کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1996589 | 1065491 | 2012 | 12 صفحه PDF | دانلود رایگان |
SummaryTranslation arrest leads to an endonucleolytic cleavage of mRNA that is termed no-go decay (NGD). It has been reported that the Dom34:Hbs1 complex stimulates this endonucleolytic cleavage of mRNA induced by translation arrest in vivo and dissociates subunits of a stalled ribosome in vitro. Here we report that Dom34:Hbs1 dissociates the subunits of a ribosome that is stalled at the 3′ end of mRNA in vivo, and has a crucial role in both NGD and nonstop decay. Dom34:Hbs1-mediated dissociation of a ribosome that is stalled at the 3′ end of mRNA is required for degradation of a 5′-NGD intermediate. Dom34:Hbs1 facilitates the decay of nonstop mRNAs from the 3′ end by exosomes and is required for the complete degradation of nonstop mRNA decay intermediates. We propose that Dom34:Hbs1 stimulates degradation of the 5′-NGD intermediate and of nonstop mRNA by dissociating the ribosome that is stalled at the 3′ end of the mRNA.
Graphical AbstractFigure optionsDownload high-quality image (88 K)Download as PowerPoint slideHighlights
► Dom34:Hbs1 dissociates subunits of ribosome stalled at the 3′ end of mRNA in vivo
► Dom34:Hbs1 facilitates the decay of nonstop mRNA and 5′-NGD intermediate by exosome
► Ribosomes stalled at the 3′ end of mRNA induce sequential endonucleolytic cleavages
► Carboxy-terminal region of Ski7 and Dom34:Hbs1 play independent roles in NSD
Journal: - Volume 46, Issue 4, 25 May 2012, Pages 518–529