Catalytic Mechanism of <i>S</i>-Ribosylhomocysteinase (LuxS): Direct Observation of Ketone Intermediates by <sup>13</sup>C NMR Spectroscopy
作者:Jinge Zhu、Xubo Hu、Eric Dizin、Dehua Pei
DOI:10.1021/ja0369663
日期:2003.11.1
and kinetic competence was demonstrated. The results support a catalytic mechanism in which the metal ion catalyzes an internal redox reaction, shifting the carbonyl group from the C-1 position to the C-3 position. Subsequent beta-elimination at the C-4 and C-5 positions releases homocysteine as a free thiol. The results also suggest that Cys-84 and Glu-57 are the possible general acids/bases for proton