Identification of a Nonsense-Mediated Decay pathway at the Endoplasmic Reticulum

Identification of a Nonsense-Mediated Decay pathway at the Endoplasmic Reticulum
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内质网无义介导的衰变途径的鉴定

DOI:
10.1101/2020.02.24.954453
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发表时间:
2020
期刊:
--
影响因子:
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通讯作者:
Longman D
Longman D
中科院分区:
--
文献类型:
--
作者:
Longman D

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无义介导的衰变(NMD)是发生在细胞质中的一种依赖翻译的RNA质量控制机制。然而,目前尚不清楚NMD如何调节内质网(ER)翻译的rna的稳定性。在这里,我们确定了一个专门用于er翻译mrna的局部NMD途径。我们之前发现NBAS是一种新的NMD因子,它是Syntaxin 18复合体的一个组成部分,参与高尔基到内质网的运输。在这里,我们证明了NBAS在NMD中具有独立的功能。这种ER-NMD通路需要NBAS与核心NMD因子UPF1的相互作用,UPF1部分位于转座子附近的ER。NBAS和UPF1共同调节er相关转录本的稳定性,特别是那些与细胞应激反应相关的转录本。我们提出了一个模型,其中NBAS将UPF1招募到内质网膜并激活内质网专用的NMD通路,从而通过确保内质网翻译mrna的质量控制来提供内质网保护功能。图形摘要:thighlightsnbas是一种定位于内质网(ER)膜上的NMD因子。NBAS在高尔基向内质网逆行运输和ER- nmdnbas将核心NMD因子UPF1招募到ER-NMD膜上,ER-NMD通路以内质网翻译的降解mrna为靶标
Nonsense-mediated decay (NMD) is a translation-dependent RNA quality control mechanism that occurs in the cytoplasm. However, it is unknown how NMD regulates the stability of RNAs translated at the Endoplasmic Reticulum (ER). Here, we identify a localized NMD pathway dedicated to ER-translated mRNAs. We previously identified NBAS, a component of the Syntaxin 18 complex involved in Golgi-to-ER trafficking, as a novel NMD factor. Here, we show that NBAS fulfils an independent function in NMD. This ER-NMD pathway requires the interaction of NBAS with the core NMD factor UPF1, which is partially localized at the ER in the proximity of the translocon. NBAS and UPF1 co-regulate the stability of ER-associated transcripts, in particular those associated with the cellular stress response. We propose a model where NBAS recruits UPF1 to the membrane of the ER and activates an ER-dedicated NMD pathway, thus providing an ER protective function by ensuring quality control of ER-translated mRNAs.Graphical AbstractHIGHLIGHTSNBAS is an NMD factor that localizes to the membrane of the endoplasmic reticulum (ER)NBAS has dual, independent, roles in Golgi-to-ER retrograde transport and in ER-NMDNBAS recruits the core NMD factor UPF1 to the membrane of the ERThe ER-NMD pathway targets for degradation mRNAs that are translated at the ER
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