Mol Cell. 2005 Feb 4;17(3):405-16.

Ribosome stalling regulates IRES-mediated translation in eukaryotes, a parallel to prokaryotic attenuation.

Fernandez J, Yaman I, Huang C, Liu H, Lopez AB, Komar AA, Caprara MG, Merrick WC, Snider MD, Kaufman RJ, Lamers WH, Hatzoglou M.

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Departments of Nutrition, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.

Abstract

It was previously shown that the mRNA for the cat-1 Arg/Lys transporter is translated from an internal ribosome entry site (IRES) that is regulated by cellular stress. Amino acid starvation stimulated cat-1 translation via a mechanism that requires translation of an ORF in the mRNA leader and remodeling of the leader to form an active IRES (the "zipper model" of translational control). It is shown here that slowing of the leader peptide elongation rate, either by cycloheximide or the introduction of rare codons, stimulated translation of the downstream ORF. These results suggest that ribosome stalling in the upstream ORF causes mRNA remodeling and formation of an active IRES. This control is reminiscent of translation attenuation in prokaryotic operons, where inhibition of translation elongation can regulate both mRNA translation and gene transcription by altering mRNA structure.

PMID:: 15694341; [PubMed - indexed for MEDLINE]

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