· For research use only. Not for human consumption.
For research use only. Not for human consumption.
If you’ve encountered SS-31 elamipretide in research literature, you might wonder: are these the same thing? The answer is yes — SS-31 and Elamipretide are two names for the same peptide. Understanding this dual naming and what makes this molecule special is essential for anyone working in mitochondrial research.
This guide covers what SS-31 is, how it targets mitochondria, and what published research has found — all in plain language.
For a comparison with another mitochondrial peptide, see our SS-31 vs MOTS-c guide.
TL;DR: SS-31 elamipretide is a synthetic tetrapeptide (four amino acids: D-Arg-Dmt-Lys-Phe-NH2) designed to penetrate cell membranes and accumulate in the inner mitochondrial membrane. Mitchell et al. (2020) characterized its lipid bilayer interactions (PMID: 32273339), while Pharaoh et al. (2023) examined its effects on mitochondrial ADP sensitivity (PMID: 37462785). For research use only. Not for human consumption.
SS-31 Elamipretide: Why Two Names?
This peptide was originally called SS-31 — the 31st compound in a series called “Szeto-Schiller” peptides, named after the researchers who developed the series (Hazel Szeto and Peter Bhatt-Schiller). The “SS” stands for Szeto-Schiller.
Later, when the peptide moved into more formal pharmaceutical research, it was given the generic drug name “Elamipretide.” Same molecule, different naming context. In research literature, both names are used interchangeably.
The sequence is: D-Arg-Dmt-Lys-Phe-NH2
Notice something unusual? It uses D-Arg (a “mirror image” amino acid) and Dmt (a modified tyrosine). These modifications are deliberate — they help the peptide resist degradation and maintain its ability to target mitochondria.
How SS-31 Targets Mitochondria
What makes SS-31 elamipretide remarkable is its ability to go exactly where it’s needed. Most molecules can’t easily cross the multiple membrane barriers that protect mitochondria. SS-31 can.
Here’s how it works:
- Cell membrane crossing — SS-31’s combination of positive charge (from arginine and lysine) and hydrophobicity (from Dmt and phenylalanine) allows it to penetrate the outer cell membrane.
- Cytoplasm transit — The peptide passes through the cell’s interior fluid.
- Outer mitochondrial membrane crossing — SS-31 penetrates the first of mitochondria’s two membranes.
- Inner mitochondrial membrane binding — This is the destination. SS-31 concentrates in the inner membrane, where the energy-production machinery is located.
Think of it as a submarine that can navigate through multiple locks in a canal to reach a specific dock deep inside a harbor.
Mitchell et al. (2020) demonstrated that SS-31 binds to mitochondrial lipid bilayers and modulates surface electrostatics, characterizing this membrane interaction as a key component of its mechanism of action. (PMID: 32273339)
What SS-31 Does at the Inner Mitochondrial Membrane
Once SS-31 reaches the inner mitochondrial membrane, it interacts with a phospholipid called cardiolipin. Cardiolipin is unique to mitochondrial membranes — it’s not found anywhere else in the cell. It plays a critical role in organizing the electron transport chain — the assembly line that produces ATP.
When cardiolipin is damaged or disorganized, energy production becomes less efficient. Published research suggests that SS-31’s interaction with cardiolipin may help stabilize these membrane structures.
Pharaoh et al. (2023) showed that SS-31 improves ADP sensitivity in aged mitochondria, suggesting a mechanism involving improved function of the adenine nucleotide translocator at the inner mitochondrial membrane. (PMID: 37462785)
Current Research Landscape
SS-31 elamipretide has been studied across multiple research contexts, including:
- Mitochondrial membrane biology — Understanding how cardiolipin organization affects energy production
- Oxidative stress research — Examining how mitochondrial-targeted peptides influence reactive oxygen species
- Aging biology — Investigating changes in mitochondrial function over time
- Cardiac research — Studying mitochondrial function in heart tissue models
A 2024 review by Du et al. provided a comprehensive overview of SS-31’s research applications across multiple preclinical models.
Du et al. (2024) reviewed the application of SS-31 in mitigating mitochondrial dysfunction across various preclinical research models, summarizing current knowledge and future research directions. (PMID: 38237649)
Alpha Peptides offers research-grade SS-31 with batch-specific COAs. For a complementary mitochondrial peptide, see our MOTS-c.
Frequently Asked Questions
Is SS-31 the same as Elamipretide?
Yes. SS-31 elamipretide are two names for the same peptide. SS-31 is the research designation; Elamipretide is the pharmaceutical generic name.
How does SS-31 reach mitochondria?
SS-31’s chemical properties — positive charge and hydrophobicity — allow it to cross cell membranes and accumulate specifically in the inner mitochondrial membrane where it interacts with cardiolipin.
Is SS-31 natural or synthetic?
SS-31 is entirely synthetic. It was designed in a laboratory, unlike MOTS-c which is encoded by mitochondrial DNA. SS-31 contains modified amino acids (D-Arg and Dmt) not found in natural proteins.
Is SS-31 approved for medical use?
No. SS-31/Elamipretide is a research compound. While it has been studied in some clinical research contexts, it is not FDA-approved for any medical condition.
For research use only. Not for human consumption. This article is intended for informational purposes and does not constitute medical advice, dosing guidance, or therapeutic recommendations.
