Leucine stabilizes mitochondrial proteins to boost cellular energy production

October 3, 2026 at 05:52 PM2 min

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Researchers at the University of Cologne identified a mechanism by which the amino acid leucine stabilizes outer mitochondrial membrane proteins, increasing energy production. The study, published in Nature Cell Biology, shows leucine reduces activity of the quality-control protein SEL1L, preventing protein degradation. The findings suggest a potential strategy to boost cellular energy, though researchers urge caution.

Key Facts

The study was published in Nature Cell Biology under the title "Leucine inhibits degradation of outer mitochondrial membrane proteins to adapt mitochondrial respiration."
Leucine is an essential amino acid abundant in dairy products, meat, beans, and lentils.
Leucine reduces the activity of SEL1L, a protein involved in cellular quality control, leading to fewer mitochondrial proteins being broken down.
Dr. Qiaochu Li, first author of the study, stated that modulating leucine and SEL1L levels could be a strategy to boost energy production, but cautioned to proceed with care.

Leucine's Role in Mitochondrial Function

Mitochondria continuously adjust their activity based on cellular energy needs and nutrient availability. Researchers led by Professor Dr. Thorsten Hoppe at the University of Cologne identified a mechanism involving the amino acid leucine. Leucine helps stabilize important proteins in mitochondria, allowing the organelles to produce energy more efficiently. The amino acid prevents the breakdown of certain proteins located on the outer surface of mitochondria. These proteins help move other molecules into mitochondria, where they are used in the cell's energy-producing machinery.

SEL1L and Protein Quality Control

The team traced the effect to a protein called SEL1L, which is involved in cellular quality control. Cells constantly inspect their proteins because damaged or incorrectly folded proteins can interfere with normal function. SEL1L helps identify proteins that should be removed and directs them toward degradation. Leucine appears to reduce the activity of SEL1L, meaning fewer mitochondrial proteins are broken down. This allows more proteins to remain in place and support mitochondrial function.