The RNA helicase DHX34 activates NMD by promoting a transition from the surveillance to the decay-inducing complex.

Abstract:

:Nonsense-mediated decay (NMD) is a surveillance mechanism that degrades aberrant mRNAs. A complex comprising SMG1, UPF1, and the translation termination factors eRF1 and eRF3 (SURF) is assembled in the vicinity of a premature termination codon. Subsequently, an interaction with UPF2, UPF3b, and the exon junction complex induces the formation of the decay-inducing complex (DECID) and triggers NMD. We previously identified the RNA helicase DHX34 as an NMD factor in C. elegans and in vertebrates. Here, we investigate the mechanism by which DHX34 activates NMD in human cells. We show that DHX34 is recruited to the SURF complex via its preferential interaction with hypophosphorylated UPF1. A series of molecular transitions induced by DHX34 include enhanced recruitment of UPF2, increased UPF1 phosphorylation, and dissociation of eRF3 from UPF1. Thus, DHX34 promotes mRNP remodeling and triggers the conversion from the SURF complex to the DECID complex resulting in NMD activation.

journal_name

Cell Rep

journal_title

Cell reports

authors

Hug N,Cáceres JF

doi

10.1016/j.celrep.2014.08.020

subject

Has Abstract

pub_date

2014-09-25 00:00:00

pages

1845-1856

issue

6

issn

2211-1247

pii

S2211-1247(14)00683-4

journal_volume

8

pub_type

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