CDNA-DIRECTED EXPRESSION OF HUMAN CYTOCHROME-P450 CYP3A4 USING BACULOVIRUS

CDNA-DIRECTED EXPRESSION OF HUMAN CYTOCHROME-P450 CYP3A4 USING BACULOVIRUS

Buters J T M; Korzekwa K R; Kunze K L; Omata Y; Hardwick J P; Gonzalez F J

Drug Metabolism and Disposition

1994

1994-09

A recombinant baculovirus containing the human CYP3A4 cDNA was constructed and used to express CYP3A4 in SF9 insect cells (0.46 +/- 0.13 nmol/mg protein, 103 +/- 29 nmol/liter, N = 15). The enzyme represented similar to 2-3% of total cellular protein and could be purified by a two column procedure to a specific content of 12.7 nmol/mg protein. Catalytic activity of the purified enzyme after reconstitution was optimum using molar ratios of CYP3A4 to cytochrome b(5) to NADPH-P450 oxidoreductase of 1:3:20, respectively. The enzyme metabolized cortisol, erythromycin, testosterone, and (R)-warfarin. Recombinant baculovirus expresses the highest amounts of all expression systems published to date of catalytically intact CYP3A4. This system is an excellent alternative for the isolation and characterization of P450 forms from human liver.

pharmacokinetics; Pharmacology & Pharmacy; metabolism; polymorphism; identification; reductase; oxidation; vaccinia virus; human-liver; catalytic activities; hydroxylation

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Journal Article or Conference Abstract Publication

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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

688-692

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