What Is SS-31 Peptide (Elamipretide)?
SS-31, also known as Elamipretide or MTP-131, is a synthetic, water-soluble aromatic-cationic tetrapeptide that has drawn considerable attention in mitochondrial biology research. Its sequence (D-Arg-2’,6’-dimethyltyrosine-Lys-Phe-NH2) gives it an alternating aromatic-cationic structure that allows it to concentrate within the inner mitochondrial membrane independent of membrane potential.
Researchers investigate SS-31 primarily because of its selective association with cardiolipin, a phospholipid unique to the inner mitochondrial membrane that plays a central role in organizing the electron transport chain. Because mitochondrial dysfunction is a recurring theme across many preclinical models of aging, metabolic stress, and tissue injury, SS-31 has become a widely referenced tool compound for probing how stabilizing mitochondrial architecture influences cellular energetics.
In laboratory settings, SS-31 is studied to explore questions about bioenergetic efficiency, reactive oxygen species handling, and mitochondrial membrane integrity. It is important to note that all discussion here reflects in vitro and preclinical research contexts only; SS-31 supplied for research is not intended for human or animal consumption.
Recommended Products
Mechanisms Researchers Explore With SS-31
The core mechanistic interest in SS-31 centers on its interaction with cardiolipin. In research models, SS-31 is described as binding selectively to cardiolipin within the inner mitochondrial membrane, where it appears to help maintain the curvature of the cristae and the proper assembly of electron transport chain supercomplexes.
Investigators explore several downstream questions that follow from this interaction:
- Electron transport efficiency: studies examine whether stabilizing cardiolipin-cytochrome c interactions influences the efficiency of oxidative phosphorylation and ATP output in isolated mitochondria.
- Reactive oxygen species (ROS): preclinical research suggests SS-31 may reduce electron leak, and researchers investigate its effect on mitochondrial ROS generation under stress conditions.
- Peroxidase activity: cardiolipin binding by SS-31 is studied in the context of limiting the peroxidase activity of the cytochrome c-cardiolipin complex, a step implicated in apoptotic signaling models.
- Membrane potential and swelling: researchers assess mitochondrial membrane potential and permeability transition in tissue and cell models exposed to metabolic stress.
Because these pathways intersect with broader redox biology, SS-31 is frequently studied alongside other mitochondrial and antioxidant research compounds such as MOTS-c and cellular energy cofactors like NAD+. Comparative studies help researchers distinguish membrane-targeted effects from those driven by signaling peptides or metabolic cofactors.
Research Handling, Storage, and Purity Considerations
SS-31 is typically supplied as a lyophilized (freeze-dried) powder to maximize stability during shipping and storage. For research use, the lyophilized vial is generally kept refrigerated, and many laboratories store unopened vials frozen for longer-term stability. Once reconstituted, peptide solutions are handled with attention to temperature and sterility.
For reconstitution in research protocols, investigators commonly use bacteriostatic water or sterile water, adding the diluent slowly against the vial wall rather than directly onto the powder. Reconstituted solutions are refrigerated and used within a limited window, and researchers aim to minimize freeze-thaw cycles, since repeated freezing and thawing can degrade peptide integrity.
Purity is a central quality signal for reproducible research. Amino Labs supplies SS-31 at 99%+ HPLC purity, third-party tested and lyophilized, with Canadian-owned fulfillment and shipping across Canada via Purolator. Researchers can compare related mitochondrial and antioxidant tools such as Glutathione when designing redox-focused study panels. Consistent purity, documented handling, and careful reconstitution all contribute to cleaner, more interpretable experimental data.