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- W1548945793 abstract "Translation of mRNAs is the primary function of the ribosomal machinery. Although cells allow for a certain level of translational errors/mistranslation (which may well be a strategic need), maintenance of the fidelity of translation is vital for the cellular function and fitness. The P-site bound initiator tRNA selects the start codon in an mRNA and specifies the reading frame. A direct P-site binding of the initiator tRNA is a function of its special structural features, ribosomal elements, and the initiation factors. A highly conserved feature of the 3 consecutive G:C base pairs (3 GC pairs) in the anticodon stem of the initiator tRNAs is vital in directing it to the P-site. Mutations in the 3 GC pairs diminish/abolish initiation under normal physiological conditions. Using molecular genetics approaches, we have identified conditions that allow initiation with the mutant tRNAs in Escherichia coli. During our studies, we have uncovered a novel phenomenon of in vivo initiation by elongator tRNAs. Here, we recapitulate how the cellular abundance of the initiator tRNA, and nucleoside modifications in rRNA are connected with the tRNA selection in the P-site. We then discuss our recent finding of how a conserved feature in the mRNA, the Shine-Dalgarno sequence, influences tRNA selection in the P-site." @default.
- W1548945793 created "2016-06-24" @default.
- W1548945793 creator A5024382834 @default.
- W1548945793 creator A5053819735 @default.
- W1548945793 creator A5061931498 @default.
- W1548945793 date "2015-05-21" @default.
- W1548945793 modified "2023-10-17" @default.
- W1548945793 title "Is the cellular initiation of translation an exclusive property of the initiator tRNAs?" @default.
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- W1548945793 doi "https://doi.org/10.1080/15476286.2015.1043507" @default.
- W1548945793 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4615390" @default.
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