Hyperprocessing of tRNA by the catalytic RNA of RNase P: Cleavage of a natural tRNA within the mature tRNA sequence and evidence for an altered conformation of the substrate tRNA

Yo Kikuchi, Noriko Sasaki

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

In the transposon copia-related retrovirus-like particles of Drosophila, a 39-nucleotide-long fragment from the 5′-region of Drosophila initiator methionine tRNA (tRNAi Met) is used as the primer for copia minusstrand reverse transcription. This primer tRNAi Met fragment is thought to be produced by cleavage within the mature tRNAi Met sequence. We call this cleavage hyperprocessing. We have previously reported that catalytic RNA of RNase P from Escherichia coli (MlRNA) cleaves the synthetic tRNAi Met precursor in vitro at several sites within the mature tRNA sequence. Based on this result, we proposed a model for formation of the primer tRNA fragment involving RNase P. Here we show that natural tRNAi Met prepared from DrosophUa adult flies can be cleaved by MIRNA. Using mutant tRNAi Met substrates, we also show that these cleavages are dependent on the occurrence of an altered conformation of the tRNA substrate. This is evidence that a tRNA can exist in aqueous solution at least in part in an altered conformation.

Original languageEnglish
Pages (from-to)11972-11976
Number of pages5
JournalJournal of Biological Chemistry
Volume267
Issue number17
Publication statusPublished - 1992 Jun 15
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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