What is MOTS-c peptide?
5 min read · Updated August 2026 · MY PEPTIDES Research Team
Key facts
MOTS-c is a 16-amino-acid peptide encoded within the 12S rRNA region of mitochondrial DNA rather than in the nuclear genome — one of a small group known as mitochondrial-derived peptides. That origin is what makes it interesting: it is direct evidence that mitochondria encode signalling molecules of their own, rather than only receiving instructions from the nucleus. Laboratory research uses it to study mitochondrial-to-nuclear communication, cellular energy sensing and metabolic regulation, with experimental systems commonly assessing AMPK activation, metabolic gene expression and stress-responsive signalling. It is frequently studied alongside NAD+, since both sit in the same metabolic-research workflows. Findings vary with concentration, exposure time and model system, and cell-culture results do not transfer directly to whole organisms. MY PEPTIDES supplies MOTS-c as a pre-mixed solution with a batch Certificate of Analysis, refrigerated at 2–8°C. Supplied strictly for in-vitro laboratory research — not for human or veterinary use, and carrying no therapeutic claims.
MOTS-c is a 16-amino-acid peptide with an unusual origin: it is encoded within the 12S rRNA region of mitochondrial DNA, not in the nuclear genome. It belongs to a small group known as mitochondrial-derived peptides (MDPs), and that origin is the reason it attracts research attention.
Research use only. This page describes what MOTS-c is and what published laboratory research examines. It does not describe dosing or administration, is not guidance for use in humans or animals, and makes no therapeutic claims.
Why the origin matters
Almost every protein in a human cell is encoded by nuclear DNA. Mitochondria carry their own small genome — a legacy of their evolutionary origin as free-living bacteria — but it was long assumed to encode only the components mitochondria need for their own respiratory machinery.
Mitochondrial-derived peptides complicate that picture. MOTS-c is encoded by mitochondrial DNA and appears to act outside the mitochondrion, including on nuclear gene expression. That makes it evidence of signalling running in the opposite direction from the textbook arrangement: not nucleus instructing mitochondria, but mitochondria signalling to the rest of the cell.
For a researcher, that is the appeal. MOTS-c is a tool for studying mitochondrial-to-nuclear communication — a comparatively young area, and one where a defined synthetic peptide is far more tractable than trying to observe endogenous signalling directly.
What the research examines
Published laboratory work concentrates on three connected areas:
- Energy sensing — particularly AMPK activation. AMPK is the cell's principal energy sensor, responding to the ratio of AMP to ATP, and it is the pathway most consistently examined in MOTS-c studies.
- Metabolic gene regulation — changes in the expression of genes involved in glucose and lipid handling, in cultured cells.
- Stress-responsive signalling — how the peptide behaves in models where cells are placed under metabolic or oxidative stress.
As with all in-vitro literature, results depend heavily on concentration, exposure duration and the model system. Cell-culture observations do not translate directly to whole organisms, and the field is exploratory rather than settled.
MOTS-c and NAD+
MOTS-c is frequently studied in the same workflows as NAD+, and the reason is mechanistic rather than incidental. NAD⁺ is the central redox cofactor in cellular metabolism and a substrate for the sirtuins; AMPK and the NAD⁺/sirtuin axis are interconnected energy-sensing systems. A laboratory investigating cellular energy regulation will often have reason to look at both.
They are chemically unrelated, though — NAD⁺ is a dinucleotide, not a peptide at all. Our NAD+ guide sets out that distinction.
How it is supplied
MOTS-c is supplied as a pre-mixed solution with a batch-specific Certificate of Analysis recording identity and purity by HPLC. Store refrigerated at 2–8°C.
For working out the concentration of a vial, use the peptide calculator.
MOTS-c
Available now from MY PEPTIDES — 99%+ purity, COA with every order, fast UK dispatch.
Frequently asked questions
- What is MOTS-c peptide?
- MOTS-c is a 16-amino-acid mitochondrial-derived peptide, encoded within the 12S rRNA region of mitochondrial DNA rather than in the nuclear genome. Laboratory research uses it to study mitochondrial-to-nuclear signalling, cellular energy sensing and metabolic regulation. Supplied for in-vitro research use only.
- What does MOTS-c stand for?
- Mitochondrial Open reading frame of the Twelve S rRNA type-c. The name describes where in the mitochondrial genome the sequence is found — the 12S ribosomal RNA region.
- What makes a mitochondrial-derived peptide different?
- Almost all cellular proteins are encoded by nuclear DNA. Mitochondrial-derived peptides are encoded by the mitochondrion's own small genome and appear to act outside it, including on nuclear gene expression — signalling that runs from the mitochondria outward rather than the other way round.
- Why is MOTS-c studied alongside NAD+?
- Both sit in cellular energy metabolism. AMPK — the pathway most examined in MOTS-c research — and the NAD⁺/sirtuin axis are interconnected energy-sensing systems, so a laboratory studying metabolic regulation often has reason to look at both. They are chemically unrelated: NAD⁺ is a dinucleotide, not a peptide.
- How should MOTS-c be stored?
- Refrigerated at 2–8°C. We supply it as a pre-mixed solution rather than a lyophilised powder, so no reconstitution step is required.