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From Proteopedia
Crystal structure of leucyl-tRNA synthetase and tRNA (leucine) complex
Aminoacyl-tRNA synthetases are ligases which exclusively attach a particular amino acid to the 3’ of its set of cognate tRNAs isoacceptors. It is a two-step reaction: First, an activated intermediate called aminoacyladenylate is synthesized from the amino acid and ATP. Then, the activated amino acid is transferred to the 3’-end of the tRNA. It leads to the formation of the aminoacyl-tRNA. The fidelity of protein synthesis depends of the accuracy of this reaction.
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