Aminoacyl-tRNA synthetases and the evolution of coded peptide synthesis: the Thioester World.

Hieronim Jakubowski

FEBS letters 2016 Feb

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Coded peptide synthesis must have been preceded by a prebiotic stage, in which thioesters played key roles. Fossils of the Thioester World are found in extant aminoacyl-tRNA synthetases (AARSs). Indeed, studies of the editing function reveal that AARSs have a thiol-binding site in their catalytic modules. The thiol-binding site confers the ability to catalyze aminoacyl~coenzyme A thioester synthesis and peptide bond formation. Genomic comparisons show that AARSs are structurally related to proteins involved in sulfur and coenzyme A metabolisms and peptide bond synthesis. These findings point to the origin of the amino acid activation and peptide bond synthesis functions in the Thioester World and suggest that the present-day AARSs had originated from ancestral forms that were involved in noncoded thioester-dependent peptide synthesis. © 2016 Federation of European Biochemical Societies.

Citation

Hieronim Jakubowski. Aminoacyl-tRNA synthetases and the evolution of coded peptide synthesis: the Thioester World. FEBS letters. 2016 Feb;590(4):469-81