Ribosome stalling and peptidyl-tRNA drop-off during translational delay at AGA codons.

Abstract:

:Minigenes encoding the peptide Met-Arg-Arg have been used to study the mechanism of toxicity of AGA codons proximal to the start codon or prior to the termination codon in bacteria. The codon sequences of the 'mini-ORFs' employed were initiator, combinations of AGA and CGA, and terminator. Both, AGA and CGA are low-usage Arg codons in ORFs of Escherichia coli but, whilst AGA is translated by the scarce tRNA(Arg4), CGA is recognized by the abundant tRNA(Arg2). Overexpression of minigenes harbouring AGA in the third position, next to a termination codon, was deleterious to the cell and led to the accumulation of peptidyl-tRNA(Arg4) and of the peptidyl-tRNA cognate to the preceding CGA or AGA Arg triplet. The minigenes carrying CGA in the third position were not toxic. Minigene-mediated toxicity and peptidyl-tRNA accumulation were suppressed by overproduction of tRNA(Arg4) but not by overproduction of peptidyl-tRNA hydrolase, an enzyme that is only active on substrates that have been released from the ribosome. Consistent with these findings, peptidyl-tRNA(Arg4) was identified to be mainly associated with ribosomes in a stand-by complex. These and previous results support the hypothesis that the primary mechanism of inhibition of protein synthesis by AGA triplets in pth+ cells involves sequestration of tRNAs as peptidyl-tRNA on the stalled ribosome.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Cruz-Vera LR,Magos-Castro MA,Zamora-Romo E,Guarneros G

doi

10.1093/nar/gkh784

keywords:

subject

Has Abstract

pub_date

2004-08-18 00:00:00

pages

4462-8

issue

15

eissn

0305-1048

issn

1362-4962

pii

32/15/4462

journal_volume

32

pub_type

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