What is MOTS-C? A Researcher's Guide to the Mitochondrial-Derived Peptide

MOTS-C (Mitochondrial Open Reading Frame of the 12S rRNA-c) is a mitochondrial-derived peptide (MDP) encoded within the mitochondrial genome. It is one of a small class of peptides discovered to be encoded by mitochondrial DNA rather than nuclear DNA, and has attracted significant research interest for its roles in metabolic regulation, insulin sensitivity, and exercise physiology.

What is MOTS-C?

MOTS-C is a 16-amino acid peptide encoded by a short open reading frame within the 12S ribosomal RNA gene of the mitochondrial genome. It was first identified by researchers at the University of Southern California in 2015 and represents a novel class of signalling molecules that originate from mitochondria and act on nuclear gene expression.

MOTS-C levels decline with age and are influenced by exercise, metabolic state, and mitochondrial function, making it a subject of interest in both ageing research and exercise physiology.

Mechanism of Action

MOTS-C exerts its effects through several interconnected mechanisms:

• AMPK activation — MOTS-C activates AMP-activated protein kinase (AMPK), a master regulator of cellular energy homeostasis, promoting glucose uptake and fatty acid oxidation
• Folate cycle and methionine metabolism — MOTS-C inhibits the folate cycle, leading to AICAR accumulation, which activates AMPK independently of AMP levels
• Nuclear translocation — under stress conditions, MOTS-C translocates to the nucleus where it regulates adaptive nuclear gene expression
• Insulin sensitisation — preclinical studies demonstrate MOTS-C improves insulin sensitivity in skeletal muscle, independent of body weight changes

Why MOTS-C is of Research Interest

As a mitochondrial-derived signalling peptide, MOTS-C represents a novel communication axis between mitochondria and the rest of the cell. Key research areas include:

• Insulin resistance and type 2 diabetes models
• Exercise physiology and physical performance research
• Metabolic ageing and longevity biology
• Obesity and adipose tissue metabolism
• Mitochondrial signalling and retrograde communication
• Skeletal muscle metabolism and sarcopenia

Sourcing MOTS-C for Research

Research-grade MOTS-C should be sourced from suppliers providing batch-specific Certificates of Analysis (CoA) confirming purity (>98%), identity, and potency. Lyophilised formats offer optimal stability for laboratory storage.

At Aura Peptides, our MOTS-C is supplied as a research-grade lyophilised peptide with full CoA documentation, available as single vials or in 10x bulk packs for high-volume research programmes.

For research purposes only. Not intended for human or veterinary use.