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- W1606396095 abstract "Hepatic mitoplasts from 3-methylcholanthrene-treated rats contain cytochrome P-450 which can metabolize polycyclic aromatic hydrocarbons like benzo(a)pyrene. Mitochondrial cytochrome P-450 was partially purified and reconstituted in vitro using adrenodoxin and the adrenodoxin reductase electron transfer system and [3H]benzo(a)pyrene as the substrate. A polyclonal antibody to purified microsomal P-450c (a major 3-methylcholanthrene-inducible form) inhibited the activity of mitochondrial enzyme in a concentration-dependent manner and also reacted with a 54-kDa protein on the immunoblots. A monoclonal antibody having exclusive specificity for P-450c, on the other hand, did not inhibit the aryl hydrocarbon hydroxylase activity of the mitochondrial enzyme and showed no detectable cross-reaction with the 54-kDa mitochondrial protein. Similarly, two-dimensional analysis and immunodetection using the polyclonal antibody showed distinct molecular properties of the mitochondrial enzyme different from the similarly induced microsomal P-450c with respect to the isoelectric pH. In vitro translation of free polysomes from 3-methylcholanthrene-induced liver, transport of precursor proteins by isolated mitochondria in vitro, and immunoprecipitation with the polyclonal antibody showed the presence of a 57-kDa putative precursor which is transported and processed into mature 54-kDa species. These results present evidence for the true intramitochondrial location of the P-450c-antibody reactive isoform detected in 3-methylcholanthrene-induced rat liver mitochondria." @default.
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- W1606396095 date "1988-01-01" @default.
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- W1606396095 title "Hepatic mitochondrial cytochrome P-450 system. Identification and characterization of a precursor form of mitochondrial cytochrome P-450 induced by 3-methylcholanthrene." @default.
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- W1606396095 doi "https://doi.org/10.1016/s0021-9258(19)57430-0" @default.
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