Intrinsically Unstructured Sequences in the mRNA 3' UTR Reduce the Ability of Poly(A) Tail to Enhance Translation

Autor:	Wan-Jung C. Lai, Mingyi Zhu, Margarita Belinite, Gregory Ballard, David H. Mathews, Dmitri N. Ermolenko
Rok vydání:	2022
Předmět:	RNA Caps Cell-Free System RNA Stability Saccharomyces cerevisiae Poly(A)-Binding Proteins Structural Biology Protein Biosynthesis Nucleic Acid Conformation 5' Untranslated Regions Eukaryotic Initiation Factor-4G Poly A Molecular Biology 3' Untranslated Regions Triticum
Zdroj:	Journal of molecular biology. 434(24)
ISSN:	1089-8638
Popis:	The 5' cap and 3' poly(A) tail of mRNA are known to synergistically stimulate translation initiation via the formation of the cap•eIF4E•eIF4G•PABP•poly(A) complex. Most mRNA sequences have an intrinsic propensity to fold into extensive intramolecular secondary structures that result in short end-to-end distances. The inherent compactness of mRNAs might stabilize the cap•eIF4E•eIF4G•PABP•poly(A) complex and enhance cap-poly(A) translational synergy. Here, we test this hypothesis by introducing intrinsically unstructured sequences into the 5' or 3' UTRs of model mRNAs. We found that the introduction of unstructured sequences into the 3' UTR, but not the 5' UTR, decreases mRNA translation in cell-free wheat germ and yeast extracts without affecting mRNA stability. The observed reduction in protein synthesis results from the diminished ability of the poly(A) tail to stimulate translation. These results suggest that base pair formation by the 3' UTR enhances the cap-poly(A) synergy in translation initiation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e29b02297f5fc1084d92e50265fc1e9 https://pubmed.ncbi.nlm.nih.gov/36368412 Zobrazit plný text záznamu Full Text from ScienceDirect