Analysis of nonstop mRNA translation in the absence of tmRNA in Escherichia coli

Kazushige Kuroha, Nobuo Horiguchi, Hiroji Aiba, Toshifumi Inada

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

tmRNA, a product of ssrA gene, plays a crucial role in the quality control system that eliminates aberrant products of nonstop mRNAs in prokaryotes. Although tmRNA recycles ribosomes stalled at the 3′ end of nonstop mRNAs, the fate of ribosomes that stall at the 3′ end in the absence of tmRNA has not been extensively examined. Here we report our analysis of the translation status of nonstop mRNAs. Polysome analysis showed that nonstop mRNAs were translated efficiently, and peptidyl-tRNA was not found in any fraction in a Δ ssrA strain. In vitro translation experiments using PURESYSTEM revealed that ribosomes translating nonstop mRNAs were dissociated from the 3′ end of mRNA, and the peptidyl-tRNA was only weakly hydrolyzed in the monosome. These results suggest that the peptidyl-tRNA of a nonstop mRNA is hydrolyzed by an unknown factor(s) in vivo, thereby allowing a nonstop mRNA to be translated as efficiently as a normal mRNA. Possible factors involved in the hydrolysis of the peptidyl-tRNAs of nonstop mRNAs are discussed.

Original languageEnglish
Pages (from-to)739-749
Number of pages11
JournalGenes to Cells
Volume14
Issue number6
DOIs
Publication statusPublished - 2009 Jun 15
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

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