... representatives of the two groups of amino acid inhibitors mentioned above. The interaction of L-phenylalanine,L-methionine, andtheir a-deuterated analogs with TPL in D2O was charac-terized by the ... withL-methio-nine the rate of abstraction of the a-proton, leading toformation of the quinonoid intermediate, is less by a factor of 2.5 t han f or the r eaction w ithL-phenylalanine. The observed ... obtain pure a-deuteratedL-Phe. The procedure for preparation of a-deuteratedL-Met was the same, except initially 0.7 gL-Met was dissolved in 15 mLD2O, and the time of incubation was 80...