Journal
RNA
Volume 12, Issue 3, Pages 508-521Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1261/rna.2305406
Keywords
RNA surveillance; exosome; tRNA turnover; polyadenylation
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Funding
- NIGMS NIH HHS [R01 GM069949, GM069949-01A1] Funding Source: Medline
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1-Methyladenosine modification at position 58 of tRNA is catalyzed by a two-subunit methyltransferase composed of Trm6p and Trm61p in Saccharomyces cerevisiae. Initiator tRNA (tRNA(i)(Met)) lacking m(1)A58 (hypomethylated) is rendered unstable through the cooperative function of the poly(A) polymerases, Trf4p/Trf5p, and the nuclear exosome. We provide evidence that a catalytically active Trf4p poly(A) polymerase is required for polyadenylation of hypornethylated tRNA(i)(Met) in vivo. DNA sequence analysis of tRNA(i)(Met) cDNAs and Northern hybridizations of poly(A)+ RNA provide evidence that nascent pre-tRNA(i)(met) transcripts are targeted for polyadenylation and degradation. We determined that a mutant U6 snRNA and an aberrant form of 5S rRNA are stabilized in the absence of Trf4p, supporting that Trf4p facilitated RNA surveillance is a global process that stretches beyond hypomethylated tRNA(i)(Met). We conclude that an array of RNA polymerase I I I transcripts are targeted for Trf4p/ Trf5p-dependent polyadenylation and turnover to eliminate mutant and variant forms of normally stable RNAs.
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