tryptophan binding was not detectable by equilibrium dialysis for most of the mutant proteins , but this activity was measurable for several of the altered proteins by monitoring the fluorescence decrease associated with the displacement of 1-anilino-8-naphthalenesulfonate from the tryptophan-binding site ( chou , w.-y. , and matthews , k. s. ( 1989 ) j. biol . chem . 264 , 18314-18319 ) .
C1564139
mutant proteins
C0033684
proteins