Abstract:
: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. Furthermore, we show that NBAS fulfills 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 coregulate 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.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Longman D,Jackson-Jones KA,Maslon MM,Murphy LC,Young RS,Stoddart JJ,Hug N,Taylor MS,Papadopoulos DK,Cáceres JFdoi
10.1101/gad.338061.120subject
Has Abstractpub_date
2020-08-01 00:00:00pages
1075-1088issue
15-16eissn
0890-9369issn
1549-5477pii
gad.338061.120journal_volume
34pub_type
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