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- W2051222242 abstract "Contrasted here are the competitive 18O/16O kinetic isotope effects (18O KIEs) on kcat/Km(O2) for three non-heme iron enzymes that activate O2 at an iron center coordinated by a 2-His-1-carboxylate facial triad: taurine dioxygenase (TauD), (S)-(2)-hydroxypropylphosphonic acid epoxidase (HppE), and 1-aminocyclopropyl-1-carboxylic acid oxidase (ACCO). Measured 18O KIEs of 1.0102 ± 0.0002 (TauD), 1.0120 ± 0.0002 (HppE), and 1.0215 ± 0.0005 (ACCO) suggest the formation in the rate-limiting step of O2 activation of an FeIII-peroxohemiketal, FeIII−OOH, and FeIV═O species, respectively. The comparison of the measured 18O KIEs with calculated or experimental 18O equilibrium isotope effects (18O EIEs) provides new insights into the O2 activation through an inner-sphere mechanism at a non-heme iron center." @default.
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- W2051222242 date "2008-06-07" @default.
- W2051222242 modified "2023-10-07" @default.
- W2051222242 title "<sup>18</sup>O Kinetic Isotope Effects in Non-Heme Iron Enzymes: Probing the Nature of Fe/O<sub>2</sub> Intermediates" @default.
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- W2051222242 doi "https://doi.org/10.1021/ja800265s" @default.
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