SS-31 Research Overview

What Is SS-31?

SS-31 is a synthetic mitochondria-targeted tetrapeptide studied in mitochondrial membrane biology, cardiolipin interactions, membrane electrostatics, oxidative phosphorylation, and cellular bioenergetics. It is also known in the scientific literature as Elamipretide and MTP-131, and belongs to the Szeto-Schiller peptide family.

Its amino acid sequence is D-Arg-Dmt-Lys-Phe-NH₂, where Dmt represents 2,6-dimethyltyrosine. Unlike many research peptides that primarily interact with extracellular receptors, SS-31 has been studied for its association with the inner mitochondrial membrane, making it a distinct research tool for investigating mitochondrial structure and function.

AminoForge offers SS-31 research peptide (Elamipretide) for laboratory research use only.

SS-31 Research Identity

SS-31 and the Inner Mitochondrial Membrane

Mitochondria contain an outer membrane and a highly specialized inner mitochondrial membrane. The inner membrane contains the protein complexes responsible for oxidative phosphorylation and forms the folded structures known as mitochondrial cristae.

A central component of this membrane is cardiolipin, an anionic phospholipid strongly associated with mitochondrial membrane architecture and the organization of proteins involved in cellular energy metabolism.

Published biophysical research has shown that SS-31 partitions into membrane interfaces and interacts strongly with negatively charged lipid environments. Research using model and mitochondrial membranes has also reported that SS-31 can alter membrane surface electrostatics and lipid packing without disrupting the underlying bilayer structure.

These observations have expanded the scientific model of SS-31 beyond the older idea that it functions simply as a conventional antioxidant. Current mitochondrial research instead examines how peptide-membrane interactions may influence the physical and biochemical environment of the inner mitochondrial membrane.

Cardiolipin Research

Cardiolipin is concentrated in the inner mitochondrial membrane and participates in the organization of respiratory-chain proteins, cristae architecture, and interactions involving cytochrome c.

SS-31 has been studied extensively because of its association with cardiolipin-containing membranes. Experimental work has examined electrostatic and hydrophobic interactions between SS-31 and cardiolipin, as well as downstream changes in membrane organization and mitochondrial protein behavior.

Earlier mechanistic research proposed that SS-31-cardiolipin interactions may influence the functional relationship between cardiolipin and cytochrome c. More recent biophysical work has added membrane surface charge, lipid packing, ion distribution, and cardiolipin-dependent protein organization to the research framework.

Mitochondrial Bioenergetics Research

The mitochondrial electron transport chain establishes the electrochemical gradient used by ATP synthase during oxidative phosphorylation. Because these systems are embedded within the inner mitochondrial membrane, changes in membrane organization can be studied alongside changes in mitochondrial energy metabolism.

Laboratory studies involving SS-31 have therefore examined research endpoints including:

• mitochondrial oxygen-consumption measurements
• oxidative phosphorylation and respiratory-chain activity
• ATP-linked bioenergetic measurements
• mitochondrial membrane potential
• reactive oxygen species signaling
• cristae and inner-membrane ultrastructure
• cardiolipin-dependent protein interactions
• cellular responses to experimentally induced mitochondrial stress

These are laboratory research endpoints used to investigate mitochondrial mechanisms. Findings from cell-culture, isolated-mitochondria, animal, or other experimental models do not establish a use, benefit, or outcome in humans or animals.

SS-31 Protein Interaction Research

Research has also examined whether SS-31 interacts with mitochondrial proteins in addition to membrane lipids.

A chemical cross-linking and mass-spectrometry study identified multiple mitochondrial proteins associated with SS-31. Many of the identified proteins were already known to interact with cardiolipin and were involved in oxidative phosphorylation or mitochondrial metabolic processes.

This work supports a broader research model in which SS-31 may influence a membrane-associated network involving cardiolipin, mitochondrial proteins, and the physical properties of the inner mitochondrial membrane rather than acting through a single conventional receptor.

SS-31, Elamipretide, MTP-131, and Bendavia

The names SS-31, Elamipretide, MTP-131, and Bendavia appear throughout the scientific literature and generally refer to the same core tetrapeptide research compound.

“SS-31” is widely used in basic and preclinical mitochondrial research literature, while “Elamipretide” became the recognized drug name during pharmaceutical development. MTP-131 and Bendavia appear frequently in earlier publications and development literature.

This naming history is useful when searching scientific databases because relevant SS-31 mitochondrial research may be indexed under any of these terms.

Regulatory Distinction: Elamipretide and Forzinity

In September 2025, the U.S. Food and Drug Administration granted accelerated approval to a prescription drug product containing elamipretide under the trade name Forzinity for a specific approved indication.

AminoForge SS-31 is not Forzinity and is not the FDA-approved drug product. AminoForge supplies SS-31 solely as a laboratory research material. The existence of an approved pharmaceutical product containing elamipretide does not change the research-only status or intended use of AminoForge material.

SS-31 in Mitochondrial Research

SS-31 occupies a different mechanistic position from many other compounds used in mitochondrial research. Rather than being primarily studied as a receptor agonist or metabolic substrate, SS-31 research centers on the physical and biochemical environment of the inner mitochondrial membrane.

Researchers examining mitochondrial biology may also encounter related but mechanistically distinct compounds within the AminoForge catalog.

• MOTS-C is a mitochondrial-derived peptide studied in connection with AMPK signaling and cellular energy-metabolism pathways.
• NAD+ is a dinucleotide coenzyme central to redox reactions and cellular energy metabolism.
• Epitalon is a short peptide bioregulator studied through a substantially different research framework involving gene-expression biology.

For broader context on mitochondrial biology within aging research, see the AminoForge Longevity Research Guide.

Published SS-31 Research

The following publications and databases provide useful starting points for SS-31 and Elamipretide research:

• Mitchell et al.: SS-31 binding to lipid bilayers and modulation of mitochondrial membrane surface electrostatics
• Szeto: Cardiolipin interactions and mitochondrial bioenergetics research involving SS-31
• Chavez et al.: Mitochondrial protein interaction landscape of SS-31
• Contemporary review: Elamipretide mitochondrial mechanism-of-action research
• PubChem: Elamipretide chemical identity and database record

SS-31 Research Material from AminoForge

View SS-31 research peptide (Elamipretide) for laboratory research use only. AminoForge provides batch-specific analytical documentation for research compounds through its COA and Purity resources.

For Research Use Only. Not for use in diagnostic, therapeutic, cosmetic, or human or animal in-vivo procedures. AminoForge SS-31 is supplied exclusively as a laboratory research material. It is not Forzinity and is not offered as an FDA-approved drug product. Not intended to diagnose, treat, cure, mitigate, or prevent any disease. Not for human or animal consumption.