Scientists crack the yew tree's cancer-drug recipe for lab brewing
Shan F, Yu J, Yang J, Wang S
Medicinal Plants
The Pacific yew hedges planted in shady yards grow so slowly that harvesting their bark for medicine has historically meant stripping wild trees bare, and this research points toward a future where that pressure disappears entirely.
Paclitaxel is a powerful cancer drug that originally came from the bark of yew trees, but yew trees grow slowly and making the drug by hand in a lab is expensive and wasteful. Researchers have now figured out almost every step of the chemical pathway the tree uses to build this molecule, including some tricky enzyme steps that had puzzled scientists for years. With the full recipe in hand, they're now trying to transplant it into yeast, bacteria, algae, and other fast-growing organisms so the drug can be brewed in tanks instead of harvested from forests.
Key Findings
Near-complete elucidation of the paclitaxel biosynthetic pathway in Taxus (yew) species, including newly discovered cytochrome P450 and 2-oxoglutarate/Fe(II)-dependent dioxygenase enzymes responsible for taxane core oxidation and oxetane ring formation.
Heterologous reconstruction efforts in E. coli, S. cerevisiae, and plant-based systems face bottlenecks including low P450 catalytic efficiency, metabolic burden on host cells, and cytotoxicity of the final product.
Emerging strategies to scale production include AI-driven enzyme engineering, oleaginous yeast chassis, synthetic microbial consortia, and photosynthetic microalgae platforms.
chevron_right Technical Summary
Scientists have nearly fully mapped the complex biological recipe that yew trees use to make paclitaxel (Taxol), a critical cancer drug, opening the door to brewing it sustainably in engineered yeast, bacteria, or algae instead of stripping it from slow-growing trees.
Abstract Preview
Original paper
Sustainable biomanufacturing of paclitaxel: From pathway elucidation to green production systems.
Paclitaxel remains irreplaceable in cancer therapy, yet its supply is critically constrained by the ecological unsustainability of plant extraction and the prohibitive costs of chemical synthesis. ...
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