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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biochem+Soc+Trans
2018 ; 46
(3
): 503-512
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New insights into the interplay between the translation machinery and
nonsense-mediated mRNA decay factors
#MMPMID29626148
Raimondeau E
; Bufton JC
; Schaffitzel C
Biochem Soc Trans
2018[Jun]; 46
(3
): 503-512
PMID29626148
show ga
Faulty mRNAs with a premature stop codon (PTC) are recognized and degraded by
nonsense-mediated mRNA decay (NMD). Recognition of a nonsense mRNA depends on
translation and on the presence of NMD-enhancing or the absence of NMD-inhibiting
factors in the 3'-untranslated region. Our review summarizes our current
understanding of the molecular function of the conserved NMD factors UPF3B and
UPF1, and of the anti-NMD factor Poly(A)-binding protein, and their interactions
with ribosomes translating PTC-containing mRNAs. Our recent discovery that UPF3B
interferes with human translation termination and enhances ribosome dissociation
in vitro, whereas UPF1 is inactive in these assays, suggests a re-interpretation
of previous experiments and modification of prevalent NMD models. Moreover, we
discuss recent work suggesting new functions of the key NMD factor UPF1 in
ribosome recycling, inhibition of translation re-initiation and nascent chain
ubiquitylation. These new findings suggest that the interplay of UPF proteins
with the translation machinery is more intricate than previously appreciated, and
that this interplay quality-controls the efficiency of termination, ribosome
recycling and translation re-initiation.