Retrieving "Proteinogenic Amino Acid" from the archives

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1. Transfer Rna

   Linked via "proteinogenic amino acid"

   Aminoacyl-$\text{tRNA}$ Synthetases ($\text{aaRS}$)
   There are 20 canonical $\text{aaRS}$ enzymes, one for each standard proteinogenic amino acid, although exceptions exist for specialized tRNAs that decode non-standard amino acids or regulatory signals. The reaction proceeds in two steps:
   Activation: The specific amino acid is activated by ATP to form an aminoacyl-adenylate intermediate.