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• W2172095534 startingPage "1084" @default.
• W2172095534 abstract "Our previous demonstration that mutants of 5S rRNA called mof9 can specifically alter efficiencies of programmed ribosomal frameshifting (PRF) suggested a role for this ubiquitous molecule in the maintenance of translational reading frame, though the repetitive nature of the 5S rDNA gene (>100 copies/cell) inhibited more detailed analyses. However, given the known interactions between 5S rRNA and ribosomal protein L5 (previously called L1 or YL3) encoded by an essential, single-copy gene, we monitored the effects of a series of well-defined rpl5 mutants on PRF and virus propagation. Consistent with the mof9 results, we find that the rpl5 mutants promoted increased frameshifting efficiencies in both the −1 and +1 directions, and conferred defects in the ability of cells to propagate two endogenous viruses. Biochemical analyses demonstrated that mutant ribosomes had decreased affinities for peptidyl-tRNA. Pharmacological studies showed that sparsomycin, a peptidyltransferase inhibitor that specifically increases the binding of peptidyl-tRNA with ribosomes, was antagonistic to the frameshifting defects of the most severe mutant, and the extent of sparsomycin resistance correlated with the severity of the frameshifting defects in all of the mutants. These results provide biochemical and physiological evidence that one function of L5 is to anchor peptidyl-tRNA to the P-site. A model is presented describing how decreased affinity of ribosomes for peptidyl-tRNA can affect both −1 and +1 frameshifting, and for the effects of sparsomycin." @default.
• W2172095534 created "2016-06-24" @default.
• W2172095534 creator A5065393739 @default.
• W2172095534 creator A5066267623 @default.
• W2172095534 date "2001-08-01" @default.
• W2172095534 modified "2023-10-11" @default.
• W2172095534 title "Ribosomal protein L5 helps anchor peptidyl-tRNA to the P-site in Saccharomyces cerevisiae" @default.
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• W2172095534 doi "https://doi.org/10.1017/s1355838201001480" @default.
• W2172095534 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1307509" @default.
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• W2172095534 hasPublicationYear "2001" @default.
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