MOTS-c is a 16-amino acid mitochondrial-derived peptide (MDP) encoded by the mitochondrial 12S rRNA gene. Unlike nuclear-encoded peptides, MOTS-c is produced within the mitochondria and acts as a signaling molecule that communicates mitochondrial status to the nucleus. Discovered in 2015 by Lee et al. at the University of Southern California, MOTS-c has emerged as a key player in metabolic regulation research.
Chemical Profile
| Amino Acids | 16 (MRWQEMGYIFYPRKLR) |
|---|---|
| Molecular Weight | 2,174.6 g/mol |
| Origin | Mitochondrial 12S rRNA |
| Classification | Mitochondrial-Derived Peptide (MDP) |
| Appearance | Lyophilized white powder |
| Purity (Aurex) | ≥99% (HPLC) |
Mechanism: The AMPK Pathway
MOTS-c primarily signals through the AMP-activated protein kinase (AMPK) pathway. By inhibiting the folate cycle and reducing de novo purine biosynthesis, MOTS-c increases cellular levels of AICAR — a known AMPK activator. This metabolic stress signal triggers downstream effects including enhanced glucose uptake, increased fatty acid oxidation, and improved insulin sensitivity in cellular models.
Research Applications
- AMPK pathway activation and metabolic stress response
- Exercise adaptation and endurance capacity studies
- Glucose uptake and insulin sensitivity research
- Mitochondrial-nuclear communication signaling
- Cellular senescence and aging pathway studies
- Folate cycle inhibition and purine metabolism
Exercise Research Connection
One of the most interesting areas of MOTS-c research involves its relationship with physical activity. Studies have shown that exercise induces MOTS-c production, and conversely, MOTS-c administration appears to enhance exercise capacity. This bidirectional relationship positions MOTS-c as a key molecule in understanding the cellular mechanisms behind exercise-induced metabolic improvements.