- EMDB-43077: Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in ... -
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基本情報
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データベース: EMDB / ID: EMD-43077
タイトル
Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in complex with hibernation factor Msmeg1130 (Balon) and MsmegEF-Tu(GDP) (Structure 6)
マップデータ
Mycobacterium smegmatis 70S ribosome in complex with hibernation factor Msmeg1130 (Balon) and MsmegEF-Tu(GDP). Map
試料
複合体: Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in complex with hibernation factor Msmeg1130 (Balon) and MsmegEF-Tu(GDP) (Structure 6)
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM136936
米国
Welch Foundation
H-2032-20230405
米国
Other government
James W. McLaughlin Postdoctoral Fellowship
引用
ジャーナル: Nature / 年: 2024 タイトル: A new family of bacterial ribosome hibernation factors. 著者: Karla Helena-Bueno / Mariia Yu Rybak / Chinenye L Ekemezie / Rudi Sullivan / Charlotte R Brown / Charlotte Dingwall / Arnaud Baslé / Claudia Schneider / James P R Connolly / James N Blaza / ...著者: Karla Helena-Bueno / Mariia Yu Rybak / Chinenye L Ekemezie / Rudi Sullivan / Charlotte R Brown / Charlotte Dingwall / Arnaud Baslé / Claudia Schneider / James P R Connolly / James N Blaza / Bálint Csörgő / Patrick J Moynihan / Matthieu G Gagnon / Chris H Hill / Sergey V Melnikov / 要旨: To conserve energy during starvation and stress, many organisms use hibernation factor proteins to inhibit protein synthesis and protect their ribosomes from damage. In bacteria, two families of ...To conserve energy during starvation and stress, many organisms use hibernation factor proteins to inhibit protein synthesis and protect their ribosomes from damage. In bacteria, two families of hibernation factors have been described, but the low conservation of these proteins and the huge diversity of species, habitats and environmental stressors have confounded their discovery. Here, by combining cryogenic electron microscopy, genetics and biochemistry, we identify Balon, a new hibernation factor in the cold-adapted bacterium Psychrobacter urativorans. We show that Balon is a distant homologue of the archaeo-eukaryotic translation factor aeRF1 and is found in 20% of representative bacteria. During cold shock or stationary phase, Balon occupies the ribosomal A site in both vacant and actively translating ribosomes in complex with EF-Tu, highlighting an unexpected role for EF-Tu in the cellular stress response. Unlike typical A-site substrates, Balon binds to ribosomes in an mRNA-independent manner, initiating a new mode of ribosome hibernation that can commence while ribosomes are still engaged in protein synthesis. Our work suggests that Balon-EF-Tu-regulated ribosome hibernation is a ubiquitous bacterial stress-response mechanism, and we demonstrate that putative Balon homologues in Mycobacteria bind to ribosomes in a similar fashion. This finding calls for a revision of the current model of ribosome hibernation inferred from common model organisms and holds numerous implications for how we understand and study ribosome hibernation.
全体 : Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in ...
全体
名称: Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in complex with hibernation factor Msmeg1130 (Balon) and MsmegEF-Tu(GDP) (Structure 6)
要素
複合体: Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in complex with hibernation factor Msmeg1130 (Balon) and MsmegEF-Tu(GDP) (Structure 6)
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超分子 #1: Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in ...
超分子
名称: Cryo-EM structure of the Mycobacterium smegmatis 70S ribosome in complex with hibernation factor Msmeg1130 (Balon) and MsmegEF-Tu(GDP) (Structure 6) タイプ: complex / ID: 1 / 親要素: 0
由来(天然)
生物種: Mycolicibacterium smegmatis MC2 155 (バクテリア)
分子量
理論値: 2.6 MDa
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
緩衝液
pH: 7.5 詳細: 20 mM HEPES-KOH, 60 mM KCl, 10 mM MgCl2, 1 mM dithiothreitol