title: High-level expression of functional human cytochrome P450 1A2 in Escherichia coli.
abstract: Enzymatically active human cytochrome P450 1A2 was expressed in Escherichia coli utilizing the pCWori+ vector containing a modified cDNA. The coding sequence for the NH2-terminal region of the protein was modified by the alignment and substitution of a 27 bp segment from a modified bovine P450 17A1 cDNA onto the 5' end of the open reading frame of P450 1A2 at amino acid 21. The expressed chimeric P450 was produced at a high level in a functionally intact form, as assayed by the formation in vivo of the 449 nm absorbance band of the CO complex of the reduced hemoprotein. E. coli membrane preparations were shown to contain P450 1A2, which was active in the 2-hydroxylation of estradiol, and the O-deethylation of 7-ethoxycoumarin and 7-ethoxyresorufin, when reconstituted with recombinant rat liver NADPH-cytochrome P450 reductase.
authors.affiliation: Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas.
authors.forename: C W
authors.initials: CW
authors.lastname: Fisher
authors.forename: D L
authors.initials: DL
authors.lastname: Caudle
authors.forename: C
authors.initials: C
authors.lastname: Martin-Wixtrom
authors.forename: L C
authors.initials: LC
authors.lastname: Quattrochi
authors.forename: R H
authors.initials: RH
authors.lastname: Tukey
authors.forename: M R
authors.initials: MR
authors.lastname: Waterman
authors.forename: R W
authors.initials: RW
authors.lastname: Estabrook
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002462:Cell Membrane / Q000201:enzymology; D003001:Cloning, Molecular / Q000379:methods; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D015723:Gene Library; D006801:Humans; D007700:Kinetics; D008099:Liver / Q000201:enzymology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010957:Plasmids; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid
chemical_list: D011994:Recombinant Proteins; D003577:Cytochrome P-450 Enzyme System