Article
Two proofreading steps amplify the accuracy of genetic code translation.
Proceedings of the National Academy of Sciences of the United States of America - 29 Nov 2016
Ieong Ka-Weng, Uzun Ülkü, Selmer Maria, Ehrenberg Måns
Abstract excerpt
Aminoacyl-tRNAs (aa-tRNAs) are selected by the messenger RNA programmed ribosome in ternary complex with elongation factor Tu (EF-Tu) and GTP and then, again, in a proofreading step after GTP hydrolysis on EF-Tu. We use tRNA mutants with different affinities for EF-Tu to demonstrate that proofreading of aa-tRNAs occurs in two consecutive steps. First, aa-tRNAs in ternary complex with EF-Tu·GDP are selected in a...
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