How SS-31 (Elamipretide) Protects Mitochondria by Modifying Membrane Electrostatics
SS-31 integrates into mitochondrial membranes and modulates surface charge, reducing calcium stress — revealing the biophysical mechanism behind its protective effects.
Quick Facts
What This Study Found
SS-31 partitions into the mitochondrial membrane interface and modulates surface electrostatics in a charge-dependent manner, with demonstrated reduction of calcium stress as a proof-of-concept protective mechanism.
Key Numbers
Binding proportional to surface charge; no bilayer destabilization; altered lipid packing; reduced calcium stress in mitochondria
How They Did This
Biophysical and computational study using model lipid bilayers and mitochondrial membranes to characterize SS-31 binding, membrane effects, and calcium distribution.
Why This Research Matters
Understanding exactly how SS-31 interacts with mitochondrial membranes enables rational design of improved variants — critical since elamipretide is already in clinical trials for mitochondrial diseases.
The Bigger Picture
This mechanistic work bridges the gap between SS-31's observed clinical benefits and its molecular actions, providing a framework for designing next-generation mitochondria-targeted peptides.
What This Study Doesn't Tell Us
In-vitro study using model membranes; in-vivo membrane conditions are more complex; calcium modulation shown as proof of concept but not fully characterized in living cells.
Questions This Raises
- ?Can this electrostatic modulation mechanism be optimized to create more potent SS-31 variants?
- ?How does SS-31 membrane interaction change in diseased mitochondria with altered cardiolipin composition?
- ?Does the surface charge mechanism explain SS-31 efficacy across its diverse therapeutic applications?
Trust & Context
- Key Stat:
- Surface charge modulation SS-31 binds mitochondrial membranes proportionally to negative charge and reduces calcium stress at the interface
- Evidence Grade:
- Rigorous biophysical characterization with complementary computational and experimental approaches, but limited to model membranes and in-vitro mitochondria.
- Study Age:
- Published in 2020; elamipretide continues in clinical trials for Barth syndrome and other mitochondrial conditions.
- Original Title:
- The mitochondria-targeted peptide SS-31 binds lipid bilayers and modulates surface electrostatics as a key component of its mechanism of action.
- Published In:
- The Journal of biological chemistry, 295(21), 7452-7469 (2020)
- Authors:
- Mitchell, Wayne(2), Ng, Emily A, Tamucci, Jeffrey D(2), Boyd, Kevin J, Sathappa, Murugappan, Coscia, Adrian, Pan, Meixia, Han, Xianlin, Eddy, Nicholas A, May, Eric R, Szeto, Hazel H, Alder, Nathan N
- Database ID:
- RPEP-05003
Evidence Hierarchy
Frequently Asked Questions
How does SS-31 (elamipretide) protect mitochondria?
SS-31 embeds in mitochondrial membranes and modifies their surface electrical charge, which redistributes calcium ions and reduces calcium stress — a key factor in mitochondrial dysfunction.
What is elamipretide used for?
Elamipretide (SS-31) is being tested in clinical trials for mitochondrial diseases like Barth syndrome, heart failure, and age-related conditions involving mitochondrial dysfunction.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-05003APA
Mitchell, Wayne; Ng, Emily A; Tamucci, Jeffrey D; Boyd, Kevin J; Sathappa, Murugappan; Coscia, Adrian; Pan, Meixia; Han, Xianlin; Eddy, Nicholas A; May, Eric R; Szeto, Hazel H; Alder, Nathan N. (2020). The mitochondria-targeted peptide SS-31 binds lipid bilayers and modulates surface electrostatics as a key component of its mechanism of action.. The Journal of biological chemistry, 295(21), 7452-7469. https://doi.org/10.1074/jbc.RA119.012094
MLA
Mitchell, Wayne, et al. "The mitochondria-targeted peptide SS-31 binds lipid bilayers and modulates surface electrostatics as a key component of its mechanism of action.." The Journal of biological chemistry, 2020. https://doi.org/10.1074/jbc.RA119.012094
RethinkPeptides
RethinkPeptides Research Database. "The mitochondria-targeted peptide SS-31 binds lipid bilayers..." RPEP-05003. Retrieved from https://rethinkpeptides.com/research/mitchell-2020-the-mitochondriatargeted-peptide-ss31
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.