7osa | pdb_00007osa

Pre-translocation complex of 80 S.cerevisiae ribosome with eEF2 and ligands

spinqualitylabelsall models 7osa, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7osa is a 10 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3Å Ligands: GTP, MG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A6A5Q627_YEASX Publication Abstract from PubMed Translation of the genetic code into proteins is realized through repetitions of synchronous translocation of messenger RNA (mRNA) and transfer RNAs (tRNA) through the ribosome. In eukaryotes translocation is ensured by elongation factor 2 (eEF2), which catalyses the process and actively contributes to its accuracy(1). Although numerous studies point to critical roles for both the conserved eukaryotic posttranslational modification diphthamide in eEF2 and tRNA modifications in supporting the accuracy of translocation, detailed molecular mechanisms describing their specific functions are poorly understood. Here we report a high-resolution X-ray structure of the eukaryotic 80S ribosome in a translocation-intermediate state containing mRNA, naturally modified eEF2 and tRNAs. The crystal structure reveals a network of stabilization of codon-anticodon interactions involving diphthamide(1) and the hypermodified nucleoside wybutosine at position 37 of phenylalanine tRNA, which is also known to enhance translation accuracy(2). The model demonstrates how the decoding centre releases a codon-anticodon duplex, allowing its movement on the ribosome, and emphasizes the function of eEF2 as a 'pawl' defining the directionality of translocation(3). This model suggests how eukaryote-specific elements of the 80S ribosome, eEF2 and tRNAs undergo large-scale molecular reorganizations to ensure maintenance of the mRNA reading frame during the complex process of translocation. Accuracy mechanism of eukaryotic ribosome translocation.,Djumagulov M, Demeshkina N, Jenner L, Rozov A, Yusupov M, Yusupova G Nature. 2021 Dec;600(7889):543-546. doi: 10.1038/s41586-021-04131-9. Epub 2021 , Dec 1. PMID:34853469 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Elongation factor 3D structures Ribosome 3D structures

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