7kbn
1.60 angstrom resolution crystal structure of the beta-q114a mutant of tryptophan synthase in complex with n-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (f9f) at the enzyme alpha-site, cesium ion at the metal coordination site, and 2-aminophenol quinonoid at the enzyme beta site
