7nsi

55S mammalian mitochondrial ribosome with mtRRF (pre) and tRNA(P/E)

spinqualitylabelsall models 7nsi, resolution 4.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7nsi is a 10 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 4.6Å Ligands: 5GP, GTP, MG, SPM, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A287BQA1_PIG 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosome 3D structures Ribosome recycling factor

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