Scientists unlock unusual fatty acid pathway to boost bio-based oil production

Plants have always been better chemists than we gave them credit for. Some species, through millions of years of evolution, developed the ability to manufacture fatty acids that most plants cannot—molecules with unusual chain lengths and reactive chemical groups that make them valuable for industrial use. A team of researchers at the Center for Advanced Bioenergy and Bioproducts Innovation set out to understand how one plant in particular pulls off this trick, and in doing so, they've opened a new door for engineering crops to produce high-value oils on demand.

The plant in question is Orychophragmus limprichtianus, a relatively obscure species whose seeds contain fatty acids unlike anything found in conventional oilseeds. Using a combination of chromatography, mass spectrometry, and molecular analysis, the researchers identified these lipids as C24 to C28 keto-hydroxy fatty acids—molecules with 24 to 28 carbons in their backbone and reactive chemical groups that make them useful for everything from lubricants to specialty chemicals. The discovery raised an obvious question: how does the plant make them?

The answer involved two enzymes working in concert. The first, called fatty acid elongase 1 (FAE1), extends the carbon chain beyond the typical length. The second, 3-ketoacyl-CoA reductase (KCR1), modifies the chain by introducing the keto and hydroxy groups that give these fatty acids their distinctive properties. What struck the researchers was that this combination of enzymatic steps resembled something usually found in bacteria—a type of assembly-line chemistry called polyketide synthesis. The plant had essentially borrowed a bacterial strategy and integrated it into its own lipid-making machinery.

To prove they understood the pathway, the team did something ambitious: they took the genes encoding these two enzymes and inserted them into an engineered oilseed crop. The goal was to see whether the pathway would work in a different plant species, in a controlled agricultural context. It did. The engineered plants produced the same unusual fatty acids, demonstrating that the system could be transplanted and scaled up.

This matters because it expands what synthetic biology can do. For decades, plant engineers have focused on tweaking the fatty acids that plants naturally make—trying to shift the balance between saturated and unsaturated oils, or to increase yield. This work shows that you can introduce entirely new biosynthetic pathways, ones that nature has already invented but that exist in only a handful of species. The unusual fatty acids produced by this pathway have immediate industrial applications: they make excellent lubricants, and they can serve as building blocks for other chemicals that currently rely on petroleum. More broadly, the research reveals that plant lipid metabolism is far more flexible than previously understood—that the evolutionary boundaries between different types of fatty acid chemistry are more porous than anyone expected.

The implications ripple outward. If this pathway can be engineered into oilseeds, what other plant-based chemical factories might be waiting to be discovered and transplanted? The work suggests a future in which crops are designed not just to feed people but to manufacture the specialty chemicals that modern industry depends on, all from renewable biological sources. For now, the researchers have proven the concept works. The next phase will be scaling it up—moving from laboratory validation to field trials, and eventually to the kind of agricultural production that could actually displace petroleum-based lubricants in the marketplace.