Figure 1.
A) The trans forms of the photoswitchable click amino acids. PSCaa 1: 2-amino-3-(4-((3-vinylphenyl)diazenyl)phenyl)propanoic acid; Keto-PSCaa 2: 2-amino-3-(4-((3-(2-acetyl)phenyl)diazenyl)phenyl)propanoic acid; Cl-PSCaa 3: 2-amino-3-(4-((3-(chloromethyl)phenyl)diazenyl)phenyl)propanoic acid. B) X-ray crystal structure of the active site cavity of the MmOmePylRS (PDB 3QTC), in which the structure of PSCaa 1 (cyan) was superimposed. Residues mutated in the synthetase library are shown in yellow stick.