MOTS-c is a 16-amino-acid mitochondrial-derived peptide at the forefront of metabolic and cellular homeostasis investigations. Research institutions utilize high-purity synthesized MOTS-c to evaluate nuclear-mitochondrial communication, glucose uptake mechanisms, and exercise-capacity pathways in controlled laboratory settings.
MOTS-c is a 16-amino-acid mitochondrial-derived peptide at the forefront of metabolic and cellular homeostasis investigations. Research institutions utilize high-purity synthesized MOTS-c to evaluate nuclear-mitochondrial communication, glucose uptake mechanisms, and exercise-capacity pathways in controlled laboratory settings.
MOTS-c laboratory research focuses on a novel 16-amino-acid mitochondrial-derived peptide (MDP) encoded within the 12S ribosomal RNA gene of the mitochondrial genome. Preclinical evidence indicates that MOTS-c acts as a signaling hormone that translocates to the nucleus during metabolic stress to regulate nuclear gene expression, cellular energy balance, and systemic metabolic flexibility.
Unlike classic nuclear-encoded peptides, MOTS-c demonstrates a unique capacity for retrotranslocation between cellular organelles. Laboratory assays aim to map its biochemical pathways, particularly its activation of AMP-activated protein kinase (AMPK) and its impact on glucose utilization in muscle and adipose tissue models.
MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA Type-c) possesses the primary sequence Met-Met-Ser-Gln-Glu-Leu-Phe-Gln-Arg-Phe-Thr-Val-Glu-Gly-Val-Gly. It is derived from a short open reading frame (sORF) within the mitochondrial DNA (mtDNA), challenging the traditional paradigm that mitochondrial genomes solely encode 13 core oxidative phosphorylation proteins and structural RNAs.
In vitro assays reveal that MOTS-c exhibits unique structural stability under physiological pH, though it remains sensitive to oxidative modification. Researchers investigating mitochondrial genetics use synthesized MOTS-c to study non-canonical mitochondrial signaling pathways. Accessing pure reference standards, such as those cataloged in our research peptide directory, allows investigators to maintain strict analytical fidelity when profiling small mitochondrial peptides via liquid chromatography-mass spectrometry (LC-MS).
The principal signaling cascade characterized in MOTS-c laboratory research involves the activation of the central energy sensor, AMP-activated protein kinase (AMPK). In preclinical cell culture models, administration of exogenous MOTS-c leads to rapid phosphorylation of AMPK at Thr172. This event triggers downstream inhibition of acetyl-CoA carboxylase (ACC) and upregulation of glucose transporter 4 (GLUT4) translocation to the plasma membrane.
Under cellular stress conditions—such as nutrient restriction or oxidative exposure—MOTS-c rapidly translocates from the cytoplasm to the cell nucleus. Once inside the nucleus, MOTS-c interacts directly with transcription factors like heat shock factor 1 (HSF1) and nuclear factor erythroid 2-related factor 2 (Nrf2). This nuclear intervention drives the expression of adaptive stress-response genes and antioxidant defense enzymes, demonstrating a retro-signaling axis from the mitochondrion to the nucleus.
A central focus of preclinical MOTS-c research is its influence on systemic metabolic flexibility and skeletal muscle performance. In rodent models, researchers observe that MOTS-c administration significantly enhances insulin sensitivity and blunts high-fat diet-induced metabolic dysfunction. Assays measuring cellular respiration demonstrate elevated oxygen consumption rates (OCR) and altered extracellular acidification rates (ECAR) following peptide treatment.
Furthermore, animal studies suggest that MOTS-c functions as an exercise mimetic. In forced-swim and treadmill exertion models using aged mice, MOTS-c treatment restored physical capacity and enhanced fatty acid oxidation in skeletal muscle. These findings prompt ongoing research into how MDPs modulate mitochondrial biogenesis, exercise adaptation, and lipid metabolism. Laboratories focused on metabolic pathways frequently source target peptides like high-purity MOTS-c to evaluate these energetic transitions in controlled assays.
To contextualize MOTS-c within mitochondrial biology, investigators often evaluate it alongside other mitochondrial-active compounds. While MOTS-c primarily targets metabolic homeostasis and nuclear gene transcription via AMPK activation, Humanin functions primarily as a cytoprotective mitochondrial-derived peptide that binds cell-surface receptors and inhibits apoptosis via Bax inactivation.
In contrast, synthetic mitochondrial-targeted tetrapeptides such as SS-31 selectively bind cardiolipin in the inner mitochondrial membrane, optimizing electron transport chain efficiency independently of genomic transcription pathways. Evaluating these complementary mechanisms across parallel experimental arms provides a comprehensive map of mitochondrial stress adaptation, as outlined in our mitochondrial research literature hub.
