Leucine Protects Mitochondrial Proteins to Boost Energy — SkimNews
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- University of Cologne researchers led by Professor Thorsten Hoppe found that leucine stabilizes proteins on the outer surface of mitochondria, allowing the organelles to produce energy more efficiently.
- The effect is mediated by SEL1L, a cellular quality-control protein: leucine reduces SEL1L activity, which prevents the breakdown of outer mitochondrial membrane proteins that import molecules for energy production.
- The study, published in Nature Cell Biology, is titled "Leucine inhibits degradation of outer mitochondrial membrane proteins to adapt mitochondrial respiration."
- First author Dr. Qiaochu Li said the mechanism lets cells "swiftly adapt to increased energy demands during periods of nutrient abundance," but cautioned that SEL1L also prevents accumulation of damaged proteins essential for long-term cellular health.
- In C. elegans roundworm experiments, disrupted leucine breakdown impaired mitochondrial function and was linked to fertility problems.
- Tests on human lung cancer cells showed certain mutations in leucine metabolism helped cancer cells survive, suggesting future therapies targeting leucine pathways will need to weigh effects on healthy versus tumor cells.
- The work was funded by Germany's CECAD Cluster of Excellence, DFG Collaborative Research Centres, an ERC Advanced Grant, and the Alexander von Humboldt Foundation.
Why it matters: The finding identifies a previously unknown link between a common dietary nutrient and mitochondrial energy production, pointing to new therapeutic targets for metabolic disorders and cancer — but the SEL1L trade-off means that boosting energy via leucine risks compromising the cell's ability to clear damaged proteins over time.
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