H-Phe(4-Ac)-OH is a keto-containing amino acid, which can be conversed from α-keto acids containing acetyl. H-Phe(4-Ac)-OH can be incorporated at the amber position to afford the mutant Z domain protein[1][2][3].
[1]. Tang H, et al. Recent Technologies for Genetic Code Expansion and their Implications on Synthetic Biology Applications. J Mol Biol. 2022 Apr 30;434(8):167382.
[2]. Volkwein W, et al. A Versatile Toolbox for the Control of Protein Levels Using Nε-Acetyl-l-lysine Dependent Amber Suppression. ACS Synth Biol. 2017 Oct 20;6(10):1892-1902.
[3]. Liu H, Wang L, Brock A, Wong CH, Schultz PG. A method for the generation of glycoprotein mimetics. J Am Chem Soc. 2003 Feb 19;125(7):1702-3.