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. Author manuscript; available in PMC: 2012 Sep 28.
Published in final edited form as: J Am Chem Soc. 2011 Sep 6;133(38):15139–15147. doi: 10.1021/ja2055098

Figure 1.

Figure 1

Transferase-mediated N-terminal protein modification. Top: Fully enzymatic methods use aminoacyl tRNA synthetase (aaRS), tRNA, aminoacyl transferase (AaT), amino acid, and ATP. Bottom: Chemoenzymatic methods use only a synthetic nucleic acid donor and transferase. In this work, an aminoacyl mononucleoside (Rn = H) was used.