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MOTS-c vs SS-31: Research Comparison (2026)

By the Banger Labs Research Team · Updated June 2026

MOTS-c vs SS-31 research peptides

Short answer: MOTS-c is a 16-amino-acid mitochondrial-derived peptide studied in preclinical research as a regulator of cellular energy metabolism and metabolic homeostasis. This material is offered strictly for research use only and is not for human or veterinary use, diagnosis, or treatment. SS-31 (also designated elamipretide; research/development names MTP-131 and Bendavia) is a synthetic cell-permeable tetrapeptide studied in laboratory and preclinical research as a mitochondria-targeting compound reported to associate with the inner mitochondrial membrane phospholipid cardiolipin. It is provided strictly for research use only and is not characterized here for any human, diagnostic, or therapeutic application. They are compared below by class, mechanism, and research context.

MOTS-c vs SS-31 at a glance

Attribute MOTS-c SS-31
Class Mitochondrial-derived peptide (16-amino-acid mitochondrial-encoded peptide) Synthetic mitochondria-targeted aromatic-cationic tetrapeptide
Primary research area Studied in research models of cellular energy metabolism and AMPK signaling Studied in cell-culture and preclinical models of mitochondrial bioenergetics and inner-membrane (cardiolipin) biology
Purity standard ≥ 99% HPLC ≥ 99% HPLC
Use Research use only Research use only
MOTS-c — research illustration

What is MOTS-c?

MOTS-c (Mitochondrial Open reading frame of the Twelve S rRNA type-c) is a small peptide of 16 amino acids encoded by a short open reading frame within the mitochondrial 12S rRNA gene region, first described in the scientific literature in 2015. It belongs to the family of mitochondrial-derived peptides (MDPs). It is presented here solely as a research chemical for laboratory investigation, with no approved human use.

SS-31 — research illustration

What is SS-31?

SS-31 is a synthetic aromatic-cationic tetrapeptide with the sequence D-Arg-Dmt-Lys-Phe-NH2, where Dmt denotes the non-standard residue 2′,6′-dimethyltyrosine. It belongs to the Szeto-Schiller (SS) peptide class developed in academic research, carries a net positive charge at physiological pH, and is structurally distinct from incretin/GLP peptides. It is referenced in the literature under the names elamipretide, MTP-131, and Bendavia.

MOTS-c research setting

How they differ

In preclinical and cell-based research, MOTS-c is reported to act primarily through the folate-AICAR-AMPK axis: it is associated with inhibition of the folate cycle and de novo purine biosynthesis, leading to AICAR accumulation and activation of AMP-activated protein kinase (AMPK). Research models also describe MOTS-c translocating from the mitochondria to the nucleus under metabolic stress, where it has been studied in relation to stress-responsive and antioxidant (e.g., Nrf2-associated) gene expression. These are research-context mechanisms only and do not constitute therapeutic claims. By contrast, In preclinical and cell-based research, SS-31 has been reported to cross the plasma membrane in an energy-independent manner and to accumulate at the inner mitochondrial membrane, where electrostatic and structural interactions with the anionic phospholipid cardiolipin have been described. Research models report associated observations on inner-membrane surface electrostatics, cristae architecture, and the organization of cardiolipin-dependent membrane components. These mechanistic observations are derived from in vitro and animal model systems and do not constitute claims of clinical effect.

SS-31 research setting

These describe laboratory/preclinical research only. No therapeutic, medical, or efficacy claims are made.

Frequently asked questions

Are MOTS-c and SS-31 the same?

No — see the comparison table above; they differ in class and the research contexts in which they are studied.

Are these research use only?

Yes. Both are supplied strictly for laboratory research — not for human or veterinary use.

References

  1. The Mitochondrial-Derived Peptide MOTS-c Promotes Metabolic Homeostasis and Reduces Obesity and Insulin Resistance — Cell Metabolism (Lee et al., 2015; PubMed PMID 25738459)
  2. Mitochondria-derived peptide MOTS-c: effects and mechanisms related to stress, metabolism and aging — Journal of Translational Medicine, 2023 (PMC9854231)
  3. The Mitochondrial-Derived Peptide MOTS-c Alleviates Radiation Pneumonitis via an Nrf2-Dependent Mechanism — PMC11117534
  4. Mitochondrial-Encoded Peptide MOTS-c, Diabetes, and Aging-Related Diseases — Diabetes & Metabolism Journal, 2023; 47(3):315-324
  5. Elamipretide: A Review of Its Structure, Mechanism of Action, and Therapeutic Potential — International Journal of Molecular Sciences (2025), via PMC
  6. The mitochondria-targeted peptide SS-31 binds lipid bilayers and modulates surface electrostatics as a key component of its mechanism of action — Journal of Biological Chemistry (2020), via PMC
  7. The mitochondrially targeted peptide elamipretide (SS-31) affects ADP sensitivity in aged mitochondria by increasing uptake through the adenine nucleotide translocator (ANT) — GeroScience (2023), via PubMed
  8. SS-31 treatment ameliorates cardiac mitochondrial morphology and defective mitophagy in a murine model of Barth syndrome — Scientific Reports (2024), via PMC

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By the Banger Labs Research Team. For research use only. Not for human or veterinary use. Educational information, not medical advice.