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Purification and properties of cytochrome P-450 from homogenates of human fetal livers
Authors:M Kitada  T Kamataki  K Itahashi  T Rikihisa  R Kato  Y Kanakubo
Abstract:A form of cytochrome P-450, namely P-450HFLa of human fetal livers, was purified to a specific content of 12.6 nmol/mg protein. The cytochrome P-450 preparation was electrophoretically homogeneous and had an apparent monomeric molecular weight of 51,000 as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The cytochrome showed catalytic activities as oxidations of N-methylaniline, ethylmorphine, N,N-dimethylaniline, N,N-dimethylnitrosamine, benzphetamine, aminopyrine, aniline, p-nitroanisole, and 7-ethoxycoumarin to various extents. In fetal liver homogenate, the amount of cytochrome P-450 that reacted with the antiserum to P-450HFLa accounted for more than 36% of the total cytochrome P-450 in three different fetal livers. On the other hand, the amount of P-450HFLa was less than 5% of the total cytochrome P-450 in adult liver microsomes.
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