Structural evolution of Glycyl-tRNA synthetases alpha subunit and its implication in the initial organization of the decoding system

Progress in Biophysics and Molecular Biology
Savio Torres de FariasMarco V José

Abstract

The origin and evolution of the genetic code is a fundamental challenge in modern biology. At the center of this problem is the correct interaction between amino acids and tRNAs. Aminoacyl-tRNA synthetase is the enzyme responsible for the correct binding between amino acids and tRNAs. Among the 20 canonical amino acid, glycine was the most abundant in prebiotic condition and it must have been one of the first to be incorporated into the genetic code. In this work, we derive the ancestral sequence of Glycyl-tRNA synthetase (GlyRS) and predict its 3D-structure. We show, via molecular docking experiments, the capacity of ancestral GlyRS to bind the tRNA anticodon stem loop, cofactors and substrates. These bindings exhibit high affinity and specificity. We propose that the primordial function of these interactions was to stabilize both compounds to make possible the catalysis. In this context, the anticodon stem loop did contribute to the encoding system and just with the emergence of the mRNA it was co-opted for codification. Thus, we present a model for the origin of the genetic code in which the operational and the anticodon codes did not evolve independently.

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Citations

Mar 8, 2019·BMC Bioinformatics·Paweł BłaŻejPaweł Mackiewicz
Mar 25, 2021·Journal of Molecular Evolution·Savio Torres de FariasMarco V José
Sep 11, 2021·Journal of Molecular Evolution·Pedro Henrique Lopes Ferreira DantasSávio Torres de Farias

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