MOTS-C 10mg,
Mitochondrial-Derived Peptide
A 16-Residue Signal Encoded Within Mitochondrial 12S rRNA
Introduction
A 16-Residue Signal Encoded Within Mitochondrial 12S rRNA
MOTS-c (Mitochondrial Open Reading Frame of the Twelve S rRNA-c) is a 16-residue peptide encoded by a short open reading frame within the mitochondrial 12S rRNA gene. Its discovery established the existence of mitochondrial-encoded peptide messengers, now called mitokines, and opened a new field of mitochondrial-nuclear signalling research.
The discovery of MOTS-c by Lee, Cohen, and colleagues (Cell Metabolism, 2015) represented a paradigm shift in mitochondrial biology. Until that point, mitochondria were understood as essentially energy-converting organelles whose communication with the nucleus operated through retrograde signalling via reactive oxygen species, metabolite levels, and other small-molecule messengers. The identification of MOTS-c, a peptide encoded directly by the mitochondrial genome and acting as an endocrine signalling molecule, established mitochondria as active peptide-producing endocrine organs.
MOTS-c's 16-residue sequence (Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg) is encoded by a small open reading frame within the mitochondrial 12S rRNA gene, a region that had been understood primarily as a structural component of the mitochondrial ribosome. The discovery that this region also encodes a functional peptide messenger opened a new field of research into mitochondrial sORF-encoded peptides, with several additional mitokines (including humanin, SHLPs, and MOTS-c-related sequences) subsequently identified.
Functionally, MOTS-c activates AMP-activated protein kinase (AMPK) signalling and modulates folate-cycle metabolism, glucose homeostasis, and skeletal muscle bioenergetics in cellular research models. Subsequent work has characterised the peptide's translocation to the nucleus under metabolic stress conditions and its role in exercise-induced metabolic adaptation.
Molecular Architecture
Encoded Within the Mitochondrial 12S rRNA Gene
MOTS-c is unique among research peptides in that its sequence is encoded directly by the mitochondrial genome rather than by nuclear DNA. This places MOTS-c in a newly recognised class of mitochondrial-encoded peptide messengers, the mitokines, that signal between mitochondria, the nucleus, and other organelles.
The mitochondrial 12S rRNA gene encodes the small subunit ribosomal RNA component of the mitochondrial ribosome. Within this gene, a small open reading frame (sORF) encodes the 16-residue MOTS-c peptide. The sORF is translated using the mitochondrial genetic code, which differs slightly from the standard nuclear code (notably, AUA codes for methionine rather than isoleucine in mitochondria). MOTS-c was the first sORF-encoded mitochondrial peptide to be characterised as a functional endocrine signalling molecule, but it is now understood to be part of a broader class that includes humanin and the SHLP family.
Functionally, MOTS-c engages multiple cellular pathways. Its principal characterised activity is activation of AMP-activated protein kinase (AMPK), a master regulator of cellular energy homeostasis that responds to elevated AMP/ATP ratios by promoting catabolic energy-generating pathways and inhibiting anabolic energy-consuming pathways. MOTS-c's AMPK-activating activity makes it functionally similar to exercise-induced AMPK signalling, an analogy that subsequent research has explored in detail.
Beyond AMPK activation, MOTS-c has been characterised as a regulator of folate-cycle metabolism, glucose homeostasis, and skeletal muscle bioenergetics. Kim and colleagues (Cell Metab, 2018) documented MOTS-c translocation to the nucleus under metabolic stress conditions and its role in regulating nuclear gene expression, a direct demonstration of mitochondrial-nuclear signalling by a mitochondrially-encoded peptide. Reynolds and colleagues (Nat Commun, 2021) characterised MOTS-c as an exercise-induced regulator of muscle homeostasis.
Research Applications
Mitokine Biology and AMPK Pathway Research
MOTS-c is used as a research tool in mitokine biology, AMPK pathway activation studies, and mitochondrial-nuclear signalling research. Its applications span cellular metabolism, exercise biology, skeletal muscle research, and aging biology.
In AMPK pathway research, MOTS-c serves as a peptide-class AMPK activator alongside small-molecule activators including metformin and AICAR. Comparative studies use MOTS-c to dissect the AMPK-mediated component of cellular metabolic adaptation from other parallel pathways. Published work has characterised MOTS-c effects on AMPK phosphorylation, downstream ACC and SREBP regulation, and integrated metabolic gene expression changes.
Mitokine biology research uses MOTS-c as the founding reference compound for the broader class of mitochondrial-encoded peptide messengers. Comparative work with humanin (the first-discovered mitokine, encoded within the 16S rRNA gene) and the SHLP family helps characterise how different mitokines engage distinct cellular pathways and how the broader mitokine system contributes to integrated cellular signalling.
Skeletal muscle research uses MOTS-c to characterise effects on muscle bioenergetics, exercise-induced metabolic adaptation, and muscle homeostasis with aging. Reynolds and colleagues' 2021 Nat Commun publication characterised MOTS-c as an exercise-induced regulator of muscle function, opening a research thread on mitokine-mediated exercise biology that continues to expand. Aging biology research uses MOTS-c as a tool to probe how mitokine signalling contributes to cellular and organismal aging processes.
