SS-31 and Cardiolipin-Targeted Mitochondrial Research
Tetrapeptide that selectively binds inner-membrane cardiolipin to stabilize the electron transport chain.
- 1Concentrates >1,000-fold in the inner mitochondrial membrane.
- 2Binds cardiolipin and stabilizes electron-transport-chain supercomplexes.
- 3Restores ATP output and reduces ROS in stressed mitochondria.
- 4Mechanism is membrane stabilization, not free-radical scavenging.
A Mitochondria-Targeted Peptide
SS-31 (elamipretide) is a cell-permeable aromatic-cationic tetrapeptide that concentrates >1,000-fold in the inner mitochondrial membrane. Unlike antioxidants that scavenge ROS after the fact, SS-31 binds cardiolipin — the signature phospholipid of the inner membrane — and stabilizes the architecture of the electron transport chain.
Cardiolipin Binding and ETC Efficiency
By preserving cardiolipin–cytochrome c interactions, SS-31 maintains supercomplex assembly and reduces electron leak. Cell and tissue models show restored ATP production, lower mitochondrial ROS output, and preserved membrane potential under ischemic, aging, and heart-failure stress.
Translational Research
SS-31 has been studied in clinical trials for primary mitochondrial myopathy, heart failure with reduced ejection fraction, and dry age-related macular degeneration. Outcomes vary, but the mechanistic story — direct membrane stabilization rather than indirect antioxidant action — remains the most distinctive feature in the literature.