Crystal structure of salmonella typhimurium tryptopha synthase mutant beta-Q114a with 2-({[4-(Trifluoromethoxy)phenyl]sulfonyl}amino)ethyl dihydrogen phosphate (f9f) at the alpha-Site, Cesium the metal coordination site, And [3-Hydroxy-2-Methyl-5-Phosphonooxymethyl-Pyridin-4-Yl -Serine (pls) at the beta-Site.