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-Structure paper
タイトル | Ribosome collisions induce mRNA cleavage and ribosome rescue in bacteria. |
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ジャーナル・号・ページ | Nature, Vol. 603, Issue 7901, Page 503-508, Year 2022 |
掲載日 | 2022年3月9日 |
![]() | Kazuki Saito / Hanna Kratzat / Annabelle Campbell / Robert Buschauer / A Maxwell Burroughs / Otto Berninghausen / L Aravind / Rachel Green / Roland Beckmann / Allen R Buskirk / ![]() ![]() |
PubMed 要旨 | Ribosome rescue pathways recycle stalled ribosomes and target problematic mRNAs and aborted proteins for degradation. In bacteria, it remains unclear how rescue pathways distinguish ribosomes stalled ...Ribosome rescue pathways recycle stalled ribosomes and target problematic mRNAs and aborted proteins for degradation. In bacteria, it remains unclear how rescue pathways distinguish ribosomes stalled in the middle of a transcript from actively translating ribosomes. Here, using a genetic screen in Escherichia coli, we discovered a new rescue factor that has endonuclease activity. SmrB cleaves mRNAs upstream of stalled ribosomes, allowing the ribosome rescue factor tmRNA (which acts on truncated mRNAs) to rescue upstream ribosomes. SmrB is recruited to ribosomes and is activated by collisions. Cryo-electron microscopy structures of collided disomes from E. coli and Bacillus subtilis show distinct and conserved arrangements of individual ribosomes and the composite SmrB-binding site. These findings reveal the underlying mechanisms by which ribosome collisions trigger ribosome rescue in bacteria. |
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手法 | EM (単粒子) |
解像度 | 3.37 - 13.29 Å |
構造データ | EMDB-13952, PDB-7qg8: EMDB-13955, PDB-7qgh: EMDB-13956, PDB-7qgn: EMDB-13958, PDB-7qgr: EMDB-13959, PDB-7qgu: EMDB-13961, PDB-7qh4: ![]() EMDB-13964: |
化合物 | ![]() ChemComp-MG: ![]() ChemComp-K: ![]() ChemComp-HOH: |
由来 |
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![]() | RIBOSOME / Ribosome rescue / disome / ribosome collision / stalling / no-go complex / nuclease / SmrB |