8C83

Cryo-EM structure of in vitro reconstituted Otu2-bound Ub-40S complex

8C83 の概要

• エントリーDOI: 10.2210/pdb8c83/pdb
• EMDBエントリー: 16470
• 分子名称: OTU domain-containing protein 2, 40S ribosomal protein S9-A, 40S ribosomal protein S11-A, ... (18 entities in total)
• 機能のキーワード: 40s, ubiquitin, deubiquitinating enzyme, otu2, rps7, ribosome
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast); 詳細
• タンパク質・核酸の鎖数: 18
• 化学式量合計: 910077.23

構造登録者

Ikeuchi, K.,Buschauer, R.,Cheng, J.,Berninghausen, O.,Becker, T.,Beckmann, R. (登録日: 2023-01-18, 公開日: 2023-05-24, 最終更新日: 2024-07-24)

主引用文献

Ikeuchi, K.,Ivic, N.,Buschauer, R.,Cheng, J.,Frohlich, T.,Matsuo, Y.,Berninghausen, O.,Inada, T.,Becker, T.,Beckmann, R.
Molecular basis for recognition and deubiquitination of 40S ribosomes by Otu2.
Nat Commun, 14:2730-2730, 2023

PubMed Abstract: In actively translating 80S ribosomes the ribosomal protein eS7 of the 40S subunit is monoubiquitinated by the E3 ligase Not4 and deubiquitinated by Otu2 upon ribosomal subunit recycling. Despite its importance for translation efficiency the exact role and structural basis for this translational reset is poorly understood. Here, structural analysis by cryo-electron microscopy of native and reconstituted Otu2-bound ribosomal complexes reveals that Otu2 engages 40S subunits mainly between ribosome recycling and initiation stages. Otu2 binds to several sites on the intersubunit surface of the 40S that are not occupied by any other 40S-binding factors. This binding mode explains the discrimination against 80S ribosomes via the largely helical N-terminal domain of Otu2 as well as the specificity for mono-ubiquitinated eS7 on 40S. Collectively, this study reveals mechanistic insights into the Otu2-driven deubiquitination steps for translational reset during ribosome recycling/(re)initiation.

PubMed: 37169754
DOI: 10.1038/s41467-023-38161-w

実験手法

ELECTRON MICROSCOPY (3 Å)