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-Structure paper
| タイトル | The RNA helicase HrpA rescues collided ribosomes in E. coli. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 5, Page 999-1007.e7, Year 2025 |
| 掲載日 | 2025年3月6日 |
著者 | Annabelle Campbell / Hanna F Esser / A Maxwell Burroughs / Otto Berninghausen / L Aravind / Thomas Becker / Rachel Green / Roland Beckmann / Allen R Buskirk / ![]() |
| PubMed 要旨 | Although many antibiotics inhibit bacterial ribosomes, the loss of known factors that rescue stalled ribosomes does not lead to robust antibiotic sensitivity in E. coli, suggesting the existence of ...Although many antibiotics inhibit bacterial ribosomes, the loss of known factors that rescue stalled ribosomes does not lead to robust antibiotic sensitivity in E. coli, suggesting the existence of additional mechanisms. Here, we show that the RNA helicase HrpA rescues stalled ribosomes in E. coli. Acting selectively on ribosomes that have collided, HrpA uses ATP hydrolysis to split stalled ribosomes into subunits. Cryoelectron microscopy (cryo-EM) structures reveal how HrpA simultaneously binds to two collided ribosomes, explaining its selectivity, and how its helicase module engages downstream mRNA such that, by exerting a pulling force on the mRNA, it would destabilize the stalled ribosome. These studies show that ribosome splitting is a conserved mechanism that allows proteobacteria to tolerate ribosome-targeting antibiotics. |
リンク | Mol Cell / PubMed:39922193 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.1 - 3.2 Å |
| 構造データ | EMDB-51318, PDB-9gft: EMDB-51340, PDB-9ggr: |
| 由来 |
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キーワード | RIBOSOME / RNA helicase |
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