amino acid activation

a·mi·no ac·id ac·ti·va·tion

the formation of the amino acyl adenylate derivative (for example, during protein biosynthesis).
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His pioneering discoveries of the amino acid activation step of protein synthesis and also of transfer RNA were key steps in the solution of the genetic information relay from DNA to protein, leading to his election to the National Academy of Sciences and nomination, on more than one occasion, for the Nobel Prize," said Thoru Pederson, the Vitold Arnett professor in the Department of Biochemistry and Molecular Pharmacology at the University of Massachusetts Medical School.