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Precursors of tRNAs are stabilized by methylguanosine cap structures
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Journal Article
Precursors of tRNAs are stabilized by methylguanosine cap structures
2016
Overview
MS analysis of yeast transfer RNA precursors (pre-tRNAs) isolated at different stages of tRNA processing and maturation reveals the presence of 5′-terminal methylguanosine cap structures that protect pre-tRNA from 5′-exonucleolytic degradation.
Efficient maturation of transfer RNAs (tRNAs) is required for rapid cell growth. However, the precise timing of tRNA processing in coordination with the order of tRNA modifications has not been thoroughly elucidated. To analyze the modification status of tRNA precursors (pre-tRNAs) during maturation, we isolated pre-tRNAs at various stages from
Saccharomyces cerevisiae
and subjected them to MS analysis. We detected methylated guanosine cap structures at the 5′ termini of pre-tRNAs bearing 5′ leader sequences. These capped pre-tRNAs accumulated substantially after inhibition of RNase P activity. Upon depletion of the capping enzyme Ceg1p, the steady state level of capped pre-tRNA was markedly reduced. In addition, a population of capped pre-tRNAs accumulated in strains in which 5′ exonucleases were inhibited, indicating that the 5′ cap structures protect pre-tRNAs from 5′-exonucleolytic degradation during maturation.
Publisher
Nature Publishing Group US
Subject
/ 82/58
/ Exonucleases - antagonists & inhibitors
/ Guanosine - analogs & derivatives
/ Nucleotidyltransferases - deficiency
/ Nucleotidyltransferases - genetics
/ Ribonuclease P - antagonists & inhibitors
/ RNA Precursors - isolation & purification
/ RNA, Transfer - isolation & purification
/ Saccharomyces cerevisiae - cytology
