tmRNA is essential in Shigella flexneri

Nonstop mRNAs pose a challenge for bacteria, because translation cannot terminate efficiently without a stop codon. The trans-translation pathway resolves nonstop translation complexes by removing the nonstop mRNA, the incomplete protein, and the stalled ribosome. P1 co-transduction experiments demo...

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Veröffentlicht in:PloS one 2013-02, Vol.8 (2), p.e57537-e57537
Hauptverfasser: Ramadoss, Nitya S, Zhou, Xin, Keiler, Kenneth C
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Zhou, Xin
Keiler, Kenneth C
description Nonstop mRNAs pose a challenge for bacteria, because translation cannot terminate efficiently without a stop codon. The trans-translation pathway resolves nonstop translation complexes by removing the nonstop mRNA, the incomplete protein, and the stalled ribosome. P1 co-transduction experiments demonstrated that tmRNA, a key component of the trans-translation pathway, is essential for viability in Shigella flexneri. tmRNA was previously shown to be dispensable in the closely related species Escherichia coli, because E. coli contains a backup system for trans-translation mediated by the alternative release factor ArfA. Genome sequence analysis showed that S. flexneri does not have a gene encoding ArfA. E. coli ArfA could suppress the requirement for tmRNA in S. flexneri, indicating that tmRNA is essential in S. flexneri because there is no functional backup system. These data suggest that resolution of nonstop translation complexes is required for most bacteria.
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subjects Bacteria
Bacterial Proteins - biosynthesis
Bacterial Proteins - genetics
Biochemistry
Biology
Cloning
Codon, Terminator
Codons
Deoxyribonucleic acid
DNA
E coli
Escherichia coli
Escherichia coli - genetics
Escherichia coli - metabolism
Genes
Genetic engineering
Genomes
Genomics
Laboratories
Medicine
Messenger RNA
Molecular biology
mRNA
Nucleotide sequence
Polypeptides
Protein Biosynthesis
Proteins
RNA, Bacterial - genetics
Shigella
Shigella flexneri - genetics
Shigella flexneri - metabolism
Stop codon
TmRNA
Translation
Viability
title tmRNA is essential in Shigella flexneri
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