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-Structure paper
| タイトル | Diverse mechanisms of translation arrest by a Clostridia ribosome stalling peptide CliM. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年5月18日 |
著者 | Mayu Yoshida / Felix Gersteuer / Ole Berendes / Keigo Fujiwara / Haaris A Safdari / Helge Paternoga / Hiraku Takada / Nozomu Obana / Helmut Grubmüller / Lars V Bock / Daniel N Wilson / Shinobu Chiba / ![]() |
| PubMed 要旨 | Ribosome arrest peptides undergo programmed translational stalling in response to changes in the cellular environment to feedback-regulate gene expression. CliM, an arrest peptide in Clostridia, is ...Ribosome arrest peptides undergo programmed translational stalling in response to changes in the cellular environment to feedback-regulate gene expression. CliM, an arrest peptide in Clostridia, is encoded upstream of the YidC membrane protein insertase gene, but its function and mechanism remain unclear. Here we show that CliM monitors YidC activity to maintain adequate cellular YidC capacity. Interestingly, Clostridium kluyveri CliM induces elongation arrest at multiple sense codons, whereas Clostridioides difficile CliM causes termination arrest. Cryo-EM-based structural and mutational analyses demonstrate that C. difficile CliM adopts multiple α-helices within the nascent polypeptide exit tunnel, where it forms extensive arrest-essential interactions with the ribosome. The residue immediately N-terminal to the stalling site contributes to arrest by sterically interfering with full accommodation of the release factor or aminoacyl-tRNA in the A-site. Molecular dynamics simulations suggest that membrane insertion of CliM induces sequential unwinding of these α-helical structures and relocation of the penultimate residue, thereby triggering arrest release. These findings provide a unified mechanistic framework that explains the distinct arrest behaviors of CliM homologs. |
リンク | Nat Commun / PubMed:42151144 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.3 - 2.8 Å |
| 構造データ | EMDB-50855, PDB-9fy1: EMDB-50856, PDB-9fy2: EMDB-50858, PDB-9fy3: |
| 化合物 | ![]() ChemComp-ZN: |
| 由来 |
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キーワード | RIBOSOME / Arrest peptide / Stalled ribosome complex / Bacillus subtilis / ApcF |
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