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To shed light on the mechanism of isotopic exchange ofa-protons in amino acids catalyzed by pyridoxal phosphate(PLP)-dependent enzymes, we studied the kinetics ofquinonoid intermediate formation for the reactions oftyrosine phenol-lyase with L-phenylalanine, L-methionine,and theira-deuterated analogues inD2O, andwe comparedthe results with the rates of the isotopic exchange under thesame conditions.Wehave found that, in theL-phenylalaninereaction, the internal returnof thea-proton is operative, andallowing for its effect, the exchange rate is accounted forsatisfactorily....
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Báo cáo khoa học: The mechanism of a-proton isotope exchange in amino acids catalysed by tyrosine phenol-lyase
