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Distinct and Cooperative Activities of HESO1 and URT1 Nucleotidyl Transferases in MicroRNA Turnover in

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The tailing of RNAs with non-templated uridines, known as uridylation, is often associated with RNA degradation. We previously identified HESO1 as a nucleotidyl transferase that uridylates microRNAs (miRNAs) to lead to their degradation in Arabidopsis. But HESO1 cannot account for all the miRNA uridylation activity in vivo. Here, we have uncovered UTP:RNA URIDYLYLTRANSFERASE 1 (URT1) as another nucleotidyl transferase that uridylates miRNAs. HESO1 and URT1 have different substrate preferences and act cooperatively to tail miRNAs. We show that both enzymes are able to act on ARGONAUTE1 (AGO1)-bound miRNAs and that the tailed miRNAs stay bound by AGO1. We show that URT1-mediated tailing affects the activities of miR165/6 and miR171a differently. This study reveals intricate miRNA uridylation processes as well as functional outcomes of miRNA uridylation.

Vyšlo v časopise: Distinct and Cooperative Activities of HESO1 and URT1 Nucleotidyl Transferases in MicroRNA Turnover in. PLoS Genet 11(4): e32767. doi:10.1371/journal.pgen.1005119
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1005119

Souhrn

The tailing of RNAs with non-templated uridines, known as uridylation, is often associated with RNA degradation. We previously identified HESO1 as a nucleotidyl transferase that uridylates microRNAs (miRNAs) to lead to their degradation in Arabidopsis. But HESO1 cannot account for all the miRNA uridylation activity in vivo. Here, we have uncovered UTP:RNA URIDYLYLTRANSFERASE 1 (URT1) as another nucleotidyl transferase that uridylates miRNAs. HESO1 and URT1 have different substrate preferences and act cooperatively to tail miRNAs. We show that both enzymes are able to act on ARGONAUTE1 (AGO1)-bound miRNAs and that the tailed miRNAs stay bound by AGO1. We show that URT1-mediated tailing affects the activities of miR165/6 and miR171a differently. This study reveals intricate miRNA uridylation processes as well as functional outcomes of miRNA uridylation.

Zdroje

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