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- W2109134027 abstract "A 22-codon upstream open reading frame (uORF2) in the human cytomegalovirus UL4 transcript leader inhibits downstream translation in cis. Previous studies revealed that the peptide product of uORF2 mediates this inhibitory effect by interfering with translation termination at its own stop codon. The block at termination results both in accumulation of the nascent uORF2 peptide linked to tRNA(Pro), the tRNA that decodes the final codon of uORF2, and in stalling of ribosomes at the end of uORF2. The stalled ribosomes create a barrier that obstructs ribosomal transit to the downstream cistron. In the current studies, we further investigated the mechanism of uORF2-mediated translational inhibition by assessing the kinetics of uORF2 peptidyl tRNA(Pro) hydrolysis and ribosomal release from the uORF2 termination site. Whereas hydrolysis of a mutant, noninhibitory uORF2 peptidyl tRNA is nearly complete in less than 1 min, hydrolysis of the wild-type peptidyl tRNA is negligible even after 30 min. In spite of this remarkably prolonged block to hydrolysis of the uORF2 peptidyl tRNA(Pro), most ribosomes are released from the uORF2 termination site within 15 min. Thus, peptidyl tRNA hydrolysis is not absolutely required for ribosomal release in this system. These results suggest that a eukaryotic cellular mechanism exists for removing stalled ribosomes from mRNAs in the absence of peptidyl tRNA hydrolysis." @default.
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- W2109134027 date "1998-02-01" @default.
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- W2109134027 title "Ribosomal release without peptidyl tRNA hydrolysis at translation termination in a eukaryotic system." @default.
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