SS-31 (Elamipretide)

SS-31 (Elamipretide, MTP-131, Bendavia) is a cell-permeable, mitochondria-targeted tetrapeptide designed using the Szeto-Schiller motif: alternating aromatic and cationic amino acids that enable selective concentration in the inner mitochondrial membrane. This targeting allows SS-31 to directly interact with cardiolipin, a phospholipid essential for electron transport chain function.

The interaction between SS-31 and cardiolipin stabilizes cristae structure, optimizes electron transfer between respiratory complexes, and reduces electron leak that generates reactive oxygen species. By improving mitochondrial efficiency rather than simply scavenging ROS, SS-31 addresses mitochondrial dysfunction at its source.

Research has demonstrated SS-31's efficacy in multiple models of mitochondrial dysfunction, including cardiac ischemia-reperfusion injury, heart failure, age-related organ decline, and primary mitochondrial diseases. The compound improves ATP production, reduces oxidative stress, and preserves organ function in these diverse contexts.

Clinical development has focused on conditions involving mitochondrial dysfunction, including heart failure with preserved ejection fraction, primary mitochondrial myopathy (Barth syndrome), and age-related macular degeneration. SS-31 represents a promising approach to targeting the fundamental role of mitochondria in aging and disease.