SS-31 (Elamipretide) is a synthetic mitochondria-targeted tetrapeptide widely investigated in preclinical bioenergetic research. This technical guide outlines the molecular characteristics, binding affinity, storage parameters, and comparative mechanisms of SS-31 for laboratory evaluation.
SS-31 (Elamipretide) is a synthetic mitochondria-targeted tetrapeptide widely investigated in preclinical bioenergetic research. This technical guide outlines the molecular characteristics, binding affinity, storage parameters, and comparative mechanisms of SS-31 for laboratory evaluation.
SS-31, also known as Elamipretide or Szeto-Schiller 31, is a synthetic tetrapeptide (D-Arg-Dmt-Lys-Phe-NH2) specifically designed to target the inner mitochondrial membrane (IMM). In preclinical laboratory models, SS-31 selectively binds to cardiolipin, an essential phospholipid critical for maintaining mitochondrial structural integrity and optimizing electron transport chain efficiency.
Researchers investigate SS-31 research compounds to analyze cellular bioenergetics, reduction of reactive oxygen species (ROS), protection against ischemia-reperfusion injury, and restoration of ATP production without disrupting physiological cell signalling pathways.
The molecular structure of SS-31 incorporates alternating aromatic and basic amino acid residues. This specific spatial arrangement allows the peptide to cross the outer mitochondrial membrane without relying on energy-dependent transporters or membrane potential. Once inside the intermembrane space, SS-31 interacts electrostatically and hydrophobically with cardiolipin.
Cardiolipin is primarily concentrated within the inner mitochondrial membrane, where it stabilizes the electron transport chain (ETC) supercomplexes (I, III, and IV). Preclinical in vitro assays demonstrate that when cardiolipin undergoes peroxidation under conditions of oxidative stress, mitochondrial cristae structures collapse. By binding cardiolipin, SS-31 prevents its oxidation, thereby preserving membrane curvature, minimizing cytochrome c release, and preventing the initiation of apoptotic cascades.
To explore detailed structural pathways and receptor interaction models, laboratory teams can reference our comprehensive overview of ss-31 mechanism of action within the broader PX1 research library.
Mitochondrial dysfunction is frequently characterized by electron leakage from Complexes I and III, leading to hyper-production of superoxide radicals and secondary intracellular damage. Research evaluating SS-31 indicates that its association with cardiolipin enhances electron transfer efficiency across the mitochondrial electron transport chain.
In cell culture and isolated mitochondria assays, administration of SS-31 results in a measurable reduction of ROS generation without compromising basal respiration. By restoring optimal distance between electron carriers, SS-31 promotes efficient proton pumping across the inner membrane, directly supporting elevated adenosine triphosphate (ATP) synthesis rates during oxidative phosphorylation.
These bioenergetic findings make SS-31 a valuable tool for investigating metabolic disorders, cardiorenal pathology, neurodegenerative processes, and cellular senescence models.
When designing preclinical protocols focused on cellular energy maintenance and organelle restoration, investigators often evaluate several distinct peptide classes. A side-by-side comparison helps clarify which targets best align with specific hypothesis testing:
While SS-31 acts directly on membrane structure and lipid stabilization at the inner mitochondrial membrane, mitochondrial-derived peptides like MOTS-c function primarily as metabolic signaling agents that regulate nuclear gene expression and systemic insulin sensitivity. Concurrently, telomere-associated regulators such as Epithalon operate via distinct genomic pathways to influence cellular aging markers.
Comparing these distinct mechanisms allows research teams to choose between localized organelle stabilization via SS-31 or upstream metabolic transcription regulation using mitochondrial-derived signaling vectors. You can review all available organelle-targeted compounds across our complete catalog of all peptides.
To ensure precise, reproducible, and unconfounded experimental data, research laboratories must strictly verify the quality and purity parameters of acquired peptide lots. Variations in peptide synthesis, residual trifluoroacetic acid (TFA), or bacterial endotoxin contamination can skew metabolic assays and cell viability readouts.
Every research batch supplied by PX1 Research undergoes rigorous testing to satisfy demanding analytical criteria:
• Purity Verification: Every lot achieves ≥98% purity verified through Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC). • Molecular Identity: Mass Spectrometry (MS) analysis confirms exact peptide mass and sequence structure. • Endotoxin Testing: Quantitative LAL assays ensure endotoxin levels remain strictly below <0.01 EU/mg, protecting delicate cell culture models. • USA Manufacturing & Traceability: Manufactured in GMP-compliant, ISO 17025 accredited facilities with verifiable lot traceability. • Fast Dispatch: Standard order processing provides same-day shipping (Monday–Friday) from our dual CA and AZ distribution centers.
SS-31 is supplied as a lyophilized (freeze-dried) powder to maximize chemical stability during transport and storage. Proper reconstitution technique is vital to preserve peptide stability and ensure uniform concentration for experimental assays.
