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• W4328114229 abstract "Ribosomal pauses are a critical part of co-translational events including protein folding and localization. However, extended ribosome pauses can lead to ribosome collisions, resulting in the activation of ribosome rescue pathways and turnover of protein and mRNA. While this relationship has been known, the specific threshold between permissible pausing versus activation of rescue pathways has not been quantified. We have taken a method used to measure elongation time and adapted it for use in S. cerevisiae to quantify the impact of elongation stalls. We find, in transcripts containing Arg CGA codon repeat-induced stalls, a Hel2-mediated dose-dependent decrease in protein expression and mRNA level and an elongation delay on the order of minutes. In transcripts that contain synonymous substitutions to non-optimal Leu codons, there is a decrease in protein and mRNA levels, as well as similar elongation delay, but this occurs through a non-Hel2-mediated mechanism. Finally, we find that Dhh1 selectively increases protein expression, mRNA level, and elongation rate. This indicates that distinct poorly translated codons in an mRNA will activate different rescue pathways despite similar elongation stall durations. Taken together, these results provide new quantitative mechanistic insight into the surveillance of translation and the roles of Hel2 and Dhh1 in mediating ribosome pausing events." @default.
• W4328114229 created "2023-03-22" @default.
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• W4328114229 date "2023-03-20" @default.
• W4328114229 modified "2023-10-17" @default.
• W4328114229 title "Quantification of elongation stalls and impact on gene expression in yeast" @default.
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• W4328114229 doi "https://doi.org/10.1101/2023.03.19.533377" @default.
• W4328114229 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36993688" @default.
• W4328114229 hasPublicationYear "2023" @default.
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