TRNA 3′ processing in yeast involves tRNase Z, Rex1, and Rrp6

Ewa Skowronek, Pawel Grzechnik, Bettina Späth, Anita Marchfelder, Joanna Kufel

Research output: Contribution to journalArticlepeer-review


Mature tRNA 3′ ends in the yeast Saccharomyces cerevisiae are generated by two pathways: endonucleolytic and exonucleolytic. Although two exonucleases, Rex1 and Rrp6, have been shown to be responsible for the exonucleolytic trimming, the identity of the endonuclease has been inferred from other systems but not confirmed in vivo. Here, we show that the yeast tRNA 3′ endonuclease tRNase Z, Trz1, is catalyzing endonucleolytic tRNA 3′ processing. The majority of analyzed tRNAs utilize both pathways, with a preference for the endonucleolytic one. However, 3′-end processing of precursors with long 3′ trailers depends to a greater extent on Trz1. In addition to its function in the nucleus, Trz1 processes the 3′ ends of mitochondrial tRNAs, contributing to the general RNA metabolism in this organelle.

Original languageEnglish
Pages (from-to)115-130
Number of pages16
Issue number1
Publication statusPublished - Jan 2014


  • 3′-end processing
  • Exonucleases
  • Saccharomyces cerevisiae
  • TRNA
  • TRNase Z


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