Reference: Pernecky SJ, et al. (1990) Expression of rabbit cytochrome P-450IIE2 in yeast and stabilization of the enzyme by 4-methylpyrazole. Biochem Biophys Res Commun 172(3):1331-7

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Abstract


A rabbit cytochrome P-450IIE2 full-length cDNA was cloned into a yeast episomal plasmid (YEp13) between the copper-responsive yeast metallothionein gene promoter (CUP1) and the iso-1-cytochrome c gene terminator (CYC1), and the cytochrome P-450 was expressed in Saccharomyces cerevisiae. The microsomal fraction prepared from copper-treated cells exhibited a ferrous carbonyl difference spectrum with an absorption maximum at 451 nm and contained approximately 0.07 nmol of P-450IIE2 per mg of protein. The P-450IIE2 protein expressed in yeast microsomes was catalytically competent as judged by the NADPH-dependent deethylation of N-nitrosodiethylamine and by the oxidation of butanol. Cholate solubilization and polyethylene glycol fractionation of yeast microsomal P-450IIE2 yielded a preparation with a markedly lower specific content than that of intact microsomes, but, when 4-methylpyrazole was included during solubilization, the holoenzyme was completely stabilized.

Reference Type
Comparative Study | Journal Article | Research Support, U.S. Gov't, P.H.S.
Authors
Pernecky SJ, Porter TD, Coon MJ
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