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• W2078768180 abstract "Formation of the methylenedioxy bridge is an integral step in the biosynthesis of benzo[c]phenanthridine and protoberberine alkaloids in the Papaveraceae family of plants. This reaction in plants is catalyzed by cytochrome P450-dependent enzymes. Two cDNAs that encode cytochrome P450 enzymes belonging to the CYP719 family were identified upon interrogation of an EST dataset prepared from 2-month-old plantlets of the Mexican prickly poppy Argemone mexicana that accumulated the benzo[c]phenanthridine alkaloid sanguinarine and the protoberberine alkaloid berberine. CYP719A13 and CYP719A14 are 58% identical to each other and 77% and 60% identical, respectively, to stylopine synthase CYP719A2 of benzo[c]phenanthridine biosynthesis in Eschscholzia californica. Functional heterologous expression of CYP719A14 and CYP719A13 in Spodoptera frugiperda Sf9 cells produced recombinant enzymes that catalyzed the formation of the methylenedioxy bridge of (S)-cheilanthifoline from (S)-scoulerine and of (S)-stylopine from (S)-cheilanthifoline, respectively. Twenty-seven potential substrates were tested with each enzyme. Whereas CYP719A14 transformed only (S)-scoulerine to (S)-cheilanthifoline (K(m) 1.9±0.3; k(cat)/K(m) 1.7), CYP719A13 converted (S)-tetrahydrocolumbamine to (S)-canadine (K(m) 2.7±1.3; k(cat)/K(m) 12.8), (S)-cheilanthifoline to (S)-stylopine (K(m) 5.2±3.0; k(cat)/K(m) 2.6) and (S)-scoulerine to (S)-nandinine (K(m) 8.1±1.9; k(cat)/K(m) 0.7). These results indicate that although CYP719A14 participates in only sanguinarine biosynthesis, CYP719A13 can be involved in both sanguinarine and berberine formation in A. mexicana." @default.
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• W2078768180 date "2011-03-01" @default.
• W2078768180 modified "2023-10-02" @default.
• W2078768180 title "Characterization of two methylenedioxy bridge-forming cytochrome P450-dependent enzymes of alkaloid formation in the Mexican prickly poppy Argemone mexicana" @default.
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• W2078768180 doi "https://doi.org/10.1016/j.abb.2010.11.016" @default.
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