The Unfolded Protein Response Triggers Site-Specific Regulatory Ubiquitylation of 40S Ribosomal Proteins.

The Unfolded Protein Response Triggers Site-Specific Regulatory Ubiquitylation of 40S Ribosomal Proteins.
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DOI:
10.1016/j.molcel.2015.04.026
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发表时间:
2015-07-02
期刊:
影响因子:
16
通讯作者:
Bennett, Eric J.
Bennett, Eric J.
中科院分区:
生物学1区
文献类型:
--
作者:
Higgins, Renee;Gendron, Joshua M.;Rising, Lisa;Mak, Raymond;Webb, Kristofor;Kaiser, Stephen E.;Zuzow, Nathan;Riviere, Paul;Yang, Bing;Fenech, Emma;Tang, Xin;Lindsay, Scott A.;Christianson, John C.;Hampton, Randolph Y.;Wasserman, Steven A.;Bennett, Eric J.

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对内质网(ER)稳态的损伤激活未折叠蛋白反应(UPR),其提高蛋白质折叠和降解能力并减弱蛋白质合成。虽然泛素在调节错误折叠的ER-居民蛋白的降解中的作用被很好地描述,但在UPR期间泛素依赖性的翻译重编程调节仍然没有表征。使用全球定量泛素蛋白质组学,我们确定进化上保守的,位点特异性调节泛素化的40 S核糖体蛋白。我们证明,这些事件发生在组装的细胞质核糖体,并刺激UPR激活和翻译抑制。我们进一步表明,ER应激刺激的调节性40 S核糖体泛素化发生的时间尺度与eIF 2 α磷酸化相似,依赖于PERK信号传导,并且是慢性UPR激活期间最佳细胞存活所需的。总之,这些结果揭示了调节40 S核糖体泛素化作为一个以前未知的真核生物翻译控制的重要方面。
Insults to endoplasmic reticulum (ER) homeostasis activate the unfolded protein response (UPR), which elevates protein folding and degradation capacity and attenuates protein synthesis. While a role for ubiquitin in regulating the degradation of misfolded ER-resident proteins is well described, ubiquitin-dependent regulation of translational reprogramming during the UPR remains uncharacterized. Using global quantitative ubiquitin proteomics, we identify evolutionarily conserved, site-specific regulatory ubiquitylation of 40S ribosomal proteins. We demonstrate that these events occur on assembled cytoplasmic ribosomes and are stimulated by both UPR activation and translation inhibition. We further show that ER stress-stimulated regulatory 40S ribosomal ubiquitylation occurs on a timescale similar to eIF2α phosphorylation, is dependent upon PERK signaling, and is required for optimal cell survival during chronic UPR activation. In total, these results reveal regulatory 40S ribosomal ubiquitylation as a previously uncharacterized and important facet of eukaryotic translational control.
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