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Deadenylation kinetics of mixed poly(A) tails at single-nucleotide resolution

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Authors

Lee, Young-suk; Levdansky, Yevgen; Jung, Yoonseok; Kim, V. Narry; Valkov, Eugene

Issue Date
2024-05
Publisher
Nature Publishing Group
Citation
Nature Structural & Molecular Biology, Vol.31 No.5, pp.826-834
Abstract
Shortening of messenger RNA poly(A) tails, or deadenylation, is a rate-limiting step in mRNA decay and is highly regulated during gene expression. The incorporation of non-adenosines in poly(A) tails, or 'mixed tailing', has been observed in vertebrates and viruses. Here, to quantitate the effect of mixed tails, we mathematically modeled deadenylation reactions at single-nucleotide resolution using an in vitro deadenylation system reconstituted with the complete human CCR4-NOT complex. Applying this model, we assessed the disrupting impact of single guanosine, uridine or cytosine to be equivalent to approximately 6, 8 or 11 adenosines, respectively. CCR4-NOT stalls at the 0, -1 and -2 positions relative to the non-adenosine residue. CAF1 and CCR4 enzyme subunits commonly prefer adenosine but exhibit distinct sequence selectivities and stalling positions. Our study provides an analytical framework to monitor deadenylation and reveals the molecular basis of tail sequence-dependent regulation of mRNA stability. Here, using mathematical modeling and an in vitro deadenylation system, the authors quantitatively demonstrate the effect of non-adenosines in the poly(A) tail and exemplify how tail sequence regulates mRNA stability.
ISSN
1545-9993
URI
https://hdl.handle.net/10371/204205
DOI
https://doi.org/10.1038/s41594-023-01187-1
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  • College of Natural Sciences
  • School of Biological Sciences
Research Area Molecular Biology & Genetics

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