Oxidative Rearrangements of the Alkaloid Intermediate Geissoschizine
Mohamed O Kamileen1,2, Benke Hong1,3, Klaus Gase1
1Department of Natural Product Biosynthesis, Max Planck Institute for Chemical Ecology, D-07745, Jena, Germany.
Plants use enzymes to create diverse chemical structures from intermediates like 19E-geissoschizine. Three cytochrome P450 enzymes in Catharanthus roseus transform this intermediate into four distinct alkaloid scaffolds, showcasing enzymatic versatility.
Area of Science:
- Biochemistry
- Plant Science
- Metabolic Engineering
Background:
- Plants biosynthesize complex molecules through enzymatic pathways.
- 19E-geissoschizine is a key intermediate in the production of monoterpene indole alkaloids.
Purpose of the Study:
- To investigate the enzymatic transformations of 19E-geissoschizine.
- To identify the enzymes responsible for generating diverse alkaloid scaffolds.
Main Methods:
- In vitro enzymatic assays
- Gene silencing in Catharanthus roseus
- Mutational analysis of cytochrome P450 enzymes
Main Results:
- Three cytochrome P450 enzymes were identified that act on 19E-geissoschizine.
- These enzymes generate four distinct alkaloid scaffolds: strychnos, sarpagan, akuammiline-type, and mavacurane-type.
- Minimal active site mutations in these enzymes alter product specificity.
Conclusions:
- Enzymatic oxidative transformations of 19E-geissoschizine yield significant alkaloid structural diversity.
- Cytochrome P450 enzymes play a crucial role in plant secondary metabolism.
- Substrate reactivity and enzyme evolution synergistically drive chemical diversity in plants.
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