Achieving reproducible experimental results with MOTS-c requires strict adherence to handling and reconstitution guidelines. Synthesized as a lyophilized trifluoroacetate (TFA) salt, MOTS-c should be stored at -20°C or -80°C upon receipt to maintain peptide integrity. Prior to reconstitution, vials must be brought to room temperature in a desiccator to prevent condensation moisture from causing hydrolytic degradation.
For cell culture assays, MOTS-c is readily solubilized in sterile bacteriostatic water or sterile physiological saline. For hydrophobic assays or high-concentration stock solutions, initial dissolution in dimethyl sulfoxide (DMSO) up to 10% volume, followed by dilution in buffer, may be required. Aliquoting reconstituted solutions into single-use microcentrifuge tubes minimizes freeze-thaw cycles, which degrade the peptide chain. For detailed research execution guidelines across high-throughput projects, laboratories rely on wholesale account services to maintain batch consistency.
Data integrity in peptide research depends strictly on compound purity and chemical identity. Substandard peptide preparations containing truncated sequence impurities or high endotoxin levels introduce unquantifiable variables into cellular assays and animal studies. PX1 Research enforces rigorous analytical quality control standards for every production lot.
Every batch of MOTS-c undergoes Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) to verify chemical purity exceeding 98.0%, combined with Electrospray Ionization Mass Spectrometry (ESI-MS) to confirm exact molecular weight. Crucially, given that MOTS-c is frequently evaluated in metabolic signaling and inflammatory pathway assays, all lots undergo chromogenic Limulus Amebocyte Lysate (LAL) testing to confirm endotoxin levels fall below strict thresholds (<0.01 EU/mg).
Procuring research compounds from verified domestic suppliers ensures consistent lot-to-lot bioactivity and eliminates regulatory import bottlenecks. PX1 Research manufactures and packages peptides within United States facilities adhering to GMP-compliant procedures and ISO 17025 testing standards.
Every MOTS-c shipment includes a lot-specific Certificate of Analysis (COA) documenting raw chromatographic data, mass spectra, moisture content, and endotoxin metrics. Orders are fulfilled directly from state-of-the-art facilities in California and Arizona, offering same-day dispatch for orders placed Monday through Friday to support continuous research operations across academic, biotechnology, and institutional laboratories.
What is the sequence and molecular weight of MOTS-c?
MOTS-c is a 16-amino-acid peptide with the sequence Met-Met-Ser-Gln-Glu-Leu-Phe-Gln-Arg-Phe-Thr-Val-Glu-Gly-Val-Gly and an approximate molecular weight of 2174.6 g/mol.
How does MOTS-c differ from Humanin?
Both are mitochondrial-derived peptides (MDPs), but MOTS-c is encoded within the 12S rRNA gene and acts predominantly on AMPK pathways and nuclear translocation for metabolic regulation. Humanin is encoded in the 16S rRNA gene and primarily prevents cell death by targeting Bax and extracellular receptors.
What solvent is recommended for reconstituting MOTS-c in vitro?
Sterile bacteriostatic water or phosphate-buffered saline (PBS) is suitable for most aqueous applications. For high-concentration stock solutions, a minimal amount of DMSO can be used prior to buffer aqueous dilution.
Why is endotoxin testing critical for MOTS-c research?
Endotoxins (lipopolysaccharides) alter inflammatory cytokine expression and metabolic pathways in cell cultures and rodent models. Unchecked endotoxin contamination invalidates metabolic and exercise-capacity research data.
What storage conditions maintain MOTS-c peptide stability?
Lyophilized MOTS-c should be stored desiccated at -20°C or -80°C. Once reconstituted, stock solutions should be aliquoted and kept at -80°C, avoiding repeated freeze-thaw cycles.
What purity level is required for published preclinical research?
Peer-reviewed literature generally requires reference peptides to demonstrate ≥98% purity verified via RP-HPLC and MS to ensure observed biological activity is attributable strictly to the target peptide.
How does MOTS-c enter the nucleus during cellular stress?
Under conditions of metabolic or oxidative stress, MOTS-c accumulates in the cytoplasm and undergoes nuclear translocation dependent on its interaction with specific transport mechanisms, where it binds HSF1 and Nrf2 response elements.
Does PX1 Research provide lot-specific COAs with MOTS-c orders?
Yes. Every shipment of MOTS-c from PX1 Research includes a lot-specific Certificate of Analysis detailing RP-HPLC purity, mass spectrometry sequence confirmation, and LAL endotoxin testing data.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.