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ABSTRACT: Enzymatic epimerization of monoterpene indole alkaloids in Kratom (mitragyna speciosa)

PROVIDER: PRJNA1244102 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR32917566_1.fastq.gz	Fastqsanger.gz
	SRR32917566_2.fastq.gz	Fastqsanger.gz
	SRR32917567_1.fastq.gz	Fastqsanger.gz
	SRR32917567_2.fastq.gz	Fastqsanger.gz
	SRR32917568_1.fastq.gz	Fastqsanger.gz

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Project description:Monoterpene indole alkaloids (MIAs) from Mitragyna speciosa (“kratom”), such as mitragynine and speciogynine, are promising novel scaffolds for opioid receptor ligands for treatment of pain, addiction, and depression. While kratom leaves have been used for centuries in South-East Asia as stimulant and pain management substance, the biosynthetic pathway of these psychoactives have only recently been partially elucidated. Here, we demonstrate the de novo production of mitragynine and speciogynine in Saccharomyces cerevisiae through the reconstruction of a five-step synthetic pathway from common MIA precursor strictosidine comprising fungal tryptamine 4-monooxygenase to bypass an unknown kratom hydroxylase. Upon optimizing cultivation conditions, a titer of ~290 µg/L kratom MIAs from glucose was achieved. Untargeted metabolomics analysis of lead production strains led to the identification of numerous shunt products derived from the activity of strictosidine synthase (STR) and dihydrocorynantheine synthase (DCS), highlighting them as candidates for enzyme engineering to further improve kratom MIAs production in yeast. Finally, by feeding fluorinated tryptamine and expressing a human tailoring enzyme, we further demonstrate production of fluorinated and hydroxylated mitragynine derivatives with potential applications in drug discovery campaigns. Altogether, this study introduces a yeast cell factory platform for the biomanufacturing of complex natural and new-to-nature kratom MIAs derivatives with therapeutic potential.

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Project description:Monoterpene indole alkaloids (MIAs) are a diverse family of complex plant secondary metabolites with many medicinal properties, including the essential anti-cancer therapeutics vinblastine and vincristine. As MIAs are difficult to chemically synthesize, the world’s supply chain for vinblastine relies on low-yielding extractions of precursors vindoline and catharanthine from the plant Catharanthus roseus, followed by chemical coupling and reduction to form vinblastine. Here, we demonstrate de novo microbial biosynthesis of vindoline and catharanthine from renewable feedstocks such as simple sugar and amino acids using highly engineered yeast. The study showcases the longest biosynthetic pathway refactored into a microbial cell factory to date, including 29 enzymatic steps from the yeast native metabolite geranyl pyrophosphate to catharanthine and vindoline. We made 44 genetic edits to yeast that include expression of 35 heterologous genes from plants as well as deletions, knock-downs, and overexpression of 10 yeast genes or variants thereof to improve the precursor supply. Finally, we demonstrate one-step in vitro vinblastine production using chemical coupling and reduction of vindoline and catharanthine. Not only is the yeast a scalable platform for production of vinblastine, it is also a platform for production of more than 2,000 different natural and new-to-nature MIAs.

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