A novel phosphorylation-independent interaction between SMG6 and UPF1 is essential for human NMD

Nicholson, Pamela; Josi, Christoph; Kurosawa, Hitomi; Yamashita, Akio; Mühlemann, Oliver (2014). A novel phosphorylation-independent interaction between SMG6 and UPF1 is essential for human NMD. Nucleic acids research, 42(14), pp. 9217-9235. Oxford University Press 10.1093/nar/gku645

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Eukaryotic mRNAs with premature translation-termination codons (PTCs) are recognized and eliminated by nonsense-mediated mRNA decay (NMD). NMD substrates can be degraded by different routes that all require phosphorylated UPF1 (P-UPF1) as a starting point. The endonuclease SMG6, which cleaves mRNA near the PTC, is one of the three known NMD factors thought to be recruited to nonsense mRNAs via an interaction with P-UPF1, leading to eventual mRNA degradation. By artificial tethering of SMG6 and mutants thereof to a reporter mRNA combined with knockdowns of various NMD factors, we demonstrate that besides its endonucleolytic activity, SMG6 also requires UPF1 and SMG1 to reduce reporter mRNA levels. Using in vivo and in vitro approaches, we further document that SMG6 and the unique stalk region of the UPF1 helicase domain, along with a contribution from the SQ domain, form a novel interaction and we also show that this region of the UPF1 helicase domain is critical for SMG6 function and NMD. Our results show that this interaction is required for NMD and for the capability of tethered SMG6 to degrade its bound RNA, suggesting that it contributes to the intricate regulation of UPF1 and SMG6 enzymatic activities.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Nicholson, Pamela and Mühlemann, Oliver

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

0305-1048

Publisher:

Oxford University Press

Language:

English

Submitter:

Christina Schüpbach

Date Deposited:

30 Jul 2014 16:52

Last Modified:

27 Oct 2019 03:14

Publisher DOI:

10.1093/nar/gku645

PubMed ID:

25053839

BORIS DOI:

10.7892/boris.54951

URI:

https://boris.unibe.ch/id/eprint/54951

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