For most cell culture and biochemical protocols, lyophilized SS-31 should be reconstituted using sterile, bacteriostatic water or sterile phosphate-buffered saline (PBS, pH 7.4). Avoid high-shear vortexing; gently swirl or invert the vial until the lyophilized cake is completely dissolved.
Detailed step-by-step preparation guidelines, concentration calculations, and solvent compatibility matrices are detailed in our dedicated peptide reconstitution guide.
Lyophilized SS-31 powder should be stored in a dry, dark environment at -20°C for short-term preservation or -80°C for long-term storage. Under these conditions, unopened lyophilized vials maintain chemical integrity for up to 24 months.
Following reconstitution, liquid aliquots should be divided into single-use working volumes to minimize freeze-thaw cycles, which induce mechanical peptide degradation. Reconstituted solutions are stable at 2°C to 8°C for up to 7–14 days, or at -80°C for up to 6 months. Exposure to direct light and elevated temperature must be minimized.
In literature, SS-31 has been investigated across a spectrum of organ-system models to determine its capacity to mitigate oxidative stress and restore cellular functionality:
1. Ischemia-Reperfusion Injury: Murine and isolated tissue models demonstrate reduced microvascular damage and microvascular reflow restoration following ischemic insults. 2. Cardiorenal Pathology: Rodent studies demonstrate attenuation of tubulointerstitial fibrosis and protection of podocyte architecture under diabetic and hypertensive conditions. 3. Neurodegenerative Models: In vitro neuronal cell cultures subjected to amyloid or oxidative challenge show enhanced survival and preserved synaptic spine density following SS-31 incubation. 4. Skeletal Muscle Senescence: Aged animal models exhibit improved muscle force production and reduced mitochondrial ROS production after targeted administration.
In complex disease models, investigators often design combination protocols to evaluate potential synergistic pathways. Combining SS-31 with complementary tissue repair compounds or metabolic modulators offers broad experimental flexibility.
For instance, researchers studying tissue recovery models after ischemic damage may pair the mitochondrial structural protection of SS-31 with tissue-repair signaling peptides. The KLOW blend product represents one such multi-target research formulation utilized in preclinical recovery models.
For larger laboratories and academic institutions conducting high-throughput screening, custom quantities and multi-compound orders can be coordinated via our dedicated wholesale program.
What is ss31?
SS-31 (Elamipretide) is a synthetic tetrapeptide (D-Arg-Dmt-Lys-Phe-NH2) designed for laboratory research. It specifically targets and binds cardiolipin within the inner mitochondrial membrane to protect organelle structure, improve ATP synthesis, and reduce reactive oxygen species (ROS) in preclinical models.
What is the target receptor or molecule for SS-31 in laboratory models?
SS-31 does not target classical cell-surface G-protein coupled receptors. Instead, it selectively binds to cardiolipin, a unique phospholipid concentrated exclusively in the inner mitochondrial membrane.
How is SS-31 purity verified at PX1 Research?
Every lot of SS-31 undergoes Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) to verify ≥98% purity and Mass Spectrometry (MS) to confirm exact molecular weight. Lot-specific Certificates of Analysis (COAs) are published for full transparency.
What is the endotoxin limit for PX1 Research SS-31?
PX1 Research subjects all peptide batches to quantitative LAL testing to ensure endotoxin levels remain strictly below <0.01 EU/mg, making them suitable for sensitive cell culture and in vitro models.
How should lyophilized SS-31 be stored upon delivery?
Lyophilized SS-31 should be stored at -20°C or -80°C in a dry, dark location. Stored at -80°C, unopened vials remain stable for up to 24 months.
What solvents are recommended for reconstituting SS-31 in vitro?
SS-31 readily dissolves in sterile bacteriostatic water, sterile normal saline, or sterile phosphate-buffered saline (PBS, pH 7.4) depending on cell culture assay requirements.
How long is reconstituted SS-31 stable in liquid solution?
Reconstituted SS-31 solutions remain stable for 7 to 14 days when kept refrigerated at 2°C–8°C. For long-term liquid storage, aliquots should be frozen at -80°C to avoid repeated freeze-thaw degradation.
What is the difference between SS-31 and MOTS-c?
SS-31 is a synthetic tetrapeptide that directly stabilizes inner mitochondrial membrane lipid structures (cardiolipin). MOTS-c is a mitochondrial-derived peptide that functions primarily as a metabolic signaling molecule acting on nuclear gene expression.
Where is PX1 Research SS-31 manufactured and shipped from?
All PX1 Research peptides are manufactured in US-based, ISO 17025 accredited and GMP-compliant facilities. Orders are dispatched same-day (Monday through Friday) from our fulfillment centers in California and Arizona.
Is SS-31 approved for human consumption or therapeutic use?
No. SS-31 provided by PX1 Research is strictly sold as a research compound intended exclusively for laboratory, in vitro, and preclinical research applications. It is not for human or veterinary use.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.