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• W1990236572 abstract "Substrate has recently been shown to affect (a) the high spin content of cytochrome P450 (b) the rate of first electron transfer when LM2 (P450 2B4) and reductase were in a preformed complex, and (c) the rate of functional complex formation between NADPH-cytochrome P450 reductase and cytochrome P450 LM2. When comparing the effect of substrate on each of these parameters, the strongest correlation was demonstrated between the rate of first electron transfer through the preformed complex and the rate of functional complex formation (W.L. Backes and C.S. Eyer, 1989, J. Biol. Chem. 264, 6252-6259). The relationship among high spin content, reduction rate, and the rate of functional complex formation was examined using a number of different cytochrome P450 isozymes. The goal of this study was to determine if the previously established relationship between reduction rate and the rate of reductase-P450 complex formation was a feature only of LM2, or a general characteristic of the cytochrome P450 system. Substrate addition caused an increase in first electron transfer for each of the isozymes examined, with high spin content being increased with cytochromes P450 2B1 (PBRLM5) and P450 2B2 (PBRLM6). Substrate addition to cytochrome P450 2C6 (PBRLM4) resulted in a small decrease in high spin content. P450 2B1 and P450 2B2 showed a positive correlation between substrate-mediated stimulation of reduction and high spin content, whereas P450 2C6 showed a negative correlation between these variables. Substrate also increased the rate of reductase-P450 association for each of the isozymes examined. When compared to the degree of stimulation of reduction through a preformed complex, a strong positive correlation was obtained with each isozyme examined. These results demonstrate that the increase in both the rate of functional reductase-P450 complex formation and the rate of first electron transfer is not simply a property of LM2, but appears to be a general characteristic of many cytochrome P450 isozymes." @default.
• W1990236572 created "2016-06-24" @default.
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• W1990236572 date "1992-03-01" @default.
• W1990236572 modified "2023-10-03" @default.
• W1990236572 title "Relationship between the rate of reductase-cytochrome P450 complex formation and the rate of first electron transfer" @default.
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• W1990236572 doi "https://doi.org/10.1016/0003-9861(92)90390-i" @default.
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