Fig 1.
(A) The chemical structure of pBpa. (B) The active site of B. stearothermophilus (Bs) tyrosyl-tRNA synthetase with bound tyrosine. The homologous residues to those mutated in the library used are shown. (Bs:Y34, N123, D176, F177, and L180 correspond to Mj:Y32, E107, D158, I159, and L162). (C) The selection scheme used to isolate a p-benzoyl-L-phenylalanyl-tRNA synthetase.