Mitochondria are often described as the powerhouses of the cell because they produce much of the energy our bodies need to grow, move, repair tissues, and carry out everyday functions. But they do not operate at a constant pace. Instead, mitochondria continuously adjust their activity depending on how much energy a cell needs and which nutrients are available.
Scientists have long known that nutrition can influence this process. What has been less clear is exactly how individual nutrients send signals that change mitochondrial activity. Now, researchers led by Professor Dr.
Thorsten Hoppe of the Institute for Genetics and the CECAD Cluster of Excellence on Aging Research at the University of Cologne have identified a new mechanism involving the amino acid leucine. Their findings show that leucine can help stabilize important proteins in mitochondria, allowing the organelles to produce energy more efficiently. The study, published in Nature Cell Biology, is titled "Leucine inhibits degradation of outer mitochondrial membrane proteins to adapt mitochondrial respiration." How Leucine Helps Mitochondria Produce Energy Leucine is an essential amino acid, which means the human body cannot make enough of it on its own and must obtain it through food.
Amino acids are the building blocks used to make proteins, and leucine is especially abundant in protein rich foods such as dairy products, meat, beans, and lentils. The researchers found that leucine does more than contribute to protein production. It also helps prevent the breakdown of certain proteins located on the outer surface of mitochondria.
Those proteins play an important role in metabolism because they help move other molecules into mitochondria, where they can be used as part of the cell's energy producing machinery. When leucine helps preserve these proteins, mitochondria can operate more effectively and increase the amount of energy the cell produces. "We were thrilled to discover that a cell's nutrient status, especially its leucine levels, directly impacts energy production," said Dr.
Qiaochu Li, first author of the study. "This mechanism enables cells to swiftly adapt to increased energy demands during periods of nutrient abundance." A Cellular Quality Control Protein Plays a Key Role The team traced this 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.
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