title: Monooxygenase activity of Saccharomyces cerevisiae cells transformed with expression plasmids carrying rat cytochrome P-450MC cDNA.
abstract: The recombinant plasmids pAMC1 and pJMC1 were constructed; the former contained the cytochrome P-450MC (P-450MC) cDNA expression unit consisting of yeast alcohol dehydrogenase I (ADH) promoter, rat P-450MC cDNA and ADH terminator, and the Leu 2 marker gene, and the latter contained the same expression unit and the leu 2-d gene. Saccharomyces cerevisiae AH22 cells transformed with each of the recombinant plasmids were examined for plasmid copy number, P-450MC mRNA level, P-450MC content, and monooxygenase activity. The S. cerevisiae AH22/pJMC1 cells contained about 2-fold higher levels of the plasmid, P-450MC mRNA, and P-450MC than the AH22/pAMC1 cells. Monooxygenase activity towards 7-ethoxycoumarin and acetanilide of the AH22/pJMC1 cells was 1.7-fold and 1.5-fold higher than that of the AH22/pAMC1 cells, respectively, whereas the activity of the AH22/pAMC1 cells towards 7-ethoxycoumarin and acetanilide was more than 1,000-fold 10-fold higher than that of the control AH22/pAAH5 cells which contain no P-450MC cDNA, respectively. Therefore, it is likely that monooxygenase activity of the AH22 cells carrying rat P-450MC cDNA was approximately proportional to the expression level of P-450MC cDNA.
mesh_terms: D000083:Acetanilides / Q000378:metabolism; D000818:Animals; D003374:Coumarins / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System / Q000032:analysis / Q000235:genetics*; D004247:DNA / Q000032:analysis*; D006420:Hemeproteins / Q000032:analysis; D010105:Oxygenases / Q000032:analysis*; D010957:Plasmids; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics; D014170:Transformation, Genetic
chemical_list: D000083:Acetanilides; D003374:Coumarins; D006420:Hemeproteins; D012333:RNA, Messenger; C017299:7-ethoxycoumarin; D004247:DNA; D003577:Cytochrome P-450 Enzyme System; D010105:Oxygenases