Quick answer: MOTS-c is a 16-amino-acid peptide encoded in the mitochondrial genome. It was first described in 2015 and is studied in preclinical models as a mitochondrial-derived signaling peptide, with published work focused on AMPK-linked pathways and stress-responsive gene regulation. It is sold for laboratory research use only.
Why MOTS-c gets so many searches
If you have come across "MOTS-c" on a forum, a supplier page or a research summary, the name itself is not self-explanatory. The unusual part of the story is where this molecule comes from, and that origin explains most of the scientific interest in it.
This article is a plain-language explainer for researchers and curious readers. It describes what the peptide is, where it was discovered, how it is described in the preclinical literature, and what to look for in a research-grade supply. It does not make claims about use in people, and nothing here is guidance for human or animal administration.
What the name means
MOTS-c is an abbreviation of mitochondrial open reading frame of the twelve S rRNA type-c. Each piece of that phrase carries information. "Mitochondrial" tells you the genetic source is the mitochondrial genome, the small circular DNA found inside mitochondria rather than the larger nuclear genome. "Open reading frame" means a stretch of sequence that can be read as a protein-coding message. "12S rRNA" identifies the host gene, a ribosomal RNA gene in mitochondrial DNA. The letter "c" is a label for the particular reading frame.
The surprise is that a region once thought to only produce structural RNA also contains a short coding sequence. MOTS-c is one of a small family of such peptides, grouped together as mitochondrial-derived peptides.
Basic structure
The reported sequence is MRWQEMGYIFYPRKLR, sixteen amino acids written in single-letter code. For comparison, BPC-157 has fifteen residues and many hormone-like peptides are between 10 and 40. At this size the molecule is synthesized routinely by solid-phase peptide synthesis, which is how research material is produced.
The sequence contains basic residues (arginine and lysine) as well as aromatic ones (tryptophan, tyrosine and phenylalanine). Aromatic residues absorb ultraviolet light, which is convenient because it makes the peptide easy to detect during HPLC analysis. Methionine near the start is also worth noting, because methionine can oxidize during storage, and oxidation products show up as extra peaks on a chromatogram. The full chemistry is covered in MOTS-c chemical structure and synthesis.
Discovery and history
MOTS-c was reported in 2015 by a research group at the University of Southern California studying mitochondrial-encoded small peptides. Their report described the peptide, linked it to metabolic signaling in cell and rodent models, and helped establish the idea that mitochondria send signals to the rest of the cell through peptides, not only through metabolites and reactive species. A later study from the same field described a stress-dependent relocation of the peptide to the nucleus.
The background is told in more detail in MOTS-c discovery and history. If you want the mitochondrial-derived peptide family compared side by side, see MOTS-c versus other mitochondrial-derived peptides.
How the literature describes its mechanism
Three themes recur in preclinical papers.
The first is AMP-activated protein kinase, or AMPK, a cellular energy sensor. Published cell and animal work associates MOTS-c exposure with changes in AMPK activity and in related folate and one-carbon metabolism. The second is nuclear translocation: under metabolic stress, labelled peptide has been reported to move into the nucleus and interact with transcriptional regulators, giving a route by which a mitochondrial product could influence nuclear genes. The third is stress adaptation more broadly, with studies examining how the peptide responds to nutrient stress and exercise in model systems.
These are descriptions of what has been observed in experimental systems, and the findings are an active research area rather than settled science. Most data come from cell lines and rodents, and conclusions do not automatically carry across species. For a structured walk-through, see MOTS-c mechanism of action and MOTS-c preclinical research.
Quick reference
| Property | Detail |
|---|---|
| Length | 16 amino acids |
| Reported sequence | MRWQEMGYIFYPRKLR |
| Genetic origin | Open reading frame in mitochondrial 12S rRNA gene |
| Peptide class | Mitochondrial-derived peptide |
| First described | 2015 |
| Frequently discussed pathways | AMPK signaling, nuclear gene regulation under stress |
| Research status | Preclinical; laboratory research use only |
Common mix-ups
MOTS-c and Humanin. Both are mitochondrial-derived, but they come from different genes and have different lengths. MOTS-c and NAD. NAD is a small-molecule coenzyme, not a peptide, and it is studied in different assays. MOTS-c and growth-hormone secretagogues. Those act on a pituitary receptor pathway, unrelated to the mitochondrial origin discussed here.
