Scientists Discover a New Way Omega-3 Fats Chemically Tag Proteins
Researchers identified a brand-new type of protein modification, which they named “lysine C-iminylation.” This occurs when a small molecule called propionaldehyde attaches to lysine, one of the building blocks of proteins.
Using specialized lab techniques involving stable isotope labeling, the team traced the origin of this molecule back to omega-3 fatty acids. Specifically, they found that enzymes called cytochrome P450 (CYP) break down omega-3 fats and produce byproducts that can attach to proteins in this newly described way.
The modification was found in mouse tissue and appeared on proteins involved in important metabolic pathways. Notably, levels of this modification were higher in a mutant strain used to study aging, a condition associated with increased CYP enzyme activity.
What this means for you
This is basic laboratory science that expands our understanding of how omega-3 fats are processed in the body and how their breakdown products can chemically interact with proteins. It doesn’t tell us anything yet about supplement effects or health outcomes, but it opens a new area of research into how omega-3 metabolism might influence protein function and aging-related biology.
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Proceedings of the National Academy of Sciences of the United States of America · 2026-09-08 · DOI: 10.1073/pnas.2525618123
Read the original source ↗This summary is for educational purposes only and is not medical advice. Always talk to your healthcare provider before making changes to your supplement routine.