A287BQA1_PIG A0A287BQA1_PIG] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The mitochondrial translation system originates from a bacterial ancestor but has substantially diverged in the course of evolution. Here, we use single-particle cryo-electron microscopy (cryo-EM) as a screening tool to identify mitochondrial translation termination mechanisms and to describe them in molecular detail. We show how mitochondrial release factor 1a releases the nascent chain from the ribosome when it encounters the canonical stop codons UAA and UAG. Furthermore, we define how the peptidyl-tRNA hydrolase ICT1 acts as a rescue factor on mitoribosomes that have stalled on truncated messages to recover them for protein synthesis. Finally, we present structural models detailing the process of mitochondrial ribosome recycling to explain how a dedicated elongation factor, mitochondrial EFG2 (mtEFG2), has specialized for cooperation with the mitochondrial ribosome recycling factor to dissociate the mitoribosomal subunits at the end of the translation process.

Structural basis of translation termination, rescue, and recycling in mammalian mitochondria.,Kummer E, Schubert KN, Schoenhut T, Scaiola A, Ban N Mol Cell. 2021 Jun 17;81(12):2566-2582.e6. doi: 10.1016/j.molcel.2021.03.042. , Epub 2021 Apr 19. PMID:33878294<ref>PMID:33878294</ref>

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

==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
*[[Ribosome recycling factor|Ribosome recycling factor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Sus scrofa]]
[[Category: Ban N]]
[[Category: Kummer E]]
[[Category: Schubert K]]