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- W1485368483 abstract "Abstract Cytochrome P-450 is known to catalyze the following oxygen transfer reaction: RH + PhIO----ROH + PhI where RH represents a variety of hydroxylatable substrates and PhIO a variety of iodosobenzene derivatives that serve as oxygen donors, and neither molecular oxygen nor an external electron donor is required. To determine whether the cytochrome functions in such reactions by a peroxidase-type mechanism, the kinetics of its interaction with a variety of substituted iodosobenzenes and iodobenzene diacetates have been determined by stopped flow spectrophotometry. The reaction of phenobarbital-induced rabbit liver microsomal cytochrome P-450 form 2 with iodosobenzenes or iodobenzene diacetates leads to the reversible formation of three spectral intermediates, termed E, F, and G. Complex E is characterized by a type I difference spectrum, representing the iodosobenzene-dependent partial shift of the low spin hexacoordinate form of the ferric enzyme to the high spin pentacoordinate form, F represents a transient intermediate whose spectrum cannot be determined for kinetic reasons, and G represents a blue-shifted intermediate with an absorption maximum at about 393 nm in the absolute spectrum. The striking and principal feature of these observations is that the spectrum of Complex G does not vary with structural differences in the iodosobenzene derivatives, in contrast to the transient species observed in previous studies in this laboratory in the reaction between cytochrome P-450 form 2 and aromatic peroxy compounds. Complex G exhibits the spectral properties one might anticipate for an iron-oxo intermediate containing only one oxygen atom derived from the starting iodosobenzene." @default.
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- W1485368483 date "1989-03-01" @default.
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- W1485368483 title "On the Mechanism of Action of Cytochrome P-450" @default.
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- W1485368483 doi "https://doi.org/10.1016/s0021-9258(19)84907-4" @default.
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