7xs4

Structural highlights

Function

URT1_ARATH UTP:RNA uridylyltransferase with a marked preference for uridine polymerization and a distributive activity for the first added nucleotides (PubMed:23748567, PubMed:25928405). Uridylates oligo(A)-tailed mRNAs to prevent 3' to 5' ribonucleotytic attacks (PubMed:23748567). Can prevent the 3' trimming of mRNAs still engaged on polysomes (PubMed:23748567). Acts synergistically with HESO1 in unmethylated miRNA uridylation, leading to their degradation (PubMed:25928341). URT1 and HESO1 prefer substrates with different 3' end nucleotides and act cooperatively to tail different forms of the same miRNAs (PubMed:25928405). URT1 and HESO1 act sequentially, with URT1 mono-uridylating the miRNAs followed by their further uridylation by HESO1 (PubMed:25928405). Has no effect on uridylation of heterochromatic siRNAs (PubMed:25928341). Able to act on AGO1-bound miRNAs and the uridylated species stay associated with AGO1 (PubMed:25928405).^{[1] [2] [3]}

References

1. ↑ Sement FM, Ferrier E, Zuber H, Merret R, Alioua M, Deragon JM, Bousquet-Antonelli C, Lange H, Gagliardi D. Uridylation prevents 3' trimming of oligoadenylated mRNAs. Nucleic Acids Res. 2013 Aug;41(14):7115-27. doi: 10.1093/nar/gkt465. Epub 2013, Jun 6. PMID:23748567 doi:http://dx.doi.org/10.1093/nar/gkt465
2. ↑ Wang X, Zhang S, Dou Y, Zhang C, Chen X, Yu B, Ren G. Synergistic and independent actions of multiple terminal nucleotidyl transferases in the 3' tailing of small RNAs in Arabidopsis. PLoS Genet. 2015 Apr 30;11(4):e1005091. doi: 10.1371/journal.pgen.1005091., eCollection 2015 Apr. PMID:25928341 doi:http://dx.doi.org/10.1371/journal.pgen.1005091
3. ↑ Tu B, Liu L, Xu C, Zhai J, Li S, Lopez MA, Zhao Y, Yu Y, Ramachandran V, Ren G, Yu B, Li S, Meyers BC, Mo B, Chen X. Distinct and cooperative activities of HESO1 and URT1 nucleotidyl transferases in microRNA turnover in Arabidopsis. PLoS Genet. 2015 Apr 30;11(4):e1005119. doi: 10.1371/journal.pgen.1005119., eCollection 2015 Apr. PMID:25928405 doi:http://dx.doi.org/10.1371/journal.pgen.1005119