Shown are the complexes with (A) benzene, (B) toluene, (C) phenol, (D) 2-mercaptoethanol (PDB ID 4E97( 37 )), (E) 1,2-benzisoxazole (PDB ID 4EKS( 37 )), (F) nitrobenzene (PDB ID 4EKP( 37 )), (G) 4-nit... ophenol (PDB ID 4EKQ( 37 )), (H) 2-hydroxy benzonitrile (PDB ID 4EKR( 37 )), (I)) 2-allyl phenol, (J) 1-phenyl-2-propyn-1-ol, (K) 2-amino-5-chloro thiazole, (L) 4-bromoimidazole, (M) 4-trifluoromethyl imidazole, (N) 2-(pyrazolo-1-yl) ethanol, (O) 3-trifluoromethyl-5-methyl pyrazole, (P) 2-bromo-5-hydroxybenzaldehyde.
Intermediate to these are the more polar T4 lysozyme cavities L99A/M102Q (PDB 1LI2), which adds a polar glutamine residue to the cavity and L99A/M102E† (PDB 3GUN( 55 )), which adds a neutral glutamic acid, and L99A/M102H† (PDB 4EKQ( 37 )), the focus of this study, which adds a histidine residue to the cavity.