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- W1566991372 abstract "Previous studies suggested that rabbit liver microsomes contain cytochrome P-450 monooxygenase(s) with low affinity for (omega-1)-hydroxylation and high affinity for omega-hydroxylation of prostaglandins (Theoharides, A. D., and Kupfer, D. (1981) J. Biol. Chem. 256, 2168-2175). The current investigation describes the isolation from livers of untreated rabbits of a cytochrome P-450 catalyzing, with regioselectivity, the omega-hydroxylation of prostaglandins E1 and E2. The isolation of the enzyme involved enrichment of the omega-hydroxylase activity by polyethylene glycol 8000 fractionation, followed by ion-exchange high performance liquid chromatography. Based on Mr of 59,000-60,000 from sodium dodecyl sulfate-polyacrylamide gel electrophoresis, the isolated enzyme is referred to as P-450 form 7. This P-450 exhibits a low spin spectrum (lambda max = 417 nm) and a difference spectrum of the CO-reduced complex versus reduced (lambda max = 451 nm). For catalytic activity, the P-450 form 7 was reconstituted with NADPH-P-450 reductase, cytochrome b5, and lipid. There was no activity in the absence of the reductase, and deletion of cytochrome b5 yielded a minimal amount of product (heme could not substitute for cytochrome b5), demonstrating an absolute requirement for these components." @default.
- W1566991372 created "2016-06-24" @default.
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- W1566991372 date "1985-02-01" @default.
- W1566991372 modified "2023-09-30" @default.
- W1566991372 title "Isolation by ion-exchange high performance liquid chromatography of rabbit liver cytochrome P-450 with regioselectivity for omega-hydroxylation of prostaglandins." @default.
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- W1566991372 doi "https://doi.org/10.1016/s0021-9258(18)89509-6" @default.
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