Global view on the metabolism of RNA poly(A) tails in yeast Saccharomyces cerevisiae

Agnieszka Tudek (), Paweł S. Krawczyk, Seweryn Mroczek, Rafał Tomecki, Matti Turtola, Katarzyna Matylla-Kulińska, Torben Heick Jensen and Andrzej Dziembowski ()
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Agnieszka Tudek: Institute of Biochemistry and Biophysics
Paweł S. Krawczyk: Institute of Biochemistry and Biophysics
Seweryn Mroczek: International Institute of Molecular and Cell Biology
Rafał Tomecki: Institute of Biochemistry and Biophysics
Matti Turtola: Aarhus University
Katarzyna Matylla-Kulińska: International Institute of Molecular and Cell Biology
Torben Heick Jensen: Aarhus University
Andrzej Dziembowski: Institute of Biochemistry and Biophysics

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract The polyadenosine tail (poly[A]-tail) is a universal modification of eukaryotic messenger RNAs (mRNAs) and non-coding RNAs (ncRNAs). In budding yeast, Pap1-synthesized mRNA poly(A) tails enhance export and translation, whereas Trf4/5-mediated polyadenylation of ncRNAs facilitates degradation by the exosome. Using direct RNA sequencing, we decipher the extent of poly(A) tail dynamics in yeast defective in all relevant exonucleases, deadenylases, and poly(A) polymerases. Predominantly ncRNA poly(A) tails are 20-60 adenosines long. Poly(A) tails of newly transcribed mRNAs are 50 adenosine long on average, with an upper limit of 200. Exonucleolysis by Trf5-assisted nuclear exosome and cytoplasmic deadenylases trim the tails to 40 adenosines on average. Surprisingly, PAN2/3 and CCR4-NOT deadenylase complexes have a large pool of non-overlapping substrates mainly defined by expression level. Finally, we demonstrate that mRNA poly(A) tail length strongly responds to growth conditions, such as heat and nutrient deprivation.

Date: 2021
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DOI: 10.1038/s41467-021-25251-w

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