Biology subjects

Schotte, C.

Publications and source records attributed to Schotte, C..

4 recordsLinked to original sources

bioRxiv2025

BAHD news from Euphorbia peplus: identification of acyltransferase enzymes involved in ingenane diterpenoid biosynthesis

O_LIThe plant family Euphorbiaceae are an abundant source of structurally complex diterpenoids, many of which have reported anti-cancer, anti-HIV, and anti-inflammatory activities. Among these, ingenol-3-angelate (1a; tradename: Picato(R)), isolated from Euphorbia peplus, has potent anti-tumour activity. C_LIO_LIHere we report the discovery and characterization of the first genes linked to the committed steps of ingenol-3-angelate (1a) biosynthesis in Euphorbia peplus. We identified two genes, the products of which catalyse the addition of angelyl-CoA (9a) to the ingenol (5) scaffold to produce ingenol-3-angelate (1a). C_LIO_LIWe demonstrate using VIGS that just one of these genes, EpBAHD-08, is essential for this angeloylation in E. peplus. VIGS of the second gene, EpBAHD-06, has a significant effect on jatrophanes rather than ingenanes in E. peplus. C_LIO_LIWe also identified three genes whose products can catalyse acetylation of ingenol-3-angelate (1a) to ingenol-3-angelate-20-acetate (2). In this case VIGS indicates considerable functional redundancy in the E. peplus genome of genes encoding this enzymatic step. C_LIO_LIThis work paves the way for increasing ingenol-3-angelate (1a) levels in planta and provides a foundation for the discovery of the remaining genes in the biosynthetic pathway of these important molecules. C_LI

biochemistry↗

bioRxiv2024

Enzymatic epimerization of monoterpene indole alkaloids in Kratom

Monoterpene indole alkaloids (MIAs) are a large, structurally diverse class of bioactive natural products. These compounds are biosynthetically derived from a stereoselective Pictet-Spengler condensation that generates a tetrahydro-{beta}-carboline scaffold characterized by a 3S stereocenter. However, a subset of MIAs contain a non-canonical 3R stereocenter. Herein, we report the basis for 3R-MIA biosynthesis in Mitragyna speciosa (Kratom). We discover the presence of the iminium species, 20S-3-dehydrocorynantheidine, which led us to hypothesize that isomerization of 3S to 3R occurs by oxidation and stereoselective reduction downstream of the initial Pictet-Spengler condensation. Isotopologue feeding experiments implicated young leaves and stems as the sites for pathway biosynthesis, facilitating the identification of an oxidase/reductase pair that catalyzes this epimerization. This enzyme pair has broad substrate specificity, suggesting that the oxidase and reductase may be responsible for the formation of many 3R-MIAs and downstream spirooxindole alkaloids in Kratom. These enzymes allow biocatalytic access to a range of previously inaccessible pharmacologically active compounds.

biochemistry↗

bioRxiv2023

Bioactive effects of natural and novel unnatural tropolone sesquiterpenoids in a murine cell model of renal interstitial fibroblasts

Fungal specialized metabolites are known for their potent biological activities, among which tropolone sesquiterpenoids (TS) stand out for their diverse bioactivities. Here, we report bioactive effects of the recently discovered TS compounds 4-hydroxyxenovulene B and 4- dihydroxy norpycnidione, and the structurally related 4-hydroxy norxenovulene B and xenovulene B. Inhibition of metabolic activity after TS treatment was observed in Jurkat, PC-3 and FAIK3-5 cells, whereas MDA-MB-231 cells were unresponsive to treatment. Structurally similar epolones were shown to induce erythropoietin (EPO). Therefore, FAIK3-5 cells, which can naturally produce EPO, were applied to test the compounds in this regard. While no effect on EPO production in FAIK3-5 cells could be demonstrated, effects on their proliferation, viability, and morphology were observed depending on the presence of tropolone moieties in the molecules. Our study underlines the importance of relevant cell models for bioactivity testing of compounds with unknown mechanisms of action.

cell biology↗

bioRxiv2022

Directed Biosynthesis of Mitragynine Stereoisomers

Mitragyna speciosa ("Kratom") is used as a natural remedy for pain and management of opioid dependence. The pharmacological properties of Kratom have been linked to a complex mixture of monoterpene indole alkaloids, most notably mitragynine. Here, we report the central biosynthetic steps responsible for the scaffold formation of mitragynine and related corynanthe-type alkaloids. We illuminate the mechanistic basis by which the key stereogenic centre of this scaffold is formed. These discoveries were leveraged for the enzymatic production of mitragynine, the C-20 epimer speciogynine, and a series of fluorinated analogues.

biochemistry↗