A cDNA encoding a human cytochrome P450 arachidonic acid epoxygenase was isolated from a human liver cDNA library. Sequence analysis revealed that this 1,876-base pair cDNA contained an open reading frame and encoded a new 502-amino acid protein designated CYP2J2. Blot hybridization analysis of RNA prepared from human tissues revealed that CYP2J2 was highly expressed in the heart. Recombinant CYP2J2 protein was prepared using the baculovirus expression system and purified to near electrophoretic homogeneity. The enzyme metabolized arachidonic acid predominantly via olefin epoxidation to all four regioisomeric cis-epoxyeicosatrienoic acids (catalytic turnover 65 pmol of product formed/nmol of cytochrome P450/min at 30 °C). Epoxidation of arachidonic acid by CYP2J2 at the 14,15-olefin was highly enantioselective for (14R,15S)-epoxyeicosatrienoic acid (76% optical purity). Immunoblotting of microsomal fractions prepared from human tissues using a polyclonal antibody raised against the recombinant hemoprotein confirmed primary expression of CYP2J2 protein in human heart. The in vivo significance of CYP2J2 was suggested by documenting the presence of epoxyeicosatrienoic acids in the human heart using gas chromatography/mass spectroscopy. Importantly, the chirality of CYP2J2 products matched that of the epoxyeicosatrienoic acid enantiomers present, in vivo, in human heart. We propose that CYP2J2 is one of the enzymes responsible for epoxidation of endogenous arachidonic acid pools in human heart and that epoxyeicosatrienoic acids may, therefore, play important functional roles in cardiac physiology.

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				W. Qu, J. A. Bradbury, C.-C. Tsao, R. Maronpot, G. J. Harry, C. E. Parker, L. S. Davis, M. D. Breyer, M. P. Waalkes, J. R. Falck, et al. Cytochrome P450 CYP2J9, a New Mouse Arachidonic Acid omega -1 Hydroxylase Predominantly Expressed in Brain J. Biol. Chem., June 29, 2001; 276(27): 25467 - 25479. [Abstract] [Full Text] [PDF]

				D. C. Zeldin Epoxygenase Pathways of Arachidonic Acid Metabolism J. Biol. Chem., September 21, 2001; 276(39): 36059 - 36062. [Full Text] [PDF]