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Is the cellular initiation of translation an exclusive property of the initiator tRNAs?

Shetty, Sunil and Bhattacharyya, Souvik and Varshney, Umesh (2015) Is the cellular initiation of translation an exclusive property of the initiator tRNAs? In: RNA BIOLOGY, 12 (7). pp. 675-680.

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Official URL: http://dx.doi.org/10.1080/15476286.2015.1043507


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 (3GC pairs) in the anticodon stem of the initiator tRNAs is vital in directing it to the P-site. Mutations in the 3GC 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.

Item Type: Editorials/Short Communications
Publication: RNA BIOLOGY
Additional Information: Copy right for this article belongs to the TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
Keywords: anti-Shine-Dalgarno; aSD; initiation with elongator tRNAs; proteome diversity/plasticity; ribosomal heterogeneity; Shine-Dalgarno; SD; 3GC base pairs; 70S initiation
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 24 Sep 2015 06:28
Last Modified: 22 Oct 2018 09:38
URI: http://eprints.iisc.ac.in/id/eprint/52407

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