8CDR

Translocation intermediate 2 (TI-2) of 80S S. cerevisiae ribosome with ligands and eEF2 in the presence of sordarin

これはPDB形式変換不可エントリーです。

8CDR の概要

• エントリーDOI: 10.2210/pdb8cdr/pdb
• 関連するPDBエントリー: 8CCS 8CDL
• EMDBエントリー: 16563 16591 16594
• 分子名称: 40S ribosomal protein S24-A, 60S ribosomal protein L16-A, 25S ribosomal RNA, ... (91 entities in total)
• 機能のキーワード: eukaryote, ribosome, translocation, elongation
• 由来する生物種: Escherichia coli; 詳細
• タンパク質・核酸の鎖数: 84
• 化学式量合計: 3308557.25

構造登録者

Milicevic, N.,Jenner, L.,Myasnikov, A.,Yusupov, M.,Yusupova, G. (登録日: 2023-01-31, 公開日: 2023-09-20, 最終更新日: 2024-04-24)

主引用文献

Milicevic, N.,Jenner, L.,Myasnikov, A.,Yusupov, M.,Yusupova, G.
mRNA reading frame maintenance during eukaryotic ribosome translocation.
Nature, 625:393-400, 2024

PubMed Abstract: One of the most critical steps of protein synthesis is coupled translocation of messenger RNA (mRNA) and transfer RNAs (tRNAs) required to advance the mRNA reading frame by one codon. In eukaryotes, translocation is accelerated and its fidelity is maintained by elongation factor 2 (eEF2). At present, only a few snapshots of eukaryotic ribosome translocation have been reported. Here we report ten high-resolution cryogenic-electron microscopy (cryo-EM) structures of the elongating eukaryotic ribosome bound to the full translocation module consisting of mRNA, peptidyl-tRNA and deacylated tRNA, seven of which also contained ribosome-bound, naturally modified eEF2. This study recapitulates mRNA-tRNA-growing peptide module progression through the ribosome, from the earliest states of eEF2 translocase accommodation until the very late stages of the process, and shows an intricate network of interactions preventing the slippage of the translational reading frame. We demonstrate how the accuracy of eukaryotic translocation relies on eukaryote-specific elements of the 80S ribosome, eEF2 and tRNAs. Our findings shed light on the mechanism of translation arrest by the anti-fungal eEF2-binding inhibitor, sordarin. We also propose that the sterically constrained environment imposed by diphthamide, a conserved eukaryotic posttranslational modification in eEF2, not only stabilizes correct Watson-Crick codon-anticodon interactions but may also uncover erroneous peptidyl-tRNA, and therefore contribute to higher accuracy of protein synthesis in eukaryotes.

PubMed: 38030725
DOI: 10.1038/s41586-023-06780-4

実験手法

ELECTRON MICROSCOPY (2.04 Å)