Engineered E. coli Produces Gram‑Scale Gadusol Sunscreen
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- Ping Zhang led a team at Jiangnan University that inserted zebrafish genes into Escherichia coli to give the bacteria the enzymes needed to synthesize gadusol.
- The engineered E. coli used small RNA molecules and optimized growth conditions to boost gadusol output nearly 93‑fold, from 45.2 mg per L to 4.2 g per L of culture.
- Gadusol displayed antioxidant activity comparable to vitamin C in laboratory tests, suggesting it can neutralise free radicals that damage cells.
- James Gagnon of the University of Utah said gadusol is likely safe for humans and the environment because many animals already use it, and its transparency could avoid the milky residue of current sunscreens.
- Gadusol still faces two commercialization hurdles: achieving cost‑effective large‑scale manufacture (partially addressed by the new yield) and formulating a stable, long‑lasting skin‑binding solution, which may require 99 % ancillary ingredients.
Why it matters: The gram‑scale production of gadusol cuts the cost barrier that has kept natural UV protectants out of the market, opening a path for sunscreen makers to offer a transparent, biodegradable alternative while still needing formulation work to make it viable as a consumer product.
