Nature Podcast Botanical mystery solved: how plants make a crucial malaria drug
Mar 18, 2026
Dan Fox, science journalist who highlights recent research, and Sarah O'Connor, a Max Planck chemical ecology researcher who unraveled quinine biosynthesis. They trace the hunt for biochemical intermediates, isotope feeding tests, single-cell gene sleuthing, reconstituting the pathway in Nicotiana and making analogs. Short takes on battery durability and ancient parrot trade round out the conversation.
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Cinchona Pathway Mystery Finally Mapped
- Cinchona plants produce diverse nitrogen-containing alkaloids like quinine, but until now the biosynthetic pathway was largely unknown.
- Lombe et al. identified previously unseen intermediates, providing the chemical roadmap for enzyme discovery in the pathway.
Finding A Corner Piece Unlocked The Puzzle
- Sarah O'Connor and team stumbled across a previously unseen intermediate in Chinchona extracts that unlocked gene hunting.
- They then made isotopically labeled versions and fed them back to plants to confirm incorporation into quinine.
Cell Type Expression Tightens Gene Search
- Targeting epidermal cells narrowed candidate genes from ~40,000 because those cells synthesize the alkaloids in young leaves.
- Single-cell expression data plus sequence-based enzyme prediction focused the search efficiently.