Research guide · Published July 22, 2026 · Sources checked July 22, 2026
MOTS-c vs SS-31: two different mitochondrial research peptides
MOTS-c and SS-31 are both discussed in mitochondrial research, but their origins, sequences, and experimental mechanisms are fundamentally different.
Short answer
MOTS-c is a 16-amino-acid peptide encoded within mitochondrial 12S rRNA and studied in metabolic and stress-signaling models. SS-31 is a synthetic aromatic-cationic tetrapeptide studied for interactions with mitochondrial membranes and cardiolipin. Evidence for either one does not establish a combined effect.
Evidence boundary: The cited literature does not validate a combination, establish interchangeability, or provide human-use guidance. Catalog materials are supplied only for qualified in vitro laboratory research and are not for human or animal use.
Comparison at a glance
| Research dimension | MOTS-c | SS-31 |
|---|---|---|
| Origin | Mitochondrial-genome-encoded peptide | Synthetic Szeto–Schiller tetrapeptide |
| Selected mechanism studied | Metabolic stress signaling, AMPK-associated pathways, nuclear translocation | Membrane partitioning, cardiolipin-associated bioenergetics, surface electrostatics |
| Representative models | Cells, mice, small human exercise observations | Biophysical systems, isolated mitochondria, cells, selected human mechanistic studies |
| Combination evidence | No cited study here establishes a MOTS-c/SS-31 combination | No cited study here establishes a MOTS-c/SS-31 combination |
How to interpret the comparison
Sharing the word ‘mitochondrial’ does not imply the same target. MOTS-c research emphasizes a signaling peptide encoded by mitochondrial DNA; SS-31 research emphasizes a designed peptide's interaction with mitochondrial membrane environments.
Independent findings from different models cannot be added together to predict synergy. A combination requires its own controlled study.
Primary sources
- Lee et al., Cell Metabolism (2015) — Identification of MOTS-c and initial cell and mouse metabolic experiments. DOI: 10.1016/j.cmet.2015.02.009
- Kim et al., Cell Metabolism (2018) — Cell research on stress-associated MOTS-c nuclear translocation and gene regulation. DOI: 10.1016/j.cmet.2018.06.008
- Mitchell et al., Journal of Biological Chemistry (2020) — Biophysical and computational study of SS-31 interactions with model and mitochondrial membranes. DOI: 10.1074/jbc.RA119.012094
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Prepared by The Pep Labs Research Editorial Team. This evidence summary is not medical advice and contains no dosing or administration guidance.