MOTS-c: The Mitochondrial Peptide and Exercise Research

What is MOTS-c?

MOTS-c (Mitochondrial ORF of the 12S rRNA Type-C) is a 16-amino-acid peptide encoded within a small open reading frame of the 12S rRNA mitochondrial gene — making it one of the small but growing class of mitochondrial-derived peptides discovered in the past two decades. With a molecular weight of 2174.5 Da, MOTS-c is supplied at 99%+ HPLC-verified purity for research applications including AMPK pathway pharmacology and exercise-mimetic signalling research. Researchers can access MOTS-c research peptide at Advanced Peptide Science.

Research Background: Mitochondrial-Derived Peptides

The discovery of mitochondrial-derived peptides represented a significant extension of mitochondrial biology research. Traditionally, mitochondrial DNA was understood to encode only 37 genes — 13 proteins of the electron transport chain plus the structural rRNAs and tRNAs required for mitochondrial translation. The identification of additional small open reading frames within the rRNA genes encoding bioactive peptides expanded this framework. MOTS-c was among the first such peptides discovered, alongside Humanin (encoded within the 16S rRNA gene). Both compounds are stocked at Advanced Peptide Science within the Longevity & Immune Support category.

Mechanism of Action

Mechanism research investigates MOTS-c activation of AMPK (AMP-activated protein kinase) in skeletal muscle and other metabolically active tissues. AMPK is a master cellular energy sensor — activated under conditions of low ATP availability — that drives compensatory metabolic responses including enhanced glucose uptake, mitochondrial biogenesis, and reduced anabolic energy expenditure. Critically, MOTS-c also translocates from the mitochondrion to the nucleus under metabolic stress, where it influences nuclear gene expression patterns. This nuclear translocation is an example of mitochondrial-to-nuclear retrograde signalling — a research-tool framework for investigating how mitochondrial state regulates nuclear transcriptional responses.

Key Research Findings

AMPK Pathway Activation

AMPK is a heterotrimeric serine/threonine protein kinase activated by elevated AMP/ATP ratio. MOTS-c research investigates AMPK activation independent of direct AMP/ATP ratio changes, suggesting MOTS-c provides a regulatory input separate from direct cellular energy charge sensing. Downstream AMPK effects include enhanced glucose uptake via GLUT4 translocation, mitochondrial biogenesis via PGC-1α coactivator pathway, and reduced anabolic energy expenditure.

Nuclear Translocation Under Stress

Under conditions of metabolic stress (low nutrient availability, exercise, oxidative challenge), MOTS-c translocates from the mitochondrion to the nucleus. In the nucleus, MOTS-c is investigated for direct effects on transcriptional regulators including binding to chromatin and modulation of gene expression patterns — a mitochondrial-to-nuclear retrograde signalling mechanism distinct from conventional nuclear signal transduction.

Exercise-Mimetic Transcriptional Adaptations

The gene expression patterns induced by MOTS-c overlap with those induced by exercise training — making MOTS-c a research tool for investigating exercise-mimetic transcriptional adaptations. Research applications include metabolic flexibility studies, insulin sensitivity pathway research, and skeletal muscle adaptation investigation.

Research Applications and Comparison

MOTS-c is cross-categorised in both Longevity & Immune Support and Growth Hormone & Performance categories reflecting its dual research applications in ageing/metabolic and exercise/performance research lineages. Comparative research with Humanin (the other mitochondrial-derived peptide in the catalogue, focused on BAX-dependent apoptosis inhibition and neuronal survival) and with SS-31 (mitochondrial-targeted cardiolipin-binding peptide, focused on inner-membrane structure and electron transport chain function) provides a comprehensive mitochondrial biology research framework.

Research Specifications

Molecular Weight	2174.5 Da
Sequence	16-amino-acid mitochondrial-derived peptide
Encoding	12S rRNA mitochondrial gene (small open reading frame)
Primary Mechanism	AMPK pathway activation + mitochondrial-to-nuclear retrograde signalling
Format	Lyophilized powder in sterile vial
Purity	≥ 99% (HPLC verified)
Storage	-20 °C, protect from light

Frequently Asked Questions

What does MOTS-c stand for?

MOTS-c stands for Mitochondrial ORF (Open Reading Frame) of the 12S rRNA Type-C. The naming reflects the compound’s origin as a peptide encoded within a small open reading frame in the mitochondrial 12S rRNA gene.

Why is MOTS-c described as exercise-mimetic?

The gene expression patterns induced by MOTS-c overlap substantially with those induced by exercise training. This makes MOTS-c a research tool for investigating which exercise-induced transcriptional adaptations can be reproduced pharmacologically vs requiring the broader physiological signal of exercise itself.

How does MOTS-c compare to Humanin?

Both are mitochondrial-derived peptides. MOTS-c (16 amino acids, 2174.5 Da, 12S rRNA-encoded) focuses on AMPK activation and metabolic flexibility. Humanin (21 amino acids, 2702.1 Da, 16S rRNA-encoded) focuses on BAX-dependent apoptosis inhibition and neuronal survival.

Is MOTS-c approved for human use?

Advanced Peptide Science supplies MOTS-c exclusively for in vitro and in vivo scientific research. Not for human consumption. Research use only.

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For Research Use Only. Not for human consumption. Not intended to diagnose, treat, cure, or prevent any disease.