Regulation of RNA function by aminoacylation and editing?
The chemical modification of nucleic acids is a ubiquitous phenomenon. Aminoacylation of tRNAs by aminoacyl-tRNA synthetases (ARSs) is a reaction essentially devoted to protein synthesis but it is used also as an emergency mechanism to recycle stalled ribosomes, and it is required for genome replication in some RNA viruses. In several aminoacyl-tRNA synthetases a correction mechanism known as editing is present to prevent aminoacylation errors. Genome data reveal a growing number of open reading frames encoding ARS-like proteins. This strongly suggests the existence of a widespread and nonconventional machinery for aminoacylation and editing. Here we review the different biological functions of aminoacylation and editing; also we propose an evolutionary scenario for the origin of these two reactions, and hypothesize an extant role for RNA charging and editing outside the genetic code.
Geslain
Renaud
R
Catalan Institute for Research and Advanced Studies (ICREA) and Barcelona Institute for Biomedical Research, Barcelona Science Park, C/Samitier 1-5, Barcelona 08015, Catalonia, Spain.
Ribas de Pouplana
Lluís
L
D000604:Amino Acyl-tRNA Synthetases / Q000235:genetics / Q000378:metabolism; D049148:Aminoacylation; D019143:Evolution, Molecular; D005786:Gene Expression Regulation; D008957:Models, Genetic; D012313:RNA / Q000378:metabolism*; D017393:RNA Editing
D012313:RNA; D000604:Amino Acyl-tRNA Synthetases