SS-31 vs Other Szeto-Schiller Peptides: Key Differences for Mitochondrial Research
Research Notice: This article covers research on SS-31 research peptide and MOTS-C research peptide — available from Palmetto Peptides for laboratory use only.
Research Disclaimer: All Szeto-Schiller peptides are sold by Palmetto Peptides as research compounds for in vitro and laboratory use only.
SS-31 became the most widely studied member of the Szeto-Schiller peptide family due to its superior cardiolipin binding and mitochondrial targeting in laboratory models. Researchers can source SS-31 research peptide from Palmetto Peptides with full analytical documentation.
Structural Comparison: SS-31 vs SS-02, SS-20, SS-09
| Peptide | Sequence | Net Charge | Position 2 Aromatic |
|---|---|---|---|
| SS-02 | D-Arg-Tyr-Lys-Phe-NH2 | +3 | Tyrosine (Tyr) |
| SS-31 | D-Arg-Dmt-Lys-Phe-NH2 | +3 | Dmt |
| SS-20 | Phe-D-Arg-Phe-Lys-NH2 | +2 | Phe |
| SS-09 | D-Arg-Dmt-Lys-Trp-NH2 | +3 | Dmt + Trp at pos 4 |
SS-31 vs SS-02: The Dmt Advantage
SS-02 differs only at position 2 (Tyr vs Dmt). SS-31 Dmt provides higher membrane affinity, greater metabolic stability due to steric blocking of enzymatic access, and stronger cardiolipin affinity in laboratory models.
SS-31 vs SS-20: Charge, Sequence, and Aromatic Identity
SS-20 has lower net charge (+2 vs +3), lacks Dmt, and has different residue ordering — resulting in weaker electrostatic driving force for mitochondrial accumulation in cell-based systems and different membrane interaction properties.
Why SS-31 Is the Research Standard
SS-31 combination of +3 charge, Dmt-enhanced cardiolipin affinity, and metabolic stability made it the most experimentally productive family member, appearing in hundreds of peer-reviewed publications and multiple clinical trials (as elamipretide). See also: MOTS-C mitochondrial research, NAD+ research, longevity peptide research, mitochondrial function research. Order SS-31 here.
Frequently Asked Questions
What is the difference between SS-31 and SS-20?
SS-20 carries net charge +2 vs +3, lacks Dmt, and has different residue ordering. SS-31 shows stronger cardiolipin binding in laboratory models.
Which Szeto-Schiller peptide is most studied?
SS-31 appears in hundreds of peer-reviewed publications and multiple clinical trials.
See Also: SS-31 Research Peptide: Complete Guide