MOTS-c: A Mitochondrial-Derived Peptide in Metabolic Regulation and Exercise Research
Research Use Only. This article is for scientific and educational reference only. All products are sold for research purposes and are not intended for human or animal consumption.
Overview
MOTS-c (CAS 1627580-64-6), or Mitochondrial Open Reading Frame of the 12S rRNA-c, is a 16-amino acid peptide with the sequence MRWQEMGYIFYPRKLR and a molecular weight of approximately 2,174 Da. It is encoded within the 12S ribosomal RNA gene of the mitochondrial genome — making it one of a small number of peptides known to be encoded by mitochondrial DNA rather than nuclear DNA.
MOTS-c was first described by Chang et al. in 2015 in a landmark paper published in Cell Metabolism, which demonstrated that the peptide regulates glucose metabolism through AMPK activation and is capable of translocating to the nucleus in response to metabolic stress. Its discovery has expanded understanding of mitochondrial biology and the communication between mitochondria and the rest of the cell.
Mechanism of Action
MOTS-c primarily acts through activation of AMP-activated protein kinase (AMPK), a master regulator of cellular energy homeostasis. AMPK activation by MOTS-c promotes glucose uptake, fatty acid oxidation, and mitochondrial biogenesis while inhibiting anabolic processes that consume energy. This metabolic shift toward catabolism and energy production mimics aspects of the cellular response to exercise.
Research has shown that MOTS-c can translocate from mitochondria to the nucleus in response to metabolic stress, where it regulates the expression of genes involved in antioxidant defense and metabolic adaptation. This mitochondria-to-nucleus signaling represents a novel form of retrograde communication that allows mitochondria to directly influence nuclear gene expression in response to their functional state.
MOTS-c also appears to modulate the folate cycle and methionine metabolism, with downstream effects on one-carbon metabolism that influence DNA methylation and cellular redox balance.
Key Research Findings
The original 2015 study by Chang et al. demonstrated that MOTS-c administration in mice improved insulin sensitivity, reduced fat accumulation, and prevented diet-induced obesity and insulin resistance. These effects were associated with AMPK activation in skeletal muscle and were independent of changes in food intake or physical activity.
Subsequent research has shown that MOTS-c levels decline with age in both mice and humans, and that this decline is associated with reduced metabolic flexibility and increased susceptibility to age-related metabolic disorders. Studies in aged mice have demonstrated that MOTS-c administration restores aspects of youthful metabolic function, including improved glucose tolerance and increased exercise capacity.
Research has also explored MOTS-c's role in the response to exercise. Studies suggest that exercise increases circulating MOTS-c levels, and that MOTS-c may mediate some of the metabolic benefits of physical activity — leading to its characterization as a potential "exercise mimetic" peptide.
Chemical Properties
| Property | Value | |---|---| | Sequence | MRWQEMGYIFYPRKLR | | Molecular Weight | ~2,174 Da | | CAS Number | 1627580-64-6 | | Encoding | Mitochondrial 12S rRNA gene | | Form | Lyophilized powder | | Purity (research grade) | ≥99% HPLC | | Storage | −20°C, protect from light |
Research Considerations
MOTS-c is a relatively recently discovered peptide, and its full biological activity profile continues to be characterized. Research protocols should account for its AMPK-activating mechanism when designing metabolic studies. The peptide's mitochondrial origin and nuclear translocation activity make it relevant to research in mitochondrial biology, epigenetics, and aging.
Research Use Only. This article is for scientific and educational reference. All products are sold for research purposes only and are not intended for human or animal consumption.