If you are comparing NAD with other metabolism-related research compounds, NAD mechanism of action is the best starting point.
What to look for in a research-grade supply
Because MOTS-c contains methionine and aromatic residues, quality questions are practical ones: how much of the peak is the target, whether oxidized variants are present, and whether the lot is traceable. A useful certificate shows the HPLC chromatogram with a lot number that matches the vial, plus identity data and contaminant screening where available. The V8 articles on MOTS-c purity testing and understanding HPLC purity explain how to read those reports, and where to buy MOTS-c gives a supplier checklist.
V8 Peptides posts the certificates it holds on its certificate of analysis page. These cover HPLC purity and identity by HPLC, endotoxin by LAL and PCR sterility, and exist for only a subset of the catalog, so check whether the specific product has one before relying on it.
Storage and handling in general terms
Lyophilized peptides are typically kept cold, dry and away from light, and exposure to repeated temperature swings or humidity is avoided. Oxidation-prone residues such as methionine are a reason to limit air exposure. The details are in MOTS-c reconstitution and storage.
The MOTS-c research product is listed at MOTS-c. It is supplied strictly for laboratory research use; it is not a drug, food or cosmetic and is not intended for human or animal use. The broader MOTS-c research FAQ answers further questions.
Why researchers pair it with analytical rigor
Small mitochondrial peptides are an area where careless sourcing can undermine an experiment. Because the biological readouts in this field, such as kinase phosphorylation or changes in transcript levels, are sensitive to small shifts in conditions, a contaminated or partly oxidized preparation can create signals that have nothing to do with the intended molecule. Endotoxin is the usual culprit in cell work, and truncated synthesis products are the usual culprit in dose-response style comparisons.
For that reason, groups working with MOTS-c typically record the lot, keep the original report with the notebook entry, store aliquots to avoid repeated handling, and run a vehicle-only control alongside every experiment. None of that is specific to this peptide, but it is especially valuable here because the published effects are subtle and the field is still young. Reading the original 2015 and 2018 papers, listed below, before designing a study is the best way to understand the models and readouts that earlier groups used. It also helps to note which cell types, culture conditions and time points each paper reported, since results from one system should not be assumed to hold in another.
Frequently asked questions
What is MOTS-c in one sentence?
MOTS-c is a 16-amino-acid peptide encoded within the mitochondrial genome, studied in preclinical research as a signaling molecule that links mitochondria to the rest of the cell.
What does MOTS-c stand for?
It stands for mitochondrial open reading frame of the 12S rRNA type-c.
How is MOTS-c different from most peptides?
Nearly all known peptides are encoded in the nuclear genome. MOTS-c comes from a short open reading frame inside a mitochondrial ribosomal RNA gene, which is why it belongs to the class called mitochondrial-derived peptides.
What is the amino acid sequence?
The commonly reported sequence is MRWQEMGYIFYPRKLR, sixteen residues in single-letter code.
Which pathways are discussed in the literature?
Published preclinical work discusses AMPK-related signaling and a reported movement of the peptide to the cell nucleus under metabolic stress, where it is associated with changes in gene expression.
Is MOTS-c the same as Humanin?
No. Both are mitochondrial-derived peptides, but Humanin comes from a different region (16S rRNA) and is longer. They are studied separately.
What purity data should accompany a research lot?
At minimum an HPLC chromatogram with the lot number, and ideally identity confirmation and contaminant screening. See the testing guides linked below.
How should lyophilized MOTS-c be stored?
General practice for lyophilized peptides is cold, dry and protected from light until use. See the dedicated storage article for details.
Does V8 Peptides sell MOTS-c?
Yes, as a laboratory research product. It is sold for research use only, not for human or animal use.
Where do I read more?
The V8 library has a full MOTS-c cluster covering structure, history, mechanism, preclinical work, purity testing and a research FAQ.
References
- Lee C, Zeng J, Drew BG, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metabolism. 2015;21(3):443-454.
- Kim KH, Son JM, Benayoun BA, Lee C. The mitochondrial-encoded peptide MOTS-c translocates to the nucleus to regulate nuclear gene expression in response to metabolic stress. Cell Metabolism. 2018;28(3):516-524.
- Lee C, Yen K, Cohen P. Humanin: a harbinger of mitochondrial-derived peptides? Trends in Endocrinology and Metabolism. 2013;24(5):222-228.
For laboratory research use only. Not for human or animal consumption. Not a drug, food, or cosmetic.