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Maf1-mediated regulation of yeast RNA polymerase III is correlated with CCA addition at the 3′ end of tRNA precursors

Foretek, Dominika and Nuc, Przemysław and Żywicki, Marek and Karlowski, Wojciech M. and Kudla, Grzegorz and Boguta, Magdalena (2016) Maf1-mediated regulation of yeast RNA polymerase III is correlated with CCA addition at the 3′ end of tRNA precursors. Gene . ISSN 0378-1119 (In Press)


Official URL: http://www.sciencedirect.com/science/article/pii/S...


In eukaryotic cells tRNA synthesis is negatively regulated by the protein Maf1, conserved from yeast to humans. Maf1 from yeast Saccharomyces cerevisiae mediates repression of trna transcription when cells are transferred from medium with glucose to medium with glycerol, a non-fermentable carbon source. The strain with deleted gene encoding Maf1 (maf1Δ) is viable but accumulates tRNA precursors. In this study tRNA precursors were analysed by RNA-Seq and Northern hybridization in wild type strain and maf1Δ mutant grown in glucose medium or upon shift to repressive conditions. A negative effect of maf1Δ mutant on the addition of the auxiliary CCA nucleotides to the 3′ end of pre-tRNAs was observed in cells shifted to unfavourable growth conditions. This effectwas reduced by overexpression of the yeast CCA1 gene encoding ATP(CTP):tRNA nucleotidyltransferase. The CCA sequence at the 3′ end is important for export of tRNA precursors from the nucleus and essential for tRNA charging with amino acids. Data presented here indicate that CCA-addition to intron-containing end-processed tRNA precursors is a limiting step in tRNA maturation when there is no Maf1 mediated RNA polymerase III (Pol III) repression. The correlation between CCA synthesis and Pol III regulation by Maf1 could be important in coordination of tRNA transcription, processing and regulation of translation.

Item Type:Article
Subjects:Q Science > QH Natural history
Q Science > QH Natural history > QH301 Biology
Divisions:Department of Genetics
ID Code:1234
Deposited By: profesor Magdalena Boguta
Deposited On:15 Nov 2016 11:23
Last Modified:08 Mar 2018 15:34

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