The chaperone Tsr2 regulates Rps26 release and reincorporation from mature ribosomes to enable a reversible, ribosome-mediated response to stress.

The chaperone Tsr2 regulates Rps26 release and reincorporation from mature ribosomes to enable a reversible, ribosome-mediated response to stress.
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DOI:
10.1126/sciadv.abl4386
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发表时间:
2022-02-25
期刊:
影响因子:
13.6
通讯作者:
Karbstein K
Karbstein K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yang YM;Karbstein K

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虽然核糖体组装是质量控制的,以维持蛋白质的动态平衡,但不同的核糖体群体已被描述。这些核糖体是如何形成的,特别是在影响能量水平和停止能量密集型核糖体生产的压力条件下,目前尚不清楚。在这里,我们展示了在高Na+、山梨醇或pH胁迫下,如何通过从完全组装的核糖体中解离Rps26来实现对这些胁迫的翻译反应,从而产生生理上相关的核糖体群体。伴侣蛋白TSR2在体外高Na+或高pH条件下释放Rps26,是Rps26在体内释放所必需的。此外,TSR2存储游离的Rps26并促进蛋白质的重新结合,从而在Na+胁迫消退后修复亚基。我们的数据表明,Rps26中的一个残基参与了钻石黑扇贫血的调节Na+的影响。这些数据表明,不同的核糖体群体如何在没有大量能量投入和没有绕过质量控制机制的情况下迅速出现。伴侣介导的蛋白质从核糖体中释放和重新结合能够实现生理性的翻译应激反应。
Although ribosome assembly is quality controlled to maintain protein homeostasis, different ribosome populations have been described. How these form, especially under stress conditions that affect energy levels and stop the energy-intensive production of ribosomes, remains unknown. Here, we demonstrate how a physiologically relevant ribosome population arises during high Na+, sorbitol, or pH stress via dissociation of Rps26 from fully assembled ribosomes to enable a translational response to these stresses. The chaperone Tsr2 releases Rps26 in the presence of high Na+ or pH in vitro and is required for Rps26 release in vivo. Moreover, Tsr2 stores free Rps26 and promotes reincorporation of the protein, thereby repairing the subunit after the Na+ stress subsides. Our data implicate a residue in Rps26 involved in Diamond Blackfan Anemia in mediating the effects of Na+. These data demonstrate how different ribosome populations can arise rapidly, without major energy input and without bypass of quality control mechanisms. Chaperone-mediated release and reincorporation of proteins from ribosomes enable a physiological translational stress response.
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