7lkl
The internal aldimine form of the wild-type salmonella typhimurium tryptophan synthase in complex with inhibitor n-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (f9f) at the enzyme alpha-site, cesium ion at the metal coordination site and the product l-tryptophan at the enzyme beta-site at 1.05 angstrom resolution. one of the beta-q114 rotamer conformations allows a hydrogen bond to form with the plp oxygen at the position 3 in the ring
