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Research / MOTS-c peptide review
Reference review

MOTS-c peptide: a mitochondrial-derived peptide and its published research

Null Bio Lab Research Desk · Last reviewed October 18, 2026 · Research use only

Scope. This article summarises published laboratory literature for readers working with MOTS-c as a research reagent. It gives no dosing, administration or usage guidance, and nothing here is a statement about any use in humans or animals. MOTS-c is not an authorised medicine in the EU or US.
Key facts
  • Sequence: Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg (MRWQEMGYIFYPRKLR)
  • Origin: encoded by a short open reading frame within the mitochondrial 12S rRNA gene
  • Monoisotopic mass: 2173.11 Da; [M+H]+ ≈ 2174.12
  • Evidence base: mouse models, human samples and cell culture
  • Status: research reagent; no regulator has authorised it as a medicine

What MOTS-c is

MOTS-c (mitochondrial open reading frame of the twelve S rRNA, type-c) is a 16-amino-acid peptide. It belongs to the small group of mitochondrial-derived peptides, which are encoded in mitochondrial DNA rather than in the nucleus. That origin is the reason it attracts attention: it was described as a signal that mitochondria themselves could send to the rest of the cell and the body.1

Metabolic studies

The 2015 Cell Metabolism paper that introduced the peptide reported that, in mice, MOTS-c treatment prevented diet-induced obesity and insulin resistance, and linked the effect to skeletal-muscle metabolism and AMPK activity.1 It remains the primary reference for the metabolic phenotype. Replication across independent laboratories, and the translation of mouse results to other species, are open questions.

Exercise and muscle

A later Nature Communications paper reported that endogenous MOTS-c levels rise with exercise, and examined its relationship with age-related physical decline and muscle homeostasis in mice.2 For a researcher the practical lesson is that the endogenous peptide is part of a physiological response and that measured levels vary by tissue and context.

Cell-culture work

In vitro, MOTS-c has been tested on cultured cell types. One study reported that it promoted homeostasis in aged human placenta-derived mesenchymal stem cells.3 Cell-culture experiments are the closest match to how a reagent-grade peptide is used on the bench, but they lack the whole-body context of the mouse studies above.

Limits of the evidence

  • The foundational phenotype comes from mouse work; the peptide is young in research terms (first described in 2015).
  • A 16-residue peptide with two methionines is prone to oxidation, so sample handling affects what is actually being tested.
  • Reported signalling routes (AMPK, folate and methionine cycle) are mechanistic proposals that continue to be refined.

Regulatory status

To our knowledge MOTS-c is not an authorised medicine in the EU or US. Regulatory positions change, so confirm the current status with the relevant authority. Null Bio Lab supplies MOTS-c strictly as a laboratory research reagent.

Verifying a batch

Look for HPLC purity, a measured mass close to 2174.12 [M+H]+ (higher charge states such as [M+2H]2+ near 1087.6 are common for a peptide with several basic residues), measured quantity, and a matching batch number. Two methionines mean +16 and +32 Da oxidation peaks are worth looking for. See how to read a peptide COA. Reagent page: NB-MOTS-c.

Frequently asked questions

What does MOTS-c stand for?

Mitochondrial open reading frame of the twelve S rRNA, type-c.

What is a mitochondrial-derived peptide?

A small peptide encoded within mitochondrial DNA instead of nuclear DNA. MOTS-c is the best known example in the metabolism literature.

How long is MOTS-c?

16 amino acids, with a monoisotopic mass of 2173.11 Da.

Is MOTS-c approved for any use?

No. To our knowledge it is not an authorised medicine in the EU or US.

References

  1. Lee C, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metabolism. 2015;21. doi:10.1016/j.cmet.2015.02.009.
  2. Reynolds JC, et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nature Communications. 2021;12. doi:10.1038/s41467-020-20790-0.
  3. Yu WD, et al. The mitochondrial-derived peptide MOTS-c promotes homeostasis in aged human placenta-derived mesenchymal stem cells in vitro. Mitochondrion. 2021;58. doi:10.1016/j.mito.2021.02.010.

Related reading

For newly published papers on this and other peptides, see the live feed on the Research Desk.