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- W2024151787 abstract "Deuterium isotope effects on the kinetic parameters for deamination and N-hydroxylation of cyclohexylamine (CHA) catalyzed by rabbit liver microsomes with NADPH are investigated. Both reactions are inhibited by carbon monoxide and have the characteristics of typical cytochrome P450-dependent monooxygenase reactions. A small and significant deuterium isotope effect operates in the oxidative deamination of CHA. The apparent isotope effects i.e., VHVD and (VK)H(VK ratios for deamination, are 1.75 and 1.8–2.3, respectively. On the basis of N-hydroxylation, the VHVD and VK ratios are 0.8–0.9. The N-hydroxylation rate of α-deuterated CHA (D-CHA) is somewhat higher than that of CHA. The increased increment of hydroxylamine formation seems to coincide with the decreased amount of deamination. Substitution of deuterium in the α-position of CHA results in metabolic switching of cytochrome P450 from deamination to N-hydroxylation with low deuterium isotope effects. The data are interpreted in terms of an initial one-electron abstraction from the nitrogen to form an aminium cation radical followed by recombination with iron-bound hydroxyl radical leading to N-hydroxylamine, or followed by α-carbon deprotonation to form a neutral carbon radical. The latter can lead to a carbinolamine intermediate for deamination by way of imine or recombination with nascent iron-bound hydroxyl radical. The relative rates of the reactions depend on the α-carbon deprotonation rates of amines." @default.
- W2024151787 created "2016-06-24" @default.
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- W2024151787 date "1989-04-01" @default.
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- W2024151787 title "Kinetic deuterium isotope effects on deamination and N-hydroxylation of cyclohexylamine by rabbit liver microsomes" @default.
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- W2024151787 doi "https://doi.org/10.1016/0003-9861(89)90034-9" @default.
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