... the action of aminoferase. Biokhimia 12, 556–568 (in Russian).2. Esaki, N., Nakayuma, T., Sawada, S., Tanaka, H. & Soda, K.(1985) Proton NMR studies of substrate hydrogen exchangereactions ... mechanism of a- proton isotope exchange in amino acids catalysedby tyrosine phenol-lyase1What is the role of quinonoid intermediates?Nicolai G. Faleev1, Tatyana V. Demidkina2, Marina A. ... definesautomatically the positions of the a- proton and the sidechain of any bound amino ac id. The lability of the a- protonobserved for a large number of amino acids [5] under theaction of TPL...