When transfer-messenger RNA scars reveal its ancient origins

Annals of the New York Academy of Sciences
Charlotte Guyomar, R Gillet

Abstract

In bacteria, trans-translation is the primary quality control mechanism for rescuing ribosomes arrested during translation. This key process is universally conserved and plays a crucial role in the viability and virulence of all bacteria. It is performed by transfer-messenger RNA (tmRNA) and its protein partner small protein B (SmpB). Here, we show that tmRNA is a key molecule that could have given birth to modern protein synthesis. The traces of an ancient RNA world persist in the structure of modern tmRNA, suggesting its old origins. Therefore, since it has both tRNA and mRNA functions, tmRNA could be the missing link that allowed modern genetic code to be read by the ribosome.

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Citations

Jan 4, 2020·Journal of Cell Science·Shreya Ahana AyyubZofia M Chrzanowska-Lightowlers

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