Dual Catalytic Activity of a Cytochrome P450 Controls Bifurcation at a Metabolic Branch Point of Alkaloid Biosynthesis in Rauwolfia serpentina.

Dual Catalytic Activity of a Cytochrome P450 Controls Bifurcation at a Metabolic Branch Point of Alkaloid Biosynthesis in Rauwolfia serpentina.
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DOI:
10.1002/anie.201705010
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发表时间:
2017-08-01
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
O'Connor SE
O'Connor SE
中科院分区:
其他
文献类型:
--
作者:
Dang TT;Franke J;Tatsis E;O'Connor SE

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Plants create tremendous chemical diversity from a single biosynthetic intermediate. In plant‐derived ajmalan alkaloid pathways, the biosynthetic intermediate vomilenine can be transformed into the anti‐arrhythmic compound ajmaline, or alternatively, can isomerize to form perakine, an alkaloid with a structurally distinct scaffold. Here we report the discovery and characterization of vinorine hydroxylase, a cytochrome P450 enzyme that hydroxylates vinorine to form vomilenine, which was found to exist as a mixture of rapidly interconverting epimers. Surprisingly, this cytochrome P450 also catalyzes the non‐oxidative isomerization of the ajmaline precursor vomilenine to perakine. This unusual dual catalytic activity of vinorine hydroxylase thereby provides a control mechanism for the bifurcation of these alkaloid pathway branches. This discovery highlights the unusual catalytic functionality that has evolved in plant pathways.
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