Single-Cell-Based Screening and Engineering of <scp>d</scp>-Amino Acid Amidohydrolases Using Artificial Amidophenol Substrates and Microbial Biosensors
Enantiomerically pure d-amino acids are important intermediates as chiral building blocks for peptidomimetics and semisynthetic antibiotics. Here, a transcriptionalfactor-based screening strategy was used for the rapid screening of d-stereospecific amino acid amidase via an enzyme-specific amidophenol substrate. We used a d-threonine amidophenyl derivative to produce 2-aminophenol that serves as a