Introduction
MOTS-c peptide is a small signaling molecule built from instructions stored inside mitochondria, the tiny power plants found in nearly every cell. That alone makes it unusual. Most hormones and peptides are coded by DNA in the cell nucleus, but MOTS-c comes from the mitochondria’s own separate genome.
Since its discovery in 2015, MOTS-c has become one of the most studied mitochondrial-derived peptides in metabolic science. Researchers are investigating how it affects glucose use, fat metabolism, exercise capacity and age-related decline in cell and animal models.
This guide explains what MOTS-c is, how its structure is built, how it works inside cells and what current research shows. For a quick snapshot of the compound and its specifications, visit our MOTS-c research overview.
What Is MOTS-c Peptide?
MOTS-c stands for “mitochondrial open reading frame of the 12S rRNA type-c.” It is a mitochondrial-derived peptide (MDP), one of a group of short peptides encoded by small reading frames hidden inside mitochondrial DNA.
Scientists at the University of Southern California, led by Changhan David Lee and Pinchas Cohen, first described MOTS-c in Cell Metabolism in 2015. They showed the peptide circulates in the blood and acts mainly on skeletal muscle. That is why it is often called a “mitohormone”: a messenger sent from the mitochondria to the rest of the body.
MOTS-c belongs to a small family of MDPs:
- Humanin, encoded in the 16S rRNA region and studied for cell-protective effects
- Small humanin-like peptides (SHLP1–6), also from the 16S rRNA region
- MOTS-c, the best-characterized MDP from the 12S rRNA region
This discovery changed an old view of mitochondria. Their DNA was thought to code only 13 proteins, 22 tRNAs and 2 rRNAs. MOTS-c showed that mitochondria also send active signals, not just make energy.
The Structure of MOTS-c
MOTS-c is a short chain of 16 amino acids with the sequence MRWQEMGYIFYPRKLR. Its key properties are below.
| Property | Detail |
|---|---|
| Length | 16 amino acids |
| Sequence | Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg |
| Molecular formula | C101H152N28O22S2 |
| Molecular weight | About 2,174.6 Da |
| Genetic origin | 12S rRNA gene in mitochondrial DNA |
| Research form | Lyophilized (freeze-dried) powder |
The sequence is highly conserved across mammals, which suggests it plays an important biological role. Its tail end is rich in positively charged arginine and lysine residues. Researchers believe this helps the peptide move into the cell nucleus during metabolic stress.
Mitochondria read genes with a slightly different genetic code than the nucleus. The original study suggested MOTS-c may be translated in the cytoplasm using the standard code, a question still under investigation.
For laboratory-grade material produced to this sequence, see our MOTS-c 10mg research vial.
How MOTS-c Works: Function and Mechanism
MOTS-c works mainly by switching on AMPK, the cell’s master energy sensor. Research points to a clear chain of events:
- Folate cycle slows down. MOTS-c inhibits the folate cycle and the linked pathway that builds purines.
- AICAR builds up. This causes AICAR, a natural metabolic intermediate, to accumulate inside the cell.
- AMPK turns on. AICAR activates AMP-activated protein kinase (AMPK).
- Metabolism shifts. AMPK increases glucose uptake into muscle, supports fat burning and encourages new mitochondria to form.
A simple way to picture it: AMPK is the cell’s fuel gauge. When MOTS-c raises AICAR, the gauge reads “low,” so the cell takes in more glucose and burns more fuel. This looks a lot like what happens during exercise.
MOTS-c Travels to the Nucleus
A 2018 study in Cell Metabolism found that under metabolic stress, MOTS-c moves from the cytoplasm into the nucleus. This move depends on AMPK. Inside the nucleus, MOTS-c works with transcription factors such as NRF2 to regulate genes linked to antioxidant defense.
This finding matters because it shows a two-way conversation. The nucleus has always controlled mitochondria; MOTS-c shows mitochondria can talk back and influence nuclear gene expression.
What Research Says About MOTS-c
Most MOTS-c findings come from cell and animal studies, with a few human observational studies. MOTS-c is an investigational compound and is not approved for any therapeutic use.
Insulin Sensitivity and Glucose Metabolism
In the original 2015 study, MOTS-c improved insulin sensitivity in mice and prevented insulin resistance caused by a high-fat diet. Skeletal muscle appeared to be its main target tissue.
Diet-Induced Obesity Models
The same research found MOTS-c helped prevent diet-related weight gain in mice. Treated animals showed better glucose clearance and greater use of fatty acids for energy.
Exercise and Physical Capacity
A 2021 study in Nature Communications reported that exercise raised MOTS-c levels in human skeletal muscle and blood. In mice, MOTS-c treatment improved physical performance in young, middle-aged and old animals. For this reason, researchers often describe it as an “exercise mimetic.”
Aging and Metabolic Decline
Some studies report that circulating MOTS-c levels fall with age. Scientists are exploring whether this drop contributes to age-related metabolic decline. In the 2021 study, treatment started late in life still improved physical capacity in old mice.
Human Genetic Studies
A natural variant called m.1382A>C changes one amino acid in MOTS-c (lysine 14 to glutamine, K14Q). In Japanese populations, this variant has been linked to higher type 2 diabetes risk in men. Lab tests showed the variant peptide was less active, supporting MOTS-c’s role in glucose control.
Want more peptide science? Browse the latest articles on our research blog.
Handling MOTS-c in the Laboratory
Reliable results start with verified, well-stored material. Peptides can degrade quickly when exposed to heat, moisture or light.
- Verify purity. Confirm identity and purity with HPLC and mass spectrometry, and request a lot-specific Certificate of Analysis. Every batch of our research-grade MOTS-c ships with third-party test data.
- Store correctly. Keep lyophilized vials at 2–8°C for short-term use and at −20°C for storage beyond three months, protected from light.
- Ship cold. Temperature control in transit protects peptide stability. Our shipping policy explains how orders are packed and delivered.
- Follow compliance rules. MOTS-c is sold strictly for laboratory research. Review our terms and conditions before ordering.
Frequently Asked Questions
Is MOTS-c a hormone?
Not in the classic sense, but it behaves like one. It is made in cells, released into the blood and acts on distant tissues, which is why researchers call it a mitohormone.
How is MOTS-c different from humanin?
Both are mitochondrial-derived peptides. Humanin comes from the 16S rRNA region and is mainly studied for cell protection. MOTS-c comes from the 12S rRNA region and is mainly studied for metabolism.
Is MOTS-c approved for human use?
No. MOTS-c is an investigational peptide. Products on this site are for laboratory and in vitro research only.
Conclusion
MOTS-c is a 16-amino-acid peptide coded by mitochondrial DNA that acts as a metabolic messenger. It activates AMPK, can enter the nucleus under stress and has shown effects on insulin sensitivity, fat metabolism and physical capacity in preclinical models. These findings make it one of the most interesting molecules in mitochondrial and aging research.
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