Research Overview
Understanding MOTS-c
MOTS-c (Mitochondrial Open Reading Frame of the Twelve S rRNA-c) is a 16-residue peptide encoded by a short open reading frame within the mitochondrial 12S rRNA gene. Its discovery by Lee, Cohen, and colleagues (Cell Metabolism, 2015) established the existence of mitochondrial-encoded peptide messengers, now called mitokines, and opened a new field of research into mitochondrial-nuclear signalling and integrated cellular metabolism.
The discovery of MOTS-c represented a paradigm shift in mitochondrial biology. Until 2015, mitochondria were understood as essentially energy-converting organelles whose communication with the nucleus operated through retrograde signalling via reactive oxygen species, metabolite levels, NAD/NADH ratios, and other small-molecule messengers. The identification of MOTS-c, a peptide encoded directly by the mitochondrial genome, processed by mitochondrial machinery, and acting as an endocrine signalling molecule that can translocate to the nucleus, established mitochondria as active peptide-producing endocrine organs.
Structurally, MOTS-c's 16-residue sequence is encoded within a small open reading frame in the mitochondrial 12S rRNA gene, a region that had been understood primarily as a structural component of the mitochondrial ribosome. The discovery that this region also encodes a functional peptide messenger opened research into a broader class of mitochondrial-encoded peptides, with humanin (16S rRNA-encoded) and the SHLP (small humanin-like peptide) family subsequently characterised as additional mitokines.
Functionally, MOTS-c's principal characterised activity is activation of AMP-activated protein kinase (AMPK), a master regulator of cellular energy homeostasis. AMPK responds to elevated AMP/ATP ratios by promoting catabolic energy-generating pathways (glycolysis, fatty acid oxidation, glucose uptake) and inhibiting anabolic energy-consuming pathways (gluconeogenesis, fatty acid synthesis, protein synthesis). MOTS-c's AMPK-activating activity makes it functionally similar to exercise-induced AMPK signalling, an analogy that subsequent research has explored in detail.
Beyond AMPK activation, MOTS-c has been characterised as a regulator of folate-cycle metabolism, a critical pathway for one-carbon transfer reactions involved in nucleotide synthesis, methylation reactions, and amino acid metabolism. Cell-based studies have documented MOTS-c effects on folate-cycle enzyme expression, methionine metabolism, and downstream SAM/SAH ratios. Glucose homeostasis research has characterised effects on insulin signalling, GLUT4 translocation, and glucose uptake in skeletal muscle preparations.
Kim and colleagues (Cell Metab, 2018) provided a landmark publication characterising MOTS-c translocation to the nucleus under metabolic stress conditions. The peptide accumulates in the cytoplasm under basal conditions but translocates to the nucleus when cells encounter metabolic stress (glucose deprivation, oxidative stress, AMPK activation), where it regulates nuclear gene expression, a direct demonstration of mitochondrial-nuclear signalling by a mitochondrially-encoded peptide. This finding established MOTS-c not only as an extracellular signalling molecule but as an intracellular nuclear regulator.
Skeletal muscle and exercise biology research has been a particularly active application area. Reynolds and colleagues (Nat Commun, 2021) characterised MOTS-c as an exercise-induced regulator of muscle homeostasis, documenting that circulating MOTS-c levels increase with exercise and that MOTS-c administration mimics aspects of exercise-induced muscle adaptation in pre-clinical research models. This finding has opened a research thread on mitokine-mediated exercise biology that continues to expand. Aging biology research uses MOTS-c as a tool to probe how mitokine signalling contributes to cellular and organismal aging processes, and emerging metabolic research uses MOTS-c as a reference compound in studies of mitochondrial-nuclear communication in metabolic disease research models.
Selected Literature
Peer-reviewed publications cited in this overview
- [1] Lee C, Zeng J, Drew BG, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metab. 2015;21(3):443-454.
- [2] 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 Metab. 2018;28(3):516-524.e7.
- [3] Reynolds JC, Lai RW, Woodhead JST, et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nat Commun. 2021;12(1):470.
- [4] Yen K, Lee C, Mehta H, Cohen P. The emerging role of the mitochondrial-derived peptide humanin in stress resistance. J Mol Endocrinol. 2013;50(1):R11-R19.
- [5] Merry TL, Chan A, Woodhead JST, et al. Mitochondrial-derived peptides in energy metabolism. Am J Physiol Endocrinol Metab. 2020;319(4):E659-E666.
Kenji T. –
MOTS-C from Anglo is excellent. Ships fast, quality is solid. Came well packaged and the powder reconstituted perfectly. Will keep coming back for this.
Alicia R. –
Hard to find MOTS-C at this quality in Canada. Arrived two days after ordering, reconstituted clean. Really glad I found Anglo for this.
Daniel A. –
MOTS-C is hard to find in Canada at this quality level. Anglo Peptides manufactures it domestically and the Janoshik COA confirms 99%+ purity. Will always reorder from here.
Jade L. –
Dissolved perfectly and the documentation is excellent. Love the Canadian-made angle, no import risks. Fast Xpresspost to London, Ontario. Very happy customer.
Cole H. –
Solid MOTS-C, good COA, fast shipping to Edmonton. Quality seems consistent with my previous order. Would bump to 5 stars if they added a 20mg option.