- EMDB-42573: Focus refined map of the swiveled head domain of the 30S subunit ... -
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基本情報
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データベース: EMDB / ID: EMD-42573
タイトル
Focus refined map of the swiveled head domain of the 30S subunit of ratcheted Listeria innocua ribosome in complex with HflXr and pe/E-tRNA (structure II-D)
マップデータ
Focus refined cryo-EM map of Listeria innocua 30S head from Structure II-D
試料
複合体: Listeria innocua 70S ribosome in complex with HflXr and pe/E-tRNA
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM136936
米国
Welch Foundation
H-2032-20230405
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32-GM008280
米国
引用
ジャーナル: Nucleic Acids Res / 年: 2024 タイトル: Mechanistic insights into the alternative ribosome recycling by HflXr. 著者: Savannah M Seely / Ritwika S Basu / Matthieu G Gagnon / 要旨: During stress conditions such as heat shock and antibiotic exposure, ribosomes stall on messenger RNAs, leading to inhibition of protein synthesis. To remobilize ribosomes, bacteria use rescue ...During stress conditions such as heat shock and antibiotic exposure, ribosomes stall on messenger RNAs, leading to inhibition of protein synthesis. To remobilize ribosomes, bacteria use rescue factors such as HflXr, a homolog of the conserved housekeeping GTPase HflX that catalyzes the dissociation of translationally inactive ribosomes into individual subunits. Here we use time-resolved cryo-electron microscopy to elucidate the mechanism of ribosome recycling by Listeria monocytogenes HflXr. Within the 70S ribosome, HflXr displaces helix H69 of the 50S subunit and induces long-range movements of the platform domain of the 30S subunit, disrupting inter-subunit bridges B2b, B2c, B4, B7a and B7b. Our findings unveil a unique ribosome recycling strategy by HflXr which is distinct from that mediated by RRF and EF-G. The resemblance between HflXr and housekeeping HflX suggests that the alternative ribosome recycling mechanism reported here is universal in the prokaryotic kingdom.