... N.N. & Braunstein, A. E. (1947)Labilization of a- hydrogen of amino acids under the action of aminoferase. Biokhimia 12, 556–568 (in Russian).2. Esaki, N., Nakayuma, T., Sawada, S., Tanaka, ... The anchoring of a- carboxylateand a- amino group in the external aldimine definesautomatically the positions of the a- proton and the sidechain of any bound amino ac id. The lability of the a- protonobserved ... value of a wasassumedtobeequaltozero(Table2).According to X-ray data [15,16] the abstraction of the a- proton is most probably effected by the e-amino group of lysine 257, which f orms the aldimine...