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Aminoacyl-tRNA synthetases are essential enzymes that help to ensure the fidelity of protein translation by accurately aminoacylating (or “charging”) specific tRNA substrates with cognate amino acids. Many synthetases have an additional catalytic activity to confer amino acid editing or proofreading. This activity relieves ambiguities during translation of the genetic code that result from one synthetase...
Transfer RNA can play a role in amino acid activation by aminoacyl-tRNA synthetases. For the prolyl-tRNA synthetase (ProRS) of Methanococcus jannaschii, which activates both proline and cysteine, the role of tRNA in amino acid selection and activation is of interest in the effort to understand the mechanism of the dual-specificity. While activation of proline does not require tRNA, whether or not...
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